High voltage transformer protection outlet pressure plate on-line monitoring method using potential information

Abstract

The application discloses a high-voltage transformer protection outlet pressure plate online monitoring method using potential information, which comprises the following steps: collecting transformer outlet loop potential data; reading the transformer operation state, logically judging, comparing and processing the percentage of characteristic value deviation of the collected potential data to determine whether the pressure plate state is normal; when there are multiple sets of protection devices, the data collected by each set of protection devices are counted and compared; and outputting the judgment result to indicate whether the transformer protection device is working normally. The high-voltage transformer protection outlet pressure plate online monitoring method using potential information provided by the application can collect transformer outlet loop potential data, logically judge and compare the collected data to determine whether the state of the transformer pressure plate is normal. Compared with the traditional monitoring method, the application can directly monitor the state of the transformer pressure plate, so that the related faults and problems of the pressure plate can be found in time, and the safety and reliability of the power system are improved.

Description

Technical Field

[0001] This invention relates to the field of online transformer monitoring technology in power systems, specifically to an online monitoring method for the protection outlet pressure plate of a high-voltage transformer utilizing potential information. Background Technology

[0002] As a crucial piece of equipment in the power system, the stability and reliability of transformer operation directly affect the quality and safety of power supply. However, due to the influence of environmental factors such as heat and vibration during long-term operation, the internal insulation materials of transformers gradually age, leading to transformer failures. The most common failures include electrical breakdown and insulating oil leakage. If transformer protection devices fail to detect and eliminate these failures in a timely manner, it will cause significant losses and threats to the power system.

[0003] Currently, various online monitoring methods exist for transformer protection devices, including those based on acoustic, vibration, and temperature parameters. While these methods can detect transformer faults, they cannot directly monitor the condition of the pressure plates, making it difficult to detect pressure plate-related faults in a timely manner. In fact, the transformer pressure plates are a fault-prone area, and problems such as electrical breakdown and insulating oil leakage are often overlooked or not detected promptly. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the above-mentioned problems, the present invention is proposed.

[0006] Therefore, the technical problem solved by the present invention is that traditional technologies usually adopt contact measurement methods, which require disconnecting the circuit during the measurement process, posing operational risks and safety hazards, and making it difficult to obtain accurate data.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an online monitoring method for the output pressure plate of a high-voltage transformer protection system utilizing potential information, comprising:

[0008] Collect transformer outlet circuit potential data;

[0009] The transformer's operating status is read, and the collected potential data is logically judged, compared, and processed for characteristic value deviation percentage to determine whether the pressure plate status is normal.

[0010] When there are multiple protection devices, the data collected by each protection device are statistically analyzed and compared.

[0011] The output judgment result indicates whether the transformer protection device is working properly.

[0012] As a preferred embodiment of the online monitoring method for the protection outlet pressure plate of a high-voltage transformer utilizing potential information as described in this invention, the potential data acquisition process includes:

[0013] The potential data of the transformer outlet circuit is collected by a non-contact sensor at the lower end of the outlet pressure plate of the transformer protection device. The potential data induced by the DC electric field is transmitted to the acquisition unit. After processing, the acquisition unit sends the data to the collection unit. Through the management unit and the protection and information substation, the data is sent to the dispatch and information protection master station system for analysis and judgment.

[0014] As a preferred embodiment of the online monitoring method for the high-voltage transformer protection outlet pressure plate utilizing potential information described in this invention, the analysis and judgment step includes:

[0015] Read the transformer's operating status;

[0016] When all three sides of the transformer are running, data from the non-contact potential sensor at the lower end of the hard plate of the transformer's three-side protection output circuit is collected and monitored. U1 = -110 ± δ%U 1n If the potential is normal, further determine whether the transformer protection device is a dual configuration. If the status of the three-sided output pressure plates of the first and second sets of protection are both engaged, it is determined that the transformer protection device is correctly and reliably engaged.

[0017] When all three sides of the transformer are operating, but the condition U1 = -110 ± δ%U is not met. 1n If the voltage at the lower end of the output pressure plate of the transformer protection device is detected in real time, the pressure plate status is determined by the logic. If the voltage at the lower end of the U1 of the hard pressure plate of the three output circuits of the transformer protection device is abnormal, the data of the non-contact potential sensor at both ends of the hard pressure plate of each output circuit is collected.

