CN102623947B - A kind of earth leakage protective device with phase line handoff functionality - Google Patents
A kind of earth leakage protective device with phase line handoff functionality Download PDFInfo
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- CN102623947B CN102623947B CN201210088012.5A CN201210088012A CN102623947B CN 102623947 B CN102623947 B CN 102623947B CN 201210088012 A CN201210088012 A CN 201210088012A CN 102623947 B CN102623947 B CN 102623947B
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- 230000001681 protective effect Effects 0.000 title claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 230000002457 bidirectional effect Effects 0.000 claims description 36
- 238000012790 confirmation Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000001012 protector Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000005513 bias potential Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- WYROLENTHWJFLR-ACLDMZEESA-N queuine Chemical compound C1=2C(=O)NC(N)=NC=2NC=C1CN[C@H]1C=C[C@H](O)[C@@H]1O WYROLENTHWJFLR-ACLDMZEESA-N 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses a kind of earth leakage protective device with phase line handoff functionality, comprise current transformer and three-phase current detection circuit, current transformer is for detecting leakage current and exporting electric leakage signal, current transformer output connects amplifying circuit, amplifying circuit is input to single-chip microcomputer after amplifying described electric leakage signal, current detection circuit connects current signal receiving circuit, current signal is inputted single-chip microcomputer by three-phase current signal receiving circuit, current signal receiving circuit is for receiving three-phase current signal, the output of single-chip microcomputer connects drive circuit, drive circuit drives the switch be connected in triple line, drive circuit is connected to the input of single-chip microcomputer by feedback circuit, the drive singal of drive circuit is input to single-chip microcomputer by feedback circuit.The present invention can switch automatically according to loading condition between three-phase, balances the electric current between three-phase with this, reduces the harm that three alternate current imbalances bring, makes electrical network even running, improves power supply quality.
Description
Technical field
The present invention relates to a kind of novel multifunctional electric leakage protector.
Background technology
In low-voltage network, transmission line generally adopts three-phase four-wire system.In city dweller and rural power grids electric power system, because electricity consumer mostly is single-phase load or single-phase mixed with three-phase load, and payload is different and the difference of electricity consumption time, so inherently must there is unsymmetrical current between electrical network three-phase.Unsymmetrical current can increase the electric energy loss of circuit and transformer, reduces exerting oneself of transformer, easily causes the imbalance of three-phase voltage.Earth leakage protective device on market only has the basic defencive function such as electric leakage, overcurrent, short circuit, over-and under-voltage.This type of earth leakage protective device cannot switch carrying out between phase line intelligence, causes still there is above-mentioned problem when practical application.And existing earth leakage protective device all adopts electromagnetic relay, this mechanical contact-type switch in use there will be spark phenomenon, uses for a long time or is easily oxidized in the presence of a harsh environment, protection act can be caused to stablize triggering.
Summary of the invention
For above Problems existing; the invention provides a kind of novel multifunctional electric leakage protector; this electric leakage protector can not only realize the defencive functions such as basic electric leakage, overcurrent, short circuit, over-and under-voltage; automatically the switching can also carrying out between phase line according to existing each phase line loading condition; balance the electric current between three-phase to a certain extent; make electrical network even running, improve power supply quality.
A kind of earth leakage protective device with phase line handoff functionality, comprise current transformer and three-phase current detection circuit, current transformer is for detecting leakage current and exporting electric leakage signal, current transformer output connects amplifying circuit, amplifying circuit is input to single-chip microcomputer after amplifying described electric leakage signal, described current detection circuit connects current signal receiving circuit, current signal is inputted single-chip microcomputer by three-phase current signal receiving circuit, current signal receiving circuit is for receiving three-phase current signal, the output of single-chip microcomputer connects drive circuit, drive circuit drives the switch be connected in triple line, drive circuit is connected to the input of single-chip microcomputer by feedback circuit, the drive singal of drive circuit is input to single-chip microcomputer by feedback circuit.
Described switch adopts bidirectional thyristor switch.
Described drive circuit comprises the triode be connected with single-chip microcomputer output, and triode connects light-operated bidirectional triode thyristor, and light-operated bidirectional triode thyristor connects bidirectional thyristor switch.
Described bidirectional thyristor switch connects the protective circuit be made up of resistance R13, electric capacity C2, piezo-resistance R14.
