CN115951155A - Detection method and device for relay protection device - Google Patents

Abstract

The application provides a detection method and a detection device for a relay protection device, wherein the method comprises the following steps: through the appearance structure of the relay protection device and a plurality of functions of the relay protection device, the relay protection device is simulated, so that a relay protection device model is obtained, a worker does not need to detect the relay protection device on the spot, and the working efficiency of the worker is increased. And then testing each function in the model of the relay protection device to obtain a plurality of test results, and determining whether the relay protection device is abnormal or not according to the plurality of test results, thereby completing the detection of the relay protection device. This application need not a large amount of manpowers and detects relay protection device, in addition, through emulation relay protection device model, also need not to wait for the producer to produce relay protection device after just can detect, and this kind of mode has not only increased work efficiency, has also saved check-out time.

Description

Detection method and device for relay protection device

Technical Field

The application relates to the technical field of relay protection, in particular to a detection method and a detection device of a relay protection device.

Background

At present, before a newly-operated substation is built, a relay protection device of the substation needs to be detected, wherein the relay protection device is an automatic measure and device capable of sending a warning signal to an operation attendant in time or directly sending a trip command to a controlled circuit breaker to terminate the development of events when a fault occurs in a power element (such as a transformer, a line and the like) in a power system or the power system itself to endanger the safe operation of the power system. Generally, after a relay protection device is produced by a manufacturer, a professional worker is required to perform detection, and a general detection unit includes a plurality of units such as a management department, an operation and maintenance unit, a design unit, a construction (debugging) unit and the like. However, in the prior art, a plurality of relay protection devices are required for one substation, which results in a large amount of manpower for detecting the plurality of relay protection devices, and if the number of people per unit is small, the workload of workers is increased, and the work efficiency of acceptance check is also caused. Moreover, the workers need to manually check each function of each relay protection device on site one by one, and the working efficiency is low. In addition, the detection of the relay protection device needs to wait for the manufacturer to finish the production of the relay protection device before the relay protection device can be detected, and the detection workload is undoubtedly increased.

Disclosure of Invention

The present application is proposed to solve the above-mentioned technical problems. The embodiment of the application provides a detection method and device for a relay protection device, and solves the problem that in the prior art, a large amount of manpower is needed to check and accept the relay protection device.

According to an aspect of the present application, there is provided a detection method for a relay protection device, including:

simulating the relay protection device according to the appearance structure of the relay protection device and a plurality of functions of the relay protection device to obtain a relay protection device model;

testing each function in the relay protection device model to obtain a plurality of test results;

and determining whether the relay protection device is abnormal or not according to the plurality of test results.

In an embodiment, the plurality of functions include a current quick-break protection function, wherein testing each function in the relay protection device model to obtain a plurality of test results includes:

and testing the current quick-break protection function in the relay protection device model to obtain a first test result.

In an embodiment, the testing the current quick-break protection function in the relay protection device model to obtain the first test result includes:

introducing a working current larger than a first preset current threshold value into the relay protection device model to obtain a first test result;

the determining whether the relay protection device is abnormal according to the plurality of test results comprises:

and if the first test result indicates that the relay protection device model does not generate a tripping command, determining that the relay protection device is abnormal.

In an embodiment, the plurality of functions includes a pilot differential protection function, wherein testing each function in the model of the relay protection device to obtain a plurality of test results includes:

and testing the pilot differential protection function in the relay protection device model to obtain a second test result.

In an embodiment, the testing the pilot differential protection function in the model of the relay protection device to obtain the second test result includes:

setting the relay protection device model to be in a self-loop mode; wherein the self-loop mode represents self-receiving and transmitting signals;

a first current is introduced into the pole protection device set as the self-loop mode to obtain a differential current; wherein the differential current is greater than a second preset current threshold;

obtaining the second test result according to the differential current;

the determining whether the relay protection device is abnormal according to the plurality of test results comprises:

and if the second test result indicates that the relay protection device model does not generate a trip instruction, determining that the relay protection device is abnormal.