[0018] If the potential satisfies the comparison criterion of U1=U2≠0, where U2 is the upper end potential of the hard platen of the output circuit of the transformer protection device; then it is further determined whether the transformer protection device is a dual configuration. If the output platen status of the first set of protection and the second set of protection are both engaged, it is determined that the transformer protection device is correctly and reliably engaged.

[0019] When the transformer is operating on only two sides, data from the non-contact potential sensor at the lower end of the hard plate of the corresponding protection output circuit on the transformer operating side is collected and detected. U1 = -110 ± δ%U 1n U 1nIf the voltage is the rated value of U1 at the lower end of the hard platen of the output circuit of the transformer protection device, then the voltage is normal. Then it is necessary to further determine whether the transformer protection device is a dual configuration. If the output platen status of the first set of protection and the second set of protection are both engaged, it is determined that the transformer protection device is correctly and reliably engaged.

[0020] When the transformer operates on only two sides, but does not satisfy U1=-110±δ%U 1n At the same time, the voltage level of the transformer protection device is determined by the logic of detecting the potential at the lower end of the output voltage plate. If the voltage level of the U1 at the lower end of the hard voltage plate of the corresponding output circuit of the transformer operating side protection is abnormal, the data of the non-contact potential sensor at both ends of the hard voltage plate of the corresponding output circuit of the operating side is collected.

[0021] If the potential satisfies the comparison criterion of U1=U2≠0, then it is further determined whether the transformer protection device is a dual configuration. If the output pressure plates of the first and second sets of protection are both engaged, it is determined that the transformer protection device is correctly and reliably engaged.

[0022] As a preferred embodiment of the online monitoring method for the high-voltage transformer protection outlet pressure plate using potential information described in this invention, when judging the state of the pressure plate, it is required that the transformer protection device trip outlet hard pressure plate is connected in series in the trip circuit, the circuit breakers on each side of the transformer are in the closed position, the normally open auxiliary contacts are in the closed state, the outlet pressure plate is engaged, the protection does not operate when there is no fault, and the voltage U1 sensed by the sensor in the trip circuit of each side circuit breaker is -110V.

[0023] As a preferred embodiment of the online monitoring method for the protection outlet pressure plate of a high-voltage transformer utilizing potential information as described in this invention, when the transformer is operating normally on each side, it is necessary to confirm whether the potential U1 collected by the non-contact voltage sensor on each side is -110V. The confirmation steps are as follows:

[0024] Setting a threshold value U in the credit guarantee system 1n = -110V and voltage deviation percentage δ%;

[0025] In the credit guarantee system, when U1 is less than 0, the following judgment process is performed:

[0026] If U1 = -110 ± δ%U 1n If the U1 potential is normal, the output is "yes"; otherwise, if the U1 potential is abnormal, the output is "no".

[0027] Determine whether the U1 potential is normal based on the transformer's operating status and the potential values ​​of U1 on each side, and output the results;

[0028] If the output result is yes, proceed to the next step to determine whether the protection device is a dual-set configuration; if the output result is no, proceed to the next step to determine whether U1 = U2 < 0 is satisfied.

[0029] As a preferred embodiment of the online monitoring method for the high-voltage transformer protection outlet pressure plate utilizing potential information described in this invention, when judging the pressure plate status by comparing the potentials at both ends of the transformer protection device outlet pressure plate, if the DC power supply negative terminal voltage is not close to -110V, the potentials of U1 and U2 collected by a non-contact voltage sensor are compared. The steps are as follows.

[0030] Setting a threshold value U in the credit guarantee system abn <0, rated value U n <0;

[0031] In the credit guarantee system, when U1 = U2 < 0, the following judgment process is performed:

[0032] Execute the amplitude comparison formula.

[0033]

[0034] In the formula, f max_amp f min_amp These represent the maximum and minimum amplitudes of the two comparison values, U1 and U2, respectively, where f max_amp =max[U1,U2]、f min_amp =min[U1,U2],f dif This represents the percentage deviation of the amplitude characteristic value.

[0035] Calculate the absolute amplitude difference U abs =f dif U n ;

[0036] If U abs abn If the amplitudes of U1 and U2 are not completely equal, then U1 is considered equal to U2, and the output is "yes"; otherwise, if the amplitudes of the two comparison points U1 and U2 are not completely equal, the output is "no".

[0037] Further judgment is made based on the transformer's operating status and the relationship between U1 and U2 on each side of the transformer, and the results are output.

[0038] If the output result is yes, then further determine the potential of the output circuits U1 and U2 of the dual-set configuration; if the output result is no, then determine that the output pressure plate is abnormally engaged.

