CN112924862A - Primary side fault injection FA detection system and method - Google Patents
Primary side fault injection FA detection system and method Download PDFInfo
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Abstract
The invention discloses a primary side fault injection FA detection system and a method, wherein the method comprises the following steps: a primary side fault injection FA detection system comprises a detection platform body and a primary-secondary fusion intelligent switch, wherein the detection platform body is connected to a primary side of the primary-secondary fusion intelligent switch through a high-voltage cable, the detection platform body is provided with a voltage-current power source and a boosting current booster which are sequentially connected, the detection platform body is further provided with a fault inversion test system, the detection platform body is connected to a power distribution network operation simulation system, and the power distribution network operation simulation system is provided with a power distribution model to be detected. On the basis of the traditional relay protection test, the supporting capability of a single device to the FA is verified based on a high-precision fault inversion test system, the feeder automatic detection can be realized, and the supporting capability of the single device to the FA is verified.
Description
Technical Field
The invention relates to a primary side fault injection FA detection system and method, and belongs to the technical field of primary and secondary fusion complete switch equipment detection.
Background
In the existing one-time and two-time fusion complete switch equipment detection, primary side fault injection FA detection cannot be realized, and an integrated detection platform body is a key link in a primary side fault injection FA detection system. Because the existing integrated detection table body occupies a large area and is expensive in equipment, each node is implemented by using the actual detection table body in actual detection, and the investment is too large.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a primary side fault injection FA detection system and method are provided to solve the technical problems in the prior art.
The technical scheme adopted by the invention is as follows: a primary side fault injection FA detection system comprises a detection platform body and a primary-secondary fusion intelligent switch, wherein the detection platform body is connected to a primary side of the primary-secondary fusion intelligent switch through a high-voltage cable, the detection platform body is provided with a voltage-current power source and a boosting current booster which are sequentially connected, the detection platform body is further provided with a fault inversion test system, the detection platform body is connected to a power distribution network operation simulation system, and the power distribution network operation simulation system is provided with a power distribution model to be detected.
The method comprises the following steps: after the primary side fault is injected, the detection stage body is used for collecting the action and state information of the integrated fusion intelligent switch, and further the FA action logic and the time sequence of the tested system are obtained.
Each detection platform body is in real-time communication with the power distribution network operation simulation system, receives electrical data transmitted by the power distribution network operation simulation system, converts the electrical data into electrical quantity, injects the electrical quantity into the integrated fusion intelligent switch, collects action and state information of the integrated fusion intelligent switch at the same time, and transmits the action and state information back to the power distribution network operation simulation system, and the simulation system recalculates operation data of the whole power distribution network according to action instructions and switch states.
And generating a detection record by the power distribution network operation simulation system.
The primary side fault injection is: the fault current and voltage signals of the voltage and current power source simulation are changed into high-voltage, large-current and high-precision electric signals after passing through the boosting current booster, and the electric signals are injected into the inlet and outlet wires of the switch body through the high-voltage cable, and the switch state is an actual state value.
The detection platform body adopts a ground-based FA secondary operation simulation model, and the ground-based FA secondary operation simulation model comprises a line outlet protection device, a sectional switch controller and a communication switch controller, wherein the line outlet protection device is used for protecting, measuring and controlling the interval units of each voltage class, has perfect protection, measurement, control, standby power supply automatic switching and communication monitoring functions, and provides a complete solution for the protection and control of a transformer substation, a power plant, high-low voltage power distribution and a power plant system; the sectional switch controller is used for matching with a front-stage switch on the power supply side, automatically opening a brake under the condition of no voltage or no current, and when a permanent fault occurs, the sectional switch controller is locked in a brake opening state after the opening and closing operations for a preset number of times, if the sectional switch controller does not complete the opening and closing operations for the preset number of times and the fault is cut off by other equipment, the sectional switch controller keeps the switch opening state and restores to a preset setting state after a period of time delay, so that preparation is made for the next fault, and the sectional switch controller cannot cut off the short-circuit fault current; the interconnection switch controller is used for a switch with an interconnection function, one power supply fails when the dual power supplies, and the load of the failed power supply is transferred to the other power supply through the interconnection switch.
FA action logic and time sequence of the tested system: delay switching-on logic:
(1) when the side A and the side B are powered off at the same time, after time t (t is more than Z time limit), any side participates in power supply, and the system performs X time limit timing;
(2) during the time limit timing of X, the power supply side is recovered in A, B and is not powered off, and after the timing is finished, the switch is switched on;
(3) in the time limit timing period of X, when the power supply side is recovered to power off again in A, B, the time limit of X is cleared, the time limit of X is restarted after the power supply is recovered again, and the switch is switched on after the time limit is finished.