In an embodiment, the plurality of functions include a distance protection function, wherein testing each function in the relay protection device model to obtain a plurality of test results includes:

and testing the distance protection function in the relay protection device model to obtain a third test result.

In an embodiment, the testing the distance protection function in the relay protection device model to obtain the third test result includes:

introducing a second current and a second voltage to the relay protection device model to obtain impedance; wherein the impedance is less than a preset impedance threshold;

obtaining the third test result according to the impedance;

the determining whether the relay protection device is abnormal according to the plurality of test results comprises:

and if the third test result shows that the relay protection device model does not generate a trip instruction, determining that the relay protection device is abnormal.

In an embodiment, the plurality of functions includes a zero sequence protection function, wherein testing each function in the relay protection device model to obtain a plurality of test results includes:

and testing the zero sequence protection function in the relay protection device model to obtain a fourth test result.

In an embodiment, the testing the zero sequence protection function in the relay protection device model to obtain a fourth test result includes:

introducing a third current into the relay protection device model to obtain a zero sequence current; the zero sequence current is larger than a fourth preset current threshold value, and the third current represents a secondary current obtained by a current transformer when a line connected with the relay protection device is in fault;

obtaining the fourth test result according to the zero sequence current;

the determining whether the relay protection device is abnormal according to the plurality of test results comprises:

and if the fourth test result shows that the relay protection device model does not generate a tripping command, determining that the relay protection device is abnormal.

According to another aspect of the present application, there is provided a detection device for a relay protection device, including:

the construction module is used for simulating the relay protection device according to the appearance structure of the relay protection device and a plurality of functions of the relay protection device to obtain a relay protection device model;

the testing module is used for testing each function in the relay protection device model to obtain a plurality of testing results;

and the determining module is used for determining whether the relay protection device is abnormal or not according to the plurality of test results.

The application provides a detection method and a detection device for a relay protection device, wherein the method comprises the following steps: simulating the relay protection device according to the appearance structure of the relay protection device and the multiple functions of the relay protection device to obtain a relay protection device model, testing each function in the relay protection device model to obtain multiple test results, and determining whether the relay protection device is abnormal or not according to the multiple test results. Through the appearance structure of the relay protection device and a plurality of functions of the relay protection device, the relay protection device is simulated, so that a relay protection device model is obtained, workers do not need to detect the relay protection device on site, and the working efficiency of the workers is improved. And then testing each function in the model of the relay protection device to obtain a plurality of test results, and determining whether the relay protection device is abnormal or not according to the plurality of test results, thereby completing the detection of the relay protection device. This application need not a large amount of manpowers and detects relay protection device, in addition, through emulation relay protection device model, also need not to wait for the producer to produce relay protection device after can detect, and this kind of mode has not only increased work efficiency, has also saved check-out time.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.

Fig. 1 is a schematic flowchart of a detection method of a relay protection device according to an exemplary embodiment of the present application.

Fig. 2 is a schematic flowchart of a detection method of a relay protection device according to another exemplary embodiment of the present application.

Fig. 3 is a schematic structural diagram of a detection device of a relay protection device according to an exemplary embodiment of the present application.

Fig. 4 is a schematic structural diagram of a detection device of a relay protection device according to another exemplary embodiment of the present application.

Fig. 5 is a block diagram of an electronic device provided in an exemplary embodiment of the present application.

Detailed Description

Hereinafter, example embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only a few embodiments of the present application, and not all embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein.

Fig. 1 is a schematic flowchart of a detection method of a relay protection device according to an exemplary embodiment of the present application. As shown in fig. 1, the detection method of the relay protection device includes:

step 110: and simulating the relay protection device according to the appearance structure of the relay protection device and a plurality of functions of the relay protection device to obtain a relay protection device model.

In the embodiment of the application, the appearance structure and the mechanical performance of the relay protection device can be modeled by adopting 3D Studio Max software to obtain a three-dimensional model. And then modeling is carried out aiming at the protection principle and the performance of the relay protection device by adopting a graph-model integrated packaging method, and accurate mathematical models of corresponding functions of different devices are constructed and packaged. And (4) carrying out combined communication on the three-dimensional model and the mathematical model to construct a digital twin model of the relay protection device.

