CN110133489B - Simulated fault applying method and system for single-phase earth fault of primary-secondary fusion complete set of pole circuit breaker - Google Patents
Simulated fault applying method and system for single-phase earth fault of primary-secondary fusion complete set of pole circuit breaker Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
Abstract
The invention provides a method and a system for applying a simulated fault of a single-phase earth fault of a circuit breaker on a primary and secondary fusion complete set of columns, wherein the method comprises the steps of selecting a three-phase current channel and a three-phase voltage channel on a multi-channel waveform generator; setting three-phase current and voltage waveforms before a fault; setting three-phase current and voltage waveforms after a fault; correspondingly connecting the output end of the multi-channel waveform generator to a multi-channel linear amplifier; correspondingly and respectively connecting the output end of the multi-channel linear amplifier into a three-phase high-precision current booster and a three-phase high-precision voltage booster; and respectively connecting the output ends of the three-phase high-precision current booster and the three-phase high-precision voltage booster into a primary side of a current transformer and a primary side of a voltage transformer of a circuit breaker on a secondary fusion set column, and completing the application of the simulation fault of the single-phase earth fault. The application of single-phase earth fault can be simulated by sinusoidal current and voltage waveform of different phases and amplitudes, and the detection requirement of single-phase earth fault of the circuit breaker on the primary and secondary integration set column is met.
Description
Technical Field
The invention relates to the field of circuit breaker detection, in particular to a method and a system for applying a simulated fault of a single-phase earth fault of a circuit breaker on a primary-secondary fusion complete set of columns.
Background
With the rapid development of economy and the continuous increase of power supply amount in China, particularly the increasingly strengthened dependence of various customers on electric power, in order to improve the power supply reliability of a power grid, pole-mounted circuit breakers are often used for connection, segmentation and branch lines in the power grid so as to improve the power supply reliability of the power grid.
The requirement for the protection function of the circuit breaker on the primary and secondary integrated complete column is as follows: (1) the operation parameters and the control logic can be flexibly configured according to the actual operation condition, and single-phase grounding and interphase short-circuit fault processing is realized; (2) the device has the functions of detecting and protecting interphase short-circuit faults and single-phase earth faults of a low-resistance earth system, meets the two-section (I, II) alarm function, and can set two sections of fixed values and time; the protection may be set to trip or alarm; (3) the single-phase earth fault on-site judging and isolating function of the low-current grounding system is achieved, the earth fault on-site cutting, line selecting and reclosing functions are achieved, and the section selecting function based on centralized feeder automation is achieved. In order to meet the detection of the short-circuit protection function of the circuit breaker on the primary and secondary fusion complete set of columns, corresponding simulation faults need to be applied.
Disclosure of Invention
The invention aims to provide a method and a system for applying a simulation fault of a single-phase earth fault of a circuit breaker on a primary and secondary fusion complete set of columns, which meet the detection requirement of the single-phase earth fault of the circuit breaker on the primary and secondary fusion complete set of columns.
The technical scheme provided by the invention
A simulation fault applying method for a single-phase earth fault of a circuit breaker on a primary-secondary fusion complete set column comprises the following specific steps,
s1, selecting a three-phase current channel and a three-phase voltage channel on a multi-channel waveform generator;
s2, setting three-phase current and voltage waveforms before a fault;
s3, setting three-phase current and voltage waveforms after the fault;
s4, correspondingly connecting the output end of the multi-channel waveform generator to a multi-channel linear amplifier, and amplifying three-phase current and voltage waveforms before and after a fault;
s5, correspondingly and respectively connecting the output end of the multi-channel linear amplifier into a three-phase high-precision current booster and a three-phase high-precision voltage booster, and amplifying three-phase current and voltage waveforms before and after a fault;
and S6, respectively connecting the output ends of the three-phase high-precision current booster and the three-phase high-precision voltage booster into a primary side of a current transformer and a primary side of a voltage transformer of a breaker on a secondary fusion complete set column, and completing the application of the simulation fault of the single-phase earth fault.
And in the step S2, the current lags behind the voltage by 10 degrees, and a sampling device with the frequency of 50Hz, the time starting point of 0ms, the time ending point of 40ms and the sampling point of 2000 is arranged in all channels.
In the step S3, the phase current of the fault lags behind the phase voltage by 80 degrees, the phase current of the fault and the voltage are subjected to step change, the frequency of 50Hz, the time starting point by 40ms, the time ending point by 140ms and the sampling point by 2000 are set in all channels to obtain the sampling device.
In the step S4, a current amplification channel amplification ratio of 1:10 is set, and a voltage amplification channel amplification ratio of 1:100 is set.
