Polarity verification method and device of relay protection device, electronic equipment and storage medium

Abstract

The invention relates to the technical field of relay line protection, and discloses a polarity verification method and device of a relay protection device, electronic equipment and a storage medium, and the method comprises the steps: collecting secondary current data and voltage data of the relay protection device; generating a hexagonal diagram according to the secondary current data and the voltage data, wherein the hexagonal diagram represents a space-time relationship between the secondary current data and the voltage data; performing polarity identification on the hexagonal diagram to obtain a polarity state of the relay protection device; and verifying the polarity state. The real-time state of the power grid where the relay protection device is located can be rapidly obtained, the manpower demand is reduced, the working efficiency is improved, the power grid operation risk caused by human factors is reduced, and the power grid operation reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of relay line protection, and in particular to a polarity verification method, device, electronic equipment and storage medium of a relay protection device. Background Art

[0002] Newly commissioned relay protection devices and intervals where the overcurrent circuit wiring has been modified all need to be tested for polarity under load. In the past three years, there have been many intervals for comprehensive and automatic transformation, and the workload of testing polarity under load is large. This work can usually only be carried out after the equipment to be repaired is put into operation, and most of the time it is carried out late at night. Substations are generally remote, and there are traffic hazards when going there late at night. In addition, maintenance personnel must complete relevant procedures after arriving at the substation before they can start work, which takes a lot of time and easily causes fatigue. In addition, during the test process, due to deviations in the mental state or technical level of the personnel, it is easy to cause misinterpretation of the test data. If the polarity error is not discovered in time, it may cause the protection device to malfunction or refuse to operate, resulting in serious consequences such as the tripping of the #2 main transformer of the 500kV Guifeng Station on "6.19". Summary of the invention

[0003] The present application proposes a polarity verification method, device, electronic equipment and storage medium for a relay protection device, which improve the recognition accuracy of transformer winding deformation.

[0004] In a first aspect, a polarity verification method for a relay protection device is provided, comprising:

[0005] Collect secondary current and voltage data of relay protection devices;

[0006] generating a hexagonal graph according to the secondary current data and the voltage data, wherein the hexagonal graph represents a spatiotemporal relationship between the secondary current data and the voltage data;

[0007] Performing polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device;

[0008] The polarity state is verified.

[0009] In a second aspect, a polarity verification device for a relay protection device is provided, comprising:

[0010] An acquisition module is used to acquire secondary current data and voltage data of the relay protection device;

[0011] A generating module, configured to generate a hexagonal diagram according to the secondary current data and the voltage data, wherein the hexagonal diagram represents a spatiotemporal relationship between the secondary current data and the voltage data;

[0012] An identification module, used for performing polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device;

[0013] A verification module is used to verify the polarity state.

[0014] Optionally, in some embodiments of the present application, the generating module includes:

[0015] A vectorization submodule, used for vectorizing the secondary current data and the voltage data to obtain current vector data and voltage vector data;

[0016] A generating submodule is used to generate the hexagonal diagram based on the current vector data and the voltage vector data.

[0017] Optionally, in some embodiments of the present application, the generating submodule includes:

[0018] a calculation unit, configured to calculate a phase difference between the current vector data and the voltage vector data;

[0019] A generating subunit is used to generate the hexagonal diagram based on the phase difference, the current vector data and the voltage vector data.

[0020] Optionally, in some embodiments of the present application, the identification module includes:

[0021] A first analysis submodule, used for analyzing the relative position relationship between the current vector and the voltage vector in the hexagonal diagram;

[0022] The first determination submodule is configured to determine the polarity state based on the relative position relationship.

[0023] Optionally, in some embodiments of the present application, the identification module includes:

[0024] A second analysis submodule, used for analyzing the angle relationship between the current vector and the voltage vector in the hexagonal diagram;

[0025] The second determining submodule is configured to determine the polarity state based on the angle relationship.

[0026] Optionally, in some embodiments of the present application, it further includes:

[0027] The display module is used to generate and display polarity error alarm information when it is detected that the polarity state meets the preset alarm condition.

[0028] Optionally, in some embodiments of the present application, the device further includes a determination module, and the determination module is specifically configured to:

[0029] Acquire test preparation information of the relay protection device, wherein the test preparation information is used to verify whether the relay protection device meets the test state;

[0030] If the test preparation information meets the preset test conditions, it is determined that the relay protection device is in the test state.