The relay protection device model is obtained by simulating the relay protection device, so that detection is not required to be carried out after a manufacturer produces the relay protection device, the detection efficiency is improved, and the detection time is saved. The appearance and the mechanicalness of the relay protection device in the application can be provided by a manufacturer.

Step 120: and testing each function in the relay protection device model to obtain a plurality of test results.

In the embodiment of the application, the relay protection device has a plurality of functions, each function in the relay protection device model is tested to obtain a plurality of test results, and whether the relay protection device is abnormal or not is judged according to the test results.

In the embodiment of the present application, the functions of the relay protection device may include: the protection circuit comprises current protection, voltage protection, gas protection, differential protection, high-frequency protection, distance protection, balance protection, negative sequence and zero sequence protection and direction protection, wherein the current protection comprises overcurrent protection, current quick-break protection, timing-limit overcurrent protection, time-limit-returning overcurrent protection and non-time-limit current quick-break, the voltage protection comprises overvoltage protection, undervoltage protection and zero sequence voltage protection, and the differential protection comprises cross-link differential protection and longitudinal-link differential protection.

Overvoltage protection: preventing the voltage from rising may cause damage to the electrical equipment. The lightning arrester is arranged at the end of a 10KV switching station and at the high-voltage side of a transformer and is mainly used for protecting switching equipment and the transformer (lightning stroke, high potential invasion, accident overvoltage, operation overvoltage and the like); the lightning arrester is installed on the low-voltage side of the transformer to prevent the invasion of lightning wave from the low-voltage side to break down the insulation of the transformer.

Under-voltage protection: the voltage is prevented from suddenly dropping to damage the normal operation of the electrical equipment.

Zero-sequence voltage protection: the relay protection is used for preventing single-phase earth fault caused by insulation damage of one phase of the transformer. The method is mainly used in a three-phase three-wire system neutral point insulated (ungrounded) power system. The primary side of the zero sequence current transformer is a protected circuit (such as three phase lines of a cable), an iron core is sleeved on the cable, and a secondary winding is connected to the current relay; a cable phase wire must be insulated from the ground, and a grounding wire of a cable head must also penetrate through a zero sequence current transformer; the principle is that when the system is in normal operation and in interphase short circuit, zero-sequence current on the primary side is zero (phasor sum), and small unbalanced current is in the secondary side. When the single-phase grounding of the line occurs, the grounding zero sequence current is reflected to the secondary side and flows into the current relay, and when the grounding zero sequence current reaches or exceeds a setting value, the grounding zero sequence current acts and sends out a signal. (the zero sequence current transformer of the transformer is connected in series with the outgoing line copper bar of the zero line terminal).

Gas protection: when a fault occurs in the oil-immersed transformer, the electric arc generated by the short-circuit current decomposes transformer oil and other insulation materials to generate gas (gas), and the gas relay is operated by using gas pressure or impulse. The fault property can be divided into light gas and heavy gas, when the fault is serious, the contact of the gas relay (heavy gas) acts to trip the breaker and send out an alarm signal. The light gas action signal generally only has a signal alarm and does not send out a trip action.

For the reasons of primary investment of the transformer, long-distance transportation, oil filling, oil changing and the like, gas possibly mixed in the oil is accumulated on the upper part of the gas relay (the oil level can be seen to drop through a glass window, and gas is indicated to exist), and when the oil level drops, the gas can be discharged through a gas discharge valve (a screw is unscrewed) at the top of the gas relay until the gas relay is filled with the oil. For safety reasons, it is preferable to vent the gas when the transformer is out of service. Transformers with capacity of 800KVA or above are provided with gas protection.

Differential protection is a protection device that operates in accordance with a differential current generated by a short-circuit fault in a protected device in an electric power system and during protection. It is commonly used as a protection device for a main transformer, a generator and a parallel capacitor.

Transverse differential protection: the differential protection is commonly used for short-circuit protection of a generator and protection of a parallel capacitor, and when each phase of general equipment is a double winding or a double bus, the differential protection is adopted.