[0039] ​The transformer protection device determines the status of the pressure plates by comparing the potentials of the output pressure plates using a non-same-source comparison method. Based on real-time detection of the lower potential of the output pressure plate and real-time comparison of the potentials at both ends of the output pressure plate, the device uses cross-verification by comparing the status of the output pressure plates of different protection devices within the same equipment to ensure the correctness of the output pressure plate status. The pressure plate status determination process is as follows:

[0040] When all three sides of the transformer are running, the potentials of U1 and U2 in the first set of protection output circuits are collected. If U1 = U2 ≠ 0, the output is yes; otherwise, the output is no.

[0041] Collect the potentials of U1 and U2 in the second set of protection output circuits. If U1 = U2 ≠ 0, output "Yes"; otherwise, output "No".

[0042] If both the first set and the second set are true, output "yes"; otherwise, output "no".

[0043] When the transformer is running on both sides, the potentials of U1 and U2 in the first set of protection output circuits are collected. If U1 = U2 ≠ 0, the output is yes; otherwise, the output is no.

[0044] Collect the potentials of U1 and U2 in the second set of protection output circuits. If U1 = U2 ≠ 0, output "Yes"; otherwise, output "No".

[0045] If both the first set and the second set are true, output "yes"; otherwise, output "no".

[0046] If the output result is yes, it is determined that the outlet pressure plate is reliably engaged; if the output result is no, it is determined that the outlet pressure plate is abnormal.

[0047] To solve the above-mentioned technical problems, the present invention also provides the following technical solution: an online monitoring method system for the outlet pressure plate of a high-voltage transformer using potential information, comprising: a non-contact sensor for measuring the potential value of the transformer pressure plate;

[0048] The acquisition unit is used to convert the potential signal acquired by the non-contact sensor into a digital signal, and after amplification and filtering, transmit the data to the aggregation unit.

[0049] The aggregation unit is used to receive data from multiple acquisition units, and to perform data fusion and verification to ensure data accuracy.

[0050] The management unit is used to parse and analyze the data transmitted from the collection unit, realize the monitoring and diagnosis of the transformer pressure plate status, and issue an alarm signal when an abnormality occurs.

[0051] The security information substation is used to transmit alarm signals generated by the management unit to the security information master station system;

[0052] The Baoxin master station system is used to receive alarm signals from multiple Baoxin substations, summarize and analyze them, and provide a human-machine interface for operators to monitor and manage the status of transformer pressure plates.

[0053] As a preferred embodiment of the online monitoring system for transformer pressure plates based on non-contact potential measurement described in this invention, the sensor is not electrically connected to the electrical circuit, and transmits the voltage to the voltage acquisition unit in real time through DC electric field sensing. It has a self-test function, and if an abnormality occurs, it transmits the abnormality alarm to the information protection system. The collection and processing part includes an acquisition unit, an aggregation unit, and a management unit.

[0054] A computer device includes: a memory and a processor; the memory stores a computer program, characterized in that: when the processor executes the computer program, it implements the steps of the method described in any one of the present invention.

[0055] A computer-readable storage medium having a computer program stored thereon, characterized in that: when the computer program is executed by a processor, it implements the steps of the method described in this invention.

[0056] The beneficial effects of this invention are as follows: This invention provides an online monitoring method for the output pressure plate of a high-voltage transformer using potential information. This invention collects potential data of the transformer output circuit using non-contact sensors, and performs logical judgment and comparison on these collected data to determine whether the state of the transformer pressure plate is normal. Compared with traditional monitoring methods, this invention can directly monitor the state of the transformer pressure plate, thereby enabling timely detection of pressure plate-related faults and problems, and online monitoring of the transformer protection device, thus improving the safety and reliability of the power system. Attached Figure Description

[0057] To more clearly illustrate the technical solutions of the embodiments of the present invention,

[0058] To make the above-mentioned objects, features, and advantages of the present invention more apparent, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0059] Figure 1 This is an overall flowchart of an online monitoring method for the output pressure plate of a high-voltage transformer protection system utilizing potential information, provided in one embodiment of the present invention.

[0060] Figure 2This is a schematic diagram of the logic for determining the lower end potential of the outlet pressure plate in an online monitoring method for high-voltage transformer protection outlet pressure plate using potential information, provided in an embodiment of the present invention.