[0031] In a third aspect, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the polarity verification method of the above-mentioned relay protection device when executing the computer program.

[0032] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the polarity verification method of the above-mentioned relay protection device are implemented.

[0033] The present application provides a polarity verification method, device, electronic device and storage medium for a relay protection device, by collecting secondary current data and voltage data of the relay protection device; generating a hexagonal diagram based on the secondary current data and voltage data, the hexagonal diagram represents the spatiotemporal relationship between the secondary current data and the voltage data; performing polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device; and verifying the polarity state. In the polarity verification scheme of the relay protection device provided in the present application, by real-time collection of the secondary current data and voltage data of the relay protection device, the operating state of the relay protection device can be monitored in real time, a hexagonal diagram is generated by the secondary current data and voltage data, the relationship between the secondary current data and the voltage data is intuitively and clearly displayed, the polarity state of the relay protection device is obtained by identifying the hexagonal diagram, and the polarity state is verified, which is conducive to quickly obtaining the real-time state of the power grid where the relay protection device is located, reducing manpower requirements, improving work efficiency, reducing the risk of power grid operation caused by human factors, improving the reliability of power grid operation, ensuring the correct action of the relay protection device, improving the intelligence level of the power grid where the relay protection device is located, and ensuring the safe and stable operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A flow chart of a polarity verification method for a relay protection device provided in an embodiment of the present application;

[0036] Figure 2 A schematic diagram of an interface showing a hexagonal diagram of a secondary operation and maintenance management and control platform provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of the functional structure of the inference decision engine provided in the embodiment of the present application;

[0038] Figure 4 A structural block diagram of a polarity verification device for a relay protection device provided in an embodiment of the present application;

[0039] Figure 5 A structural block diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0042] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0043] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0044] The polarity verification method of the relay protection device provided by the embodiment of the present invention can be applied to the secondary intelligent operation and maintenance management platform. The secondary intelligent operation and maintenance management platform is a system integrating advanced monitoring, data analysis, automatic control and intelligent decision support, which is used for the operation and maintenance of the power system / power grid and is suitable for the intelligent management of substations or distribution networks. Newly commissioned relay protection devices and intervals where the overcurrent circuit wiring is changed need to be measured with load polarity. In recent years, there are many intervals for comprehensive self-transformation, and the workload of load polarity measurement is large. The load polarity measurement work can generally be carried out after the equipment to be repaired is put into operation, and most of them are carried out late at night. Substations are generally remote, and there are traffic hazards when going there late at night. In addition, after the maintenance personnel arrive at the substation, they need to go through relevant procedures before they can start work, which takes a lot of time and easily causes fatigue. In addition, during the load test process, due to the deviation of the mental state or technical level of the personnel, it is easy to cause the wrong interpretation of the test data. If the polarity error is not discovered in time, it may cause the protection device to malfunction or refuse to operate, resulting in serious consequences such as the tripping of the main transformer. Among them, the secondary intelligent operation and maintenance management platform collects the secondary current data and voltage data of the relay protection device; generates a hexagonal diagram based on the secondary current data and the voltage data, and the hexagonal diagram represents the spatiotemporal relationship between the secondary current data and the voltage data; performs polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device; and verifies the polarity state. In the present invention, by real-time collection of the secondary current data and voltage data of the relay protection device, the operating state of the relay protection device can be monitored in real time, and a hexagonal diagram is generated by the secondary current data and the voltage data to intuitively and clearly display the relationship between the secondary current data and the voltage data. By identifying the hexagonal diagram, the polarity state of the relay protection device is obtained, and the polarity state is verified, which is conducive to quickly obtaining the real-time state of the power grid where the relay protection device is located, reducing manpower requirements, improving work efficiency, reducing the risk of power grid operation caused by human factors, improving the reliability of power grid operation, ensuring the correct action of the relay protection device, and improving the intelligence level of the power grid where the relay protection device is located, and ensuring the safe and stable operation of the power grid. By using the secondary intelligent operation and maintenance platform, it is possible to remotely check whether the polarity of the commissioning interval meets the requirements, avoid the fatigue of personnel caused by rushing to the substation late at night to measure the polarity with load, reduce the workload of team members, avoid the traffic risks of driving late at night, and reduce economic costs. In addition, for other operating interval polarity errors that are not easy to find, they can be seen intuitively through the secondary operation and maintenance platform, and real-time polarity error alarms are issued, reducing the risk of power grid operation.