Longitudinal differential protection: the protection is usually used as the protection of a main transformer, and is the main protection for specially protecting the internal and external faults of the transformer.

High-frequency protection is a high-reliability relay protection device serving as a main system and a high-voltage long line. Currently, a plurality of 500KV extra-high voltage transmission lines established in China require the protection device with feasibility, selectivity, sensitivity and rapid action. The high-frequency protection is divided into phase difference high-frequency protection; and (4) directional high-frequency protection.

The basic principle of phase difference high frequency protection is protection comparing the phases of currents at both ends. The predetermined current direction is positive when flowing from the bus to the line and negative when flowing from the line to the bus. That is, when the line is in an internal fault, the currents on both sides are in phase and when the line is in an external fault, the currents on both sides are 180 degrees out of phase. The basic working principle of directional high-frequency protection is a protection device which judges internal or external faults of a power transmission line by comparing power directions of two ends of a protected line.

Distance protection: the relay protection is also high-reliability and high-sensitivity relay protection of a main system, also called impedance protection, and the protection is set according to different impedance values of a long line fault point.

Balance protection: this is a protection device that acts as a high voltage shunt capacitor. The relay protection has higher sensitivity, and is suitable for the parallel capacitor bank adopting double star connection. It is a protection device that operates according to an unbalanced current generated when a parallel capacitor fails.

Negative sequence and zero sequence protection: this is the main protection device when asymmetric short circuit faults and earth faults occur in a three-phase power system.

Direction protection: this is a kind of relay protection with directivity. For a system of a ring-shaped power grid or a double-circuit line power supply, when a certain part of a line fails and the direction of fault current accords with the current direction of relay protection setting, the protection device reliably acts to cut off a fault point.

Step 130: and determining whether the relay protection device is abnormal or not according to a plurality of test results.

And judging whether the relay protection device is abnormal or not according to a plurality of test results. And if the relay protection device is abnormal, contacting a worker of a corresponding manufacturer to solve the problem of abnormality of the relay protection device. And if the relay protection device is not abnormal, determining that the relay protection device is detected completely and can be put into use.

The application provides a detection method of a relay protection device, which comprises the following steps: the method comprises the steps of simulating a relay protection device according to an appearance structure of the relay protection device and a plurality of functions of the relay protection device to obtain a relay protection device model, testing each function in the relay protection device model to obtain a plurality of test results, and determining whether the relay protection device is abnormal or not according to the plurality of test results. Through the appearance structure of the relay protection device and a plurality of functions of the relay protection device, the relay protection device is simulated, so that a relay protection device model is obtained, workers do not need to detect the relay protection device on site, and the working efficiency of the workers is improved. And then testing each function in the model of the relay protection device to obtain a plurality of test results, and determining whether the relay protection device is abnormal or not according to the plurality of test results, thereby completing the detection of the relay protection device. This application need not a large amount of manpowers and detects relay protection device, in addition, through emulation relay protection device model, also need not to wait for the producer to produce relay protection device after just can detect, and this kind of mode has not only increased work efficiency, has also saved check-out time.

In one embodiment, step 110 may be implemented as: constructing a three-dimensional model of the relay protection device according to the appearance structure of the relay protection device; modeling a plurality of functions of the relay protection device by adopting a graph-model integrated packaging method to obtain a mathematical model; and constructing the relay protection device model according to the three-dimensional model and the mathematical model.

In the embodiment of the application, the appearance structure and the mechanical performance of the relay protection device can be modeled by adopting 3D Studio Max software to obtain a three-dimensional model. And then modeling is carried out by adopting a graph-model integrated packaging method aiming at the protection principle and performance of the relay protection device, and accurate mathematical models of corresponding functions of different devices are constructed and packaged. And (4) carrying out combined communication on the three-dimensional model and the mathematical model to construct a relay protection device model.

Fig. 2 is a schematic flowchart of a detection method of a relay protection device according to another exemplary embodiment of the present application. As shown in fig. 2, the plurality of functions include a current snap-off protection function, and step 120 may include:

step 121: and testing the current quick-break protection function in the relay protection device model to obtain a first test result.

