CN105375435B - Electricity and the Self-power protective device and system of tripping are taken based on three-phase current sensing - Google Patents
Electricity and the Self-power protective device and system of tripping are taken based on three-phase current sensing Download PDFInfo
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- CN105375435B CN105375435B CN201510860340.6A CN201510860340A CN105375435B CN 105375435 B CN105375435 B CN 105375435B CN 201510860340 A CN201510860340 A CN 201510860340A CN 105375435 B CN105375435 B CN 105375435B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for three-phase systems
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Abstract
Present invention offer is a kind of to take the Self-power protective device of electricity and tripping and system, the Self-power protective device to include based on three-phase current sensing：Three phase rectifier and controlling circuit of voltage regulation, Switching Power Supply isolation circuit, thread off tripping control circuit and CPU, the three phase rectifier and controlling circuit of voltage regulation are connected by Switching Power Supply isolation circuit with the CPU, the three phase rectifier and controlling circuit of voltage regulation are connected with the tripping control circuit of threading off, and the tripping control circuit of threading off is connected with the CPU；Wherein, the three phase rectifier and controlling circuit of voltage regulation adjust its PWM frequency and duty ratio by adjusting RC oscillating circuits parameter, can dynamically adjust back the output voltages of CT rectifications to setting voltage value.Output voltage fluctuation of the present invention is small, dynamic response is fast, regulation performance is good, generate heat less and current protection range is wide, additionally it is possible to improve direct trip tripping output power；It is isolated using switching mode power supply transformer, increases the operational reliability of CPU.
Description
Technical field
The present invention relates to a kind of Self-power protective device more particularly to it is a kind of based on three-phase current sensing take electricity and tripping
Self-power protective device, and be related to including this and be based on what three-phase current sensing took electricity and the Self-power protective device of tripping
System.
Background technology
With the continuous development of urban power distribution network, a large amount of buried cable runs and ring main unit are generalizable；In looped network
The compactedness mounting location such as cabinet, control power supply generally installs flow directing device additional by PT cabinets and accumulator obtains power supply；According to biography
Unite electromagnetic potential sensor, be susceptible to space hold is big, high voltage electrode insulation sealing not enough and the hidden danger such as ferromagnetic resonance.From
Power supply protection device due to sensing way to take power using electric current, occupies little space, can exempt because installing flow directing device and electric power storage additional
Pond and the added burden brought, therefore be very suitable for ring main unit etc. and reliably control power supply without low pressure and need the field of defencive function
Institute.
The sensing of Self-power protective device electric current takes electricity, is to sense electric current from AC network using current transformer to obtain electricity
A kind of mode of energy, inputs the alternating current larger for amplitude fluctuations range in AC network, and output requirement is the straight of stabilization
Galvanic electricity pressure.In existing Self-power protective device, the first winding number of turn of current transformer is few, and first winding is connected on during use
In test line；The secondary winding number of turn is more, and electrical circuit is taken as the electric current sensing for electric winding access Self-power protective device.Electricity
The size of current transformer secondary current is determined that the magnetic potential that secondary current generates is to balance the magnetic potential of primary current by primary current
, such as second open circuit, impedance is infinitely great, and secondary current is equal to zero, and magnetic potential is also equal to zero, cannot remove balance primary current
The magnetic potential of generation, then primary current will all act on excitation, make the serious saturation of iron core；Magnetic saturation increases iron loss, electric current
Mutual inductor generates heat, and the insulation of current mutual inductor coil can be also damaged due to overheat；Remanent magnetism can be also generated on iron core, increase is mutual
Sensor error influences secondary current output, and then influences electric current sensing and take electricity；Most serious be due to magnetic saturation, alternating flux
Sine wave becomes trapezoidal wave, in magnetic flux vertiginous moment, higher voltage will be induced on secondary coil, peak value can arrive
Several kilovolts, so high voltage is acted on secondary coil and secondary circuit, and to personal and equipment, all there is serious threats.
So current transformer is not allow secondary side open running at any time.
Electric current sensing currently used for Self-power protective device takes electricity and dropout trip method, mainly there is following three kinds：1）
Electric CT secondary windings output high current is taken, when output voltage is beyond the voltage value of setting after rectification, triggering metal-oxide-semiconductor shutdown, and then
Electric CT secondary windings will be taken to open a way, rectifier output voltage to be made to drop to the voltage value of setting；Trip release electromagnet working power
It is provided by storage capacitor, is charged by battery and Switching Power Supply to storage capacitor.2）Electric CT secondary windings output high current is taken, it is whole
When output voltage is beyond the voltage value of setting after stream, by the way that metal-oxide-semiconductor is controlled to be connected, by rectifier bridge outlet side DC voltage short circuit,
And then electric CT secondary windings short circuit will be taken, rectifier output voltage to be made to drop to the voltage value of setting；This method is applied to using special
With customization current transformer Self-power protective device, while using Current Transformer Secondary electric current completion take electricity and analog quantity adopt
Collection.3）When taking electric CT secondary windings output high current, threshold voltage is used as by voltage-stabilizing device, triggers controlled silicon conducting, and then
CT secondary windings short circuit is stablized into rectifier output voltage.Tripping release electromagnet working power is provided by storage capacitor.More than
Three kinds of methods have the following problems 1）In first method, there is secondary side open running in current transformer, to the person
All there is serious threats with equipment；Tripping reliability of threading off is not high, and tripping energy comes from large capacity electrolysis storage capacitor,
The problem of there are leakage current height, and volume error is big, and heat-resisting quantity is poor, and usage time length easily fails.Tripping output can measure
Certainly in electrolytic capacitor amount of capacity.2）In second method, when three-phase takes electric CT secondary windings output high current, due to passing through control
Metal-oxide-semiconductor conducting processed, by the short circuit of rectifier bridge outlet side DC voltage, rectifier bridge fever is very serious, and influencing apparatus system operation can
By property；Current-mode analog quantity exports DC voltage to rectification by high-power resistance and samples, and precision is low, does not support harmonic measure and divides
Analysis；CPU does not have electrical isolation with rectifying output circuit and dropout trip circuit, and system reliability is not high.3）In the third method,
Due to voltage-stabilizing device action and return voltage deviation, control signal is power frequency, makes rectifier output voltage ripple big, unstable.
Invention content
The technical problems to be solved by the invention are to need to provide that a kind of output voltage fluctuation is small, dynamic response is fast, adjusts
Performance is good, generate heat less and current protection range is wide takes electricity and the Self-power protective device of tripping based on three-phase current sensing, and
Offer includes this and takes the system of electricity and the Self-power protective device of tripping based on three-phase current sensing, while it is straight also to be able to raising
Connect dropout tripping output power；It is isolated using switching mode power supply transformer, increases the CPU operational reliabilitys of Self-power protective device.