[0045] See also Figure 1 As shown, Figure 1A flowchart of a polarity verification method for a relay protection device provided in an embodiment of the present invention is provided. The method can be applied to a server. This embodiment is illustrated by applying it to a server. The polarity verification method for a relay protection device includes the following steps:

[0046] 101: Collect secondary current data and voltage data of relay protection device.

[0047] Among them, the relay protection device is a key device used to protect power equipment and lines in the power system. It is mainly used to detect abnormal conditions in the power system, such as overload, short circuit, line break, etc., and automatically cut off the faulty part when necessary to prevent the fault from expanding and protect the stable operation of the power system.

[0048] The secondary current data of the relay protection device refers to the current signal obtained from the primary current through the current transformer, which is usually in the range of several amperes to tens of amperes and is used to monitor and control the relay protection device. The primary current is the main current in the power grid, which is usually in the range of thousands to tens of thousands of amperes.

[0049] The voltage data of the relay protection device refers to the conversion of the potential difference (i.e. high voltage) at various points in the power grid into a low voltage suitable for measurement by instruments and relay protection devices through a voltage transformer. It is used to monitor the operating status of the power grid, such as voltage level, voltage imbalance, phase angle, etc.

[0050] The secondary current information from the current transformer and the voltage signal from the voltage transformer can be received through the built-in measurement and acquisition module of the relay protection device.

[0051] The two-dimensional intelligent operation and maintenance platform can be used to collect the secondary current data and voltage data of the relay protection device in real time.

[0052] It should be noted that the collected secondary current data and voltage data are synchronous, that is, data at the same time or in the same cycle.

[0053] 102: Generate a hexagonal diagram according to the secondary current data and the voltage data.

[0054] The hexagonal diagram represents the spatiotemporal relationship between the secondary current data and the voltage data.

[0055] The time-space relationship can include time synchronization, phase relationship, amplitude ratio, phasor representation, etc. Time-unsynchronized secondary current data and voltage data will affect the judgment of the polarity state of the relay protection device; the phase relationship between the secondary current and voltage determines the direction and type of work (active or reactive) in the power grid, and in relay protection, the correct phase relationship is the prerequisite for ensuring the correct execution of logic such as differential protection and directional protection; the amplitude ratio of secondary current and voltage is determined by the transformation ratio of current transformer and voltage transformer, and the correct amplitude ratio is crucial for protection logic such as differential protection based on secondary current and voltage amplitude comparison; phasor representation enables the relay protection device to process secondary current and voltage data in mathematical form, so as to perform accurate polarity analysis and fault detection.

[0056] The secondary current data and voltage data can be processed by a pre-trained neural network to output vector data, which includes the amplitude and phase angle of each phase current and voltage, and the vector data is mapped to the coordinate system of the hexagonal diagram to generate a hexagonal diagram.

[0057] A preset software algorithm (such as a machine learning algorithm) can be used to automatically draw a hexagonal diagram based on the secondary current data and voltage data.

[0058] 103: Perform polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device.

[0059] After drawing the hexagonal diagram, a machine learning algorithm can be used to identify the polarity of the hexagonal diagram and obtain the polarity state of the relay protection device, thereby intelligently identifying whether the current circuit of the relay protection device meets the requirements of reduced polarity and presenting the polarity state in the most intuitive way on the secondary operation and maintenance platform.

[0060] 104: Verify the polarity state.

[0061] The polarity status can be verified according to the standard polarity status. If the standard polarity status is negative polarity, when the polarity status is negative polarity, it means that the polarity of the relay protection device is normal, and if the polarity status is positive polarity, it means that the polarity status is abnormal. In relay protection devices, "negative polarity" and "positive polarity" usually describe the flow direction of current relative to the protection area. This flow direction is defined by the phase relationship between the current phasor and the voltage phasor. When the current flows into the protected area, it is usually considered to be positive polarity current. On the hexagonal diagram, if the current vector points in the counterclockwise direction of the voltage vector, this indicates that the current is flowing into the area. In differential protection, if the differential current (differential current = inflow current - outflow current) is positive, it indicates that there is a positive polarity current. When the current flows out of the protected area, it is usually considered to be negative polarity current. On the hexagonal diagram, if the current vector points in the clockwise direction of the voltage vector, this indicates that the current is flowing out of the area. In differential protection, if the differential current is negative, it indicates the presence of a negative polarity current.