A voltage and current power source is adopted for applying high-fidelity voltage and current signals on the primary side, the voltage and current power source is connected with a boosting current booster, the boosting current booster is connected to a switch to be tested through a high-voltage cable, the high-voltage cable connected with the switch to be tested performs extraction injection on current and voltage through a voltage transformer and a current transformer, the extracted current and voltage are fed back to the voltage and current power source, and the voltage and current power source performs closed-loop real-time adjustment.
The invention has the beneficial effects that: compared with the prior art, the method provided by the invention is based on the traditional relay protection test and based on a high-precision fault inversion test system, the FA supporting capability of a single device is verified, the feeder automatic detection can be realized, and the FA supporting capability of the single device is verified.
Drawings
FIG. 1 is a schematic diagram of primary side signal injection;
FIG. 2 is a primary side injection FA detection composition and dataflow diagram thereof;
FIG. 3 is a diagram of a simulation model of in-place FA secondary operation of a distribution network;
FIG. 4 is a schematic diagram of the S function logic control;
FIG. 5 is a schematic diagram of a boost riser;
FIG. 6 is a block diagram of a two-way synchronous sampling measurement system;
fig. 7 is a schematic diagram of a system for standard table access detection.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
Example 1: a primary side fault injection FA detection system comprises a detection platform body and a primary-secondary fusion intelligent switch, wherein the detection platform body is connected to a primary side of the primary-secondary fusion intelligent switch through a high-voltage cable, the detection platform body is provided with a voltage-current power source and a boosting current booster which are sequentially connected, the detection platform body is further provided with a fault inversion test system, the detection platform body is connected to a power distribution network operation simulation system, and the power distribution network operation simulation system is provided with a power distribution model to be detected.
The primary side fault injection is based on a primary and secondary fusion equipment integrated detection platform, a detection platform body is connected with a primary side of a switch through a high-voltage cable, fault current and voltage signals simulated by a voltage and current power source are changed into high-voltage, large-current and high-precision electrical signals after passing through a boosting current booster, and the high-voltage, large-current and high-precision electrical signals are injected into an inlet and outlet wire of a switch body through the high-voltage cable. The switch state is an actual state value, and simulation is not needed. The scheme can verify the supporting capability of a single device to the FA based on a high-precision fault inversion testing system on the basis of the traditional relay protection test.
Example 2: a primary side fault injection FA detection method comprises the following steps: after the primary side fault is injected, the detection stage body is used for collecting the action and state information of the integrated fusion intelligent switch, and further the FA action logic and the time sequence of the tested system are obtained.
Each detection platform body is in real-time communication with the power distribution network operation simulation system, receives electrical data transmitted by the power distribution network operation simulation system, converts the electrical data into electrical quantity, injects the electrical quantity into the integrated fusion intelligent switch, collects action and state information of the integrated fusion intelligent switch at the same time, and transmits the action and state information back to the power distribution network operation simulation system, and the simulation system recalculates operation data of the whole power distribution network according to action instructions and switch states.
And generating a detection record by the power distribution network operation simulation system.
The primary side fault injection is: the fault current and voltage signals of the voltage and current power source simulation are changed into high-voltage, large-current and high-precision electric signals after passing through the boosting current booster, and the electric signals are injected into the inlet and outlet wires of the switch body through the high-voltage cable, and the switch state is an actual state value.
The primary side fault injection FA detection system has the key link of the integrated detection platform body. Because the existing integrated detection table body occupies a large area and is expensive in equipment, each node is implemented by using the actual detection table body in actual detection, and the investment is too large. In order to realize the in-place FA system level detection of the integrated fusion switch and reduce the cost of an actual detection system, the invention provides an FA detection method based on primary side fault injection of HIL, wherein part of nodes adopt an in-place FA secondary operation simulation model to replace a real integrated switch for detection, and a detection platform body adopts an in-place FA secondary operation simulation model.
Generally, before the in-place FA function test is performed, a power distribution network operation simulation system needs to be used for modeling a tested network, and the tested system needs to be consistent with each node of the modeling network, namely a hardware test environment consistent with the tested network, including a tester and a tested terminal, needs to be established. If only a few nodes of the network under test need to be tested, it is obviously unreasonable to configure the tester and the terminal at the nodes that do not need to be tested. In order to solve the problems, the function of the power distribution network operation simulation system is expanded, a local FA simulation function is added, and the simulation function is configured on a node which does not need to be accessed to the test in the test network, so that the test of the whole tested network can be smoothly carried out.
