CN112924862B - System and method for detecting primary side fault injection (FA) - Google Patents
System and method for detecting primary side fault injection (FA) Download PDFInfo
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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
Abstract
The invention discloses a system and a method for detecting primary side fault injection (FA), wherein the method comprises the following steps: the primary side fault injection FA detection system comprises a detection platform body and a secondary fusion intelligent switch, wherein the detection platform body is connected to the primary side of the 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 tested. On the basis of the traditional relay protection test, the invention verifies the supporting capability of the single equipment to the FA based on the high-precision fault inversion test system, can realize feeder line automatic detection and verifies the supporting capability of the single equipment to the FA.
Description
Technical Field
The invention relates to a primary side fault injection FA detection system and method, and belongs to the technical field of detection of secondary fusion complete switch equipment.
Background
In the current detection of the primary-side fault injection FA, the primary-side fault injection FA detection system cannot be realized, and the integrated detection platform body is a key link. Because the existing integrated detection platform body has large occupied area and expensive equipment, the investment of implementing each node by using the actual detection platform body in actual detection is too large.
Disclosure of Invention
The invention aims to solve the technical problems that: a primary side fault injection FA detection system and method are provided to solve the technical problems existing in the prior art.
The technical scheme adopted by the invention is as follows: the primary side fault injection FA detection system comprises a detection platform body and a secondary fusion intelligent switch, wherein the detection platform body is connected to the primary side of the 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 tested.
The method comprises the following steps: after primary side fault injection, the action and state information of the integrated intelligent switch are collected through the detection platform body, so that FA action logic and time sequence of the tested system are obtained.
Each detection platform body is communicated with the power distribution network operation simulation system in real time, receives electric data transmitted by the power distribution network operation simulation system, converts the electric data into electric quantity, injects the electric quantity into the integrated intelligent switch, collects action and state information of the integrated intelligent switch, transmits the action and state information back to the power distribution network operation simulation system, and recalculates the operation data of the whole power distribution network according to action instructions and switch states.
And the power distribution network operation simulation system generates a detection record.
The primary side fault injection is as follows: the fault current and voltage signals simulated by the voltage current power source are changed into high-voltage, high-current and high-precision electrical signals after passing through the boost current booster, and are injected into the switch body incoming and outgoing line through the high-voltage cable, and the switch state is an actual state value.
The detection platform body adopts an in-situ FA secondary operation simulation model, and the in-situ FA secondary operation simulation model comprises a line outlet protection device, a sectionalizing switch controller and a contact switch controller, wherein the line outlet protection device is used for protecting, measuring and controlling interval units of all voltage levels, has perfect protection, measurement, control and automatic switching and communication monitoring functions of a standby power supply, and provides a complete solution for protecting and controlling a transformer substation, a power plant, high-low voltage power distribution and a power plant system; the sectional switch controller is used for being matched with a power supply side front-stage switch, automatically switching off under the condition of voltage loss or no current, when a permanent fault occurs, the sectional switch controller is locked in a switching-off state after switching-on and switching-off operations for a preset number of times, if the sectional switch controller does not complete switching-on and switching-off operations for a preset number of times, the fault is cut off by other equipment, the sectional switch controller keeps a switching-on state, and is restored 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 break short-circuit fault current; the tie switch controller is used for a switch with a tie function, and is used for transferring the load of a fault power supply to another power supply through the tie switch when one power supply fails during double-power supply.
FA action logic and timing for the tested system: delay closing logic:
(1) When the power is cut off at the same time at the side B of the side A, after the time t (t is greater than the time limit Z), any side participates in power supply, and the system carries out time limit X;
(2) During the time limit of X, the power supply side in A, B is not powered off any more, and after the time limit is finished, the switch is switched on;
(3) And during the X time limit timing period, the power supply side is powered off again in A, B, the X time limit is cleared, the X time is restarted after the power supply is restored again, and the switch is switched on after the timing is completed.
