CN108270206A - A kind of anti-overstep tripping guard method and device - Google Patents
A kind of anti-overstep tripping guard method and device Download PDFInfo
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- CN108270206A CN108270206A CN201611263230.2A CN201611263230A CN108270206A CN 108270206 A CN108270206 A CN 108270206A CN 201611263230 A CN201611263230 A CN 201611263230A CN 108270206 A CN108270206 A CN 108270206A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
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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
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Abstract
The embodiment of the invention discloses a kind of anti-overstep tripping guard method and device, the method includes：When the digital control terminal of this grade of circuit detects that short trouble occurs for this grade of circuit, generation trip signal indicates that the breaker of this grade of circuit trips；Also, the digital control terminal of superior circuit sends cascade signal and indicates that the digital control end delay of higher level's circuit judges that described grade circuit whether there is short trouble.The digital control end delay of higher level's circuit is made to judge that this grade of circuit whether there is short trouble by cascade signal, prevent the phenomenon that multi-level pmultistage circuit trips simultaneously when there is short trouble, the range of failure generation is reduced, is repaired convenient for staff, improves the safety of low-voltage distribution system.
Description
Technical field
The present embodiments relate to technical field of electric equipment more particularly to a kind of anti-overstep tripping guard method and dresses
It puts.
Background technology
Low-voltage distribution system is commonly used in the transmission voltage of power grid being reduced to distribution voltage, will be low using distribution transformer
Piezoelectricity is conveyed to low-voltage distribution apparatus.Including low-voltage circuit breaker in low-voltage distribution system, low-voltage circuit breaker is also known as automatic switch,
It is a kind of existing manual switch effect, and can carry out the electric appliance of decompression, under-voltage, overload and short-circuit protection automatically.
Existing low-voltage distribution system is generally divided into three-level power distribution circuit, and corresponding low pressure open circuit is equipped in every grade of circuit
Device, it is specific to be matched using operation curve between the superior and the subordinate come the tripping that prevents from bypassing the immediate leadership, but there are low precisions for existing low-voltage circuit breaker
The problem of discreteness is high, the big low precision of error that anti-overstep tripping is caused to be protected.
During the embodiment of the present invention is realized, inventor has found the prior art, and at least there are following defects：Existing skill
There are the big low precisions of error for anti-overstep tripping protection in art, it is impossible to the problem of effectively providing protection for circuit.
Invention content
The embodiment of the present invention is designed to provide a kind of anti-overstep tripping guard method and device, to solve the prior art
In anti-overstep tripping protection there are the big low precisions of error, it is impossible to effectively the problem of providing protection for circuit.
The first aspect of the embodiment of the present invention provides a kind of anti-overstep tripping guard method, including：When this grade of circuit
When digital control terminal detects that short trouble occurs for this grade of circuit, generation trip signal indicates that the breaker of this grade of circuit carries out
Tripping；Also, the digital control terminal of superior circuit sends the digital control terminal that cascade signal indicates higher level's circuit
Delay judges that described grade circuit whether there is short trouble.
Preferably, the method further includes：After setting time is postponed, when the digital control terminal of higher level's circuit is examined
Described grade circuit is measured there are during short circuit current, generation trip signal indicates that the breaker of higher level's circuit trips.
Preferably, the method further includes：When the digital control terminal of higher level's circuit does not receive described grade electricity
During the cascade signal that the digital control terminal on road is sent, generation trip signal indicates that the breaker of higher level's circuit is jumped
Lock.
Preferably, the condition that short trouble occurs for described grade circuit meets at least one of：Described grade circuit
Continuous m instantaneous current value is more than the current threshold of setting；The variation slope value of the continuous n sample rate current of described grade circuit
More than the slope threshold value of setting；Wherein, m and n is integer, and 1<m<64,1<n<64.