The local FA system of the power distribution terminals at different positions in the power distribution network needs to bear different control logics, so that the test system needs to switch multiple roles (an outlet circuit breaker, a tie switch and a section switch), and the control logics are different according to different roles.
On the basis of analyzing the respective functional characteristics of the line outlet protection, the sectional switch controller, the interconnection switch controller and the like, a control logic model is established, a computer simulation method is designed, and the control logics are realized through software.
The in-place FA secondary operation simulation model comprises a line outlet protection device, a sectionalizing switch controller and a communication switch controller, wherein the line outlet protection device is used for protection measurement and control of interval units of each voltage class, has perfect protection, measurement, control, automatic switching of a standby power supply and communication monitoring functions, provides a complete solution for protection and control of a transformer substation, a power plant, high-low voltage power distribution and a plant power system, and can powerfully guarantee safe and stable operation of a high-low voltage power grid and the plant power system. The automatic system can be formed together with other protection and automation equipment through a communication interface. All the devices can be installed in a screen-assembling centralized manner or on site in a high-low voltage switch cabinet; the sectionalizing switch controller (Sectionalizer) is used for cooperating with a front-stage switch at the power supply side, automatically separating the brake under the condition of no voltage or no current, and when a permanent fault occurs, the sectionalizing switch controller is locked in a brake separating state after the opening and closing operations of a preset number of times, so that the purpose of isolating a fault circuit section is achieved, if the sectionalizing switch controller does not finish the opening and closing operations of the preset number of times and the fault is cut off by other equipment, the sectionalizing switch controller keeps a closing state and is restored to a preset setting state after a period of time delay, preparation is made for the next fault, and the sectionalizing switch controller cannot disconnect the short-circuit fault current; the interconnection switch controller is used for the switch of liaison effect, and a power supply breaks down when being used for dual power supply, shifts the load of trouble power supply to another power supply through the interconnection switch, improves the power supply reliability.
The in-place type FA includes a voltage time type, a voltage current type, and an adaptive integration type.
FA action logic and timing of the voltage time type system under test: delay switching-on logic (the control principle of the functional logic is shown in figure 4):
(1) when the side A and the side B are powered off at the same time, after time t (t is more than Z time limit), any side participates in power supply, and the system performs X time limit timing;
(2) during the time limit timing of X, the power supply side is recovered in A, B and is not powered off, and after the timing is finished, the switch is switched on;
(3) in the time limit timing period of X, when the power supply side is recovered to power off again in A, B, the time limit of X is cleared, the time limit of X is restarted after the power supply is recovered again, and the switch is switched on after the time limit is finished.
After the logics are realized through software simulation, the logics are deployed on corresponding monitoring nodes during detection, and the logics can be matched with the primary and secondary fusion intelligent equipment to be detected to complete the FA function of the whole line.
A voltage and current power source is adopted for applying high-fidelity voltage and current signals on the primary side, the voltage and current power source is connected with a boosting current booster, the boosting current booster is connected to a switch to be tested through a high-voltage cable, the high-voltage cable connected with the switch to be tested performs extraction injection on current and voltage through a voltage transformer and a current transformer, the extracted current and voltage are fed back to the voltage and current power source, and the voltage and current power source performs closed-loop real-time adjustment.
Example 3: as shown in fig. 5-7, a high-precision fault inversion method without static error automatic feedback includes: setting a preset short circuit, grounding and misoperation prevention fault scene, applying high-fidelity voltage and current signals on a primary side through software and hardware control, verifying the fault study, judgment and processing functions and performance of an intelligent switch, and verifying the fault processing capability of single equipment, wherein on a hardware level, a fault inversion test system transmits load side impedance to a source side in an impedance transmission mode, controls current in a current feedback mode, drives a large-current MOS tube to generate nonlinear voltage through a fast-response static-error-free automatic feedback control circuit to drive a load loop to obtain a high-precision primary signal, and then obtains a high-precision measurement result by utilizing a 2-channel multi-channel high-precision synchronous sampling measurement mode; on the software level, for a steady-state signal, a primary output signal is acquired in real time, and a voltage and current power source carries out compensation correction according to the load difference of a switch to be detected; for transient signals, a voltage and current power source periodically carries out amplitude and phase calibration setting according to a current output range in a segmented manner so as to ensure reliable performances of amplitude, phase, response time and the like of a primary output signal.