In this regard, the present invention provides a kind of Self-power protective device for sensing based on three-phase current and taking electricity and tripping, including：Three
Commutating phase and controlling circuit of voltage regulation, Switching Power Supply isolation circuit, thread off tripping control circuit and CPU, the three phase rectifier and steady
Pressure control circuit is connected by Switching Power Supply isolation circuit with the CPU, the three phase rectifier and controlling circuit of voltage regulation and institute
It states dropout tripping control circuit to be connected, the tripping control circuit of threading off is connected with the CPU；Wherein, the three-phase is whole
Stream and controlling circuit of voltage regulation are realized using PWM driving chips detects and controls its output voltage under current-mode, and described three
Commutating phase and controlling circuit of voltage regulation adjust its PWM frequency and duty ratio by adjusting RC oscillating circuits parameter, when described three
When taking that output voltage is beyond setting voltage value after electric CT rectifications of commutating phase and controlling circuit of voltage regulation, PWM is driven by current-mode
The high-frequency PWM signal of driving chip output, adjusts its conducting dutycycle, so dynamic reduce take the output voltage of electric CT rectifications with
Realization is pulled back to setting voltage value.
Further improvement of the present invention is, the three phase rectifier and controlling circuit of voltage regulation include threephase current transformer,
Rectifier bridge BR1, rectifier bridge BR2, metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q4, electrolytic capacitor E1, TVS pipe TVS1 and PWM
Driving chip U1, the output terminal of the threephase current transformer successively with the rectifier bridge BR1, rectifier bridge BR2 and TVS pipe TVS1
It is connected, the metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 are parallel to respectively on the rectifier diode of the rectifier bridge BR1, the metal-oxide-semiconductor Q3
It is parallel to respectively with metal-oxide-semiconductor Q4 on the rectifier diode of the rectifier bridge BR2, the TVS pipe TVS1 and the PWM driving chips
The power end of U1 is connected；Wherein, the threephase current transformer takes the electric CT secondary windings output current to be given after over commutation
Rear end electrolytic capacitor E1 charges, and when taking, electric CT secondary winding electric currents are excessive, when the voltage of electrolytic capacitor E1 is more than preset voltage value,
PWM driving chips U1 is driven to adjust its output signal duty ratio, control metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 by current-mode
It is simultaneously turned on metal-oxide-semiconductor Q4, electric current is directly realized by the conducting circuit of this four metal-oxide-semiconductors and flowed back, and then dynamic adjusts and takes electricity
The output voltage of CT rectifications pulls back to setting voltage value.
Further improvement of the present invention is, the conducting internal resistance of the metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4
Within 10 milliohms.
Further improvement of the present invention is, the rectifier bridge BR1 includes rectifier diode D1, rectifier diode D2, whole
Flow diode D3 and rectifier diode D4, the A phases of the threephase current transformer take electric CT outputs Motor Winding Same Name of Ends respectively with it is whole
The anode of stream diode D1 is connected with the cathode of rectifier diode D3, and the B phases of the threephase current transformer take electric CT to export
Cathode of the Motor Winding Same Name of Ends respectively with the anode of rectifier diode D2 and rectifier diode D4 is connected, the rectifier diode D1
Cathode be connected with the cathode of rectifier diode D2, the anode of the rectifier diode D3 and the anode phase of rectifier diode D4
Connection；The grid of the metal-oxide-semiconductor Q1 is connected with the output terminal of the PWM driving chips U1, the drain electrode of the metal-oxide-semiconductor Q1 and institute
The cathode for stating rectifier diode D3 is connected, and the source electrode of the metal-oxide-semiconductor Q1 is connected with the anode of the rectifier diode D3；Institute
The grid for stating metal-oxide-semiconductor Q2 is connected with the output terminal of the PWM driving chips U1, drain electrode and the rectification of the metal-oxide-semiconductor Q2
The cathode of diode D4 is connected, and the source electrode of the metal-oxide-semiconductor Q2 is connected with the anode of the rectifier diode D4.
Further improvement of the present invention is, the rectifier bridge BR2 includes rectifier diode D5, rectifier diode D6, whole
Flow diode D7 and rectifier diode D8, the C phases of the threephase current transformer take electric CT outputs Motor Winding Same Name of Ends respectively with it is whole
The anode of stream diode D5 is connected with the cathode of rectifier diode D7；The A phases of the threephase current transformer, B phases and C phases
Electric CT output windings non-same polarity is taken to be connected with each other, then be connected with the cathode of the anode of rectifier diode D6 and rectifier diode D8
It connects；The cathode of the rectifier diode D5 is connected with the cathode of rectifier diode D6, the anode of the rectifier diode D7 and
The anode of rectifier diode D8 is connected；The grid of the metal-oxide-semiconductor Q3 is connected with the output terminal of the PWM driving chips U1,
The drain electrode of the metal-oxide-semiconductor Q3 is connected with the cathode of the rectifier diode D7, the source electrode of the metal-oxide-semiconductor Q3 and the rectification two
The anode of pole pipe D7 is connected；The grid of the metal-oxide-semiconductor Q4 is connected with the output terminal of the PWM driving chips U1, the MOS
The drain electrode of pipe Q4 is connected with the cathode of the rectifier diode D8, the source electrode of the metal-oxide-semiconductor Q4 and the rectifier diode D8
Anode be connected.
Further improvement of the present invention is that the three phase rectifier and controlling circuit of voltage regulation further include inductance L1, diode
D9, diode D16, resistance R34, TVS pipe TVS2, capacitance C6, resistance R5, capacitance C2 and resistance R8, the two of the rectifier bridge BR2
The both ends respectively with the both ends of the electrolytic capacitor E1 and TVS pipe TVS1 is held to be connected, one end of the TVS pipe TVS1 passes through electricity
Sense L1 is connected to the anode of the diode D9, and the cathode of the diode D9 is connected with the anode of diode D16, and described two
The cathode of pole pipe D16 is connected to one end of TVS pipe TVS2 by resistance R34, the other end of the TVS pipe TVS2 respectively with capacitance
One end of C6 is connected with the power end of PWM driving chips U1, the other end ground connection of the capacitance C6；The PWM driving chips
The output terminal of U1 by resistance R5 respectively with one end of capacitance C2, one end of resistance R8, the grid of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 grid
Pole, metal-oxide-semiconductor Q3 grid be connected with the grid of metal-oxide-semiconductor Q4, the other end ground connection of the other end of the capacitance C2 and resistance R8.