In step S5, the current transformation ratio of the booster is set to 1:10, and the voltage transformation ratio of the booster is set to 1: 1000.
A simulation fault applying system for single-phase earth fault of a circuit breaker on a secondary fusion complete set column comprises a multi-channel waveform generator, a multi-channel linear amplifier, a three-phase high-precision current booster, a three-phase high-precision voltage booster and a circuit breaker on a secondary fusion complete set column,
the output end of the multi-channel waveform generator is connected to the multi-channel linear amplifier and is used for generating A, B, C three-phase current waveforms and A, B, C three-phase voltage waveforms and supplying A, B, C three-phase current waveforms and A, B, C three-phase voltage waveforms to the multi-channel linear amplifier;
the input end of the multi-channel linear amplifier is connected with the multi-channel waveform generator, the output end of the multi-channel linear amplifier is connected with the three-phase high-precision booster and the three-phase high-precision booster, the multi-channel linear amplifier amplifies A, B, C three-phase current waveforms and A, B, C three-phase voltage waveforms, the amplified A, B, C three-phase current waveforms are transmitted to the three-phase high-precision booster, and the amplified A, B, C three-phase voltage waveforms are transmitted to the three-phase high-precision booster;
the input end of the three-phase high-precision current booster is connected to the output end of the multi-channel linear amplifier, the output end of the three-phase high-precision current booster is connected to the primary side of a current transformer of a circuit breaker on a secondary fusion set column, and the three-phase high-precision current booster is used for boosting current amplified by the multi-channel linear amplifier and then transmitting the current to the primary side of the current transformer of the circuit breaker on the secondary fusion set column;
the input end of the three-phase high-precision booster is connected to the output end of the multi-channel linear amplifier, the output end of the three-phase high-precision booster is connected to the primary side of a voltage transformer of a secondary fusion on-column circuit breaker, and the three-phase high-precision booster is used for boosting current amplified by the multi-channel linear amplifier and then transmitting the current to the primary side of the voltage transformer of the secondary fusion on-column circuit breaker.
A sampling device with the frequency of 50Hz, the time starting point of 0ms, the time ending point of 40ms and the sampling point of 2000 is arranged in each linear amplification channel of the multi-channel linear amplifier.
And each linear amplification channel of the three-phase high-precision booster and the three-phase high-precision booster is internally provided with a sampling device with the frequency of 50Hz, the time starting point of 40ms, the time ending point of 140ms and the sampling point of 2000.
In the multi-channel linear amplifier, the amplification ratio of a current amplification channel is 1:10, and the amplification ratio of a voltage amplification channel is 1: 100.
The current transformation ratio of the three-phase high-precision booster is set to be 1:10, and the voltage transformation ratio of the three-phase high-precision booster is set to be 1: 1000.
The invention may have the following advantages: the application of single-phase earth fault can be simulated by sinusoidal current and voltage waveform of different phases and amplitudes, the operation is simple and convenient, and the detection requirement of single-phase earth fault of the circuit breaker on the primary-secondary fusion set column is met.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a system block diagram of the present invention;
fig. 3 is a single-phase earth fault waveform diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A simulation fault applying method for a single-phase earth fault of a circuit breaker on a primary-secondary fusion complete set column comprises the following specific steps,
s1, selecting a three-phase current channel and a three-phase voltage channel on a multi-channel waveform generator;
s2, setting three-phase current and voltage waveforms before a fault;
s3, setting three-phase current and voltage waveforms after the fault;
s4, correspondingly connecting the output end of the multi-channel waveform generator to a multi-channel linear amplifier, and amplifying three-phase current and voltage waveforms before and after a fault;
s5, correspondingly and respectively connecting the output end of the multi-channel linear amplifier into a three-phase high-precision current booster and a three-phase high-precision voltage booster, and amplifying three-phase current and voltage waveforms before and after a fault;
and S6, respectively connecting the output ends of the three-phase high-precision current booster and the three-phase high-precision voltage booster into a primary side of a current transformer and a primary side of a voltage transformer of a breaker on a secondary fusion complete set column, and completing the application of the simulation fault of the single-phase earth fault.
