A distribution network on-site FA secondary operation simulation system and method

Abstract

The present invention discloses a distribution network on-site FA secondary operation simulation system and method, including a line outlet protection device, a section switch controller and a connecting switch controller, wherein the line outlet protection device is used for protection measurement and control of interval units of various voltage levels; the section switch controller is used to cooperate with the front-stage switch on the power supply side, automatically open the gate in the case of loss of voltage or no current, and when a permanent fault occurs, the section switch controller is locked in the open state after a predetermined number of opening and closing operations; the connecting switch controller is used as a switch that acts as a connection, and is used when one power supply fails during dual power supply, and the load of the failed power supply is transferred to another power supply through the connecting switch. The present invention realizes on-site FA system-level detection of an integrated fusion switch, and reduces the cost of the actual detection system, effectively solving the problem that only a few nodes of the tested network need to be tested, and the nodes that need to be tested need to be configured with testers and terminals, resulting in high costs.

Description

Technical Field

[0001] The invention relates to a distribution network on-site FA secondary operation simulation system and method, belonging to the technical field of primary and secondary integrated switchgear detection. Background Art

[0002] An on-site FA secondary operation simulation system for a distribution network, in which an integrated detection platform is a key link. Since the existing integrated detection platform occupies a large area and the equipment is expensive, it is too expensive to use the actual detection platform to implement each node in the actual detection. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a distribution network on-site FA secondary operation simulation system and method to solve the technical problems existing in the prior art.

[0004] The technical solution adopted by the present invention is: a distribution network on-site FA secondary operation simulation system, including a line outlet protection device, a section switch controller and a connecting switch controller, wherein the line outlet protection device is used for protection and measurement of interval units of various voltage levels; the section switch controller is used to cooperate with the front-stage switch on the power supply side, and automatically open the switch in the case of loss of voltage or no current. When a permanent fault occurs, the section switch controller is locked in the open state after a predetermined number of opening and closing operations; the connecting switch controller is used as a switch that acts as a connection. When one power supply fails during dual power supply, the load of the failed power supply is transferred to another power supply through the connecting switch.

[0005] The line outlet protection device has the functions of protection, measurement, control, automatic switching of backup power supply and communication monitoring, providing solutions for the protection and control of substations, power plants, high and low voltage power distribution and factory power systems.

[0006] A simulation method for an on-site FA secondary operation simulation system of a distribution network, the method comprising: using a distribution network operation simulation system to add an on-site FA secondary operation simulation system, using the distribution network operation simulation system to model a network under test before the on-site FA secondary operation simulation system performs an on-site FA function test, building a hardware test environment consistent with the network under test, including a tester and a terminal under test, and for distribution terminals at different positions in the distribution network, the on-site FA secondary operation simulation system assumes different control logics, switches multi-role outlet circuit breakers, tie switches and section switches, and has different control logics for different roles, and establishes a control logic model based on the analysis of the functional characteristics of the line outlet protection, section switch controller and tie switch controller.

[0007] On-site FA includes voltage-time type, voltage-current type, and adaptive comprehensive type.

[0008] If the section switch controller fails to complete the predetermined number of opening and closing operations and the fault is cleared by other equipment, it will remain in the closed state and return to the pre-set state after a delay, preparing for the next fault.

[0009] Sectional switch controller cannot disconnect short-circuit fault current.

[0010] FA action logic and timing of the voltage-time type system under test: Delay closing logic:

[0011] (1) When both side A and side B lose power at the same time, after time t (t>Z time limit), either side will participate in the power supply, and the system will start timing for X time limit;

[0012] (2) During the X time limit, the power supply side of A and B is restored and no longer cut off. After the timing is completed, the switch is closed;

[0013] (3) During the X time limit timing, if the power supply side of A or B is restored and power is cut off again, the X timer will be reset to zero. After the power supply is restored, the X timer will restart. After the timing is completed, the switch will be closed.

[0014] During detection, the control logic is deployed on the corresponding monitoring node to cooperate with the primary and secondary fusion intelligent device under test to complete the FA function of the entire line.