Further improvement of the present invention is that the Switching Power Supply isolation circuit includes PWM driving chips, transformer and control
Feedback circuit processed, the input power of the Switching Power Supply isolation circuit take electric CT rectifications for three phase rectifier and controlling circuit of voltage regulation
Output voltage, export main road power supply and bypass power supply and be total to two-way power supply, the DC power supply that the main road power supply exports 5V is carried for CPU
For working power, the DC power supply of the bypass power supply output 24V or 5V is provided for 485 telecommunication circuits and switching value output circuit
Power supply；It is realized and is isolated by transformer between the main road power supply and bypass power supply.
Further improvement of the present invention is that the tripping control circuit of threading off includes resistance R200, capacitance C100, optocoupler
U100, resistance R300, resistance R400, resistance R500, resistance R600, capacitance C200, triode Q100, zener diode D600,
Zener diode D700, zener diode D800, diode D400, relay RL1, diode D200, TVS pipe TVS100, two
Pole pipe D500 and release electromagnet, one end of the resistance R200 are connected with the output terminal of CPU, and the resistance R200's is another
An input terminal respectively with one end of the capacitance C100 and optocoupler U100 is held to be connected, the other end of the capacitance C100 and
Another input terminal of optocoupler U100 is grounded respectively；An output terminal of the optocoupler U100 is connected to power supply by resistance R300
End, the one end of another output terminal of the optocoupler U100 respectively with one end of the resistance R400 and resistance R500 are connected,
The other end ground connection of the resistance R400, the other end of the resistance R500 respectively with one end of the resistance R600, capacitance
One end of C200 is connected with the base stage of triode Q100, the other end of the resistance R600, the other end and three of capacitance C200
The emitter of pole pipe Q100 is grounded respectively, and the collector of the triode Q100 is connected to the anode of zener diode D600, institute
The cathode for stating diode D600 is connected to the anode of the zener diode D700, the cathode connection of the zener diode D700
To the anode of the zener diode D800, the cathode of the zener diode D800 anode with the diode D400 respectively
It is connected with 4 pins of relay RL1, the cathode of the diode D400 and 3 pins of relay RL1 are respectively connected to power supply
End；The power end is connected to the anode of diode D200, and the cathode of the diode D200 is connected to 5 pipes of relay RL1
Foot；1 pin of the relay RL1 respectively with one end of the TVS pipe TVS100, the cathode of diode D500 and dropout electromagnetism
One end of iron is connected, the other end point of the other end of the TVS pipe TVS100, the anode of diode D500 and release electromagnet
It is not grounded.
Further improvement of the present invention is that the tripping control circuit of threading off further includes spare accumulator, described standby
Include diode D100, resistance R100, electrolytic capacitor E100 and diode D300, the sun of the diode D100 with accumulator
Pole is connected with power end, the cathode of the diode D100 by resistance R100 respectively with one end of electrolytic capacitor E100 and two
The anode of pole pipe D300 is connected, and the other end ground connection of the electrolytic capacitor E100, the cathode of the diode D300 is connected to
5 pins of relay RL1.
Electricity and the confession electric protection system of tripping are taken based on three-phase current sensing the present invention also provides a kind of, including as above institute
That states takes electricity and the Self-power protective device of tripping based on three-phase current sensing, further includes 485 telecommunication circuits and analog acquisition
Modulate circuit, 485 telecommunication circuit are connected respectively with the Switching Power Supply isolation circuit and CPU, the double winding CT's
Protective winding is connected to the CPU by analog acquisition modulate circuit.
Compared with prior art, the beneficial effects of the present invention are：Pass through conventional threephase current transformer or special-purpose taking
Electric CT realizes that sensing takes electricity, increases versatility；When the secondary winding of threephase current transformer exports high current, pass through current-mode
The PWM driving chips driving metal-oxide-semiconductor of formula, directly by the secondary winding short circuit of threephase current transformer, realizes three-phase current mutual inductance
The low internal resistance conducting afterflow of secondary side of device, avoids that electric CT second open circuits is taken to cause serious threat to the person and equipment；With existing skill
Voltage mode control in art is compared, and the present invention uses the control mode of current-mode, when rectifier output voltage or output loading
During variation, detection signal also changes and adjusts high-frequency PWM duty ratio therewith, and there is output voltage to fluctuate, and small, dynamic response is fast, adjusts
Save performance it is good, fever less with current protection range it is wide the advantages that, while also be able to improve thread off tripping control circuit output work
Rate；On this basis, the Switching Power Supply isolation circuit is isolated using switching mode power supply transformer, increases Self-power protective device
CPU operational reliabilitys；In addition, in the three phase rectifier and controlling circuit of voltage regulation, using 8 rectifier diodes and 4 low internal resistances
Metal-oxide-semiconductor, than in the prior art each phase current number of devices is at least reduced using the technical solutions of 4 rectifier diodes, drop
Low hardware cost saves device space.
Description of the drawings
Fig. 1 is the system structure diagram of an embodiment of the present invention；
Fig. 2 is the three phase rectifier of an embodiment of the present invention and the circuit diagram of controlling circuit of voltage regulation；
Fig. 3 be an embodiment of the present invention current-mode under PWM driving chips U1 built-in function schematic diagram；
Fig. 4 is current path schematic diagram when an embodiment of the present invention A phases take the secondary winding of electric CT direct short circuit；
Fig. 5 is the circuit diagram of the Switching Power Supply isolation circuit of an embodiment of the present invention；
Fig. 6 is the circuit diagram of the dropout tripping control circuit of an embodiment of the present invention；
Fig. 7 is the system structure diagram of another embodiment of the invention.
Specific embodiment
Below in conjunction with the accompanying drawings, the preferably embodiment of the present invention is described in further detail：
Embodiment 1：
As shown in Figure 1, this example provides a kind of Self-power protective device for being taken electricity based on three-phase current sensing and being tripped, packet
It includes：Three phase rectifier and controlling circuit of voltage regulation, Switching Power Supply isolation circuit, thread off tripping control circuit and CPU, the three phase rectifier
And controlling circuit of voltage regulation is connected by Switching Power Supply isolation circuit with the CPU, the three phase rectifier and controlling circuit of voltage regulation
It is connected with the tripping control circuit of threading off, the tripping control circuit of threading off is connected with the CPU；Wherein, described three
Commutating phase and controlling circuit of voltage regulation are realized using PWM driving chips detects and controls its output voltage under current-mode, institute
Three phase rectifier and controlling circuit of voltage regulation are stated by adjusting RC oscillating circuits parameter to adjust its PWM frequency and duty ratio, works as institute
When taking that output voltage is beyond setting voltage value after electric CT rectifications of three phase rectifier and controlling circuit of voltage regulation is stated, is driven by current-mode
The high-frequency PWM signal of PWM driving chips output adjusts its conducting dutycycle, and then dynamic reduces the output electricity for taking electric CT rectifications
Pressure is pulled back to setting voltage value to realize.