[0061] Figure 3 This is a schematic diagram illustrating the principle of online monitoring method for high-voltage transformer protection outlet pressure plate using potential information, provided in an embodiment of the present invention, for comparing and judging the potential at both ends of the outlet pressure plate.

[0062] Figure 4 This is a schematic diagram illustrating the principle of non-homogeneous comparison of the output pressure plate potential judgment in an online monitoring method for high-voltage transformer protection output pressure plates using potential information, provided in an embodiment of the present invention. Detailed Implementation

[0063] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without inventive effort should fall within the scope of protection of the present invention.

[0064] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0065] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0066] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0067] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0068] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0069] Example 1

[0070] Reference Figures 1-4 As one embodiment of the present invention, an online monitoring method for the protection outlet pressure plate of a high-voltage transformer using potential information is provided, comprising:

[0071] S1: Collect transformer outlet circuit potential data;

[0072] Furthermore, the potential data of the transformer outlet circuit is collected by a non-contact sensor at the lower end of the outlet pressure plate of the transformer protection device. The potential data induced by the DC electric field is transmitted to the acquisition unit, processed by the acquisition unit, and sent to the collection unit. Then, through the management unit and the protection and information substation, it is sent to the dispatch and protection and information master station system for analysis and judgment.

[0073] S2: Read the transformer operating status, perform logical judgment, comparison, and characteristic value deviation percentage processing on the collected potential data, and determine whether the pressure plate status is normal.

[0074] Furthermore, the logic for determining whether the transformer protection device's output pressure plate is correctly engaged is as follows:

[0075] Step 1: Read the transformer's operating status.

[0076] Step 2: When all three sides of the transformer are running, collect data from the non-contact potential sensor at the lower end of the hard plate of the protection output circuit of the transformer three-side transformer, U1 = -110 ± δ%. 1n If the potential is normal, further determine whether the transformer protection device is a dual configuration. If the status of the three-sided output pressure plates of the first and second sets of protection are both engaged, it is determined that the transformer protection device is correctly and reliably engaged.

[0077] When all three sides of the transformer are operating, but the condition U1 = -110 ± δ%U is not met. 1n If the voltage at the lower end of the output pressure plate of the transformer protection device is detected in real time, the pressure plate status is determined by the logic. If the voltage at the lower end of the U1 of the hard pressure plate of the three output circuits of the transformer protection device is abnormal, the data of the non-contact potential sensor at both ends of the hard pressure plate of each output circuit is collected.

[0078] If the potential satisfies the comparison criterion of U1=U2≠0, then it is further determined whether the transformer protection device is a dual configuration. If the output pressure plates of the first and second sets of protection are both engaged, it is determined that the transformer protection device is correctly and reliably engaged.

[0079] Step 3: When the transformer is operating on only two sides, collect data from the non-contact potential sensor at the lower end of the hard plate of the corresponding protection output circuit on the transformer operating side, U1 = -110 ± δ%. 1n If the potential is normal, then it is necessary to further determine whether the transformer protection device is a dual configuration. If the status of the three-sided output pressure plates of the first and second sets of protection are both engaged, it is determined that the transformer protection device is correctly and reliably engaged.

[0080] When the transformer operates on only two sides, but does not satisfy U1=-110±δ%U 1n At the same time, the voltage level of the transformer protection device is determined by the logic of detecting the potential at the lower end of the output voltage plate. If the voltage level of the U1 at the lower end of the hard voltage plate of the corresponding output circuit of the transformer operating side protection is abnormal, the data of the non-contact potential sensor at both ends of the hard voltage plate of the corresponding output circuit of the operating side is collected.

[0081] If the potential satisfies the comparison criterion of U1=U2≠0, then it is further determined whether the transformer protection device is a dual configuration. If the output pressure plates of the first and second sets of protection are both engaged, it is determined that the transformer protection device is correctly and reliably engaged.

[0082] It should be noted that, as Figure 2 As shown, when the voltage level of the output pressure plate of the transformer protection device is determined by the logic of real-time detection of the lower potential of the output pressure plate, the hard pressure plate of the transformer protection device tripping output is connected in series in the tripping circuit. The circuit breakers on each side of the transformer are in the closed position, and their normally open auxiliary contacts are in the closed state. The output pressure plate is engaged, and the protection does not operate if there is no fault, that is, the protection action contact BTJ is open. At this time, the voltage U1 induced by sensor 1 in the tripping circuit of each side circuit breaker is -KM--trip circuit TQ--circuit breaker normally open auxiliary contact--output pressure plate, that is, -110V.