[0015] Beneficial effects of the present invention: Compared with the prior art, some nodes of the present invention adopt an on-site FA secondary operation simulation model to replace the real integrated switch for detection, thereby realizing on-site FA system-level detection of the integrated fusion switch, and reducing the cost of the actual detection system, and effectively solving the problem that only a few nodes of the network under test need to be tested. At this time, it is obviously unreasonable to configure testers and terminals at nodes that do not need to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of primary side signal injection;

[0017] Figure 2 The primary side injection FA detection composition and its data flow diagram;

[0018] Figure 3 This is the simulation model diagram of the secondary operation of the local FA of the distribution network;

[0019] Figure 4 This is the S function logic control schematic diagram;

[0020] Figure 5 This is the schematic diagram of the booster current raiser;

[0021] Figure 6 It is the block diagram of dual-channel synchronous sampling measurement system;

[0022] Figure 7 This is a schematic diagram of the standard table access detection system. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Embodiment 1: A distribution network on-site FA secondary operation simulation system includes a detection platform and a primary-secondary integrated intelligent switch. The detection platform is connected to the primary side of the primary-secondary integrated intelligent switch through a high-voltage cable. The detection platform is provided with a voltage and current power source and a booster connected in sequence. The detection platform is also provided with a fault inversion test system. The detection platform is connected to the distribution network operation simulation system, and the distribution network operation simulation system is provided with a distribution model to be tested.

[0025] Primary side fault injection refers to the integration of primary and secondary fusion equipment test bench as the basis. The test bench body is connected to the primary side of the switch with a high-voltage cable. The fault current and voltage signals simulated by the voltage and current power source are converted into high-voltage, high-current, and high-precision electrical signals after passing through the booster and current booster. They are injected into the switch body inlet and outlet lines through the high-voltage cable. The switch state is the actual state value and no simulation is required. This solution can verify the support capability of a single device for FA based on the high-precision fault inversion test system on the basis of traditional relay protection testing.

[0026] Embodiment 2: A simulation method for an on-site FA secondary operation simulation system of a distribution network, the method comprising: after a primary-side fault is injected, the action and status information of the integrated fusion intelligent switch is collected through a detection platform, thereby obtaining the FA action logic and timing of the system under test.

[0027] Each test station communicates with the distribution network operation simulation system in real time, receives the electrical data transmitted by the distribution network operation simulation system, converts the electrical data into electrical quantities and injects them into the integrated fusion intelligent switch. At the same time, it collects the action and status information of the integrated fusion intelligent switch and transmits it back to the distribution network operation simulation system. The simulation system recalculates the operation data of the entire distribution network based on the action instructions and switch status.

[0028] The distribution network operation simulation system generates detection records.

[0029] The primary side fault injection is as follows: the fault current and voltage signals simulated by the voltage and current power source are converted into high-voltage, high-current, and high-precision electrical signals after passing through the booster and current raiser, and are injected into the switch body input and output lines through the high-voltage cable. The switch state is the actual state value.

[0030] An on-site FA secondary operation simulation system for a distribution network, wherein an integrated detection platform is a key link. Since the existing integrated detection platform occupies a large area and the equipment is expensive, the investment is too large to implement each node with an actual detection platform in actual detection. In order to realize on-site FA system-level detection of an integrated fusion switch and reduce the cost of the actual detection system, the present invention proposes a FA detection method based on primary-side fault injection of HIL, in which some nodes use an on-site FA secondary operation simulation model instead of a real integrated switch for detection, and the detection platform uses an on-site FA secondary operation simulation model.

[0031] Usually, before conducting an on-site FA functional test, the network under test needs to be modeled using a distribution network operation simulation system, and the system under test needs to be consistent with each node of the modeled network, that is, it is necessary to build a hardware test environment consistent with the network under test, including a tester and a terminal under test. If only a few nodes of the network under test need to be tested, it is obviously unreasonable to configure a tester and a terminal at the nodes that do not need to be tested. To solve this problem, the distribution network operation simulation system has been expanded to add an on-site FA simulation function, and the simulation function is configured at the nodes that do not need to be connected to the test in the test network, so that the test of the entire network under test can proceed smoothly.

[0032] For distribution terminals at different locations in the distribution network, the local FA system needs to assume different control logics. Therefore, the test system needs to switch multiple roles (export circuit breaker, tie switch, section switch), and the control logic is different for different roles.

[0033] Based on the analysis of the functional characteristics of line outlet protection, section switch controller, interconnection switch controller, etc., a control logic model is established, a computer simulation method is designed, and these control logics are implemented through software.