[0062] For example, in a substation or power station, parallel equipment (such as a three-phase transformer) is connected to other power systems through a loop line. Assuming that the standard polarity state is subtractive polarity, the phase difference standard is between 150 degrees and 180 degrees. When the phase difference is 180 degrees, it is subtractive polarity, and the polarity is normal, indicating that the equipment is not reversed. When the phase difference is 30°, it means that the polarity state is plus polarity, and the polarity is abnormal, indicating that the equipment may be reversed and needs to be corrected in time.

[0063] For example, refer to Figure 2 , when the polarity recognition of the current loop of the relay protection device is real-time, the polarity state is verified according to the standard polarity state. When the polarity state is correct, the conclusion of the polarity state verification is displayed on the display end of the secondary operation and maintenance control platform, that is, "Conclusion: The polarity is correct".

[0064] In one embodiment, generating a hexagonal diagram according to the secondary current data and the voltage data includes:

[0065] Vectorizing the secondary current data and the voltage data to obtain current vector data and voltage vector data;

[0066] The hexagonal diagram is generated based on the current vector data and the voltage vector data.

[0067] The collected secondary current data and voltage data are vectorized, and the angle between the voltage vector and the current vector of each phase is calculated using the vector calculation method; for the voltage vector and current vector of each phase, combined with the power grid model, the power grid topology knowledge graph is used (each component in the power grid (such as generators, transformers, transmission lines, etc.) is represented as a node in the graph, and the relationship between the components (such as the connection method) is represented as an edge) to form a network topology relationship, so as to identify the connection mode of the power grid and the relationship between the components. The protection knowledge graph can be built-in such as Figure 3 The reasoning decision engine shown in the figure automatically deduces the behavior of the power grid in different scenarios, such as load changes and power grid responses when faults occur. It uses visualization technology to display the topological structure and component behavior of the power grid in a graphical interface, making power grid analysis more intuitive and easy to understand. According to the calculated vector angle and power grid model, it has automatic reasoning capabilities, realizes visual deduction, and automatically draws the current and voltage vectors of each phase on the hexagonal diagram. You can also use graphics libraries or drawing software to draw current vector data and voltage vector data on the interface, and mark the amplitude and phase angle to generate a hexagonal diagram. The hexagonal diagram can intuitively display the phase relationship between the current and voltage of each phase, helping to analyze the balance state and potential problems of the power grid.

[0068] Exemplary, reference Figure 2 The current vector data includes the A-phase current vector of the three-phase sensor, i.e., IA, the B-phase current vector, i.e., IB, and the C-phase current vector, i.e., IC; the voltage vector data includes the A-phase voltage vector of the three-phase sensor, i.e., UA, the B-phase voltage vector, i.e., UB, and the C-phase voltage vector, i.e., UC. Through the preset software algorithm (such as the machine learning algorithm) in the secondary intelligent operation and maintenance control platform, the hexagonal diagram is automatically drawn according to the current vector data and the voltage vector data, and the current vector data and the voltage vector data are displayed. Data and polar coordinates P and Q, namely P: -229.22400MVN, Q: -33.37800MVN, UA: 58.72158V / 0.00, UB: 59.33867V / 239.94°, UC: 59.13086V / 119.97°, IA: 0.25204A / 176.40°, IB: 0.25849A / 56.49°, IC: 0.25393A / 292.38°.

[0069] In this embodiment, it is beneficial to quickly obtain the intuitive phase relationship of the power grid, accurately judge and verify the polarity state of the relay protection circuit, so as to more effectively perform power grid analysis, fault diagnosis and operation optimization.

[0070] In one embodiment, the generating the hexagonal diagram based on the current vector data and the voltage vector data comprises:

[0071] calculating a phase difference between the current vector data and the voltage vector data;

[0072] The hexagonal diagram is generated based on the phase difference, the current vector data, and the voltage vector data.