Preferably, the instantaneous current value determines in the following manner：The described grade electricity that will be acquired every time interval T
The electric current on road is converted to digital signal and takes its absolute value as sampled current value；Based on the sampled current value and no-load voltage ratio coefficient
Determine instantaneous current value；The variation slope value of the sample rate current determines in the following manner：Based on adjacent sampling electricity twice
Flow valuve determines the variation slope value of the sample rate current.
The second aspect of the embodiment of the present invention provides a kind of anti-overstep tripping protective device, including：First tripping judges
Module, for when the digital control terminal of this grade of circuit detects that short trouble occurs for this grade of circuit, generation trip signal to refer to
Show that the breaker of this grade of circuit trips；Signal transmitting module sends cascade for the digital control terminal of superior circuit
The digital control end delay of higher level's circuit described in signal designation judges that described grade circuit whether there is short trouble.
Preferably, described device further includes：Second tripping judgment module, for after setting time is postponed, on described
The digital control terminal of grade circuit detects described grade circuit there are during short circuit current, and generation trip signal indicates the higher level
The breaker of circuit trips.
Preferably, described device further includes：Third tripping judgment module, for working as the digital control end of higher level's circuit
During the cascade signal that the digital control terminal that end does not receive described grade circuit is sent, generation trip signal indicates the higher level
The breaker of circuit trips.
Preferably, the condition that short trouble occurs for described grade circuit meets at least one of：Described grade circuit
Continuous m instantaneous current value is more than the current threshold of setting；The variation slope value of the continuous n sample rate current of described grade circuit
More than the slope threshold value of setting；Wherein, m and n is integer, and 1<m<64,1<n<64.
Preferably, described device further includes：Determining module, for determining the instantaneous current value in the following manner：It will
Electric current every described grade circuit of time interval T acquisitions is converted to digital signal and takes its absolute value as sample rate current
Value；Instantaneous current value is determined based on the sampled current value and no-load voltage ratio coefficient；And for determining described adopt in the following manner
The variation slope value of sample electric current：The variation slope value of the sample rate current is determined based on adjacent sampled current value twice.
Anti-overstep tripping guard method provided in an embodiment of the present invention and device, by the digital control end for working as this grade of circuit
When end detects that short trouble occurs for this grade of circuit, generation trip signal indicates that the breaker of this grade of circuit trips, and to
The digital control terminal of higher level's circuit sends cascade signal and indicates described in the digital control end delay judgement of higher level's circuit
This grade of circuit whether there is short trouble.The digital control end delay for making higher level's circuit by cascade signal judges this grade of circuit
With the presence or absence of short trouble, the phenomenon that multi-level pmultistage circuit trips simultaneously when there is short trouble is prevented, reduces failure generation
Range repairs convenient for staff, improves the safety of low-voltage distribution system.
Description of the drawings
Fig. 1 is a kind of step flow chart for anti-overstep tripping guard method that the embodiment of the present invention one provides；
Fig. 2 is the schematic diagram of mesolow power distribution circuit of the embodiment of the present invention；
Fig. 3 is a kind of step flow chart of anti-overstep tripping guard method provided by Embodiment 2 of the present invention；
Fig. 4 is a kind of structure diagram for anti-overstep tripping protective device that the embodiment of the present invention three provides；
Fig. 5 is a kind of structure diagram for anti-overstep tripping protective device that the embodiment of the present invention four provides.
Specific embodiment
(identical label represents identical element in several attached drawings) and embodiment below in conjunction with the accompanying drawings, implement the present invention
The specific embodiment of example is described in further detail.Following embodiment is used to illustrate the embodiment of the present invention, but be not limited to
The range of the embodiment of the present invention.
It will be understood by those skilled in the art that the terms such as " first ", " second " in the embodiment of the present invention are only used for distinguishing
Different step, equipment or module etc. neither represent any particular technology meaning, also do not indicate that the inevitable logic between them is suitable
Sequence.
Anti-overstep tripping guard method provided in an embodiment of the present invention, suitable for low-voltage distribution system, there are during short trouble
There is the situation of tripping of bypassing the immediate leadership, it can be using digital control terminal as the executive agent of the embodiment of the present invention.