Three phase rectifier described in this example and controlling circuit of voltage regulation include rectifier bridge, TVS pipe, low internal resistance metal-oxide-semiconductor and current-mode
PWM driving chips etc.；The Switching Power Supply isolation circuit includes PWM driving chips, transformer and feedback control circuit；It is described
Tripping control circuit of threading off includes dropout control circuit and includes the spare accumulator of big capacity electrolyte capacitor；The CPU
The core cpu control system being made of microprocessor and peripheral circuit.The CT is current transformer, described to take electric CT rectifications
Output voltage for electric winding or measure output voltage of the winding after over commutation for the secondary of threephase current transformer.
As shown in Fig. 2, three phase rectifier described in this example and controlling circuit of voltage regulation include threephase current transformer, rectifier bridge BR1,
Rectifier bridge BR2, metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q4, electrolytic capacitor E1, TVS pipe TVS1 and PWM driving chip
U1, the output terminal of the threephase current transformer are connected successively with the rectifier bridge BR1, rectifier bridge BR2 and TVS pipe TVS1,
The metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 is parallel to respectively on the rectifier diode of the rectifier bridge BR1, the metal-oxide-semiconductor Q3 and metal-oxide-semiconductor
Q4 is parallel to respectively on the rectifier diode of the rectifier bridge BR2, the electricity of the TVS pipe TVS1 and PWM driving chips U1
Source is connected；Wherein, the secondary of the threephase current transformer supplies electric winding or measures winding output current after over commutation,
The secondary winding output current of electric CT is taken after over commutation as A phases, B phases and C phases are total to three-phase, is charged to rear end electrolytic capacitor E1,
When taking, electric CT secondary winding electric currents are excessive, and when the voltage of electrolytic capacitor E1 is more than preset voltage value, PWM is driven by current-mode
Driving chip U1 adjusts its output signal duty ratio, and control metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 are simultaneously turned on,
Electric current is directly realized by the conducting circuit of this four metal-oxide-semiconductors and flowed back, and then dynamic adjusts and the output voltage of electric CT rectifications is taken to return
It is adjusted to setting voltage value；The metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q4 conducting internal resistance within 10 milliohms,
When passing through high current, power consumption and switching loss very little.
As shown in figure 3, the current mode PWM driving chip U1, has current sample comparator Current-Sense
Comparator, by adjust the parameter of resistance R4 and capacitance C3 in RC oscillating circuits can be set as with PWM frequency 20KHz ~
150KHz, while PWM maximum duty cycles are turned up, realize dynamic regulation in the range of duty ratio 0 ~ 99%.
It is noted that for high current is avoided to lead to rectifier diode or rectification by rectifier diode or rectifier bridge
Bridge fever is larger so that takes electricity and the Self-power protective device internal temperature rise of tripping excessively high based on three-phase current sensing, influences base
The reliability service performance of electricity and the confession electric protection system of tripping is taken in three-phase current sensing, this example is directly by the metal-oxide-semiconductor Q1
It is parallel to respectively with metal-oxide-semiconductor Q2 on the rectifier diode of the rectifier bridge BR1, and by the metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 difference simultaneously
It is coupled on the rectifier diode of the rectifier bridge BR2.
Fig. 4 is current path schematic diagram when A phases take the secondary winding of electric CT direct short circuit, such as circuit diagram in Fig. 4
Thick line path shown in, be by taking A phases as an example, as rectifier output voltage VCC_24 V or VCC_48V excessively high, the metal-oxide-semiconductor Q1,
When metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 are all turned on, the thick line of Fig. 4 shows that the secondary winding output current for taking electric CT is returned
Flow path takes metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q4 circuit of the secondary winding output current return flow path of electric CT through too low internal resistance, approximate
Short circuit manner does not cause to take the secondary winding of electric CT to open a way, also without by rectifier diode D1 ~ rectifier diode D8, being
System temperature rises very little.
As shown in Fig. 2, rectifier bridge BR1 described in this example includes rectifier diode D1, rectifier diode D2, rectifier diode D3
With rectifier diode D4, the A phases of the threephase current transformer take electric CT outputs Motor Winding Same Name of Ends respectively with rectifier diode D1
Anode be connected with the cathode of rectifier diode D3, the B phases of the threephase current transformer take electric CT outputs Motor Winding Same Name of Ends
The cathode with the anode of rectifier diode D2 and rectifier diode D4 is connected respectively, the cathode of the rectifier diode D1 with it is whole
The cathode of stream diode D2 is connected, and the anode of the rectifier diode D3 is connected with the anode of rectifier diode D4；It is described
The grid of metal-oxide-semiconductor Q1 is connected with the output terminal of the PWM driving chips U1, the drain electrode of the metal-oxide-semiconductor Q1 and the rectification two
The cathode of pole pipe D3 is connected, and the source electrode of the metal-oxide-semiconductor Q1 is connected with the anode of the rectifier diode D3；The metal-oxide-semiconductor
The grid of Q2 is connected with the output terminal of the PWM driving chips U1, the drain electrode of the metal-oxide-semiconductor Q2 and the rectifier diode D4
Cathode be connected, the source electrode of the metal-oxide-semiconductor Q2 is connected with the anode of the rectifier diode D4.
As shown in Fig. 2, rectifier bridge BR2 described in this example includes rectifier diode D5, rectifier diode D6, rectifier diode D7
With rectifier diode D8, the C phases of the threephase current transformer take electric CT outputs Motor Winding Same Name of Ends respectively with rectifier diode D5
Anode be connected with the cathode of rectifier diode D7；The A phases of the threephase current transformer, B phases and C phases take electric CT to export
Winding non-same polarity is connected with each other, then is connected with the cathode of the anode of rectifier diode D6 and rectifier diode D8；It is described whole
The cathode of stream diode D5 is connected with the cathode of rectifier diode D6, the anode and rectifier diode of the rectifier diode D7
The anode of D8 is connected；The grid of the metal-oxide-semiconductor Q3 is connected with the output terminal of the PWM driving chips U1, the metal-oxide-semiconductor Q3
Drain electrode be connected with the cathode of the rectifier diode D7, the sun of the source electrode of the metal-oxide-semiconductor Q3 and the rectifier diode D7
Pole is connected；The grid of the metal-oxide-semiconductor Q4 is connected with the output terminal of the PWM driving chips U1, the drain electrode of the metal-oxide-semiconductor Q4
It is connected with the cathode of the rectifier diode D8, the source electrode of the metal-oxide-semiconductor Q4 is connected with the anode of the rectifier diode D8
It connects.