A simulation fault applying system for single-phase earth fault of a circuit breaker on a secondary fusion complete set column comprises a multi-channel waveform generator 1, a multi-channel linear amplifier 2, a three-phase high-precision current booster 3, a three-phase high-precision voltage booster 4 and a circuit breaker 5 on a secondary fusion complete set column,
the output end of the multi-channel waveform generator 1 is connected to the multi-channel linear amplifier 2 and is used for generating A, B, C three-phase current waveforms and A, B, C three-phase voltage waveforms and supplying A, B, C three-phase current waveforms and A, B, C three-phase voltage waveforms to the multi-channel linear amplifier 2;
the input end of the multi-channel linear amplifier 2 is connected with the multi-channel waveform generator 1, the output end of the multi-channel linear amplifier 2 is connected with the three-phase high-precision booster 3 and the three-phase high-precision booster 4, the multi-channel linear amplifier 2 amplifies A, B, C three-phase current waveforms and A, B, C three-phase voltage waveforms, the amplified A, B, C three-phase current waveforms are transmitted to the three-phase high-precision booster 3, and the amplified A, B, C three-phase voltage waveforms are transmitted to the three-phase high-precision booster 4;
the input end of the three-phase high-precision current booster 3 is connected to the output end of the multi-channel linear amplifier 2, the output end of the three-phase high-precision current booster 3 is connected to the primary side of a current transformer of the breaker 5 on the primary-secondary fusion complete set column, and the three-phase high-precision current booster 3 is used for boosting the current amplified by the multi-channel linear amplifier 2 and then transmitting the current to the primary side of the current transformer of the breaker 5 on the primary-secondary fusion complete set column;
the input end of the three-phase high-precision booster 4 is connected to the output end of the multi-channel linear amplifier 2, the output end of the three-phase high-precision booster 4 is connected to the primary side of a voltage transformer of the secondary fusion on-column circuit breaker 5, and the three-phase high-precision booster 4 is used for boosting the current amplified by the multi-channel linear amplifier 2 and then transmitting the current to the primary side of the voltage transformer of the secondary fusion on-column circuit breaker 5.
Suppose (1) that the fault-leading phase current lags the phase voltage by 10 degrees and the fault-trailing phase current lags the phase voltage by 80 degrees; (2) with 0ms as a time starting point, 40ms of A-phase single-phase earth fault occurs, 140ms of fault is finished, fig. 3 is a current-voltage waveform diagram of the single-phase earth fault, in the diagram, IA, IB and IC are A, B, C three-phase currents respectively, and UA, UB and UC are A, B, C three-phase voltages respectively.
Selecting a 6-channel signal generation mode on computer software of a multi-channel waveform generator, wherein channels 1-3 respectively represent A, B, C three-phase currents; channels 4-6 represent A, B, C three-phase voltages, respectively.
And setting three-phase current and voltage waveforms before the fault. The current lags behind the voltage by 10 degrees, the frequency of 50Hz, the time starting point of 0ms and the time ending point of 40ms are set in all channels, and the sampling device of the sampling point 2000 collects the current waveform and the voltage waveform.
Setting parameters in the A-phase current channel: phase 0 °; the amplitude is 50 mA;
setting parameters in an A phase voltage channel: phase-10 °; the amplitude is 100 mV;
setting parameters in a B-phase current channel: phase 120 °; the amplitude is 50 mA;
setting parameters in a B phase voltage channel: phase 110 °; the amplitude is 100 mV;
setting parameters in a C-phase current channel: phase-120 °; the amplitude is 50 mA;
setting parameters in a C-phase voltage channel: phase-130 °; the amplitude is 100 mV.
And setting three-phase current and voltage waveforms after the fault. The phase a current of the fault phase lags behind the voltage by 80 deg., and the current and voltage steps are abrupt. The sampling device, which sets the frequency of 50Hz, the time starting point of 40ms, the time ending point of 140ms and the sampling point 2000 in all channels, collects the current waveform and the voltage waveform.
Setting parameters in the A-phase current channel: phase 0 °; the amplitude is 200 mA;
setting parameters in an A phase voltage channel: phase-80 °; the amplitude is 20 mV;
setting parameters in a B-phase current channel: phase 120 °; the amplitude is 50 mA;
setting parameters in a B phase voltage channel: phase 110 °; the amplitude is 100 mV;
setting parameters in a C-phase current channel: phase-120 °; the amplitude is 50 mA;
setting parameters in a C-phase voltage channel: phase-130 °; the amplitude is 100 mV.
The output end of the multi-channel waveform generator is correspondingly connected into a multi-channel linear amplifier, a current amplification channel 1-3 is arranged for amplifying the ratio of 1:10, a voltage amplification channel 4-6 is arranged for amplifying the ratio of 1:100, and three-phase current and voltage waveforms before and after a fault are amplified.