The high-precision fault inversion method can realize accurate simulation of a large-range (current, voltage amplitude, phase and transient characteristics) in primary side fault injection, realize continuous adjustability of injection current and voltage, effectively solve the problem that the injection current and voltage of the existing detection equipment cannot be continuously adjusted, and periodically carry out amplitude and phase calibration setting on transient signals according to a current output range in a segmented manner so as to ensure reliable performances of amplitude, phase, response time and the like of the primary output signals.
Preferably, the high-fidelity voltage and current signal applied to the primary side is a voltage and current power source, the voltage and current power source is connected with a boost current booster, the boost current booster is connected to a switch to be tested through a high-voltage cable, the high-voltage cable connected to the switch to be tested recovers injected current and voltage through a voltage transformer and a current transformer, the recovered current and voltage are fed back to the voltage and current power source, the voltage and current power source performs closed-loop real-time adjustment, and the recovered voltage of the voltage transformer is accessed to a high-precision three-phase standard table and used as a reference for precision evaluation.
Voltage boosting principle (taking phase a as an example): a voltage signal Uan output by a power source is connected to a low-voltage side by adopting a 10/0.22kV boosting PT, the output voltage of the high-voltage side is 10/0.22 × Uan (kV), and when 220V is input to the low-voltage side, the output of the high-voltage side can reach 10 kV.
Preferably, the 2-channel multi-channel high-precision synchronous sampling measurement method includes: including the synchronous sampling measurement system of double-circuit, as shown in fig. 2, the synchronous sampling measurement system of double-circuit (multi-functional standard table) includes two 16 passageways, sampling board, connecting plate and mainboard (ARM), every 8 passageways (including 4U passageway and 4I passageway) are connected to a sampling board, sampling board is connected to the connecting plate, the connecting plate is connected to the mainboard, the connecting plate still is connected with liquid crystal conversion board and front panel and power strip, the power strip connects the power supply terminal, communication interface is connected to the mainboard, synchronous sampling measurement method does: voltage and current signals of circuits of 16 channels are converted into alternating current input signals with amplitude values of-5V to + 5V through a voltage transformer and a current transformer, then the alternating current input signals are filtered by a low-pass filter circuit, the filtered signals are synchronously sampled and held by a sample/hold circuit to be converted into discrete signals, the sample/hold circuit adopts a synchronous sampling and time-sharing conversion method, namely, a circuit formed by two 8-channel synchronous sampling and synchronous holding A/D converters is adopted, a low-zero-drift amplification circuit is adopted at the first stage of the circuit, a low-pass filter follower is adopted at the second stage of the circuit, the A/D converter is required to respectively perform A/D conversion on multiple channels at each sampling point, the phase difference of each channel point is calculated, and 2-channel A/D sampling is synchronized again by adopting a frequency measurement and tracking phase-locking method.
The invention adopts the design ideas of synchronous sampling and time-sharing conversion, can save cost, only adopts two 8-channel synchronous sampling and synchronous holding A/D converters, adopts a low-zero-drift amplifying circuit in the circuit at the first stage, improves the anti-interference capability of input signals, adopts a low-pass filter follower to improve output impedance at the second stage, reduces the influence of current in the circuit, and simultaneously reduces the angle difference caused by the phase of each channel influenced by resistance-capacitance.
The multifunctional standard meter is matched with three-phase power to design a multichannel accuracy testing system so as to simulate the actual working condition on site and improve the detection efficiency, the multifunctional standard meter adopts a double high-speed processor and a large-scale logic array structure, an ADI 400MHz DSP is combined with a CPLD to be responsible for sampling and calculation, and an ARM is responsible for display and communication.
Preferably, the voltage and current signals of the circuit with 16 channels adopt a multifunctional standard table capable of collecting 2 channels and 16 channels, each channel comprises 4U channels and 4I channels, and the multifunctional standard table samples 2 channels and 16 channels of analog signals and calculates various voltages, currents and powers.