Embodiment one
With reference to Fig. 1, a kind of step flow chart for anti-overstep tripping guard method that the embodiment of the present invention one provides is shown,
Specifically it may include steps of：
Step 102, when the digital control terminal of this grade of circuit A detects that short trouble occurs for this grade of circuit A, generation is jumped
The breaker of this grade of circuit A of lock signal designation trips.
Step 104, the digital control terminal of superior circuit B send the digital control of cascade signal instruction higher level's circuit B
End delay judges that this grade of circuit A whether there is short trouble.
In the low-voltage distribution system of the embodiment of the present invention, low voltage distribution circuit is divided into three-level, with reference to Fig. 2, shows low
The schematic diagram of power distribution circuit is pressed, including stage circuit, secondary circuit and three-level circuit, every grade of power distribution circuit is provided with digital control
Terminal and breaker, wherein, three-level circuit can judge that this grade of circuit whether there is short trouble by digital control terminal, specifically
It may include：Digital control terminal acquires the current signal in the power distribution circuit measured by current transformer, and passes through the electric current and believe
This grade of circuit number is judged with the presence or absence of short trouble, wherein, the digital control terminal of firsts and seconds circuit can acquire this grade
The current signal that circuit or subordinate's current transformer measure, and judge this grade of circuit and subordinate's circuit with the presence or absence of short circuit based on this
Failure.In the present embodiment, circuit A can be three-level circuit or secondary circuit；Circuit B can be corresponding two level electricity
Road or stage circuit.
The embodiment of the present invention, using the scheme of delay judgement, is specifically included to prevent tripping of bypassing the immediate leadership：When this grade of circuit A's
When digital control terminal detects that short trouble occurs for this grade of circuit A, generation trip signal indicate the breaker of this grade of circuit A into
Row tripping, and the digital control terminal of superior circuit B sends cascade signal and indicates that the digital control terminal of higher level's circuit B is prolonged
Slow setting time judges that this grade of circuit A whether there is short trouble.
Such as, when the digital control terminal of secondary circuit detects that short trouble occurs for the somewhere of secondary circuit, two level electricity
The breaker of the digital control terminal generation trip signal instruction secondary circuit on road trips, and the number control of secondary circuit
Terminal processed sends cascade signal to the digital control terminal of stage circuit, and the digital control terminal of stage circuit receives cascade letter
After number, delay setting time judges that secondary circuit whether there is the digital control end delay of short trouble, for another example stage circuit
1-80ms judges that secondary circuit whether there is short trouble.
Anti-overstep tripping guard method provided in an embodiment of the present invention is detected by the digital control terminal for working as this grade of circuit
When short trouble occurs to this grade of circuit, generation trip signal indicates that the breaker of this grade of circuit trips, and superior electricity
The digital control end delay that the digital control terminal on road sends cascade signal instruction higher level's circuit judges whether this grade of circuit is deposited
In short trouble.The digital control end delay of higher level's circuit is made to judge this grade of circuit with the presence or absence of short circuit event by cascade signal
Barrier prevents the phenomenon that multi-level pmultistage circuit trips simultaneously when there is short trouble, the range of failure generation is reduced, convenient for work people
Member's repair, improves the safety of low-voltage distribution system.
Embodiment two
With reference to Fig. 3, a kind of step flow chart of anti-overstep tripping guard method provided by Embodiment 2 of the present invention is shown,
Specifically it may include steps of：
Step 302, when the digital control terminal of this grade of circuit B detects that short trouble occurs for this grade of circuit B, generation is jumped
The breaker of this grade of circuit B of lock signal designation trips.