As shown in Fig. 2, three phase rectifier described in this example and controlling circuit of voltage regulation further include inductance L1, diode D9, diode
D16, resistance R34, TVS pipe TVS2, capacitance C6, resistance R5, capacitance C2 and resistance R8, the rectifier bridge BR2 both ends respectively with
The both ends of the electrolytic capacitor E1 are connected with the both ends of TVS pipe TVS1, and one end of the TVS pipe TVS1 is connected by inductance L1
To the anode of the diode D9, the cathode of the diode D9 is connected with the anode of diode D16, the diode D16
Cathode be connected to one end of TVS pipe TVS2 by resistance R34, the other end of the TVS pipe TVS2 respectively with capacitance C6 one
End is connected with the power end of PWM driving chips U1, the other end ground connection of the capacitance C6；The PWM driving chips U1's is defeated
Outlet by resistance R5 respectively with one end of capacitance C2, one end of resistance R8, the grid of metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q2, MOS
The grid of pipe Q3 is connected with the grid of metal-oxide-semiconductor Q4, the other end of the capacitance C2 and the other end ground connection of resistance R8.In order to aobvious
Show conveniently, in Fig. 2, fig. 4 to fig. 6, the output voltage of electric CT rectifications is taken to represent VCC_24 V or VCC_48V with VCC_24＆48V
Output voltage.
This example uses 8 rectifier diodes and 4 low internal resistance metal-oxide-semiconductors, completes to take electric CT's to threephase current transformer
The rectification of secondary winding output current and voltage stabilizing；Rectifier diode low internal resistance metal-oxide-semiconductor in parallel, over-current over-voltage protection are used in rectifier bridge
Input front end and then the secondary winding short circuit mode that three-phase is directly taken to electric CT.It is described to take electric CT as with for electric winding or measurement
The threephase current transformer of winding specifically includes A phases and takes electric CT, B phase that electric CT with C phases is taken to take electric CT.
As depicted in figs. 1 and 2, this example is in three phase rectifier and controlling circuit of voltage regulation, using the PWM of the high frequency of detection control
PWM frequency by adjusting RC oscillating circuit parameters, can be set as 20KHz ~ 150KHz, while be turned up PWM's by driving chip U1
Maximum duty cycle, realize duty ratio 0 ~ 99% in the range of dynamic regulation, meet three-phase take electric CT secondary winding export high current when
Over-pressed short-circuit protection requirement.The built-in function schematic diagram of PWM driving chips U1 is as shown in Fig. 2, when taking electricity under the current-mode
When output voltage is beyond setting voltage value 24VDC or 48VDC after CT rectifications, exported by the PWM driving chips U1 of current-mode
High-frequency PWM signal quickly adjusts its conducting dutycycle, controls metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and the metal-oxide-semiconductor Q4 of low internal resistance
Conducting, and then short circuit is carried out, and then can dynamically reduce in the secondary winding that three-phase is directly taken electric CT by rectifier bridge input front end
Output voltage is adjusted to the setting voltage value after taking electric CT rectifications.The setting voltage value is defaulted as 24VDC or 48VDC, is used for
Different according to the demand of practical application as the setting input voltage of power end, which can adjust.Current-mode
PWM driving chips U1 VCC power supplys pass through rectifier output voltage connect high-power resistance R34 and TVS pipe TVS2 input, TVS
Pipe TVS2 is as power supply threshold voltage, when three-phase takes the secondary winding of electric CT to export low current, current mode PWM driving chip
U1 will not work, and CPU may operate under low-power consumption mode, and display is facilitated to check and fixed value adjusting etc..
The three-phase takes electric CT that double winding output type both may be used, and one of which output is defeated as ac sampling signal
Go out to the analog acquisition modulate circuit that electricity and the confession electric protection system of tripping are taken based on three-phase current sensing, another group of output
The three phase rectifier and controlling circuit of voltage regulation are accessed as electric winding；The three-phase current mutual inductance of general measure can also be used
Device.
The VCC power supplys of the PWM driving chips U1 of current-mode pass through rectifier output voltage series connection high-power resistance and TVS pipe
Input, TVS pipe is as power supply threshold voltage, and when three-phase takes the secondary winding of electric CT to export low current, PWM driving chips will not
Work, and CPU at this time may operate under low-power consumption mode, and display is facilitated to check and fixed value adjusting etc..
The three-phase of three phase rectifier described in this example and controlling circuit of voltage regulation takes electric CT, two-phase that electric CT or single-phase is taken to take the two of electric CT
Secondary winding current input charges to power supply capacitor after over commutation, and rectification is exported electricity by current mode PWM driving chip U1
Pressure is dynamically adapted to the setting voltage value such as 24VDC or 48VDC, and the setting voltage value as Switching Power Supply isolation circuit and is taken off
The working power of button tripping control circuit etc..Three-phase exports burning voltage after taking electric CT rectifications, directly as release electromagnet
Working power, while give large capacity energy storage electrolytic capacitor E100 by the resistance R100 that power is more than 2W, resistance value is more than 1K
Charging, the standby working power as release electromagnet.
As shown in figure 5, Switching Power Supply isolation circuit described in this example is designed using inverse-excitation type, including PWM driving chips U2, become
Depressor T1 and feedback control circuit, the input power of the Switching Power Supply isolation circuit is three phase rectifier and controlling circuit of voltage regulation
Output voltage the VCC_24 V or VCC_48V of electric CT rectifications are taken, main road power supply is exported and bypass power supply is total to two-way power supply, the master
The DC power supply of road power supply output 5V provides working power for CPU, and the DC power supply of the bypass power supply output 24V or 5V is logical for 485
Believe that circuit and switching value output circuit provide power supply；Between the main road power supply and bypass power supply by transformer T1 realize every
From ensure that CPU reliabilities of operation.
As shown in fig. 6, tripping control circuit of threading off described in this example includes resistance R200, capacitance C100, optocoupler U100, resistance
R300, resistance R400, resistance R500, resistance R600, capacitance C200, triode Q100, zener diode D600, zener diode
D700, zener diode D800, diode D400, relay RL1, diode D200, TVS pipe TVS100, diode D500 and
Release electromagnet, one end of the resistance R200 are connected with the output terminal of CPU, the other end of the resistance R200 respectively with institute
The one end for stating capacitance C100 is connected with an input terminal of optocoupler U100, the other end of the capacitance C100 and optocoupler U100's
Another input terminal is grounded respectively；An output terminal of the optocoupler U100 is connected to power end, the light by resistance R300
The one end of another output terminal of coupling U100 respectively with one end of the resistance R400 and resistance R500 is connected, the resistance
The other end ground connection of R400, the other end of the resistance R500 respectively with one end of the resistance R600, one end of capacitance C200
It is connected with the base stage of triode Q100, the other end of the resistance R600, the other end of capacitance C200 and triode Q100
Emitter is grounded respectively, and the collector of the triode Q100 is connected to the anode of zener diode D600, the diode
The cathode of D600 is connected to the anode of the zener diode D700, and the cathode of the zener diode D700 is connected to described steady
Press the anode of diode D800, the cathode of the zener diode D800 anode and relay with the diode D400 respectively
4 pins of RL1 are connected, and the cathode of the diode D400 and 3 pins of relay RL1 are respectively connected to power end；It is described
Power end is connected to the anode of diode D200, and the cathode of the diode D200 is connected to 5 pins of relay RL1；It is described
1 pin of relay RL1 respectively with one end of the TVS pipe TVS100, the cathode of diode D500 and release electromagnet one
End is connected, and the other end, the anode of diode D500 and the other end of release electromagnet of the TVS pipe TVS100 connect respectively
Ground.