[0083] It should be noted that, Figure 2 In the diagram: +KM represents the positive power supply of the control circuit; -KM represents the negative power supply of the control circuit; BTJ represents the protection action contact; DL represents the circuit breaker auxiliary normally open contact; TQ represents the circuit breaker trip coil; U1 represents the potential collected by sensor 1.

[0084] When the transformer is operating normally on all sides, it is necessary to confirm whether the potential U1 collected by the non-contact voltage sensor on each side is -110V. The confirmation steps are as follows:

[0085] Setting a threshold value U in the credit guarantee system 1n= -110V and voltage deviation percentage δ%;

[0086] In the credit guarantee system, it checks whether U1 is less than 0. If the condition is met, the following judgment process is performed:

[0087] If U1 = -110 ± δ%U 1n If the U1 potential is normal, output "Yes"; otherwise, if the U1 potential is abnormal, output "No".

[0088] If the main transformer operates on all three sides, then the high-voltage side U1 = -110 ± δ%U 1n And on the medium-pressure side, U1 = -110 ± δ%U 1n And on the low-pressure side, U1 = -110 ± δ%U 1n Output "Yes" if the condition is met, otherwise output "No".

[0089] If both sides of the main transformer are operating, with only the high- and medium-voltage sides in operation, then the high-voltage side U1 = -110 ± δ%U 1n And on the medium-pressure side, U1 = -110 ± δ%U 1n Output "Yes" if the condition is met, otherwise output "No".

[0090] If both sides of the main transformer are operating, only the high-voltage and low-voltage sides are in operation, then the high-voltage side U1 = -110 ± δ%U 1n And on the low-pressure side, U1 = -110 ± δ%U 1n Output "Yes" if the condition is met, otherwise output "No".

[0091] If only the medium and low voltage sides of the main transformer are in operation, then the medium voltage side U1 = -110 ± δ%U 1n And on the low-pressure side, U1 = -110 ± δ%U 1n Output "Yes" if the condition is met, otherwise output "No".

[0092] If the output result is yes, proceed to the next step to determine whether the protection device is a dual-set configuration; if the output result is no, proceed to the next step to determine whether U1 = U2 < 0 is satisfied.

[0093] Furthermore, such as Figure 3 As shown, when judging the status of the pressure plate by comparing the potentials at both ends of the output pressure plate of the transformer protection device, if the negative voltage of the DC power supply is not close to -110V, the potentials of U1 and U2 are collected by non-contact voltage sensors 1 and 2 for comparison.

[0094] It should be noted that, Figure 3 In the diagram: +KM represents the positive power supply of the control circuit; -KM represents the negative power supply of the control circuit; BTJ represents the protection action contact; DL represents the circuit breaker auxiliary normally open contact; TQ represents the circuit breaker trip coil; U1 represents the potential collected by sensor 1; U2 represents the potential collected by sensor 2.

[0095] Furthermore, the comparison steps are as follows:

[0096] Setting a threshold value U in the credit guarantee system abn <0, rated value U n <0;

[0097] When the credit guarantee system determines that U1 = U2 < 0, the following judgment process is performed:

[0098] Execute the amplitude comparison formula.

[0099]

[0100] In the formula, f max_amp f min_amp These represent the maximum and minimum amplitudes of the two comparison values, U1 and U2, respectively, where f max_amp =max[U1,U2]、f min_amp =min[U1,U2],f dif This represents the percentage deviation of the amplitude characteristic value.

[0101] Calculate the absolute amplitude difference U abs =f dif U n ;

[0102] If U abs abn If the values ​​are equal, then U1 = U2 and output "Yes"; otherwise, if the amplitudes of the two pairs of comparisons, U1 and U2, are not exactly equal, output "No".

[0103] If the main transformer operates on all three sides, then (high voltage side U1 = U2) and (medium voltage side U1 = U2) and (low voltage side U1 = U2) will output "Yes", otherwise output "No".

[0104] If both sides of the main transformer are operating, and only the high-voltage and medium-voltage sides are operating, then (high-voltage side U1 = U2) and (medium-voltage side U1 = U2), output "Yes", otherwise output "No";

[0105] If both sides of the main transformer are operating, only the high-voltage and low-voltage sides are operating, then (high-voltage side U1 = U2) and (low-voltage side U1 = U2), output "Yes", otherwise output "No";

[0106] If only the medium and low voltage sides of the main transformer are in operation, then (medium voltage side U1 = U2) and (low voltage side U1 = U2), output "Yes", otherwise output "No";

[0107] If the output result is yes, then further determine the potential of the output circuits U1 and U2 of the dual-set configuration; if the output result is no, then determine that the output pressure plate is abnormally engaged.