Described bidirectional thyristor switch is connected with and punctures testing circuit, puncture the input that testing circuit is connected to single-chip microcomputer.
The described testing circuit that punctures comprises filter capacitor, differential amplifier circuit and compare output circuit.The pressure drop of bidirectional thyristor two ends is inputted by diode D2, D3 of one-way conduction, then after resistance R15, R16, R17, R18 dividing potential drop, is input to operational amplifier OP3, OP4.Operational amplifier OP3, OP4 form differential amplifier circuit, and the output of differential amplifier circuit is connected to comparator OP5 anode.Comparator OP5 negative terminal is connected with biasing resistor R24, R25, comparator OP5 output connecting luminous diode D1.
Described current signal receiving circuit receives the electric current of three-phase firewire, current value is input in single-chip microcomputer, when the electric current of certain phase firewire exceedes set point, and the load of other phases lighter time, namely meet the switching condition between phase line, single-chip microcomputer output signal controls drive circuit, and drive circuit driving switch disconnects this phase line, then single-chip microcomputer outputs signal control drive circuit again, and drive circuit controls the phase line that driving switch conducting needs to connect.
The drive singal of drive circuit is input to single-chip microcomputer by described feedback circuit, and after single-chip microcomputer receives the cut-out of drive singal confirmation phase line, conducting needs the phase line of connection again.
The present invention has following advantage relative to prior art:
1. automatically can switch according to the loading condition between three-phase.Balance the electric current between three-phase with this, reduce the harm that three alternate current imbalances bring, make electrical network even running, improve power supply quality.
2. adopt bidirectional thyristor electronic switch to eliminate the spark phenomenon of mechanical contact switch.Owing to there is no mechanical part, in HI high impact, can work under the environment of vibration.Electronic switch is highly sensitive simultaneously, and switching speed is fast, and required driving power is very little.
3., owing to there is no coil in electronic switch, thus decrease electromagnetic interference.Under three-phase handoff functionality, adopt electronic switch effectively can reduce the volume of earth leakage protective device, bring conveniently to installation.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention.
Fig. 2 is that the present invention specifically forms and connection diagram.
Fig. 3 be the electronic switch that adopts of the present invention puncture testing circuit.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated:
With an earth leakage protective device for phase line handoff functionality, its schematic block circuit diagram as shown in Figure 1, comprises zero sequence current mutual inductor 1; amplifying circuit 2, single-chip microcomputer 3, drive circuit 4; drive singal feedback circuit 5, punctures testing circuit 6, current signal receiving circuit 7 and three-phase current detection circuit 8.The input of earth leakage protective device is connected with three of three phase mains live wires (L1, L2, L3) and zero line N, and output is then according to certain automatically selected live wire of loading condition and zero line N.The break-make of live wire L1 is determined by electronic switch K1, in like manner live wire L2, L3 is connected to electronic switch K2, K3.Protected three phase lines and zero line, all through ring-shaped core, form the primary winding of zero sequence current mutual inductor 1, when so no matter which bar phase line provides working power, all only need the detection that a zero sequence current mutual inductor just can carry out leaking electricity.Current transformer 1 leaks electricity for detecting and exports electric leakage signal.Current transformer 1 output is connected to the input of amplifying circuit 2, and amplifying circuit 2 carries out amplification process to described electric leakage signal, and this signal is supplied to single-chip microcomputer 3.Amplifying circuit 2 output is connected to the input of single-chip microcomputer 3.
Single-chip microcomputer 3 output connects drive circuit 4, three electronic switches and carry out break-make under this control signal.To automatically switch between phase line, just must obtain the current information of three-phase firewire in advance, the current information of three-phase firewire is first detected by three-phase current detection circuit 8, then current signal receiving circuit 7 receives the three-phase current value separately that three-phase current detection circuit 8 detects, then current value is supplied to single-chip microcomputer, current signal receiving circuit 7 also can be received to wirelessly by wired mode received current signal.When certain phase firewire overload makes electric current exceed set point, single-chip microcomputer is first to needing the phase line disconnected to export corresponding low level signal, namely single-chip microcomputer first outputs signal control drive circuit, drive circuit drives the switch in this phase line to disconnect this phase line, after guaranteeing that this phase line disconnects, export high level again and trigger the phase needing conducting, namely single-chip microcomputer outputs signal control drive circuit again, and drive circuit controls the phase line that driving switch conducting needs to connect.