Preferably, the first path 8 of the analog large signal is a voltage range of 0-456V, the voltage is divided and sampled by a high-precision resistor, the output end of the analog large signal is connected with an amplifier OP2177 to increase output impedance, and the analog large signal is switched into an AD (analog to digital) signal and sampled at the same time; the current range is 0-20A, the current is converted into a small current signal (0-20 mA) through a current transformer, the small current signal is converted into a voltage signal through a sampling resistor, a gear is switched by adopting an analog switch, and finally the voltage signal is sent to AD (analog to digital) for sampling; the second path 8 of the channel is a small analog signal, the voltage range is 0-10V, differential input is adopted, the anti-interference capability of the signal is improved, the output impedance is improved by using an amplifier OP2177, the signal is sent to an instrument amplifier with gain to be processed, a high-frequency clutter signal in the environment is filtered out, and finally the signal is sent to AD for simultaneous sampling; 2, adopting a high-precision low-temperature drift device for the 16-path simulation channel to ensure that the variation of the adopted signal along with time and temperature is less than 10 ppm; the influence of the environment on the signals is eliminated by adding the band-pass filter, and the adoption precision of the instrument is guaranteed to reach five ten-thousandths.
Preferably, the signals processed by the first path of 8 channels and the second path of 8 channels are sent to an AD sampler, the AD sampler adopts a CPLD and a DSP to cooperatively control 2 blocks of AD, so as to realize sampling synchronization, and the error of the synchronous phase is less than 0.1 us.
Preferably, the AD sampler processes signals and then sends the sampling data to a CPLD cache through a high-speed serial bus to achieve a buffer storage amount, the DSP reads the sampling data at one time, the occupancy rate of the DSP is reduced, the 16-channel sampling data collected by the DSP calculates voltage, current, power and harmonic waves at the same time, ensures that the data of each cycle participate in calculation, and realizes seamless sampling and calculation functions. The data accuracy of the instrument is improved, and the real-time performance is also improved.
Preferably, the data calculated by the DSP is sent to the ARM through a parallel bus, and the ARM collects the calculated data and realizes the functions of digital display, graphic display, statistics and analysis according to the requirements of customers.
Preferably, the multifunctional standard meter is provided with a network port communication interface and a serial port communication interface, so that the multifunctional standard meter can conveniently communicate with various instruments and meters. The network port communication interface adopts RJ45 interface, 10/100M self-adaptation, and the serial port communication interface adopts RS232/RS485, and its configuration parameter reading is compared through the stipulation, looks over whether parameter setting is correct.
The manner in which the multi-purpose watch accesses the test system is shown in figure 3. Extracting current and voltage signals of the high-voltage side injection switch as reference signals; and current and voltage signals at PT and CT sides are acquired simultaneously, and high-precision testing of specific difference and angular difference is performed on the signals and reference signals. The method reduces the precision requirement of the primary signal power source, can obtain a high-precision test result as long as the source output is kept stable, and can realize automatic test.
Preferably, the boost current booster comprises a booster and a current booster; the low-voltage side of the booster is connected with a voltage signal output by a power source, one end of the high-voltage side is connected with an input port of the switch to be tested, and the other end of the high-voltage side is connected with the ground, so that the switch to be tested can acquire primary voltage. The requirement of simulating a high-voltage line is met; the output end of the current booster is connected to the switch to be tested by using high-voltage isolated current transformation equipment.
Preferably, the primary side of the transformer of the current transformation device is wound with N turns, the secondary side of the transformer is penetrated by the copper rod, and the voltage of the front and rear stages of the transformer is proportional to the number of turns.
Current transformation principle of the current booster: since the primary side voltage and the current are collinear, a high-voltage isolation type current conversion device must be used. IN the current transformation, the principle of energy conservation of the primary side and the secondary side of the transformer is utilized, the primary side (IA, IN) is wound by 6 turns, the secondary side is penetrated by a copper rod (equivalent to a coil with 1 turn), the voltage of the front stage and the rear stage of the transformer is IN proportion to the number of turns, the primary voltage is assumed to be 6U, the primary current is I initial, the secondary voltage is U, the secondary current is I, 6U I initial = U I initial, namely I initial = 6I initial, and the current transformation is increased by 6 times (IN an ideal case). In fact, due to the existence of leakage inductance of the transformer, the efficiency of energy transmission of the transformer cannot reach 100%, the primary current and the secondary current cannot be transmitted according to the set parameters, then the high-precision sampling CT is added to the copper rod, the current of the copper rod is monitored in real time and fed back to a power source, and the output precision of large current is guaranteed through real-time adjustment of a closed loop. Meanwhile, the output current of the high-precision sampling CT is connected into a high-precision three-phase standard table to be used as a reference for precision evaluation.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and therefore, the scope of the present invention should be determined by the scope of the claims.