[0034] The local FA secondary operation simulation model includes line outlet protection device, section switch controller and tie switch controller. The line outlet protection device is used for the protection and measurement of the interval units of each voltage level. It has complete protection, measurement, control, automatic switching of backup power supply and communication monitoring functions, and provides a complete solution for the protection and control of substations, power plants, high and low voltage power distribution and plant power systems, which can effectively guarantee the safe and stable operation of high and low voltage power grids and plant power systems. It can form an automation system through the communication interface together with other protection and automation equipment. All devices can be installed in a centralized manner or installed locally in high and low voltage switch cabinets; the section switch controller (sectionalizer) is used to cooperate with the front-stage switch on the power supply side to automatically open the switch in the case of loss of voltage or current. When a permanent fault occurs, the section switch controller will be locked in the open state after a predetermined number of opening and closing operations, thereby isolating the faulty line section. If the section switch controller fails to complete the predetermined number of opening and closing operations and the fault is removed by other equipment, it will remain in the closed state and will return to the pre-set state after a delay to prepare for the next fault. The section switch controller cannot disconnect the short-circuit fault current; the connecting switch controller is used as a switch that acts as a connecting switch. When one power supply fails during dual power supply, the load of the faulty power supply is transferred to another power supply through the connecting switch to improve power supply reliability.

[0035] On-site FA includes voltage-time type, voltage-current type, and adaptive comprehensive type.

[0036] FA action logic and timing of the voltage-time type system under test: Delay closing logic (functional logic control principle such as Figure 4 shown):

[0037] (1) When both side A and side B lose power at the same time, after time t (t>Z time limit), either side will participate in the power supply, and the system will start timing for X time limit;

[0038] (2) During the X time limit, the power supply side of A and B is restored and no longer cut off. After the timing is completed, the switch is closed;

[0039] (3) During the X time limit timing, if the power supply side of A or B is restored and power is cut off again, the X timer will be reset to zero. After the power supply is restored, the X timer will restart. After the timing is completed, the switch will be closed.

[0040] After these logics are implemented through software simulation, they are deployed on the corresponding monitoring nodes during detection, and can cooperate with the primary and secondary fusion intelligent devices under test to complete the FA function of the entire line.

[0041] A voltage and current power source is used to apply high-fidelity voltage and current signals on the primary side. The voltage and current power source is connected to a voltage and current booster. The voltage and current booster is connected to the switch to be tested through a high-voltage cable. The high-voltage cable connected to the switch to be tested recovers the injected current and voltage through a voltage transformer and a current transformer. The recovered voltage and current are fed back to the voltage and current power source, and the voltage and current power source performs real-time closed-loop adjustment.

[0042] Example 3: Figure 5-Figure 7 As shown in the figure, a high-precision fault inversion method without static error automatic feedback is provided. The method comprises the following steps: setting preset short circuit, grounding and anti-false operation fault scenarios, applying high-fidelity voltage and current signals on the primary side through software and hardware control, verifying the fault analysis, processing function and performance of the intelligent switch, and verifying the fault processing capability of a single device. At the hardware level, the fault inversion test system transfers the load side impedance to the source side through impedance transfer, and controls the current by current feedback. Through a fast-response static error-free automatic feedback control circuit, a large current MOS tube is driven to generate a nonlinear voltage to drive the load loop to obtain a high-precision primary signal, and then a 2-way multi-channel high-precision synchronous sampling measurement method is used to obtain a high-precision measurement result. At the software level, for steady-state signals, the primary output signal is sampled in real time, and the voltage, current and power sources are compensated and corrected according to the load difference of the switch to be tested. For transient signals, the voltage, current and power sources are periodically calibrated and adjusted in segments according to the current output range to ensure that the amplitude, phase, response time and other performance of the primary output signal are reliable.

[0043] The high-precision fault inversion method can realize accurate simulation of a wide range of measurement ranges (current, voltage amplitude, phase and transient characteristics) in primary-side fault injection, and realize continuous adjustment of injected current and voltage, effectively solving the problem that the injected current and voltage of existing detection equipment cannot be continuously adjusted. For transient signals, amplitude and phase calibration and adjustment are regularly performed in segments according to the current output range to ensure the reliability of the amplitude, phase, response time and other performance of the primary output signal.