In the embodiment of the application, the current quick-break protection is set according to the maximum short-circuit current which may occur at the end of the protected equipment or line or the three-phase short-circuit current generated at the secondary side of the transformer. And (4) quick-break protection action, wherein theoretically, the current flow break protection has no time limit. That is, the circuit breaker is cut off with a time limit operation of zero second or less. Overcurrent protection and current snap-off protection are often used in combination as a primary protection for a device or line and a backup protection for an adjacent line.

Generally, the judgment basis of the current quick-break protection is that the working current of the relay protection device is greater than a first preset current threshold, which indicates that the working current is large, and it can be determined that a line has a fault, so that the relay protection device should send a trip instruction. It can be understood that if the relay protection device does not issue a trip command, it indicates that the relay protection device is abnormal.

In one embodiment, step 121 may be implemented as: introducing a working current larger than a first preset current threshold value into the relay protection device model to obtain a first test result; step 130 may be embodied as: and if the first test result indicates that the relay protection device model does not generate a tripping command, determining that the relay protection device is abnormal.

In this embodiment of the present application, whether the relay protection device generates a trip instruction may be sequentially determined by applying a working current greater than a first preset cutoff threshold to the relay protection device. If the relay protection device does not generate a tripping command, the relay protection device can be determined to be abnormal.

In one embodiment, step 120 may be implemented as: and testing the pilot differential protection function in the relay protection device model to obtain a second test result.

In the embodiment of the application, the longitudinal differential protection function is generally used as the protection of the main transformer and is the main protection for specially protecting the internal and external faults of the transformer. Generally, two ends of a line are respectively provided with a relay protection device, communication is carried out between the two relay protection devices, the relay protection device at one end sends a signal, the relay protection device at the other end receives the signal, and therefore the relay protection device at the other end can receive the current value of the line. Normally, current flows in from one end of the line and flows out from the other end of the line, so that the sum of the phasors of the currents at the two ends is 0, that is, the differential current is 0. If there is a fault in the middle of the line, a part of the current will flow to ground, so the sum of the currents at both ends of the line is no longer 0, i.e. there is a fault with a differential current not equal to 0. And when the differential current is larger than a second preset current threshold value, the relay protection device generates a tripping instruction.

In one embodiment, step 120 may be implemented as: setting the relay protection device model to be in a self-loop mode; wherein the self-loop mode represents self-receiving and transmitting signals; introducing a first current to the pole protection device set to the self-loop mode to obtain a differential current; wherein the differential current is greater than a second preset current threshold; obtaining a second test result according to the differential current; step 130 may be embodied as: and if the second test result indicates that the relay protection device model does not generate a trip instruction, determining that the relay protection device is abnormal.

In the embodiment of the present application, the relay protection device at one end of the installation line is set to be an autorotation model, that is, a signal is received automatically, that is, a signal is received and transmitted by itself. And (3) introducing a first current I to the relay protection device, wherein the differential current is equal to 2I. When the differential current is larger than a second preset current threshold value, if the relay protection device generates a tripping command, the relay protection device is determined to be normal, and if the relay protection device does not generate the tripping command, the relay protection device is determined to be abnormal.

In one embodiment, step 120 may be implemented as: and testing the distance protection function in the relay protection device model to obtain a third test result.

In the embodiment of the application, the distance protection is set according to different impedance values of a long line fault point. Usually the measured impedance is equal to the measured voltage/measured current, i.e. the impedance of the whole line. If the line fails, the current will increase because the measurement voltage will drop, which will result in a decrease in the measurement impedance, i.e. the impedance of the entire line.

In one embodiment, step 120 may be implemented as: introducing a second current and a second voltage to the relay protection device model to obtain impedance; wherein the impedance is less than a preset impedance threshold; obtaining a third test result according to the impedance; step 130 may be embodied as: and if the third test result shows that the relay protection device model does not generate a tripping command, determining that the relay protection device is abnormal.

In the embodiment of the application, a second current and a second voltage are introduced into the relay protection device model, so that the impedance is smaller than a preset impedance threshold, and if the relay protection device generates a trip instruction, the relay protection device is determined to be normal. And if the relay protection device does not generate the tripping command, determining that the relay protection device is abnormal.