As shown in fig. 6, tripping control circuit of threading off described in this example further includes spare accumulator, the spare accumulator
Including diode D100, resistance R100, electrolytic capacitor E100 and diode D300, the anode and power end of the diode D100
Be connected, the cathode of the diode D100 by resistance R100 respectively with one end of electrolytic capacitor E100 and diode D300
Anode is connected, and the other end ground connection of the electrolytic capacitor E100, the cathode of the diode D300 is connected to relay RL1's
5 pins.
Fig. 6 show the circuit diagram of dropout tripping control circuit that the CPU is accurately reliably controlled, and three-phase takes electric CT
The rectified voltage stabilizing of secondary winding output current after directly as release electromagnet working power VCC_24 V or VCC_48V, together
When by high-power more than 2W, the resistance R100 of more than resistance value 1K, large capacity energy storage electrolytic capacitor E100 chargings are given, as dropout
Electromagnet standby working power, release electromagnet action are controlled by relay RL1, and relay RL1 can also use big work(in addition
Rate triode, IGBT etc..CPU controls relay RL1 action signals CPU_TC_OUT to be isolated by optocoupler U100, ensures reliable
Property.The spare accumulator needs to weld to application scenario of the release electromagnet operating power more than more than 200W, other should
With the partial circuit can not be included.
For common release electromagnet, if its operating voltage 24VDC models, when the single-phase secondary winding for taking electric CT
For output current in more than 200mA, the D.C. resistance that can reliably thread off is release electromagnet more than 50 Europe；It is single-phase to take electric CT's
For secondary winding output current in more than 2.5A, the D.C. resistance that can reliably thread off is release electromagnet more than 7 Europe；Two-phase takes
For the secondary winding output current of electric CT in more than 150mA, the D.C. resistance that can reliably thread off is dropout electromagnetism more than 50 Europe
Iron；Two-phase takes the secondary winding output current of electric CT in more than 1A, and the D.C. resistance that can reliably thread off is dropout more than 7 Europe
Electromagnet；Three-phase takes the secondary winding output current of electric CT in more than 130mA, the D.C. resistance that can reliably thread off for 50 Europe with
On release electromagnet；Three-phase takes the secondary winding output current of electric CT in more than 1A, and the D.C. resistance that can reliably thread off is 7
Release electromagnet more than Europe；Three-phase takes the secondary winding output current of electric CT, and in more than 5A, can reliably thread off direct current
It hinders for release electromagnets more than 5 Europe.
For common release electromagnet, if its operating voltage 24VDC models, the single-phase secondary winding for taking electric CT is defeated
Go out electric current in more than 200mA, the D.C. resistance that can reliably thread off in cold start-up fast tripping protection 80ms is dropout more than 50 Europe
Electromagnet；The single-phase secondary winding output current for taking electric CT, can be reliable in cold start-up fast tripping protection 80ms in more than 2.2A
Dropout D.C. resistance is release electromagnet more than 7 Europe；Two-phase takes the secondary winding output current of electric CT in more than 100mA,
The D.C. resistance that can reliably thread off in cold start-up fast tripping protection 80ms is release electromagnet more than 50 Europe；Two-phase takes the two of electric CT
Secondary winding output current can reliably thread off D.C. resistance to be more than 7 Europe in more than 1A, in cold start-up fast tripping protection 80ms
Release electromagnet；Three-phase takes the secondary winding output current of electric CT in more than 75mA, can be in cold start-up fast tripping protection 80ms
Reliable dropout D.C. resistance is release electromagnet more than 50 Europe；Three-phase takes the secondary winding output current of electric CT in more than 1A
When, the D.C. resistance that can reliably thread off in cold start-up fast tripping protection 80ms is release electromagnet more than 7 Europe；Three-phase takes electric CT's
Secondary winding output current can reliably thread off D.C. resistance to be more than 4 Europe in more than 5A, in cold start-up fast tripping protection 80ms
Release electromagnet.The cold start-up fast tripping protection refers to direct He Zhong Library circuit, and Self-power protective device can be quick
Start, to realize that CPU exports rapidly the function of circuit breaker tripping trip signal.
This example realizes that sensing takes electricity by conventional threephase current transformer or Special electricity getting CT, and versatility is very strong；When three
During the secondary winding output high current of phase current mutual inductor, metal-oxide-semiconductor is driven by the PWM driving chips of current-mode, directly will
The secondary winding short circuit of threephase current transformer realizes the low internal resistance conducting afterflow of secondary side of threephase current transformer, avoids taking
Electric CT second open circuits cause serious threat to the person and equipment；Compared with voltage mode of the prior art controls, the present invention adopts
With the control mode of current-mode, when rectifier output voltage or output loading variation, detection signal also changes and adjusts therewith
High-frequency PWM duty ratio, there is output voltage to fluctuate, and small, dynamic response is fast, regulation performance is good, fever is wide with current protection range less
The advantages that, while it also is able to improve the output power for tripping control circuit of threading off；On this basis, the Switching Power Supply isolation electricity
Road is isolated using switching mode power supply transformer, increases the CPU operational reliabilitys of Self-power protective device；In addition, the three phase rectifier
And in controlling circuit of voltage regulation, using 8 rectifier diodes and 4 low internal resistance metal-oxide-semiconductors, each phase current is at least than in the prior art
Number of devices is reduced using the technical solution of 4 rectifier diodes, hardware cost is reduced, saves device space.
Embodiment 2：
As shown in fig. 7, electricity and the confession electric protection system of tripping are taken based on three-phase current sensing the present invention also provides a kind of,
Including taking electricity and the Self-power protective device of tripping based on three-phase current sensing as described in Example 1,485 communications electricity is further included
Road and analog acquisition modulate circuit, 485 telecommunication circuit are connected respectively with the Switching Power Supply isolation circuit and CPU,
The protective winding of the double winding CT is connected to the CPU by analog acquisition modulate circuit.
This example include three phase rectifier and controlling circuit of voltage regulation, Switching Power Supply isolation circuit, tripping control circuit of threading off, CPU,
Analog acquisition modulate circuit and 485 telecommunication circuits etc. are highly suitable for the fields such as 6 ~ 20kV ring main units, distribution substation and switching station
It closes.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, several simple deduction or replace can also be made, should all be considered as belonging to the present invention's
Protection domain.