[0044] Preferably, the above-mentioned primary side applies high-fidelity voltage and current signals using a voltage and current power source, the voltage and current power source is connected to a voltage and current booster, the voltage and current booster is connected to the switch to be tested through a high-voltage cable, the high-voltage cable connected to the switch to be tested recovers the injected current and voltage through a voltage transformer and a current transformer, the recovered voltage and current are fed back to the voltage and current power source, the voltage and current power source performs closed-loop real-time adjustment, and the voltage recovered by the voltage transformer is connected to a high-precision three-phase standard meter as a benchmark for accuracy evaluation.

[0045] Voltage boosting principle (taking phase A as an example): Use a 10 / 0.22kV boost PT to connect the voltage signal Uan output by the power source to the low-voltage side. The output voltage on the high-voltage side is 10 / 0.22*Uan (kV). When the low-voltage side inputs 220V, the high-voltage side output can reach 10kV.

[0046] Preferably, the above-mentioned two-way multi-channel high-precision synchronous sampling measurement method includes a two-way synchronous sampling measurement system, such as Figure 2 As shown, the dual-channel synchronous sampling measurement system (multi-function standard meter) includes two 16 channels, a sampling board, a connecting board and a main board (ARM), each 8 channels (including 4U channels and 4I channels) are connected to a sampling board, the sampling board is connected to the connecting board, the connecting board is connected to the main board, the connecting board is also connected to the LCD conversion board and the front panel and the power board, the power board is connected to the power terminal, the main board is connected to the communication interface, the synchronous sampling measurement method is: the voltage and current signals of the 16-channel circuit are converted into AC input signals with an amplitude of -5V to +5V through the voltage transformer and the current transformer, and then A low-pass filter circuit is used to filter it, and the filtered signal is synchronously sampled and held through a sampling / holding circuit to turn it into a discrete signal. The sampling / holding circuit adopts a synchronous sampling and time-sharing conversion method, that is, a circuit composed of two 8-channel synchronous sampling and synchronous holding A / D converters. The first stage of the circuit adopts a low zero drift amplifier circuit, and the second stage adopts a low-pass filter follower. At each sampling point, the A / D converter must perform A / D conversion on multiple channels separately, calculate the phase difference of each channel point, and use frequency measurement and tracking phase-locked method to synchronize the 2-way A / D sampling again.

[0047] The design concept of synchronous sampling and time-sharing conversion can save costs. Only two 8-channel synchronous sampling and synchronous holding A / D converters are used. The first stage of the circuit adopts a low zero-drift amplifier circuit to improve the anti-interference ability of the input signal. The second stage adopts a low-pass filter follower to increase the output impedance and reduce the influence of the current in the circuit. At the same time, the angular difference caused by the phase of each channel affected by the resistance and capacitance is reduced. The present invention can achieve improved measurement accuracy and speed.

[0048] The multi-function standard meter is designed with a multi-channel accuracy test system in conjunction with the three-phase power to simulate actual working conditions on site and improve detection efficiency. The multi-function standard meter adopts dual high-speed processors and a large-scale logic array structure. The ADI 400MHz DSP combined with the CPLD is responsible for sampling and calculation, and the ARM is responsible for display and communication.

[0049] Preferably, the voltage and current signals of the above-mentioned 16-channel circuit are collected by a multifunctional standard meter capable of collecting 2 channels with a total of 16 channels, each channel including 4U channels and 4I channels. The multifunctional standard meter samples the analog signals of 2 channels and 16 channels, and calculates various voltages, currents and powers.

[0050] Preferably, the first 8 channels are analog large signals with a voltage range of 0-456V. They are sampled by high-precision resistor voltage division, and the output end is connected to the amplifier OP2177 to follow and increase the output impedance, and the analog switch is used to switch the gear, and the signals are sent to AD for simultaneous sampling; the current range is 0-20A, which is converted into a small current signal (0-20mA) by a current transformer, and then converted into a voltage signal by a sampling resistor, and the analog switch is used to switch the gear, and finally the signals are sent to AD for simultaneous sampling; the second 8 channels are analog small signals with a voltage range of 0-10V, and differential input is used to improve the anti-interference ability of the signal. The output impedance is increased by using the amplifier OP2177 output, and the signals are sent to an instrument amplifier with gain to process the signals, and the high-frequency clutter signals in the environment are filtered out, and finally the signals are sent to AD for simultaneous sampling; the 2-channel 16 analog channels use high-precision low-temperature drift devices to ensure that the adopted signals change less than 10ppm over time and temperature; the addition of a bandpass filter eliminates the influence of the environment on the signal, and ensures that the adopted accuracy of the instrument reaches 0.5%.