[0073] The current vector data includes the circuit vector, and the voltage vector data includes the voltage vector. For each phase, the phase difference between the current vector and the voltage vector is calculated. The phase difference indicates whether the current leads or lags relative to the voltage. Select one phase as the reference phase, usually phase A, and then draw the vectors of other phases with it as a reference. On the hexagonal diagram, the current vector and voltage vector of each phase are drawn according to the phase difference and amplitude. For example, in the hexagonal diagram, the position of the vector is determined by the phase difference. If the phase difference is positive, the vector will be drawn from the center to the outside; if the phase difference is negative, the vector will be drawn from the outside to the center, and the amplitude and phase angle of each phase, as well as the phase difference, are marked.

[0074] In this embodiment, the phase relationship between current and voltage in the power system can be accurately represented and analyzed, the polarity state of the relay protection device can be judged and verified, and important information can be provided for the stable operation and fault diagnosis of the power grid.

[0075] In one embodiment, the step of performing polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device includes:

[0076] Analyze the relative position relationship between the current vector and the voltage vector in the hexagonal diagram;

[0077] The polarity state is determined based on the relative positional relationship.

[0078] Analyze the alignment between the current vector and the voltage vector of each phase. If the power system is balanced, the current vector is in phase or anti-phase with the voltage vector. According to the relative position between the current vector and the voltage vector, the polarity state is determined. In differential protection, if the differential current vector (inflow current vector minus outflow current vector) points counterclockwise to the reference voltage vector (usually phase A), it is additive polarity; if it points clockwise to the reference voltage vector (usually phase A), it is subtractive polarity.

[0079] In one embodiment, the step of performing polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device includes:

[0080] Analyzing the angular relationship between the current vector and the voltage vector in the hexagonal diagram;

[0081] The polarity state is determined based on the angular relationship.

[0082] The angular relationship is the phase difference between the current vector and the voltage vector. The phase difference refers to the difference in phase between the current vector and the voltage vector. If the current vector leads the voltage vector, the phase difference is positive; if the current vector lags the voltage vector, the phase difference is negative. For differential protection, if the phase of the differential current (the difference between the inflow current and the outflow current) is the same as the phase of the reference voltage vector (the current vector leads), it is usually considered to be additive polarity. If it is opposite (the current vector lags), it is considered to be subtractive polarity.

[0083] For example, the phase difference standard is between 150 degrees and 180 degrees. When the phase difference is 180 degrees, it is subtractive polarity. When the phase difference is 30 degrees, it means that the polarity state is additive polarity, which is abnormal polarity.

[0084] For directional protection, the polarity state determines the direction of the fault current. If the direction of the fault current is consistent with the direction set by the protection device, the protection device should operate.

[0085] The phase difference can also be used to determine the direction of power flow. If the current vector leads the voltage vector, the grid may be absorbing reactive power; if the current vector lags, the grid may be providing reactive power.

[0086] In a three-phase system, the phase angle of each phase current and voltage is analyzed to determine their relative position. If the three-phase current and voltage phase angles are consistent, the system may be balanced; if not, there may be an imbalance or fault.

[0087] In this embodiment, the angular relationship between the current vector and the voltage vector in the hexagonal diagram is accurately analyzed, and the polarity state of the relay protection device is determined accordingly, which is beneficial to the protection and stable operation of the power grid.

[0088] In one embodiment, it further includes:

[0089] When it is detected that the polarity state meets the preset alarm condition, polarity error alarm information is generated and displayed.

[0090] When the polarity state is abnormal, the preset alarm condition is met. For example, if the standard polarity state is negative polarity and the identified polarity state is positive polarity, it means that the polarity is abnormal and the preset alarm condition is met, and the corresponding polarity error alarm information is generated and displayed.

[0091] Set the polarity detection error alarm window to display polarity error warning information (if the polarity status is abnormal, please pay attention) to avoid the situation where polarity errors are difficult to detect during normal operation and cause serious consequences.

[0092] In one embodiment, before collecting the secondary current data and voltage data of the relay protection device, the method further includes:

[0093] Acquire test preparation information of the relay protection device, wherein the test preparation information is used to verify whether the relay protection device meets the test state;

[0094] If the test preparation information meets the preset test conditions, it is determined that the relay protection device is in the test state.