The primary side is applied with high-fidelity voltage and current signals, a voltage current power source is adopted, the voltage 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 carries out stoping injection current and voltage through a voltage transformer and a current transformer, the stoping voltage and current are fed back to the voltage current power source, and the voltage current power source carries out closed-loop real-time adjustment.
The invention has the beneficial effects that: compared with the prior art, the invention verifies the supporting capability of a single device to the FA based on the high-precision fault inversion test system on the basis of the traditional relay protection test, can realize feeder automation detection, and verifies the supporting capability of the single device to the FA.
Drawings
FIG. 1 is a schematic diagram of primary side signal injection;
FIG. 2 is a diagram of a primary side injection FA detection component and a data flow diagram thereof;
FIG. 3 is a simulation model diagram of in-situ FA operation of a power distribution network;
FIG. 4 is a schematic diagram of the S-function logic control;
FIG. 5 is a schematic diagram of a boost up-converter;
FIG. 6 is a block diagram of a two-way synchronous sampling measurement system;
Fig. 7 is a schematic diagram of a standard table access detection system.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific examples.
Example 1: the primary side fault injection FA detection system comprises a detection platform body and a secondary fusion intelligent switch, wherein the detection platform body is connected to the primary side of the 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 tested.
The primary side fault injection is based on a secondary fusion device integrated detection platform, the detection platform body is connected with the primary side of the switch by a high-voltage cable, fault current and voltage signals simulated by a voltage current power source are changed into high-voltage, high-current and high-precision electrical signals after passing through a boosting current booster, and the high-voltage, high-current and high-precision electrical signals are injected into a switch body inlet and outlet wire 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 test system on the basis of the traditional relay protection test.
Example 2: the method for detecting the primary side fault injection FA comprises the following steps: after primary side fault injection, the action and state information of the integrated intelligent switch are collected through the detection platform body, so that FA action logic and time sequence of the tested system are obtained.
Each detection platform body is communicated with the power distribution network operation simulation system in real time, receives electric data transmitted by the power distribution network operation simulation system, converts the electric data into electric quantity, injects the electric quantity into the integrated intelligent switch, collects action and state information of the integrated intelligent switch, transmits the action and state information back to the power distribution network operation simulation system, and recalculates the operation data of the whole power distribution network according to action instructions and switch states.
And the power distribution network operation simulation system generates a detection record.
The primary side fault injection is as follows: the fault current and voltage signals simulated by the voltage current power source are changed into high-voltage, high-current and high-precision electrical signals after passing through the boost current booster, and are injected into the switch body incoming and outgoing line through the high-voltage cable, and the switch state is an actual state value.
The primary side fault injection FA detection system and the integrated detection platform are key links. Because the existing integrated detection platform body has large occupied area and expensive equipment, the investment of implementing each node by using the actual detection platform body in actual detection is too large. In order to realize the in-situ 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 for primary side fault injection based on HIL, partial nodes adopt an in-situ FA secondary operation simulation model to replace the actual integrated switch for detection, and a detection platform body adopts an in-situ FA secondary operation simulation model.
Generally, before performing in-situ FA functional test, a network to be tested needs to be modeled by using a power distribution network operation simulation system, and the system to be tested needs to be consistent with each node of the modeled network, i.e. a hardware test environment consistent with the network to be tested needs to be built, including a tester and a terminal to be tested. If only a few nodes of the network to be tested need to be tested, it is obviously not reasonable to configure the tester and the terminal at the nodes which do not need to be tested. In order to solve the problems, the function expansion is performed on the power distribution network operation simulation system, the in-situ FA simulation function is added, and the simulation function is configured without accessing the tested nodes in the test network, so that the test of the whole network to be tested can be smoothly performed.
The in-situ FA system needs to assume different control logic for the distribution terminals at different locations in the distribution network, so that the test system needs to switch multiple roles (egress circuit breaker, tie switch, sectionalizer), and the control logic is different for different roles.