[0051] Preferably, the processed signals of the first 8-channel and the second 8-channel are sent to an AD sampler, and the AD sampler uses CPLD and DSP to control two ADs to achieve sampling synchronization, and the synchronization phase error is less than 0.1us.

[0052] Preferably, the AD sampler processes the signal and then sends the sampled data to the CPLD cache through a high-speed serial bus to reach the cache capacity. The DSP reads it out at one time to reduce the DSP occupancy rate. The 16-channel sampled data collected by the DSP simultaneously calculates the voltage, current, power and harmonics to ensure that the data of each cycle is involved in the calculation, realizing seamless sampling and calculation functions. This not only improves the data accuracy of the instrument, but also improves the real-time performance.

[0053] Preferably, the data calculated by the DSP is sent to the ARM via a parallel bus, and the ARM collects the calculated data to realize digital display, graphic display, statistics, and analysis functions according to customer needs.

[0054] Preferably, the multifunctional standard meter is provided with an Ethernet communication interface and a serial communication interface, which is convenient for communicating with various types of instruments and meters. The Ethernet communication interface adopts an RJ45 interface, 10 / 100M adaptive, and the serial communication interface adopts RS232 / RS485, and its configuration parameters can be read and compared through the protocol to check whether the parameter settings are correct.

[0055] How to connect the multi-function meter to the test system Figure 3As shown. The current and voltage signals injected into the switch on the high-voltage side are collected as reference signals; the current and voltage signals on the PT and CT sides are collected at the same time, and the ratio difference and angle difference are tested with high precision with the reference signal. This method reduces the accuracy requirements of the primary signal power source. As long as the source output remains stable, high-precision test results can be obtained, and automated testing can be achieved.

[0056] Preferably, the voltage booster and current booster comprises a voltage booster and a current booster; the low voltage side of the voltage booster is connected to the voltage signal output by the power source, one end of the high voltage side is connected to the input port of the switch to be tested, and the other end is connected to the ground, so that the switch to be tested can collect the primary voltage. The requirements of simulating high voltage lines are met; the output end of the current booster is in the same line with the primary side voltage and current of the switch to be tested, and the output end of the current booster is connected to the switch to be tested using a high voltage isolation type current conversion device.

[0057] Preferably, the transformer primary side of the current conversion device is wound with N turns, and the secondary side is a copper rod passing through the core, and the voltage between the front and rear stages of the transformer is proportional to the number of turns.

[0058] Current conversion principle of current booster: Since the voltage and current are on the same line on the primary side, a high-voltage isolated current conversion device must be used. In current conversion, the principle of energy conservation on the primary and secondary sides of the transformer is used. The primary side (IA, IN) is wound with 6 turns, and the secondary side is a copper rod passing through the core (equivalent to 1 turn of coil). The voltage before and after the transformer is proportional to the number of turns. Assuming that the primary voltage is 6U, the primary current is I initial, the secondary voltage is U, and the secondary current is I times, there is 6U*I initial=U*I times, that is, I times=6 I initial, and the current conversion is increased by 6 times (ideal situation). In fact, due to the existence of transformer leakage inductance, the efficiency of transformer energy transfer cannot reach 100%, and the primary current and secondary current cannot be transmitted according to the above-set parameters. Then, by adding a high-precision sampling CT to the copper rod, the current of the copper rod is monitored in real time and fed back to the power source. Through real-time adjustment of the closed loop, the output accuracy of the large current is guaranteed. At the same time, the output current of the high-precision sampling CT is connected to the high-precision three-phase standard meter as a benchmark for accuracy evaluation.