Phase a current before failure: phase 0 °; amplitude 0.5A; post-fault a-phase current: phase 0 °; an amplitude of 2A;
a-phase voltage before fault: phase 0 °; the amplitude is 10V; post-fault a-phase current: phase-80 °; the amplitude is 2V;
phase B current before failure: phase 120 °; amplitude 0.5A; post-fault B-phase current: phase 120 °; amplitude 0.5A;
b-phase voltage before fault: phase 110 °; the amplitude is 10V; post-fault B-phase current: phase 110 °; the amplitude is 10V;
pre-fault C-phase current: phase-120 °; amplitude 0.5A; post-fault C-phase current: phase-120 °; amplitude 0.5A;
c-phase voltage before fault: phase-130 °; the amplitude is 10V; post-fault C-phase voltage: phase-130 °; the amplitude is 10V;
and correspondingly connecting the output end of the multi-channel linear amplifier into a three-phase high-precision current booster and a three-phase high-precision voltage booster respectively, setting the current transformation ratio of the current booster to be 1:10, setting the voltage transformation ratio of the voltage booster to be 1:1000, amplifying three-phase current and voltage waveforms before and after a fault, and finally forming waveforms before and after the fault as shown in fig. 2.
Phase a current before failure: phase 0 °; amplitude 5A; post-fault a-phase current: phase 0 °; an amplitude of 20A;
a-phase voltage before fault: phase 0 °; the amplitude is 10 kV; post-fault a-phase current: phase-80 °; the amplitude is 2 kV;
phase B current before failure: phase 120 °; amplitude 5A; post-fault B-phase current: phase 120 °; amplitude 5A;
b-phase voltage before fault: phase 110 °; the amplitude is 10 kV; post-fault B-phase current: phase 110 °; the amplitude is 10 kV;
pre-fault C-phase current: phase-120 °; amplitude 5A; post-fault C-phase current: phase-120 °; amplitude 5A;
c-phase voltage before fault: phase-130 °; the amplitude is 10 kV; post-fault C-phase voltage: phase-130 °; the amplitude is 10 kV;
A. b, C the formulas of the current and voltage waveforms of the three phases are as formula (1) and formula (2), the current unit A and the voltage unit V.
In the formulas (1) and (2), t represents time.
And respectively connecting the output ends of the three-phase high-precision current booster and the three-phase high-precision voltage booster into a primary side of a current transformer and a primary side of a voltage transformer of a breaker on a secondary fusion column to finish the application of the simulation fault of the single-phase earth fault.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A simulation fault applying method for a single-phase earth fault of a primary and secondary fusion complete set of pole upper circuit breakers is characterized in that: comprises the following specific steps of the following steps,
s1, selecting a three-phase current channel and a three-phase voltage channel on a multi-channel waveform generator;
s2, setting three-phase current and voltage waveforms before a fault;
s3, setting three-phase current and voltage waveforms after the fault;
s4, correspondingly connecting the output end of the multi-channel waveform generator to a multi-channel linear amplifier, and amplifying three-phase current and voltage waveforms before and after a fault;
s5, correspondingly and respectively connecting the output end of the multi-channel linear amplifier into a three-phase high-precision current booster and a three-phase high-precision voltage booster, and amplifying three-phase current and voltage waveforms before and after a fault;
s6, respectively connecting the output ends of the three-phase high-precision current booster and the three-phase high-precision voltage booster to a primary side of a current transformer and a primary side of a voltage transformer of a circuit breaker on a secondary fusion set column to complete the application of the simulation fault of the single-phase earth fault;
the current lags behind the voltage by 10 deg. in said step S2,
setting parameters in the A-phase current channel: phase 0 °; the amplitude is 50 mA;
setting parameters in an A phase voltage channel: phase-10 °; the amplitude is 100 mV;
setting parameters in a B-phase current channel: phase 120 °; the amplitude is 50 mA;
setting parameters in a B phase voltage channel: phase 110 °; the amplitude is 100 mV;
setting parameters in a C-phase current channel: phase-120 °; the amplitude is 50 mA;
setting parameters in a C-phase voltage channel: phase-130 °; the amplitude is 100 mV;
setting a sampling device with the frequency of 50Hz, the time starting point of 0ms, the time ending point of 40ms and the sampling point number of 2000 in all channels to collect current waveforms and voltage waveforms;
the failed phase current lags by a voltage of 80 deg. in said step S3,
setting parameters in the A-phase current channel: phase 0 °; the amplitude is 200 mA;
setting parameters in an A phase voltage channel: phase-80 °; the amplitude is 20 mV;
setting parameters in a B-phase current channel: phase 120 °; the amplitude is 50 mA;
setting parameters in a B phase voltage channel: phase 110 °; the amplitude is 100 mV;
setting parameters in a C-phase current channel: phase-120 °; the amplitude is 50 mA;
setting parameters in a C-phase voltage channel: phase-130 °; the amplitude is 100 mV; and (3) fault phase current and voltage step mutation, wherein a sampling device with the frequency of 50Hz, the time starting point of 40ms, the time ending point of 140ms and the number of sampling points of 2000 is arranged in all channels to collect current waveforms and voltage waveforms.