[0108] ​S3: When there are multiple sets of protection devices, the data collected by each set of protection devices will be statistically analyzed and compared to ensure that the outlet pressure plate is in the correct state.

[0109] Furthermore, such as Figure 4 As shown, the transformer protection device judges the status of the pressure plate by comparing the output pressure plate potentials of non-same source comparison. Its feature is that, based on the logic of judging the pressure plate status by real-time detection of the lower end potential of the output pressure plate of the transformer protection device and the judgment of the pressure plate status by real-time acquisition of the potentials at both ends of the protection output pressure plate, the output pressure plate status of different protection devices of the same equipment is compared and mutually verified to ensure that the output pressure plate status is correct.

[0110] It should be noted that, Figure 4 In the diagram: +KM represents the positive power supply of the control circuit; -KM represents the negative power supply of the control circuit; BTJ represents the protection action contact; DL represents the circuit breaker auxiliary normally open contact; TQ represents the circuit breaker trip coil; U1 represents the potential collected by sensor 1; U2 represents the potential collected by sensor 2.

[0111] Furthermore, when all three sides of the transformer are running, the judgment process is as follows:

[0112] Collect the potential of U1 and U2 of the first set of protection output circuits. If U1 = U2 ≠ 0, output "Yes"; otherwise, output "No".

[0113] Collect the potentials of U1 and U2 in the second set of protection output circuits. If U1 = U2 ≠ 0, output "Yes"; otherwise, output "No".

[0114] If both the first set and the second set are "yes", output "yes"; otherwise, output "no".

[0115] If the output result is yes, it is determined that the outlet pressure plate is reliably engaged; if the output result is no, it is determined that the outlet pressure plate is abnormal.

[0116] S4: Outputs the judgment result, indicating whether the transformer protection device is working properly.

[0117] This embodiment also provides a computing device, including a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to realize the online monitoring method for the high-voltage transformer protection outlet pressure plate using potential information as proposed in the above embodiment.

[0118] This embodiment also provides a storage medium storing a computer program that, when executed by a processor, implements the online monitoring method for the high-voltage transformer protection outlet pressure plate using potential information as proposed in the above embodiments.

[0119] The storage medium proposed in this embodiment and the online monitoring method for the high-voltage transformer protection outlet pressure plate using potential information proposed in the above embodiments belong to the same inventive concept. Technical details not described in detail in this embodiment can be found in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.

[0120] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory, magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory, magnetic variable memory, ferroelectric memory, phase change memory, graphene memory, etc. Volatile memory can include random access memory or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory or dynamic random access memory, etc. The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include blockchain-based distributed databases, etc., and are not limited thereto. The processors involved in the various embodiments provided in this application may be general-purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited thereto.

[0121] Example 2

[0122] The following is an embodiment of the present invention. In order to verify the beneficial effects of the present invention, a simulation experiment was conducted for scientific demonstration.

[0123] First, a set of transformer outlet circuit potential data was collected, where U1 = -110.5V and U2 = -109.8V. The following procedure was followed to make a judgment:

[0124] According to the amplitude comparison formula, the absolute amplitude difference is calculated to be 0.7V. Since 0.7V < 0.1%, it is determined that the amplitudes of the two pairs of comparisons, U1 and U2, are equal, and the output is "Yes".

[0125] The transformer is in operation on all three sides of the main transformer. According to the amplitude comparison formula, the absolute amplitude difference is calculated to be 0.7V. Since 0.7V < 0.1%, it is determined that the amplitudes of the two transformers to be compared, U1 and U2, are equal, so the output is "Yes".

[0126] This transformer has two sets of protection devices. First, the potentials of the first set of protection output circuits U1 and U2 are collected. If U1 = -110.2V and U2 = -110.2V, then the output is "Yes". Then, the potentials of the second set of protection output circuits U1 and U2 are collected. If U1 = -109.9V and U2 = -109.9V, then the output is "Yes".

[0127] Finally, the judgment results of the two protection devices are compared. Since both are "yes", the output is "yes".

[0128] If the final judgment result is "yes", it means that the export pressure plate has been reliably put into operation.