On the basis of analyzing the respective functional characteristics of the line outlet protection, the sectionalizing switch controller, the interconnecting switch controller and the like, a control logic model is established, a computer simulation method is designed, and the control logic is realized through software.
The in-situ FA secondary operation simulation model comprises a line outlet protection device, a sectionalizing switch controller and a contact switch controller, wherein the line outlet protection device is used for protecting and measuring and controlling interval units of various voltage levels, has perfect protection, measurement, control and stand-by power supply automatic switching and communication monitoring functions, provides a complete solution for protecting and controlling a transformer substation, a power plant, high-low voltage power distribution and a power plant system, and can effectively ensure safe and stable operation of the high-low voltage power network and the power plant system. The system can be combined with other protection and automation equipment through a communication interface to form an automation system. All devices can be assembled and installed in a centralized manner, and can also be installed on a high-low voltage switch cabinet in situ; the sectionalizer (Sectionalizer)) is used for being matched with a power supply side front-stage switch, automatically switching off under the condition of voltage loss or no current, and when a permanent fault occurs, the sectionalizer is locked in a switching-off state after switching-on and switching-off operations for a preset number of times, so that the purpose of isolating a fault line section is achieved, if the sectionalizer does not complete switching-on and switching-off operations for a preset number of times, the sectionalizer is cut off by other equipment, then the sectionalizer keeps a switching-on state, and returns to a preset setting state after a period of time delay, so that preparation is made for the next fault, and the sectionalizer cannot break short-circuit fault current; the interconnection switch controller is used for a switch with interconnection function, one power supply fails when the double power supplies are used for supplying power, and the interconnection switch is used for transferring the load of the failed power supply to the other power supply, so that the power supply reliability is improved.
The in-situ type FA includes a voltage time type, a voltage current type, and an adaptive integration type.
FA action logic and timing of voltage-time-type system under test: time-delay closing logic (the functional logic control principle is shown in fig. 4):
(1) When the power is cut off at the same time at the side B of the side A, after the time t (t is greater than the time limit Z), any side participates in power supply, and the system carries out time limit X;
(2) During the time limit of X, the power supply side in A, B is not powered off any more, and after the time limit is finished, the switch is switched on;
(3) And during the X time limit timing period, the power supply side is powered off again in A, B, the X time limit is cleared, the X time is restarted after the power supply is restored again, and the switch is switched on after the timing is completed.
After the logics are realized through software simulation, the logics are deployed on corresponding monitoring nodes during detection, and the FA function of the whole circuit can be completed by matching with the tested secondary fusion intelligent equipment.
The primary side is applied with high-fidelity voltage and current signals, a voltage current power source is adopted, the voltage 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 carries out stoping injection current and voltage through a voltage transformer and a current transformer, the stoping voltage and current are fed back to the voltage current power source, and the voltage current power source carries out closed-loop real-time adjustment.
Example 3: as shown in fig. 5-7, a high-precision fault inversion method without static difference automatic feedback comprises the following steps: setting fault scenes of preset short circuit, grounding and misoperation prevention, applying high-fidelity voltage and current signals on a primary side through software and hardware control, verifying fault diagnosis, processing functions and performance of an intelligent switch, verifying fault processing capacity of a single device, transmitting load side impedance to a source side through an impedance transmission mode by a fault inversion test system on a hardware level, controlling current in a current feedback mode, driving a high-current MOS tube to generate a nonlinear voltage driving load loop to obtain a high-precision primary signal through a quick-response non-static-difference automatic feedback control circuit, and obtaining a high-precision measurement result by a 2-channel multi-channel high-precision synchronous sampling measurement mode; at the software level, for steady-state signals, extracting primary output signals in real time, and compensating and correcting voltage current power sources according to the load difference of the switch to be detected; for transient signals, the voltage current power source periodically performs amplitude and phase calibration setting according to the current output range in a sectionalized manner so as to ensure reliable performances of amplitude, phase, response time and the like of primary output signals.