2. The method for applying the simulated fault of the single-phase earth fault of the primary-secondary fusion column-set circuit breaker according to claim 1, wherein the method comprises the following steps: in the step S4, a current amplification channel amplification ratio of 1:10 is set, and a voltage amplification channel amplification ratio of 1:100 is set.
3. The method for applying the simulated fault of the single-phase earth fault of the primary-secondary fusion column-set circuit breaker according to claim 1, wherein the method comprises the following steps: in step S5, the current transformation ratio of the three-phase high-precision booster is set to 1:10, and the voltage transformation ratio of the three-phase high-precision booster is set to 1: 1000.
4. The utility model provides a system is applyed to simulation fault that circuit breaker single-phase earth fault on secondary fusion set post which characterized in that: the system is used for executing the analog fault applying method of any one of claims 1 to 3, and comprises a multi-channel waveform generator (1), a multi-channel linear amplifier (2), a three-phase high-precision current booster (3), a three-phase high-precision voltage booster (4) and a secondary fusion on-column circuit breaker (5),
the output end of the multi-channel waveform generator (1) is connected to the multi-channel linear amplifier (2) and is used for generating A, B, C three-phase current waveforms and A, B, C three-phase voltage waveforms and transmitting A, B, C three-phase current waveforms and A, B, C three-phase voltage waveforms to the multi-channel linear amplifier (2);
the input end of the multi-channel linear amplifier (2) is connected with the multi-channel waveform generator (1), the output end of the multi-channel linear amplifier is connected with the three-phase high-precision booster (3) and the three-phase high-precision booster (4), the multi-channel linear amplifier (2) amplifies A, B, C three-phase current waveforms and A, B, C three-phase voltage waveforms, the amplified A, B, C three-phase current waveforms are transmitted to the three-phase high-precision booster (3), and the amplified A, B, C three-phase voltage waveforms are transmitted to the three-phase high-precision booster (4);
the input end of the three-phase high-precision current booster (3) is connected to the output end of the multi-channel linear amplifier (2), the output end of the three-phase high-precision current booster (3) is connected to the primary side of a current transformer of the secondary fusion set column upper circuit breaker (5), and the three-phase high-precision current booster (3) is used for boosting the current amplified by the multi-channel linear amplifier (2) and then transmitting the current to the primary side of the current transformer of the secondary fusion set column upper circuit breaker (5);
the input end of the three-phase high-precision booster (4) is connected to the output end of the multi-channel linear amplifier (2), the output end of the three-phase high-precision booster (4) is connected to the primary side of a voltage transformer of a secondary fusion on-column circuit breaker (5), and the three-phase high-precision booster (4) is used for boosting the current amplified by the multi-channel linear amplifier (2) and then transmitting the current to the primary side of the voltage transformer of the secondary fusion on-column circuit breaker (5);
each linear amplification channel of the multi-channel linear amplifier (2) is internally provided with a sampling device with the frequency of 50Hz, the time starting point of 0ms, the time ending point of 40ms and the number of sampling points of 2000;
a sampling device with the frequency of 50Hz, the time starting point of 40ms, the time ending point of 140ms and the number of sampling points of 2000 is arranged in each linear amplification channel of the multi-channel linear amplifier (2).
5. The system of claim 4, wherein the system comprises: the amplification ratio of a current amplification channel in the multi-channel linear amplifier (2) is 1:10, and the amplification ratio of a voltage amplification channel in the multi-channel linear amplifier is 1: 100.
6. The system of claim 4, wherein the system comprises: the current transformation ratio of the three-phase high-precision booster (3) is set to be 1:10, and the voltage transformation ratio of the three-phase high-precision booster (4) is set to be 1: 1000.
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| CN110514997B (en) * | 2019-09-10 | 2021-06-11 | 浙江华电器材检测研究所有限公司 | Detection device for detecting circuit breaker |
| CN110794300A (en) * | 2019-11-19 | 2020-02-14 | 国网湖北省电力有限公司电力科学研究院 | Three-phase full-voltage test power supply of breaker on primary and secondary fusion complete set of column |
| CN112379257A (en) * | 2020-11-13 | 2021-02-19 | 贵州电网有限责任公司 | High-precision fault inversion method without static error automatic feedback |
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