Drive singal is input to single-chip microcomputer 3 by feedback circuit 5 again simultaneously, must guarantee that when phase line carries out commutation original phase line first cuts off the phase line of ability conducting needs connection, feedback circuit 5 is just for single-chip microcomputer 3 provides the drive singal of current each phase, each phase drive singal that drive circuit 4 exports is input to single-chip microcomputer 3 by feedback circuit 5, after single-chip microcomputer 3 receives drive singal, after confirming that the phase line of overload is cut off, then export the phase line of control signal conducting needs connection.If closed after adopting first conducting, will cause short circuit between phase line, consequence is very serious.
Be that example is described as Fig. 2 chooses a certain phase line; current transformer G monitors the electric leakage between conducting phase and zero line; if there is drain conditions; leakage current is input to single-chip microcomputer after being amplified by operational amplification circuit OP1 and OP2, and single-chip microcomputer just can detect leakage current thus carry out earth leakage protective to circuit.
When three-phase current detection circuit 8 detects that the electric current of a certain phase exceedes set point, namely the overload in this phase, now need first to disconnect the switch in this phase, connect the switch in an other phase again, receive other one by load to get on mutually, bidirectional thyristor K in Fig. 2 is set in three-phase the electronic switch needing conducting phase, adopts bidirectional thyristor as electronic AC switch of the present invention herein.After single-chip microcomputer receives the current value of three-phase current detection circuit 8 detection, judge to need phase inversion, the corresponding I/O port of single-chip microcomputer exports high level and drives triode Q, light-operated bidirectional triode thyristor MOC has zero crossing detection function, during triode Q saturation conduction, the light-emitting diode pipe end also conducting thereupon of light-operated bidirectional triode thyristor MOC, the secondary of light-operated bidirectional triode thyristor MOC exports triggering signal conducting bidirectional thyristor K bidirectional thyristor after voltage zero-cross detects.So just phase inversion is carried out in electricity consumption, thus load has been forwarded in an other phase mutually from originally overweight.
When current overload in this phase, need to turn off certain phase power supply, according in like manner, the corresponding I/O port output low level of single-chip microcomputer, triode Q base stage loses trigger current, and triode ends.Light-operated bidirectional triode thyristor MOC also ends thereupon, thus the bidirectional thyristor in this phase line turns off, and has cut off this phase power supply.
When the electric leakage signal that zero sequence current mutual inductor detects exceedes set point; single-chip microcomputer is by automatic triggered interrupts program; so single-chip microcomputer corresponding I/O port output low level cut-off triode Q and light-operated bidirectional triode thyristor MOC; bidirectional thyristor in three phase lines all will turn off, and play the protective effect to electricity consumption.
Resistance R13, electric capacity C2 form RC buffer circuit and piezo-resistance R14 can protect bidirectional thyristor.Adding of RC buffer circuit is electric current and voltage climbing in order to suppress during bidirectional thyristor switch
Parameters such as (du/dt and di/dt), guarantees the safety switch of bidirectional thyristor.While improving devices switch track, RC buffer circuit can control EMI, also lowers electric current and voltage stress, thus reduces switching loss, maximally utilises electronic switch characteristic, gives full play to the usefulness of electronic switch.
Experience is struck by lightning and circuit usually can produce very high surge voltage when on-off inductive load or bulk loads, and surge voltage can cause damage to electronic switch.At this moment piezo-resistance R14 embodies his clamping performance, can carry out clamper suppression, too high voltage is dragged down, allow late-class circuit be operated in the scope of a safety, thus play a protective role to bidirectional thyristor switch lightning overvoltage and switching overvoltage.