[0095] The test preparation information includes: whether the protection functions such as relay protection devices have exited the reclosing function of the line to be started, the reviewed load test interval, CT group and circuit number; the direction of active and reactive power of the power system, etc.

[0096] If the test preparation information meets the preset test conditions, it means that before the equipment is put into operation with load, all protection functions should be normally put into operation in accordance with the requirements of the formal setting sheet, and the reclosing function of the line to be started should be exited; the load test interval, CT group and circuit number can only be used and the load test work can be carried out after being reviewed and approved; first determine the direction of the active and reactive power of the power system: for the active direction, under normal circumstances, the active power of the line flows from the system power supply side to the load side, and the active power of the main transformer flows from high or medium to low; for the reactive direction, when the reactive load is large and the reactive power supply cannot meet the reactive demand, the system will send reactive power; when the reactive load is small and the reactive power supplied by the reactive power supply is excessive, the excess reactive power will flow to the system, that is, the system will accept reactive power.

[0097] When identifying the polarity of the relay protection device, the load test (i.e. the polarity identification of the relay protection device) should be fixed (i.e. in the hexagonal diagram) with a certain voltage level and a certain phase voltage as the reference, and test the current amplitude and phase of all phases of all changed current loops; the current amplitudes should be equal and there should be no zero-sequence current, and the phases should be arranged in three-phase positive sequence (clockwise) with an alternating angle difference of 120 degrees; if the polarity connection is the same, the phases should be the same, if the polarity connection is opposite, the corresponding phases should differ by 180 degrees; the line differential current and the differential current on each side / branch of the main transformer should be checked by phase, and the vector sum of the corresponding phase current should be close to 0; for three-winding or double-winding transformers and low-voltage double-branch transformers, the load test results of the differential group current on each side of the main transformer should be vector calculated, and the calculation results should be consistent with the differential current displayed by the device (i.e. in the hexagonal diagram shown); the current and voltage phase relationship of high (medium) and low (referring to the composite current when there are double branches) always satisfies the Y / conversion relationship.

[0098] After the load test is completed, the current and voltage phase diagram should be drawn (with active and reactive directions marked). After the drawing is completed, the test results should be compared with the active / reactive values ​​of the corresponding intervals in the monitoring background and the direction of the primary system flow. The three results should be consistent. For 220kV and above protection equipment that is newly commissioned or has changed current circuits, when conducting load tests during the power restoration process, in addition to measuring the A, B, and C three-phase currents, a high-precision clamp ammeter (0.1mA resolution) should be used to measure the N line secondary current value. Generally speaking, the N line current in the line interval is relatively large (usually between a few mA and more than 20 mA), and the N line current in the main transformer interval is relatively small (usually between a few milliamperes and a few mA. If the N line secondary current value is 0, further inspection should be carried out to confirm whether there is looseness or open circuit.

[0099] The above is the polarity verification process of the relay protection device of this application.

[0100] As mentioned above, the present application provides a polarity verification method, device, electronic device and storage medium for a relay protection device, by collecting the secondary current data and voltage data of the relay protection device; generating a hexagonal diagram according to the secondary current data and the voltage data, the hexagonal diagram represents the spatiotemporal relationship between the secondary current data and the voltage data; performing polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device; and verifying the polarity state. In the polarity verification scheme of the relay protection device provided in the present application, by real-time collection of the secondary current data and voltage data of the relay protection device, the operating state of the relay protection device can be monitored in real time, a hexagonal diagram is generated by the secondary current data and the voltage data, and the relationship between the secondary current data and the voltage data is intuitively and clearly displayed. By identifying the hexagonal diagram, the polarity state of the relay protection device is obtained, and the polarity state is verified, which is conducive to quickly obtaining the real-time state of the power grid where the relay protection device is located, reducing manpower requirements, improving work efficiency, reducing the risk of power grid operation caused by human factors, improving the reliability of power grid operation, ensuring the correct action of the relay protection device, and improving the intelligence level of the power grid where the relay protection device is located, and ensuring the safe and stable operation of the power grid.