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 adjustment of injection current and voltage, effectively solve the problem that the current and voltage injected by the existing detection equipment cannot be continuously adjustable, and periodically calibrate and adjust amplitude and phase of a transient signal according to current output range sections so as to ensure reliable performances of amplitude, phase, response time and the like of the primary output signal.
Preferably, the primary side is applied with high-fidelity voltage and current signals by adopting a voltage-current power source, the voltage-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 carries out stoping injection current and voltage through a voltage transformer and a current transformer, the stoping voltage and the current are fed back to the voltage-current power source, the voltage-current power source carries out closed-loop real-time adjustment, and the stoping voltage of the voltage transformer is connected to a high-precision three-phase standard meter to serve as a reference for precision evaluation.
Principle of voltage boosting (for example, phase a): and 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 voltage of the high-voltage side can reach 10kV.
Preferably, the 2-path multichannel high-precision synchronous sampling measurement mode comprises the following steps: including the synchronous sampling measurement system of double-circuit, as shown in fig. 6, synchronous sampling measurement system of double-circuit (multi-functional standard table) includes two way 16 passageway, sampling board, connecting plate and mainboard (ARM), and every way 8 passageway (including 4U passageway and 4I passageway) is connected to a sampling board, and the sampling board is connected to the connecting plate, and the connecting plate is connected to the mainboard, and the connecting plate still is connected with liquid crystal conversion board and front panel and power strip, and power strip connects power supply terminal, and the communication interface is connected to the mainboard, synchronous sampling measurement method does: the voltage and current signals of the 16-channel circuits are changed into alternating current input signals with the amplitude of-5V to +5V through a voltage transformer and a current transformer, then the alternating current input signals are filtered through a low-pass filter circuit, the filtered signals are synchronously sampled and held through a sampling/holding circuit to be changed into discrete signals, the sampling/holding 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, a low-zero drift amplifying circuit is adopted at one stage of the circuit, a low-pass filter follower is adopted at the second stage of the circuit, A/D conversion is carried out on multiple channels respectively at each sampling point, the phase difference of each channel point is calculated, and 2-channel A/D sampling is synchronized again through a frequency measurement and tracking phase locking method.
By adopting the design ideas of synchronous sampling and time-sharing conversion, the cost can be saved, only two 8-channel synchronous sampling and synchronous holding A/D converters are adopted, a low-zero drift amplifying circuit is adopted as one stage in the circuit, the anti-interference capability of an input signal is improved, a low-pass filter follower is adopted as a second stage, the output impedance is improved, the influence of current in the circuit is reduced, and meanwhile, the angle difference caused by the phase of each channel influenced by resistance and capacitance is reduced.
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 of the site and improve the detection efficiency, adopts a double high-speed processor and large-scale logic array structure, and the ADI 400MHz DSP is combined with the CPLD to be responsible for sampling and calculating, and the ARM is responsible for displaying and communicating.
Preferably, the voltage and current signals of the 16-channel circuit adopt a multifunctional standard meter capable of collecting 2 channels of 16 channels, each channel comprises a 4U channel and a 4I channel, the multifunctional standard meter samples 2 channels of 16-channel analog signals, and calculates various voltages, currents and powers.
Preferably, the first path 8 channel is an analog large signal, the voltage range is 0-456V, sampling is performed through high-precision resistor voltage division, the output end is connected with an amplifier OP2177 to follow and improve the output impedance, an analog switch is adopted to switch a gear, and the analog switch is sent to AD for sampling 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, then the small current signal is converted into a voltage signal through a sampling resistor, a simulated switch is adopted to switch gear shifting, and finally the small current signal is sent into an AD for simultaneous sampling; the second path 8 is an analog small 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 the output of an amplifier OP2177, the signal is sent to an instrument amplifier with gain to process the signal, the high-frequency clutter signal in the environment is filtered out, and finally the signal is sent to AD for simultaneous sampling; the 2 paths of 16 analog channels adopt high-precision low-temperature drift devices, so that the change of the adopted signals along with time and temperature is ensured to be less than 10ppm; the band-pass filter is added to eliminate the influence of the environment on the signals, so that the adoption accuracy of the instrument is ensured to reach five parts per million.