[0059] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A distribution network on-site FA secondary operation simulation system, characterized by: It includes a line outlet protection device, a section switch controller and a connecting switch controller, wherein the line outlet protection device is used for the protection and measurement of interval units of each voltage level; the section switch controller is used to cooperate with the front-stage switch on the power supply side, and automatically open the switch in the case of loss of voltage or current. When a permanent fault occurs, the section switch controller is locked in the open state after a predetermined number of opening and closing operations; the connecting switch controller is a switch that acts as a connection. When one power supply fails during dual power supply, the load of the faulty power supply is transferred to another power supply through the connecting switch; the distribution network on-site FA secondary operation simulation system includes a detection platform body, and the detection platform body is also provided with a fault inversion test system. The fault inversion method of the system is: setting preset short circuit, grounding and anti-false operation fault scenarios, applying high-fidelity voltage and current signals on the primary side through software and hardware control, verifying the fault analysis, processing functions and performance of the intelligent switch, and verifying the fault handling capability of a single device. At the hardware level, the fault inversion test system uses impedance transfer to transfer the load side impedance The current is transmitted to the source side, and the control current adopts the current feedback method. Through the fast-response, error-free, automatic feedback control circuit, the large current MOS tube is driven to generate a nonlinear voltage to drive the load loop to obtain a high-precision primary signal, and then a 2-way multi-channel high-precision synchronous sampling measurement method is used to obtain a high-precision measurement result; at the software level, for steady-state signals, the primary output signal is collected in real time, and the voltage, current and power sources are compensated and corrected according to the load difference of the switch to be measured; for transient signals, the voltage, current and power sources are regularly calibrated and adjusted for amplitude and phase according to the current output range; the 2-way multi-channel high-precision synchronous sampling measurement method includes a dual-way synchronous sampling measurement system, and the synchronous sampling measurement method is: the voltage and current signals of the circuit of 16 channels are converted into an AC input signal with an amplitude of -5V to +5V through a voltage transformer and a current transformer, and then filtered by a low-pass filter circuit, and the filtered signal is synchronously sampled and held through a sampling / holding circuit to become a discrete signal, and the sampling / holding circuit adopts a synchronous sampling and time-sharing conversion method.

2. A distribution network local FA secondary operation simulation system according to claim 1, characterized in that: The line outlet protection device has the functions of protection, measurement, control, automatic switching of backup power supply and communication monitoring, providing solutions for the protection and control of substations, power plants, high and low voltage power distribution and factory power systems.

3. The simulation method of a distribution network on-site FA secondary operation simulation system according to claim 1 is characterized by: The method is as follows: using the distribution network operation simulation system to add an on-site FA secondary operation simulation system; before the on-site FA secondary operation simulation system performs on-site FA function testing, using the distribution network operation simulation system to model the network under test, building a hardware test environment consistent with the network under test, including a tester and a terminal under test; for distribution terminals at different locations in the distribution network, the on-site FA secondary operation simulation system assumes different control logics, switches multi-role outlet circuit breakers, tie switches and section switches; the control logic is different for different roles; based on the analysis of the functional characteristics of the line outlet protection, section switch controller and tie switch controller, a control logic model is established.

4. The simulation method of the local FA secondary operation simulation system of the distribution network according to claim 3 is characterized by: On-site FA includes voltage-time type, voltage-current type, and adaptive comprehensive type.

5. The simulation method of the local FA secondary operation simulation system of the distribution network according to claim 3 is characterized by: If the section switch controller fails to complete the predetermined number of opening and closing operations and the fault is cleared by other equipment, it will remain in the closed state and return to the pre-set state after a delay, preparing for the next fault.

6. The simulation method of the local FA secondary operation simulation system of the distribution network according to claim 5 is characterized by: Sectional switch controller cannot disconnect short-circuit fault current.

7. The simulation method of the local FA secondary operation simulation system of the distribution network according to claim 4 is characterized by: FA action logic and timing of the voltage-time type system under test: Delay closing logic: (1) When both side A and side B lose power at the same time, after time t (t>Z time limit), either side will participate in the power supply, and the system will start timing for the X time limit; (2) During the X time limit, the power supply side of A and B is restored and no longer cut off. After the timing is completed, the switch is closed; (3) During the X time limit timing, if the power supply side of A or B is restored and power is cut off again, the X timer will be reset to zero. After the power supply is restored, the X timer will restart. After the timing is completed, the switch will be closed.

8. The simulation method of the local FA secondary operation simulation system of the distribution network according to claim 7 is characterized by: During detection, the control logic is deployed on the corresponding monitoring node to cooperate with the primary and secondary fusion intelligent device under test to complete the FA function of the entire line.

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