Claims (9)
1. a kind of take electricity and the Self-power protective device of tripping based on three-phase current sensing, which is characterized in that including：Three phase rectifier
And controlling circuit of voltage regulation, Switching Power Supply isolation circuit, dropout tripping control circuit and CPU, the three phase rectifier and voltage stabilizing control
Circuit is connected by Switching Power Supply isolation circuit with the CPU, the three phase rectifier and controlling circuit of voltage regulation and the dropout
Tripping control circuit is connected, and the tripping control circuit of threading off is connected with the CPU；Wherein, the three phase rectifier and steady
Pressure control circuit uses PWM driving chips to realize and its output voltage is detected and controlled under current-mode, the three phase rectifier
And controlling circuit of voltage regulation adjusts its PWM frequency and duty ratio by adjusting RC oscillating circuits parameter, when the three phase rectifier
And when taking that output voltage is beyond setting voltage value after electric CT rectifications of controlling circuit of voltage regulation, by current-mode driving PWM driving cores
The high-frequency PWM signal of piece output, adjusts its conducting dutycycle, so dynamic reduce take the output voltage of electric CT rectifications with realize by
It pulls back to setting voltage value；
The three phase rectifier and controlling circuit of voltage regulation include threephase current transformer, rectifier bridge BR1, rectifier bridge BR2, metal-oxide-semiconductor Q1,
Metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q4, electrolytic capacitor E1, TVS pipe TVS1 and PWM driving chip U1, the three-phase current mutual inductance
The output terminal of device is connected successively with the rectifier bridge BR1, rectifier bridge BR2 and TVS pipe TVS1, the metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2
It is parallel to respectively on the rectifier diode of the rectifier bridge BR1, the metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 are parallel to the rectification respectively
On the rectifier diode of bridge BR2, the TVS pipe TVS1 is connected with the power end of the PWM driving chips U1；Wherein, it is described
Threephase current transformer takes electric CT secondary windings output current after over commutation, rear end electrolytic capacitor E1 chargings is given, when taking electricity
CT secondary winding electric currents are excessive, when the voltage of electrolytic capacitor E1 is more than preset voltage value, PWM driven to drive core by current-mode
Piece U1 adjusts its output signal duty ratio, and control metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 are simultaneously turned on, and electric current is straight
Realize reflux, and then dynamic adjusts and the output voltage of electric CT rectifications is taken to pull back in the conducting circuit for connecting this four metal-oxide-semiconductors
Set voltage value.
2. according to claim 1 take electricity and the Self-power protective device of tripping based on three-phase current sensing, feature exists
In, the metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 conducting internal resistance within 10 milliohms.
3. according to claim 1 take electricity and the Self-power protective device of tripping based on three-phase current sensing, feature exists
Include rectifier diode D1, rectifier diode D2, rectifier diode D3 and rectifier diode D4 in, the rectifier bridge BR1, it is described
The A phases of threephase current transformer take electric CT output Motor Winding Same Name of Ends respectively with the anode of rectifier diode D1 and rectifier diode D3
Cathode be connected, the B phases of the threephase current transformer take electric CT to export Motor Winding Same Name of Ends respectively with rectifier diode D2's
Anode is connected with the cathode of rectifier diode D4, and the cathode of the rectifier diode D1 is connected with the cathode of rectifier diode D2
It connects, the anode of the rectifier diode D3 is connected with the anode of rectifier diode D4；The grid of the metal-oxide-semiconductor Q1 with it is described
The output terminal of PWM driving chips U1 is connected, and the drain electrode of the metal-oxide-semiconductor Q1 is connected with the cathode of the rectifier diode D3,
The source electrode of the metal-oxide-semiconductor Q1 is connected with the anode of the rectifier diode D3；The grid of the metal-oxide-semiconductor Q2 drives with the PWM
The output terminal of dynamic chip U1 is connected, and the drain electrode of the metal-oxide-semiconductor Q2 is connected with the cathode of the rectifier diode D4, described
The source electrode of metal-oxide-semiconductor Q2 is connected with the anode of the rectifier diode D4.
4. according to claim 1 take electricity and the Self-power protective device of tripping based on three-phase current sensing, feature exists
Include rectifier diode D5, rectifier diode D6, rectifier diode D7 and rectifier diode D8 in, the rectifier bridge BR2, it is described
The C phases of threephase current transformer take electric CT output Motor Winding Same Name of Ends respectively with the anode of rectifier diode D5 and rectifier diode D7
Cathode be connected；The A phases of the threephase current transformer, B phases and C phases take electric CT outputs winding non-same polarity mutually to interconnect
It connects, then is connected with the cathode of the anode of rectifier diode D6 and rectifier diode D8；The cathode of the rectifier diode D5 with
The cathode of rectifier diode D6 is connected, and the anode of the rectifier diode D7 is connected with the anode of rectifier diode D8；Institute
The grid for stating metal-oxide-semiconductor Q3 is connected with the output terminal of the PWM driving chips U1, drain electrode and the rectification of the metal-oxide-semiconductor Q3
The cathode of diode D7 is connected, and the source electrode of the metal-oxide-semiconductor Q3 is connected with the anode of the rectifier diode D7；The MOS
The grid of pipe Q4 is connected with the output terminal of the PWM driving chips U1, drain electrode and the rectifier diode of the metal-oxide-semiconductor Q4
The cathode of D8 is connected, and the source electrode of the metal-oxide-semiconductor Q4 is connected with the anode of the rectifier diode D8.
5. according to claim 1 take electricity and the Self-power protective device of tripping based on three-phase current sensing, feature exists
In the three phase rectifier and controlling circuit of voltage regulation further include inductance L1, diode D9, diode D16, resistance R34, TVS pipe
TVS2, capacitance C6, resistance R5, capacitance C2 and resistance R8, the rectifier bridge BR2 both ends respectively with the electrolytic capacitor E1 two
End is connected with the both ends of TVS pipe TVS1, and one end of the TVS pipe TVS1 is connected to the sun of the diode D9 by inductance L1
Pole, the cathode of the diode D9 are connected with the anode of diode D16, and the cathode of the diode D16 is connected by resistance R34
Be connected to one end of TVS pipe TVS2, the other end of the TVS pipe TVS2 respectively with one end of capacitance C6 and PWM driving chips U1
Power end is connected, the other end ground connection of the capacitance C6；The output terminal of the PWM driving chips U1 by resistance R5 respectively with
One end of capacitance C2, one end of resistance R8, the grid of metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q2, the grid of metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4
Grid be connected, the other end ground connection of the other end of the capacitance C2 and resistance R8.