Preferably, the signals processed by the first path 8 channel and the second path 8 channel are sent to an AD sampler, and the AD sampler adopts CPLD and DSP to control 2 AD blocks in a matching way, so that sampling synchronization is realized, and the synchronization phase error is smaller than 0.1us.
Preferably, the AD sampler processes signals and then sends sampling data to the CPLD buffer memory through the high-speed serial bus, so as to achieve the buffer capacity, the DSP reads out the sampling data once, the occupancy rate of the DSP is reduced, the 16-channel sampling data collected by the DSP is calculated, and meanwhile, the voltage, the current, the power and the harmonic wave are calculated, so that the data of each cycle are ensured to participate in calculation, and the seamless sampling and calculating functions are realized. 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, the ARM collects the calculated data, and the digital display, graphic display, statistics and analysis functions are realized according to the requirements of clients.
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 an RJ45 interface and is 10/100M self-adaptive, the serial port communication interface adopts RS232/RS485, and configuration parameters of the serial port communication interface can be read and compared through a protocol to check whether parameter setting is correct.
The manner in which the multifunction table is accessed into the test system is shown in fig. 7. Extracting current and voltage signals of the injection switch at the high-voltage side as reference signals; meanwhile, current and voltage signals at PT and CT sides are collected, and a high-precision test of comparison difference and angle difference is carried out with a reference signal. The method reduces the accuracy requirement of the primary signal power source, can obtain a high-accuracy test result as long as the source output is kept stable, and can realize automatic test.
Preferably, the booster-booster converter includes a booster and a booster converter; 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 a 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 circuit is met; the voltage and the current of the primary side of the switch to be tested are collinear at the output end of the current booster, and the output end of the current booster is connected to the switch to be tested by using high-voltage isolated current conversion equipment.
Preferably, the primary side of the transformer of the current conversion device is wound with N turns, the secondary side is penetrated by a copper rod, and the front and back stage voltages of the transformer are in direct proportion to the turns.
Current conversion principle of current booster: since the voltage is collinear with the current at the primary side, a high voltage isolated current transformation device must be used. IN the current transformation, the principle of conservation of energy of the primary side and the secondary side of the transformer is utilized, the primary side (IA, IN) is wound for 6 turns, the secondary side is penetrated by a copper rod (corresponding to 1 turn of coil), the voltage of the front stage and the back stage of the transformer is proportional to the number of turns, the primary voltage is assumed to be 6U, the primary current is I primary, the secondary voltage is U, the secondary current is I times, 6U times I primary=U times I times, namely I times=6I times primary, and the current transformation is improved by 6 times (ideal case). In practice, due to the existence of leakage inductance of the transformer, the energy transmission efficiency of the transformer cannot reach 100%, primary current and secondary current cannot be transmitted according to the set parameters, the high-precision sampling CT is added on the copper rod, the current of the copper rod is monitored in real time and fed back to the power source, and the output precision of large current is ensured through real-time adjustment of a closed loop. And meanwhile, the output current of the high-precision sampling CT is accessed into a high-precision three-phase standard table to serve as a reference for precision evaluation.
The foregoing is merely illustrative of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present invention, and therefore, the scope of the present invention shall be defined by the scope of the appended claims.