[0129] Our invention employs non-contact sensors to collect potential data from the transformer's output circuit, and then performs logical judgments and comparisons on this collected data to determine whether the transformer's pressure plates are functioning normally. Compared to traditional monitoring methods, this invention achieves direct monitoring of the transformer's pressure plate status, enabling timely detection of pressure plate-related faults and problems, and online monitoring of the transformer's protection devices, thereby improving the safety and reliability of the power system.

[0130] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for online monitoring of the outlet pressure plate of a high-voltage transformer protection system using potential information, characterized in that, include: Collect transformer outlet circuit potential data; The transformer's operating status is read, and the collected potential data is logically judged, compared, and processed for characteristic value deviation percentage to determine whether the pressure plate status is normal. When there are multiple protection devices, the data collected by each protection device are statistically analyzed and compared. Output the judgment result to indicate whether the transformer protection device is working properly; The process of acquiring the potential data includes: The potential data of the transformer outlet circuit is collected by a non-contact sensor at the lower end of the outlet pressure plate of the transformer protection device. The potential data induced by the DC electric field is transmitted to the acquisition unit. After processing by the acquisition unit, it is sent to the collection unit. Through the management unit and the protection and information substation, it is sent to the dispatch protection and information master station system for analysis and judgment. The analysis and judgment steps include, Read the transformer's operating status; When all three sides of the transformer are running, data is collected from the non-contact potential sensor at the lower end of the hard plate of the transformer's three-side protection output circuit, U1=-110±δ%U 1n If the potential is normal, further determine whether the transformer protection device is a dual configuration. If the status of the three-sided output pressure plates of the first and second sets of protection are both engaged, it is determined that the transformer protection device is correctly and reliably engaged. When all three sides of the transformer are operating, but the condition U1=-110±δ%U is not met. 1n If the voltage at the lower end of the output pressure plate of the transformer protection device is detected in real time, the pressure plate status is determined by the logic. If the voltage at the lower end of the U1 of the hard pressure plate of the three output circuits of the transformer protection device is abnormal, the data of the non-contact potential sensor at both ends of the hard pressure plate of each output circuit is collected. If the potential satisfies the comparison criterion U1=U2≠0, where U2 is the upper end potential of the hard platen of the output circuit of the transformer protection device, then it is further determined whether the transformer protection device is a dual configuration. If the output platen status of the first and second sets of protections are both engaged, it is determined that the transformer protection device is correctly and reliably engaged. When the transformer is operating on only two sides, data from the non-contact potential sensor at the lower end of the hard plate of the corresponding protection output circuit on the transformer operating side is collected and detected. U1 = -110 ± δ%U 1n U 1n If the voltage is the rated value of U1 at the lower end of the hard platen of the output circuit of the transformer protection device, then the voltage is normal. Then it is necessary to further determine whether the transformer protection device is a dual configuration. If the output platen status of the first set of protection and the second set of protection are both engaged, it is determined that the transformer protection device is correctly and reliably engaged. When the transformer operates on only two sides, but does not satisfy U1=-110±δ%U 1n At the same time, the voltage level of the transformer protection device is determined by the logic of detecting the voltage level at the lower end of the output voltage level of the transformer protection device in real time. If the voltage level of the U1 at the lower end of the hard voltage level of the corresponding output circuit of the transformer operating side protection is abnormal, the data of the non-contact potential sensor at both ends of the hard voltage level of the corresponding output circuit of the operating side is collected and detected. If the potential satisfies the comparison criterion of U1=U2≠0, then it is further determined whether the transformer protection device is a dual configuration. If the three-sided output pressure plate status of the first and second sets of protection are both engaged, it is determined that the transformer protection device is correctly and reliably engaged. When determining the status of the transformer protection device's output pressure plate by comparing the potentials at both ends, if the DC power supply negative terminal voltage is not close to -110V, the potentials of U1 and U2 collected by a non-contact voltage sensor are compared. The steps are as follows. Setting threshold values ​​in the credit guarantee system <0, rated value < 0; In the credit guarantee system, when U1 = U2 < 0, the following judgment process is performed: Execute the amplitude comparison formula. In the formula, , These are the maximum and minimum values ​​of the two amplitudes to be compared, U1 and U2, respectively. , , This represents the percentage deviation of the amplitude characteristic value. Calculate the absolute amplitude difference = ; like < If the amplitudes of U1 and U2 are not completely equal, then U1 is considered equal to U2, and the output is "yes"; otherwise, if the amplitudes of the two comparison points U1 and U2 are not completely equal, the output is "no". Further judgment is made based on the transformer's operating status and the relationship between U1 and U2 on each side of the transformer, and the results are output. If the output result is yes, then further determine the potential of the output circuits U1 and U2 of the dual-set configuration; if the output result is no, then determine that the output pressure plate is abnormally engaged. The transformer protection device determines the pressure plate status by comparing the output pressure plate potentials of non-same-source devices. Based on real-time detection of the lower potential of the output pressure plate and real-time comparison of the potentials at both ends of the output pressure plate, the device uses cross-verification by comparing the output pressure plate statuses of different protection devices within the same equipment to ensure the correctness of the output pressure plate status. The pressure plate status determination process is as follows: When all three sides of the transformer are running, the potentials of U1 and U2 in the first set of protection output circuits are collected. If U1 = U2 ≠ 0, the output is yes; otherwise, the output is no. Collect the potentials of U1 and U2 in the second set of protection output circuits. If U1 = U2 ≠ 0, output "Yes"; otherwise, output "No". If both the first set and the second set are true, output "yes"; otherwise, output "no". When the transformer is running on both sides, the potentials of U1 and U2 in the first set of protection output circuits are collected. If U1 = U2 ≠ 0, the output is yes; otherwise, the output is no. Collect the potentials of U1 and U2 in the second set of protection output circuits. If U1 = U2 ≠ 0, output "Yes"; otherwise, output "No". If both the first set and the second set are true, output "yes"; otherwise, output "no". If the output result is yes, it is determined that the outlet pressure plate is reliably engaged; if the output result is no, it is determined that the outlet pressure plate is abnormal.