Claims (8)
1. A primary side fault injection FA detection system, comprising: including detecting stage body and a secondary fusion intelligence switch, detect the stage body and pass through high tension cable connection to the primary side that a secondary fuses intelligence switch, detect the stage body and be provided with the voltage current power source and the current booster that step up that connect gradually, detect the stage body and still be provided with fault inversion test system, detect the stage body and be connected to distribution network operation simulation system, distribution network operation simulation system is provided with the distribution model that awaits measuring.
2. The primary-side fault injection (FA) detection method according to claim 1, wherein: the method comprises the following steps: after the primary side fault is injected, the detection stage body is used for collecting the action and state information of the integrated fusion intelligent switch, and further the FA action logic and the time sequence of the tested system are obtained.
3. The primary-side fault injection (FA) detection method according to claim 2, wherein: each detection platform body is in real-time communication with the power distribution network operation simulation system, receives electrical data transmitted by the power distribution network operation simulation system, converts the electrical data into electrical quantity, injects the electrical quantity into the integrated fusion intelligent switch, collects action and state information of the integrated fusion intelligent switch at the same time, and transmits the action and state information back to the power distribution network operation simulation system, and the simulation system recalculates operation data of the whole power distribution network according to action instructions and switch states.
4. The primary-side fault injection (FA) detection method according to claim 3, wherein: and generating a detection record by the power distribution network operation simulation system.
5. The primary-side fault injection (FA) detection method according to claim 2, wherein: the primary side fault injection is: the fault current and voltage signals of the voltage and current power source simulation are changed into high-voltage, large-current and high-precision electric signals after passing through the boosting current booster, and the electric signals are injected into the inlet and outlet wires of the switch body through the high-voltage cable, and the switch state is an actual state value.
6. The primary-side fault injection (FA) detection method according to claim 2, wherein: the detection platform body adopts a ground type FA secondary operation simulation model, and the ground type FA secondary operation simulation model comprises a line outlet protection device, a section switch controller and a connection switch controller, wherein the line outlet protection device is used for protection measurement and control of interval units of each voltage grade; the sectional switch controller is used for matching with a front-stage switch on the power supply side, automatically opening a brake under the condition of no voltage or no current, and when a permanent fault occurs, the sectional switch controller is locked in a brake opening state after the opening and closing operations for a preset number of times, if the sectional switch controller does not complete the opening and closing operations for the preset number of times and the fault is cut off by other equipment, the sectional switch controller keeps the switch opening state and restores to a preset setting state after a period of time delay, so that preparation is made for the next fault, and the sectional switch controller cannot cut off the short-circuit fault current; the interconnection switch controller is used for a switch with an interconnection function, one power supply fails when the dual power supplies, and the load of the failed power supply is transferred to the other power supply through the interconnection switch.
7. The primary-side fault injection (FA) detection method according to claim 2, wherein: FA action logic and time sequence of the tested system: delay switching-on logic:
(1) when the side A and the side B are powered off at the same time, after time t (t is more than Z time limit), any side participates in power supply, and the system performs X time limit timing;
(2) during the time limit timing of X, the power supply side is recovered in A, B and is not powered off, and after the timing is finished, the switch is switched on;
(3) in the time limit timing period of X, when the power supply side is recovered to power off again in A, B, the time limit of X is cleared, the time limit of X is restarted after the power supply is recovered again, and the switch is switched on after the time limit is finished.
8. The primary-side fault injection (FA) detection method according to claim 2, wherein: a voltage and current power source is adopted for applying high-fidelity voltage and current signals on the primary side, the voltage and current power source is connected with a boosting current booster, the boosting current booster is connected to a switch to be tested through a high-voltage cable, the high-voltage cable connected with the switch to be tested performs extraction injection on current and voltage through a voltage transformer and a current transformer, the extracted current and voltage are fed back to the voltage and current power source, and the voltage and current power source performs closed-loop real-time adjustment.
Priority Applications (1)
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| CN113504467A (en) * | 2021-07-23 | 2021-10-15 | 国网江苏省电力有限公司宿迁供电分公司 | High-precision waveform inversion system |
| CN114019297A (en) * | 2021-09-26 | 2022-02-08 | 中国电力科学研究院有限公司 | Distribution line high-frequency transient characteristic signal generating device and control method thereof |
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| CN114019297A (en) * | 2021-09-26 | 2022-02-08 | 中国电力科学研究院有限公司 | Distribution line high-frequency transient characteristic signal generating device and control method thereof |
| CN114019297B (en) * | 2021-09-26 | 2023-11-03 | 中国电力科学研究院有限公司 | High-frequency transient characteristic signal generating device of distribution line and control method thereof |
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