[0101] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0102] In one embodiment, a polarity verification device for a relay protection device is provided, and the polarity verification device for the relay protection device corresponds one-to-one to the polarity verification method for the relay protection device in the above embodiment. Figure 4As shown, the polarity verification device of the relay protection device includes an acquisition module 201, a determination module 202, an estimation module 203 and an identification module 204, and each functional module is described in detail as follows:

[0103] The acquisition module 201 is used to acquire secondary current data and voltage data of the relay protection device;

[0104] A generating module 202, configured to generate a hexagonal diagram according to the secondary current data and the voltage data, wherein the hexagonal diagram represents a spatiotemporal relationship between the secondary current data and the voltage data;

[0105] An identification module 203, used for performing polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device;

[0106] The verification module 204 is used to verify the polarity state.

[0107] In this embodiment, by collecting the secondary current data and voltage data of the relay protection device; generating a hexagonal diagram according to the secondary current data and the voltage data, the hexagonal diagram represents the spatiotemporal relationship between the secondary current data and the voltage data; performing polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device; and verifying the polarity state. In the polarity verification scheme of the relay protection device provided in the present application, by collecting the secondary current data and voltage data of the relay protection device in real time, the operating state of the relay protection device can be monitored in real time, and a hexagonal diagram is generated by the secondary current data and the voltage data to intuitively and clearly display the relationship between the secondary current data and the voltage data. By identifying the hexagonal diagram, the polarity state of the relay protection device is obtained, and the polarity state is verified, which is conducive to quickly obtaining the real-time state of the power grid where the relay protection device is located, reducing manpower requirements, improving work efficiency, reducing the risk of power grid operation caused by human factors, improving the reliability of power grid operation, ensuring the correct action of the relay protection device, and improving the intelligence level of the power grid where the relay protection device is located, and ensuring the safe and stable operation of the power grid.

[0108] Optionally, in some embodiments of the present application, the generating module 202 includes:

[0109] A vectorization submodule, used for vectorizing the secondary current data and the voltage data to obtain current vector data and voltage vector data;

[0110] A generating submodule is used to generate the hexagonal diagram based on the current vector data and the voltage vector data.

[0111] Optionally, in some embodiments of the present application, the generating submodule includes:

[0112] a calculation unit, configured to calculate a phase difference between the current vector data and the voltage vector data;

[0113] A generating subunit is used to generate the hexagonal diagram based on the phase difference, the current vector data and the voltage vector data.

[0114] Optionally, in some embodiments of the present application, the identification module includes:

[0115] A first analysis submodule, used for analyzing the relative position relationship between the current vector and the voltage vector in the hexagonal diagram;

[0116] The first determination submodule is configured to determine the polarity state based on the relative position relationship.

[0117] Optionally, in some embodiments of the present application, the identification module 203 includes:

[0118] A second analysis submodule, used for analyzing the angle relationship between the current vector and the voltage vector in the hexagonal diagram;

[0119] The second determining submodule is configured to determine the polarity state based on the angle relationship.

[0120] Optionally, in some embodiments of the present application, it further includes:

[0121] The display module is used to generate and display polarity error alarm information when it is detected that the polarity state meets the preset alarm condition.

[0122] Optionally, in some embodiments of the present application, the device further includes a determination module, and the determination module is specifically configured to:

[0123] Acquire test preparation information of the relay protection device, wherein the test preparation information is used to verify whether the relay protection device meets the test state;

[0124] If the test preparation information meets the preset test conditions, it is determined that the relay protection device is in the test state.

[0125] In one embodiment, an electronic device is provided, the internal structure diagram of the electronic device can be as follows: Figure 5As shown. The electronic device includes a processor, a memory, a network interface, a display screen and an input device connected via a system bus. The processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the electronic device is used to communicate with an external server via a network connection. When the computer program is executed by the processor, the functions or steps of a polarity verification method of a relay protection device are implemented.

[0126] In one embodiment, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:

[0127] Collect secondary current data and voltage data of the relay protection device; generate a hexagonal diagram based on the secondary current data and the voltage data, wherein the hexagonal diagram represents the spatiotemporal relationship between the secondary current data and the voltage data; perform polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device; and verify the polarity state.