In one embodiment, step 120 may be implemented as: and testing the zero sequence protection function in the relay protection device model to obtain a fourth test result.

In the embodiment of the present application, zero sequence protection is a main protection function when an asymmetric short circuit fault and a ground fault occur in a three-phase power system. Normally, the zero-sequence current of the relay protection device is 0, and the zero-sequence current is suddenly increased after the ground fault occurs.

In one embodiment, step 120 may be implemented as: introducing a third current into the relay protection device model to obtain a zero sequence current; the zero sequence current is larger than a fourth preset current threshold value, and the third current represents a secondary current obtained by a current transformer when a line connected with the relay protection device is in fault; obtaining a fourth test result according to the zero sequence current; step 130 may be embodied as: and if the fourth test result shows that the relay protection device model does not generate a trip instruction, determining that the relay protection device is abnormal.

In the embodiment of the application, a third current is introduced into the relay protection device model, so that a zero-sequence current is obtained, and the zero-sequence current is greater than a fourth preset current threshold. It can be understood that, under normal conditions, the secondary current of the current transformer may be 1A, and may become 5A after a line fault, so that the secondary current passing through the current transformer after the line fault is introduced to the relay protection device, so as to simulate the secondary current generated by the line fault, and circulate the secondary current to the relay protection device, thereby determining whether the relay protection device generates a trip instruction, and further determining whether the relay protection device is abnormal. And if the relay protection device detects that the zero-sequence current is greater than a fourth preset current threshold value, a tripping instruction is generated. That is, if the relay protection device model generates a trip instruction, it is determined that the relay protection device is normal. And if the relay protection device model does not generate a tripping instruction, determining that the relay protection device is abnormal.

In a three-phase three-wire circuit, the phasor sum of the three-phase currents is equal to zero, i.e. Ia + Ib + Ic =0. If a current transformer is connected into the three-phase three-wire, the induced current is zero. When an electric shock or an electric leakage fault occurs in the circuit, leakage current flows through the loop, the sum of the three-phase current phasors passing through the mutual inductor is unequal to zero, and the sum of the phasors is Ia + Ib + Ic = I (leakage current, namely zero-sequence current). The secondary coil of the mutual inductor has an induced current, the voltage is applied to an electronic amplifying circuit of the detection part and compared with the preset action current value of the protection area device, and if the voltage is larger than the action current, the sensitive relay is actuated to act on the actuating element to trip. The mutual inductor connected with the transformer is called a zero sequence current mutual inductor, the sum of the phasors of the three-phase current is not equal to zero, and the generated current is the zero sequence current.

Fig. 3 is a schematic structural diagram of a detection device of a relay protection device according to an exemplary embodiment of the present application. As shown in fig. 3, the detection device 20 of the relay protection device includes: the building module 201 is configured to simulate the relay protection device according to an appearance structure of the relay protection device and a plurality of functions of the relay protection device to obtain a model of the relay protection device; the testing module 202 is configured to test each function in the relay protection device model to obtain a plurality of test results; and the determining module 203 is configured to determine whether the relay protection device is abnormal according to the multiple test results.

The application provides a relay protection device's detection device includes: the construction module 201 simulates the relay protection device according to the appearance structure of the relay protection device and the multiple functions of the relay protection device to obtain a relay protection device model, the test module 202 tests each function in the relay protection device model to obtain multiple test results, and the determination module 203 determines whether the relay protection device is abnormal according to the multiple test results. Through the appearance structure of the relay protection device and a plurality of functions of the relay protection device, the relay protection device is simulated, so that a relay protection device model is obtained, workers do not need to detect the relay protection device on site, and the working efficiency of the workers is improved. And then testing each function in the model of the relay protection device to obtain a plurality of test results, and determining whether the relay protection device is abnormal or not according to the plurality of test results, thereby completing the detection of the relay protection device. This application need not a large amount of manpowers and detects relay protection device, in addition, through emulation relay protection device model, also need not to wait for the producer to produce relay protection device after just can detect, and this kind of mode has not only increased work efficiency, has also saved check-out time.