6. the confession electric protection of electricity and tripping dress is taken based on three-phase current sensing according to claim 1 to 5 any one
It puts, which is characterized in that the Switching Power Supply isolation circuit includes PWM driving chips, transformer and feedback control circuit, described to open
The input power for closing power isolation circuit is three phase rectifier and the output voltage for taking electric CT rectifications of controlling circuit of voltage regulation, and output is led
Road power supply and bypass power supply are total to two-way power supply, and the DC power supply of the main road power supply output 5V provides working power for CPU, described auxiliary
The DC power supply of road power supply output 24V or 5V provides power supply for 485 telecommunication circuits and switching value output circuit；The main road power supply
It is realized and is isolated by transformer between bypass power supply.
7. the confession electric protection of electricity and tripping dress is taken based on three-phase current sensing according to claim 1 to 5 any one
It puts, which is characterized in that the tripping control circuit of threading off includes resistance R200, capacitance C100, optocoupler U100, resistance R300, electricity
Hinder R400, resistance R500, resistance R600, capacitance C200, triode Q100, zener diode D600, zener diode D700, steady
Press diode D800, diode D400, relay RL1, diode D200, TVS pipe TVS100, diode D500 and dropout electromagnetism
Iron, one end of the resistance R200 are connected with the output terminal of CPU, the other end of the resistance R200 respectively with the capacitance
One end of C100 is connected with an input terminal of optocoupler U100, the other end of the capacitance C100 and optocoupler U100 another
Input terminal is grounded respectively；An output terminal of the optocoupler U100 is connected to power end, the optocoupler U100 by resistance R300
One end respectively with one end of the resistance R400 and resistance R500 of another output terminal be connected, the resistance R400's is another
One end is grounded, the other end of the resistance R500 respectively with one end of the resistance R600, one end of capacitance C200 and triode
The base stage of Q100 is connected, the emitter point of the other end of the resistance R600, the other end of capacitance C200 and triode Q100
It is not grounded, the collector of the triode Q100 is connected to the anode of zener diode D600, the zener diode D600's
Cathode is connected to the anode of the zener diode D700, and the cathode of the zener diode D700 is connected to two pole of voltage stabilizing
The anode of pipe D800, the cathode of the zener diode D800 respectively with the anode of the diode D400 and relay RL1 4
Pin is connected, and the cathode of the diode D400 and 3 pins of relay RL1 are respectively connected to power end；The power end
The anode of diode D200 is connected to, the cathode of the diode D200 is connected to 5 pins of relay RL1；The relay
1 pin of RL1 is connected respectively with one end of the TVS pipe TVS100, the cathode of diode D500 and one end of release electromagnet
It connects, the other end, the anode of diode D500 and the other end of release electromagnet of the TVS pipe TVS100 are grounded respectively.
8. according to claim 7 take electricity and the Self-power protective device of tripping based on three-phase current sensing, feature exists
In the tripping control circuit of threading off further includes spare accumulator, and the spare accumulator includes diode D100, resistance
R100, electrolytic capacitor E100 and diode D300, the anode of the diode D100 are connected with power end, the diode
The cathode of D100 is connected by anodes of the resistance R100 respectively with one end of electrolytic capacitor E100 and diode D300, the electricity
The other end ground connection of capacitance E100 is solved, the cathode of the diode D300 is connected to 5 pins of relay RL1.
9. a kind of take electricity and the confession electric protection system of tripping based on three-phase current sensing, which is characterized in that will including such as right
It asks and electricity and the Self-power protective device of tripping is taken based on three-phase current sensing described in 1 to 8 any one, further include 485 communications
Circuit and analog acquisition modulate circuit, 485 telecommunication circuit are connected respectively with the Switching Power Supply isolation circuit and CPU
It connects, the protective winding of every phase double winding CT of the threephase current transformer is connected to described by analog acquisition modulate circuit
CPU。
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| CN107453315A (en) * | 2017-09-26 | 2017-12-08 | 烟台海珐电气科技有限公司 | A kind of protection device of current transformer power taking |
| KR102086529B1 (en) * | 2018-05-18 | 2020-03-09 | 엘에스산전 주식회사 | Shelf power relay and method for preventing operation error thereof |
| CN109787185A (en) * | 2019-01-30 | 2019-05-21 | 宁波东海自动控制设备有限公司 | A kind of self-powered microcomputer protecting device of belt current tripping |
| CN112054585A (en) * | 2020-08-24 | 2020-12-08 | 杭州电子科技大学 | Three-section type current transformer power-taking circuit |
| CN112234593B (en) * | 2020-09-25 | 2022-07-15 | 福建和盛高科技产业有限公司 | Overcurrent protection circuit for CT induction power taking |
| CN111969563B (en) * | 2020-10-21 | 2021-01-19 | 深圳市永联科技股份有限公司 | Control method for short-circuit identification and protection of output rectifier tube |
| CN113054850B (en) * | 2021-03-30 | 2022-06-24 | 上海喜坤电子科技有限公司 | Switch control circuit based on current transformer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611301A (en) * | 2012-03-08 | 2012-07-25 | 北京科锐配电自动化股份有限公司 | CT (Current Transducer) power circuit |
| CN203562843U (en) * | 2013-11-07 | 2014-04-23 | 北京安通尼电子技术有限公司 | Self-powered protective device based on current induction power source |
| CN204156616U (en) * | 2014-11-11 | 2015-02-11 | 苏州银蕨电力科技有限公司 | For the self-induction power-supply circuit of intelligent grid sensing device |
| CN104374986A (en) * | 2014-11-18 | 2015-02-25 | 浙江正泰电器股份有限公司 | Novel current sampling circuit and electronic controller of breaker |
| CN204721240U (en) * | 2015-06-25 | 2015-10-21 | 广州视源电子科技股份有限公司 | A kind of switching power circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6047442B2 (en) * | 2013-03-29 | 2016-12-21 | 富士電機株式会社 | Power supply device |
-
2015
- 2015-11-30 CN CN201510860340.6A patent/CN105375435B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611301A (en) * | 2012-03-08 | 2012-07-25 | 北京科锐配电自动化股份有限公司 | CT (Current Transducer) power circuit |
| CN203562843U (en) * | 2013-11-07 | 2014-04-23 | 北京安通尼电子技术有限公司 | Self-powered protective device based on current induction power source |
| CN204156616U (en) * | 2014-11-11 | 2015-02-11 | 苏州银蕨电力科技有限公司 | For the self-induction power-supply circuit of intelligent grid sensing device |
| CN104374986A (en) * | 2014-11-18 | 2015-02-25 | 浙江正泰电器股份有限公司 | Novel current sampling circuit and electronic controller of breaker |
| CN204721240U (en) * | 2015-06-25 | 2015-10-21 | 广州视源电子科技股份有限公司 | A kind of switching power circuit |
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