Claims (4)
1. The primary side fault injection FA detection method is characterized in that: the primary side fault injection FA detection system adopted by the detection method comprises a detection platform body and a secondary fusion intelligent switch, wherein the detection platform body is connected to the primary side of the secondary fusion intelligent switch through a high-voltage cable, the detection platform body is provided with a voltage and current power source and a boosting booster which are sequentially connected, the detection platform body is also 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 tested, and the method comprises the following steps: after primary side fault injection, collecting action and state information of the integrated fusion intelligent switch through a detection platform body, and further obtaining FA action logic and time sequence of a tested system; each detection platform body is communicated with the power distribution network operation simulation system in real time, receives electric data transmitted by the power distribution network operation simulation system, converts the electric data into electric quantity, injects the electric quantity into the integrated intelligent switch, collects action and state information of the integrated intelligent switch, transmits the action and state information back to the power distribution network operation simulation system, and recalculates the operation data of the whole power distribution network according to the action instruction and the switch state;
The detection platform body adopts an in-situ FA secondary operation simulation model, and the in-situ FA secondary operation simulation model comprises a line outlet protection device, a sectionalizing switch controller and a tie switch controller, wherein the line outlet protection device is used for protecting and measuring and controlling interval units of each voltage level; the sectional switch controller is used for being matched with a power supply side front-stage switch, automatically switching off under the condition of voltage loss or no current, when a permanent fault occurs, the sectional switch controller is locked in a switching-off state after switching-on and switching-off operations for a preset number of times, if the sectional switch controller does not complete switching-on and switching-off operations for a preset number of times, the fault is cut off by other equipment, the sectional switch controller keeps a switching-on state, and is restored 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 break short-circuit fault current; the interconnection switch controller is used for a switch with interconnection function, and is used for transferring the load of a fault power supply to another power supply through the interconnection switch when one power supply fails during double-power supply; FA action logic and timing for the tested system: delay closing logic:
(1) When the power is cut off at the same time at the side B of the side A, after the time t is passed, wherein t is larger than the time limit Z, any side participates in power supply, and the system carries out time limit X;
(2) During the time limit of X, the power supply side in A, B is not powered off any more, and after the time limit is finished, the switch is switched on;
(3) During the X time limit timing period, the power supply side in A, B is powered off again, the X time limit is cleared, the X time limit is restarted after the power supply is restored again, and the switch is switched on after the timing is completed;
The fault inversion method of the fault inversion test system comprises the following steps: setting a fault scene of preset short circuit, grounding and misoperation prevention, applying high-fidelity voltage and current signals on a primary side, verifying the fault judging and processing functions and performances of an intelligent switch, verifying the fault processing capacity of a single device, transmitting load side impedance to a source side by a fault inversion test system through an impedance transmission mode, controlling current to adopt a current feedback mode, driving a high-current MOS tube to generate a nonlinear voltage to drive a load loop to obtain a primary signal by a static-difference-free automatic feedback control circuit, and obtaining a high-precision measurement result by a 2-path multichannel high-precision synchronous sampling measurement mode; for steady-state signals, extracting primary output signals in real time, and compensating and correcting a voltage current power source according to the load difference of the switch to be detected; and for transient signals, the voltage current power source periodically performs amplitude and phase calibration setting according to the current output range.
2. The primary side fault injection FA detection method of claim 1, wherein: and the power distribution network operation simulation system generates a detection record.
3. The primary side fault injection FA detection method of claim 1, wherein: the primary side fault injection is as follows: the fault current and voltage signals simulated by the voltage current power source are changed into high-voltage, high-current and high-precision electrical signals after passing through the boost current booster, and are injected into the switch body incoming and outgoing line through the high-voltage cable, and the switch state is an actual state value.
4. The primary side fault injection FA detection method of claim 1, wherein: the primary side is applied with high-fidelity voltage and current signals, a voltage current power source is adopted, the voltage 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 carries out stoping injection current and voltage through a voltage transformer and a current transformer, the stoping voltage and current are fed back to the voltage current power source, and the voltage current power source carries out closed-loop real-time adjustment.
Priority Applications (1)
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