With reference to Fig. 2, every grade of circuit is respectively provided with digital control terminal and breaker, and every grade of digital control terminal passes through difference
Signal wire connection communication, is both provided with corresponding current transformer in every grade of circuit, and current transformer is measured in this grade of circuit
Current signal, digital control terminal-pair current signal the processing such as is acquired, converts and calculates, and e.g., digital control terminal is every
Current signal is acquired, and be converted into digital signal and take its absolute value as sampled current value every time interval T；Based on sampling
Current value and no-load voltage ratio coefficient determine the instantaneous current value of current signal in this grade of circuit, when digital control terminal judges this grade of circuit
Continuous m instantaneous current value when being more than the current threshold of setting, it is determined that short trouble, generation tripping letter occur for this grade of circuit
Number indicate that the breaker of this grade of circuit trips, wherein, sampling interval T can be the 1/64 of a cycle time, such as when frequency
When rate is 50hz, time of a cycle is 20ms, and sampling interval T is 0.3125ms, 1<m<64, and m is integer, if m is 6.
In a kind of alternative of the embodiment of the present invention, it is also based on adjacent sampled current value twice and determines to sample
The variation slope value of electric current, when digital control terminal judges that the variation slope value of the continuous n sample rate current of this grade of circuit is more than
During the slope threshold value of setting, generation trip signal indicates that the breaker of this grade of circuit trips, wherein, 1<n<64, and n is whole
Number, if n is 5.
When the electric current of circuit meets above two Rule of judgment for the moment, the digital control terminal of this grade of circuit can be 2
Short trouble is judged, and trip operation is carried out by breaker in time in millisecond.
Step 304, the digital control terminal of superior circuit C send the digital control of cascade signal instruction higher level's circuit C
End delay judges that this grade of circuit B whether there is short trouble.If the digital control terminal of higher level's circuit C receives cascade signal
When, then step 306 is performed, if the digital control terminal of higher level's circuit C does not receive cascade signal, performs step 308.
In embodiments of the present invention, when this grade of circuit B detects that short trouble occurs for this grade of circuit B, grade can also be generated
Connection signal (cascade signal is to represent that the signal of short trouble occurs for this grade of circuit), and pass through the digital control end of this grade of circuit B
End sends the digital control terminal of cascade signal superior circuit C, the digital control terminal of cascade signal instruction higher level's circuit C
Judge that this grade of circuit B whether there is short trouble after delay setting time.
Step 306, after setting time is postponed, this grade of circuit B is detected with the presence or absence of short circuit current, if in the presence of performing
Step 308, otherwise terminate this flow.
When the digital control terminal of higher level's circuit C receives the cascade signal of the digital control terminal transmission of this grade of circuit B
Afterwards, delay setting time (such as 1-80ms), digital control terminal acquire the electric current in this grade of circuit B measured by current transformer
Signal, and pass through the current signal and judge that this grade of circuit B whether there is short trouble.
Step 308, generation trip signal indicate that the breaker of higher level's circuit C trips.
The breaker of higher level's circuit C carries out tripping and includes two kinds of conditions, specific as follows：
When short trouble occurs for this grade of circuit B, and the digital control terminal of higher level's circuit C does not receive cascade signal,
The breaker of generation trip signal instruction higher level's circuit C trips.
After the digital control terminal of higher level's circuit C receives cascade signal, postpone setting time, detect this grade of circuit
There are still during short circuit current, the breaker of generation trip signal instruction higher level's circuit C trips B.
Anti-overstep tripping guard method provided in an embodiment of the present invention is detected by the digital control terminal for working as this grade of circuit
When short trouble occurs to this grade of circuit, generation trip signal indicates that the breaker of this grade of circuit trips, and reduces failure
The range of generation repairs convenient for staff, improves the safety of low-voltage distribution system, and superior circuit is digital control
The digital control end delay that terminal sends cascade signal instruction higher level's circuit judges that this grade of circuit whether there is short trouble.If
When the digital control terminal of higher level's circuit does not receive cascade signal, the breaker of generation trip signal instruction higher level's circuit is jumped
Lock；After if the digital control terminal of higher level's circuit receives cascade signal, postpone setting time, detecting this grade of circuit, there are still short
During the electric current of road, the breaker of generation trip signal instruction higher level's circuit trips.Make the number of higher level's circuit by cascade signal
The delay of word control terminal judges that this grade of circuit whether there is short trouble, prevents the multi-level pmultistage circuit when there is short trouble from jumping simultaneously
The phenomenon that lock, reduces the range of failure generation, is repaired convenient for staff, improves the safety of low-voltage distribution system, when
When the digital control terminal of higher level's circuit does not receive cascade signal, the breaker of generation trip signal instruction higher level's circuit is jumped
Lock reduces the generation of low-voltage distribution system failure.