[0128] In this embodiment, by collecting the secondary current data and voltage data of the relay protection device in real time, the operating status of the relay protection device can be monitored in real time. A hexagonal diagram is generated through the secondary current data and voltage data to intuitively and clearly display the relationship between the secondary current data and the voltage data. By identifying the hexagonal diagram, the polarity state of the relay protection device is obtained and the polarity state is verified, which is conducive to quickly obtaining the real-time status of the power grid where the relay protection device is located, reducing manpower requirements, improving work efficiency, reducing the risks of power grid operation caused by human factors, improving the reliability of power grid operation, ensuring the correct operation of the relay protection device, and improving the intelligence level of the power grid where the relay protection device is located. Ensure the safe and stable operation of the power grid.

[0129] In one embodiment, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0130] Collect secondary current data and voltage data of the relay protection device; generate a hexagonal diagram based on the secondary current data and the voltage data, wherein the hexagonal diagram represents the spatiotemporal relationship between the secondary current data and the voltage data; perform polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device; and verify the polarity state.

[0131] In this embodiment, by collecting the secondary current data and voltage data of the relay protection device in real time, the operating status of the relay protection device can be monitored in real time. A hexagonal diagram is generated through the secondary current data and voltage data to intuitively and clearly display the relationship between the secondary current data and the voltage data. By identifying the hexagonal diagram, the polarity state of the relay protection device is obtained and the polarity state is verified, which is conducive to quickly obtaining the real-time status of the power grid where the relay protection device is located, reducing manpower requirements, improving work efficiency, reducing the risks of power grid operation caused by human factors, improving the reliability of power grid operation, ensuring the correct operation of the relay protection device, and improving the intelligence level of the power grid where the relay protection device is located. Ensure the safe and stable operation of the power grid.

[0132] It should be noted that the above functions or steps that can be implemented by the computer-readable storage medium or electronic device can refer to the relevant descriptions on the server side and the client side in the aforementioned method embodiment. To avoid repetition, they will not be described one by one here.

[0133] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0134] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0135] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A polarity verification method for a relay protection device, characterized in that: include: Collect secondary current and voltage data of relay protection devices; generating a hexagonal graph according to the secondary current data and the voltage data, wherein the hexagonal graph represents a spatiotemporal relationship between the secondary current data and the voltage data; Performing polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device; The polarity state is verified.

2. The polarity verification method of the relay protection device according to claim 1, characterized in that: The generating a hexagonal diagram according to the secondary current data and the voltage data comprises: Vectorizing the secondary current data and the voltage data to obtain current vector data and voltage vector data; The hexagonal diagram is generated based on the current vector data and the voltage vector data.

3. The polarity verification method of the relay protection device according to claim 1, characterized in that: The method of generating the hexagonal diagram based on the current vector data and the voltage vector data comprises: calculating a phase difference between the current vector data and the voltage vector data; The hexagonal diagram is generated based on the phase difference, the current vector data, and the voltage vector data.

4. The polarity verification method of the relay protection device according to claim 1, characterized in that: The step of performing polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device includes: Analyze the relative position relationship between the current vector and the voltage vector in the hexagonal diagram; The polarity state is determined based on the relative positional relationship.

5. The polarity verification method of the relay protection device according to claim 1, characterized in that: The step of performing polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device includes: Analyzing the angular relationship between the current vector and the voltage vector in the hexagonal diagram; The polarity state is determined based on the angular relationship.

6. The polarity verification method of the relay protection device according to claim 1, characterized in that: Also includes: When it is detected that the polarity state meets the preset alarm condition, polarity error alarm information is generated and displayed.

7. The polarity verification method of a relay protection device according to claim 1, characterized in that: Before collecting the secondary current data and voltage data of the relay protection device, the method further includes: Acquire test preparation information of the relay protection device, wherein the test preparation information is used to verify whether the relay protection device meets the test state; If the test preparation information meets the preset test conditions, it is determined that the relay protection device is in the test state.

8. A polarity verification device for a relay protection device, characterized in that: include: An acquisition module is used to acquire secondary current data and voltage data of the relay protection device; A generating module, configured to generate a hexagonal diagram according to the secondary current data and the voltage data, wherein the hexagonal diagram represents a spatiotemporal relationship between the secondary current data and the voltage data; An identification module, used for performing polarity identification on the hexagonal diagram to obtain the polarity state of the relay protection device; A verification module is used to verify the polarity state.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the polarity verification method of the relay protection device according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the polarity verification method of the relay protection device as claimed in any one of claims 1 to 7 are implemented.

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