2. The online monitoring method for the output pressure plate of a high-voltage transformer protection system using potential information as described in claim 1, characterized in that: When determining the status of the pressure plate, it is required that the hard pressure plate of the transformer protection device tripping output is connected in the tripping circuit, the circuit breakers on each side of the transformer are in the closed position, the normally open auxiliary contacts are in the closed state, the output pressure plate is engaged, the protection does not operate if there is no fault, and the voltage U1 sensed by the sensor in the tripping circuit of each side of the circuit breaker is -110V.

3. The online monitoring method for the output pressure plate of a high-voltage transformer protection system using potential information as described in claim 2, characterized in that: When the transformer is operating normally on each side, it is necessary to confirm whether the potential U1 collected by the non-contact voltage sensor on each side is -110V. The confirmation steps are as follows: Setting threshold values ​​in the credit guarantee system =-110V and voltage deviation percentage δ% In the credit guarantee system, when U1 is less than 0, the following judgment process is performed: like =-110±δ% If the voltage of U1 is normal, the output will be "yes". Otherwise, if the U1 potential is abnormal, the output will be negative; Determine whether the U1 potential is normal based on the transformer's operating status and the potential values ​​of U1 on each side, and output the results; If the output result is yes, proceed to the next step to determine whether the protection device is a dual-set configuration; If the output result is negative, proceed to the next step to determine whether U1 = U2 < 0 is satisfied.

4. A system for implementing the online monitoring method for the high-voltage transformer protection outlet pressure plate using potential information as described in any one of claims 1 to 3, characterized in that, include: Non-contact sensors are used to measure the potential value of transformer pressure plates; The acquisition unit is used to convert the potential signal acquired by the non-contact sensor into a digital signal, and after amplification and filtering, transmit the data to the aggregation unit. The aggregation unit is used to receive data from multiple acquisition units, and to perform data fusion and verification to ensure data accuracy. The management unit is used to parse and analyze the data transmitted from the collection unit, realize the monitoring and diagnosis of the transformer pressure plate status, and issue an alarm signal when an abnormality occurs. The security information substation is used to transmit alarm signals generated by the management unit to the security information master station system; The Baoxin master station system is used to receive alarm signals from multiple Baoxin substations, summarize and analyze them, and provide a human-machine interface for operators to monitor and manage the status of transformer pressure plates.

5. The system as described in claim 4, characterized in that: The sensor is not electrically connected to the electrical circuit. It senses voltage through a DC electric field and transmits the voltage to the voltage acquisition unit in real time. It has a self-test function. If an abnormality occurs, it will transmit an abnormality alarm to the information protection system. The collection and processing part includes an acquisition unit, an aggregation unit, and a management unit.

6. A computer device, comprising: Memory and processor; The memory stores a computer program, characterized in that: when the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 3.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 3.

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