It will be understood by those skilled in the art that in the above method of specific embodiment of the embodiment of the present invention, each step
Serial number size be not meant to the priority of execution sequence, the execution sequence of each step should be determined with its function and internal logic,
Implementation process without coping with specific embodiment of the embodiment of the present invention forms any restriction.
Embodiment three
With reference to Fig. 4, a kind of structure diagram for anti-overstep tripping protective device that the embodiment of the present invention three provides, tool are shown
Body can include following module：
First tripping judgment module 402, it is short that the digital control terminal for working as this grade of circuit detects that this grade of circuit occurs
During the failure of road, generation trip signal indicates that the breaker of this grade of circuit trips.
Signal transmitting module 404 sends cascade signal instruction higher level's circuit for the digital control terminal of superior circuit
Digital control end delay judge this grade of circuit whether there is short trouble.
Anti-overstep tripping protective device provided in an embodiment of the present invention is detected by the digital control terminal for working as this grade of circuit
When short trouble occurs to this grade of circuit, generation trip signal indicates that the breaker of this grade trips, and superior circuit
The digital control end delay that digital control terminal sends cascade signal instruction higher level's circuit judges this grade of circuit with the presence or absence of short
Road failure.The digital control end delay of higher level's circuit is made to judge that this grade of circuit whether there is short trouble by cascade signal,
The phenomenon that multi-level pmultistage circuit trips simultaneously when there is short trouble is prevented, the range of failure generation is reduced, convenient for staff
Repair, improves the safety of low-voltage distribution system.
Example IV
With reference to Fig. 5, a kind of structure diagram for anti-overstep tripping protective device that the embodiment of the present invention four provides, tool are shown
Body can include following module：
First tripping judgment module 402, it is short that the digital control terminal for working as this grade of circuit detects that this grade of circuit occurs
During the failure of road, generation trip signal indicates that the breaker of this grade of circuit trips.
Determining module 410, for determining instantaneous current value in the following manner：This grade that will be acquired every time interval T
The electric current of circuit is converted to digital signal and takes its absolute value as sampled current value；It is true based on sampled current value and no-load voltage ratio coefficient
Determine instantaneous current value；And the variation slope value for determining sample rate current in the following manner：Based on adjacent sampling twice
Current value determines the variation slope value of sample rate current.
Wherein, the condition that short trouble occurs for this grade of circuit meets at least one of：Continuous m of this grade of circuit are instantaneous
Current value is more than the current threshold of setting；The variation slope value of the continuous n sample rate current of this grade of circuit is more than the slope of setting
Threshold value；Wherein, m and n is integer, and 1<m<64,1<n<64.
Signal transmitting module 404 sends cascade signal instruction higher level's circuit for the digital control terminal of superior circuit
Digital control end delay judge this grade of circuit whether there is short trouble.
Second tripping judgment module 406, for after setting time postpone, when the digital control terminal detection of higher level's circuit
To this grade of circuit there are during short circuit current, the breaker of generation trip signal instruction higher level's circuit trips.
Third tripping judgment module 408, the digital control terminal for working as higher level's circuit do not receive the number of this grade of circuit
During the cascade signal that word control terminal is sent, the breaker of generation trip signal instruction higher level's circuit trips.