Fig. 4 is a schematic structural diagram of a detection device of a relay protection device according to another exemplary embodiment of the present application. As shown in fig. 4, the plurality of functions include a current snap-off protection function, and the test module 202 includes: the first test result unit 2021 is configured to test a current quick-break protection function in the relay protection device model to obtain a first test result.

In an embodiment, the first test result unit 2021 may be specifically configured to: introducing a working current larger than a first preset current threshold value into the relay protection device model to obtain a first test result; the determination module 203 may be specifically configured to: and if the first test result indicates that the relay protection device model does not generate a trip instruction, determining that the relay protection device is abnormal.

In one embodiment, as shown in fig. 4, the plurality of functions includes a pilot differential protection function, and the test module 202 may include: the second test result unit 2022 is configured to test a pilot differential protection function in the relay protection device model to obtain a second test result.

In an embodiment, the second test result unit 2022 may be specifically configured to: setting the relay protection device model to be in a self-loop mode; wherein the self-loop mode represents self-receiving and transmitting signals; a first current is introduced into the pole protection device set as the self-loop mode to obtain a differential current; wherein the differential current is greater than a second preset current threshold; obtaining a second test result according to the differential current; the determination module 203 may be specifically configured to: and if the second test result indicates that the relay protection device model does not generate a trip instruction, determining that the relay protection device is abnormal.

In an embodiment, as shown in fig. 4, the plurality of functions include a distance protection function, and the building module 201 may include: and the third test result unit 2023 is configured to test the distance protection function in the relay protection device model to obtain a third test result.

In an embodiment, the third test result unit 2023 may be specifically configured to: introducing a second current and a second voltage to the relay protection device model to obtain impedance; wherein the impedance is less than a preset impedance threshold; obtaining a third test result according to the impedance; the determining module 203 may be specifically configured to: and if the third test result shows that the relay protection device model does not generate a trip instruction, determining that the relay protection device is abnormal.

In an embodiment, the plurality of functions includes a zero sequence protection function, and the test module 202 may include: the fourth testing unit 2024 is configured to test a zero sequence protection function in the relay protection device model to obtain a fourth testing result.

In an embodiment, the fourth testing unit 2024 may be specifically configured to: introducing a third current into the relay protection device model to obtain a zero sequence current; the zero sequence current is larger than a fourth preset current threshold value, and the third current represents a secondary current obtained by a current transformer when a line connected with the relay protection device is in fault; obtaining a fourth test result according to the zero sequence current; the determination module 203 may be specifically configured to: and if the fourth test result shows that the relay protection device model does not generate a trip instruction, determining that the relay protection device is abnormal.

FIG. 5 illustrates a block diagram of an electronic device in accordance with an embodiment of the application.

As shown in fig. 5, the electronic device 10 includes one or more processors 11 and memory 12.

The processor 11 may be a Central Processing Unit (CPU) or other form of processing unit having data processing capabilities and/or instruction execution capabilities, and may control other components in the electronic device 10 to perform desired functions.

Memory 12 may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, random Access Memory (RAM), cache memory (cache), and/or the like. The non-volatile memory may include, for example, read Only Memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer readable storage medium, and the processor 11 may execute the program instructions to implement the detection method of the relay protection device according to the embodiments of the present application described above and/or other desired functions. Various contents such as an input signal, a signal component, a noise component, etc. may also be stored in the computer-readable storage medium.

In one example, the electronic device 10 may further include: an input device 13 and an output device 14, which are interconnected by a bus system and/or other form of connection mechanism (not shown).

When the electronic device is a stand-alone device, the input means 13 may be a communication network connector for receiving the acquired input signals from the first device and the second device.

The input device 13 may also include, for example, a keyboard, a mouse, and the like.

The output device 14 may output various information including the determined distance information, direction information, and the like to the outside. The output devices 14 may include, for example, a display, speakers, a printer, and a communication network and its connected remote output devices, among others.

Of course, for simplicity, only some of the components of the electronic device 10 relevant to the present application are shown in fig. 5, and components such as buses, input/output interfaces, and the like are omitted. In addition, the electronic device 10 may include any other suitable components depending on the particular application.