Because bidirectional thyristor about has the conduction voltage drop of 1.5V when conducting, puncture testing circuit can detect the situation that punctures of bidirectional thyristor so utilize.As Fig. 3, diode D2, D3 have the unidirectional general character, the pressure drop of bidirectional thyristor two ends is inputted by diode D2, D3 of one-way conduction, then is input to computing circuit by divider resistance R15, R16 and R17, R18 by after the conduction voltage drop dividing potential drop of bidirectional thyristor.Filter capacitor C2, C3 play low-pass filtering effect, reduce the false triggering because voltage instability occurs.Two operational amplifiers OP3, OP4 form differential amplifier circuit, and the voltage of operational amplifier OP4 output is at about 4V under normal circumstances, and this voltage is input to the anode of comparator OP5 input.Then compared by the bias potential of comparator OP5 and biasing resistor R24, R25, comparator OP5 exports high level, and Light-Emitting Diode D1 does not work.When there is breakdown fault, bidirectional thyristor two ends present pass-through state, make conduction voltage drop be zero.Now by after differential amplifier circuit, the output of operational amplifier OP4 close to 0V, then compares effect through comparator OP5, and comparator OP5 output low level, light-emitting diode D1 lights indication and there occurs breakdown fault.
Claims (4)
1. the earth leakage protective device with phase line handoff functionality, it is characterized in that: comprise current transformer and three-phase current detection circuit, current transformer is for detecting leakage current and exporting electric leakage signal, current transformer output connects amplifying circuit, amplifying circuit is input to single-chip microcomputer after amplifying described electric leakage signal, described three-phase current detection circuit connects current signal receiving circuit, current signal receiving circuit is for receiving three-phase current signal, the three-phase current signal input single-chip microcomputer that current signal receiving circuit will receive, the output of single-chip microcomputer connects drive circuit, drive circuit drives the switch be connected in triple line, the output of drive circuit is connected to the input of single-chip microcomputer by feedback circuit, the drive singal of drive circuit output is input to single-chip microcomputer by feedback circuit, when the electric current of certain phase line exceedes set point, single-chip microcomputer output signal controls drive circuit, drive circuit driving switch turn-off current exceedes the phase line of set point, then single-chip microcomputer outputs signal control drive circuit again, drive circuit controls the phase line that driving switch conducting needs to connect, the drive singal of drive circuit output is input to single-chip microcomputer by described feedback circuit, after single-chip microcomputer receives the cut-out of drive singal confirmation phase line, conducting needs the phase line of connection again, described switch adopts bidirectional thyristor switch, described bidirectional thyristor switch is connected with and punctures testing circuit, puncture the input that testing circuit is connected to single-chip microcomputer, the described testing circuit that punctures comprises the conducting unilateral diode D2 be connected in bidirectional thyristor switch ends, D3, diode D2 is by divider resistance R15, R16, diode D3 is by divider resistance R17, operational amplifier OP3 is connected respectively to after R18, OP4, operational amplifier OP3, OP4 forms differential amplifier circuit, the output of operational amplifier OP4 connects comparator OP5 anode, comparator OP5 negative terminal is connected with biasing resistor R24, R25, comparator OP5 output connecting luminous diode D1.
2. a kind of earth leakage protective device with phase line handoff functionality according to claim 1; it is characterized in that: described drive circuit comprises the triode Q be connected with single-chip microcomputer output; triode Q connects light-operated bidirectional triode thyristor, and light-operated bidirectional triode thyristor connects bidirectional thyristor switch.
3. a kind of earth leakage protective device with phase line handoff functionality according to claim 2, is characterized in that: described bidirectional thyristor switch connects the buffer protection circuit be made up of resistance R13, electric capacity C2.
4. a kind of earth leakage protective device with phase line handoff functionality according to claim 3, is characterized in that: described bidirectional thyristor switch is connected with piezo-resistance R14.
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| CN201210088012.5A CN102623947B (en) | 2012-03-29 | 2012-03-29 | A kind of earth leakage protective device with phase line handoff functionality |
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| CN201210088012.5A CN102623947B (en) | 2012-03-29 | 2012-03-29 | A kind of earth leakage protective device with phase line handoff functionality |
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| CN102623947B true CN102623947B (en) | 2015-09-23 |
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| CN107069659B (en) * | 2017-04-05 | 2019-11-22 | 国网福建省电力有限公司 | A kind of earth leakage protective device |
| CN108400606A (en) * | 2018-05-09 | 2018-08-14 | 上力电力科技有限公司 | A kind of three-phase residual current automatic balancing circuit |
| CN109617011B (en) * | 2018-11-29 | 2020-01-31 | 杭州电子科技大学 | high-voltage direct-current solid-state relay circuit with leakage protection |
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