Anti-overstep tripping protective device provided in an embodiment of the present invention is detected by the digital control terminal for working as this grade of circuit
When short trouble occurs to this grade of circuit, generation trip signal indicates that the breaker of this grade trips, and reduces failure
Range, convenient for staff repair, improve the safety of low-voltage distribution system, and the digital control terminal of superior circuit
The digital control end delay for sending cascade signal instruction higher level's circuit judges that this grade of circuit whether there is short trouble.If higher level
When the digital control terminal of circuit does not receive cascade signal, the breaker of generation trip signal instruction higher level's circuit trips；
After if the digital control terminal of higher level's circuit receives cascade signal, postpone setting time, detecting this grade of circuit, there are still short circuits
During electric current, the breaker of generation trip signal instruction higher level's circuit trips.Make the number of higher level's circuit by cascade signal
Control terminal delay judges that this grade of circuit whether there is short trouble, prevents the multi-level pmultistage circuit when there is short trouble from tripping simultaneously
The phenomenon that, reduce the range of failure generation, repaired convenient for staff, the safety of low-voltage distribution system is improved, when upper
When the digital control terminal of grade circuit does not receive cascade signal, the breaker of generation trip signal instruction higher level's circuit is jumped
Lock reduces the generation of low-voltage distribution system failure.
It may be noted that according to the needs of implementation, all parts/step described in the embodiment of the present invention can be split as more
The part operation of two or more components/steps or components/steps can be also combined into new component/step by multi-part/step
Suddenly, to realize the purpose of the embodiment of the present invention.
It is above-mentioned to realize or be implemented as in hardware, firmware according to the method for the embodiment of the present invention to be storable in note
Software or computer code in recording medium (such as CD ROM, RAM, floppy disk, hard disk or magneto-optic disk) are implemented through net
The original storage that network is downloaded is in long-range recording medium or nonvolatile machine readable media and will be stored in local recording medium
In computer code, can be stored in using all-purpose computer, application specific processor or can compile so as to method described here
Such software processing in journey or the recording medium of specialized hardware (such as ASIC or FPGA).It is appreciated that computer, processing
Device, microprocessor controller or programmable hardware include can storing or receive software or computer code storage assembly (for example,
RAM, ROM, flash memory etc.), when software or computer code are by computer, processor or hardware access and when performing, realize herein
The anti-overstep tripping protection processing method of description.In addition, when all-purpose computer access is used to implement the anti-jump of bypassing the immediate leadership being shown here
During the code of lock protection processing, the execution of code is converted to all-purpose computer to be protected for performing the anti-overstep tripping being shown here
Protect the special purpose computer of processing.
Those of ordinary skill in the art may realize that each exemplary lists described with reference to the embodiments described herein
Member and method and step can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is performed with hardware or software mode, specific application and design constraint depending on technical solution.Professional technician
Described function can be realized using distinct methods to each specific application, but this realization is it is not considered that exceed
The range of the embodiment of the present invention.
Embodiment of above is merely to illustrate the embodiment of the present invention, and is not the limitation to the embodiment of the present invention, related skill
The those of ordinary skill in art field in the case where not departing from the spirit and scope of the embodiment of the present invention, can also make various
Variation and modification, therefore all equivalent technical solutions also belong to the scope of the embodiment of the present invention, the patent of the embodiment of the present invention
Protection domain should be defined by the claims.
Claims (10)
1. a kind of anti-overstep tripping guard method, which is characterized in that including：
When the digital control terminal of this grade of circuit detects that short trouble occurs for this grade of circuit, generation trip signal indicates this grade
The breaker of circuit trips；
Also, the digital control terminal of superior circuit sends cascade signal and indicates that the digital control terminal of higher level's circuit is prolonged
Judge that described grade circuit whether there is short trouble late.
2. according to the method described in claim 1, it is characterized in that, the method further includes：
After setting time is postponed, when the digital control terminal of higher level's circuit detects that described grade circuit has short circuit electricity
During stream, generation trip signal indicates that the breaker of higher level's circuit trips.