The computer program product may be written with program code for performing the operations of embodiments of the present application in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server.

The computer-readable storage medium may take any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may include, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.

Claims (10)

1. A detection method of a relay protection device is characterized by comprising the following steps:

simulating the relay protection device according to the appearance structure of the relay protection device and a plurality of functions of the relay protection device to obtain a relay protection device model;

testing each function in the relay protection device model to obtain a plurality of test results;

and determining whether the relay protection device is abnormal or not according to the plurality of test results.

2. The method for testing a relay protection device according to claim 1, wherein the plurality of functions include a current snap-off protection function, and wherein testing each function in the relay protection device model to obtain a plurality of test results comprises:

and testing the current quick-break protection function in the relay protection device model to obtain a first test result.

3. The method for detecting a relay protection device according to claim 2, wherein the testing a current quick-break protection function in the relay protection device model to obtain a first test result comprises:

introducing a working current larger than a first preset current threshold value into the relay protection device model to obtain a first test result;

the determining whether the relay protection device is abnormal according to the plurality of test results comprises:

and if the first test result indicates that the relay protection device model does not generate a trip instruction, determining that the relay protection device is abnormal.

4. The method according to claim 1, wherein the plurality of functions include a pilot differential protection function, and wherein testing each function in the model of the relay protection device to obtain a plurality of test results comprises:

and testing the pilot differential protection function in the relay protection device model to obtain a second test result.

5. The method for testing a relay protection device according to claim 4, wherein the step of testing the pilot differential protection function in the relay protection device model to obtain the second test result comprises:

setting the relay protection device model to be in a self-loop mode; wherein the self-loop mode represents self-receiving and transmitting signals;

introducing a first current to the pole protection device set to the self-loop mode to obtain a differential current; wherein the differential current is greater than a second preset current threshold;

obtaining the second test result according to the differential current;

the determining whether the relay protection device is abnormal according to the plurality of test results comprises:

and if the second test result indicates that the relay protection device model does not generate a tripping command, determining that the relay protection device is abnormal.

6. The method for testing a relay protection device according to claim 1, wherein the plurality of functions include a distance protection function, and wherein testing each function in the relay protection device model to obtain a plurality of test results comprises:

and testing the distance protection function in the relay protection device model to obtain a third test result.

7. The method for detecting a relay protection device according to claim 6, wherein the step of testing the distance protection function in the relay protection device model to obtain a third test result comprises:

introducing a second current and a second voltage to the relay protection device model to obtain impedance; wherein the impedance is less than a preset impedance threshold;

obtaining the third test result according to the impedance;

the determining whether the relay protection device is abnormal according to the plurality of test results comprises:

and if the third test result shows that the relay protection device model does not generate a trip instruction, determining that the relay protection device is abnormal.

8. The method according to claim 1, wherein the plurality of functions includes a zero sequence protection function, and wherein testing each function in the model of the relay protection device to obtain a plurality of test results comprises:

and testing the zero sequence protection function in the relay protection device model to obtain a fourth test result.

9. The method for detecting a relay protection device according to claim 8, wherein the step of testing the zero sequence protection function in the relay protection device model to obtain a fourth test result comprises:

introducing a third current into the relay protection device model to obtain a zero sequence current; the zero sequence current is larger than a fourth preset current threshold value, and the third current represents a secondary current obtained by a current transformer when a line connected with the relay protection device fails;

obtaining the fourth test result according to the zero sequence current;

the determining whether the relay protection device is abnormal according to the plurality of test results comprises:

and if the fourth test result shows that the relay protection device model does not generate a trip instruction, determining that the relay protection device is abnormal.

10. A detection device of a relay protection device is characterized by comprising:

the construction module is used for simulating the relay protection device according to the appearance structure of the relay protection device and a plurality of functions of the relay protection device to obtain a relay protection device model;

the testing module is used for testing each function in the relay protection device model to obtain a plurality of testing results;

and the determining module is used for determining whether the relay protection device is abnormal or not according to the plurality of test results.

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