3. according to the method described in claim 1, it is characterized in that, the method further includes：
When the digital control terminal of higher level's circuit does not receive the cascade of the digital control terminal transmission of described grade circuit
During signal, generation trip signal indicates that the breaker of higher level's circuit trips.
4. according to the method described in claim 1, it is characterized in that, described grade circuit occur short trouble condition meet with
It is at least one lower：
The continuous m instantaneous current value of described grade circuit is more than the current threshold of setting；
The variation slope value of the continuous n sample rate current of described grade circuit is more than the slope threshold value of setting；
Wherein, m and n is integer, and 1<m<64,1<n<64.
5. according to the method described in claim 4, it is characterized in that, the instantaneous current value determines in the following manner：
The electric current of described grade circuit acquired every time interval T is converted into digital signal and takes its absolute value as sampling
Current value；
Instantaneous current value is determined based on the sampled current value and no-load voltage ratio coefficient；
The variation slope value of the sample rate current determines in the following manner：
The variation slope value of the sample rate current is determined based on adjacent sampled current value twice.
6. a kind of anti-overstep tripping protective device, which is characterized in that including：
First tripping judgment module, the digital control terminal for working as this grade of circuit detect that short trouble occurs for this grade of circuit
When, generation trip signal indicates that the breaker of this grade of circuit trips；
Signal transmitting module sends the number of cascade signal instruction higher level's circuit for the digital control terminal of superior circuit
The delay of word control terminal judges that described grade circuit whether there is short trouble.
7. device according to claim 6, which is characterized in that described device further includes：
Second tripping judgment module, for after setting time is postponed, when the digital control terminal of higher level's circuit detects
For described grade circuit there are during short circuit current, generation trip signal indicates that the breaker of higher level's circuit trips.
8. device according to claim 6, which is characterized in that described device further includes：
Third tripping judgment module, the digital control terminal for working as higher level's circuit do not receive the number of described grade circuit
During the cascade signal that word control terminal is sent, generation trip signal indicates that the breaker of higher level's circuit trips.
9. device according to claim 6, which is characterized in that described grade circuit occur short trouble condition meet with
It is at least one lower：
The continuous m instantaneous current value of described grade circuit is more than the current threshold of setting；
The variation slope value of the continuous n sample rate current of described grade circuit is more than the slope threshold value of setting；
Wherein, m and n is integer, and 1<m<64,1<n<64.
10. device according to claim 9, which is characterized in that described device further includes：
Determining module, for determining the instantaneous current value in the following manner：The described grade that will be acquired every time interval T
The electric current of circuit is converted to digital signal and takes its absolute value as sampled current value；Based on the sampled current value and no-load voltage ratio system
The determining instantaneous current value of number；And the variation slope value for determining the sample rate current in the following manner：Based on adjacent two
Secondary sampled current value determines the variation slope value of the sample rate current.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611263230.2A CN108270206A (en) | 2016-12-30 | 2016-12-30 | A kind of anti-overstep tripping guard method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611263230.2A CN108270206A (en) | 2016-12-30 | 2016-12-30 | A kind of anti-overstep tripping guard method and device |
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| CN201611263230.2A Pending CN108270206A (en) | 2016-12-30 | 2016-12-30 | A kind of anti-overstep tripping guard method and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110890745A (en) * | 2018-09-10 | 2020-03-17 | 上海颐坤自动化控制设备有限公司 | Override trip prevention control system |
| CN111313388A (en) * | 2020-04-20 | 2020-06-19 | 泉州七星电气有限公司 | Override trip prevention method for switching station |
| CN111555250A (en) * | 2020-05-28 | 2020-08-18 | 天津市中力神盾电子科技有限公司 | Override trip prevention protection method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111313388A (en) * | 2020-04-20 | 2020-06-19 | 泉州七星电气有限公司 | Override trip prevention method for switching station |
| CN111555250A (en) * | 2020-05-28 | 2020-08-18 | 天津市中力神盾电子科技有限公司 | Override trip prevention protection method and device |
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