Transformer substation relay protection device secondary operation error prevention method and system

Abstract

The invention discloses a substation relay protection device secondary operation error prevention method and system, and the method comprises the steps: classifying relay protection device pressing plates according to a sampling pressing plate, a function pressing plate and an outlet pressing plate, and numbering each pressing plate according to the category; setting a verification function control word for each pressing plate, wherein the verification function control word is used for enabling or disabling anti-error logic verification of the pressing plate; and according to the operation state and the operation type of the primary equipment, the pressing plate switching operation is verified according to a preset logic rule, if the rule is met, the operation is opened, and otherwise, the operation is locked. According to the method, an anti-misoperation system of all types of pressing plates is constructed, a configurable verification control word mechanism is introduced, organic combination of rigid locking and flexible authorization is achieved, and protection misoperation or operation refusal caused by improper pressing plate switching sequence is effectively eradicated; the scheme has comprehensiveness, flexibility and high reliability, systematic safety protection is provided for power grid relay protection secondary operation, and the operation and maintenance safety level and the power grid reliability are improved.

Description

Technical Field

[0001] This invention relates to the field of substation control technology, specifically to a method and system for preventing secondary operation errors in substation relay protection devices. Background Technology

[0002] The correct activation of relay protection devices is crucial for ensuring the safe and reliable operation of the power grid. It directly determines whether, in the event of a grid fault, faulty equipment can be isolated quickly and accurately with minimal impact, thereby ensuring the continuous and stable operation of non-faulty equipment. However, in recent years, there have been frequent incidents of maloperation, such as incorrect operation or failure to operate, of protection devices due to improper handling by maintenance personnel when activating or deactivating relay protection switches. These incidents often trigger non-faulty tripping of the power grid and may even expand the scope of the accident, posing a serious threat to the safety and stability of the power grid.

[0003] Currently, the main station and substation monitoring systems and related anti-misoperation interlocking systems used in power systems mainly focus on the operation design of primary equipment (such as circuit breakers and disconnect switches). The interlocking logic for the operation of the voltage plate in the secondary circuit of the relay protection device is relatively weak, and there is a lack of mature products on the market that can systematically and comprehensively realize this function.

[0004] While some patented solutions exist for preventing pressure plate errors, they still have significant limitations in terms of completeness, logical rigor, and scenario adaptability. The patent "Method and System for Preventing Misoperation of Pressure Plates" (CN202110502500) verifies the operation by comparing the pressure plate engagement / disengagement sequence in the operation procedure with that in the preset operation task. The effectiveness of this method highly depends on the correctness of the engagement / disengagement sequence written in the operation ticket. However, currently, operation tickets are still mainly manually prepared, which carries the possibility of errors. If the operation ticket itself contains errors, this method will not achieve effective operation interlocking.

[0005] The patent "Method and System for Preventing Misoperation of Remote Control Soft Pressure Plate in Intelligent Substation" (CN202210823006) determines whether the protection function is correctly activated and issues an alarm by collecting status signals from primary switches, disconnectors, and protection pressure plates. This solution focuses on status monitoring and alarms, but does not involve logical verification or real-time interlocking of the pressure plate activation / deactivation sequence itself.

[0006] The patent "A Method and System for Preventing Misoperation of Outlet Pressure Plates Based on Non-Contact Potential Measurement" (CN202310912674) utilizes non-contact potential measurement technology to obtain the status of the outlet hard pressure plate and combines it with data from the protection and information substation for logical interlocking. This solution mainly targets outlet hard pressure plates and does not cover various soft pressure plates widely used in smart substations, such as SV receiving, protection functions, and GOOSE transmitting, resulting in incomplete coverage for preventing misoperation.

[0007] Therefore, there is an urgent need for a method to prevent erroneous secondary operation of substation relay protection devices to solve the problems existing in the current technology. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a method and system for preventing errors in the secondary operation of substation relay protection devices, which achieves error prevention verification for the activation and deactivation of all types of pressure plates by using fixed logic rules and configurable control words.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention includes the following steps: Step S1: Classify the relay protection device pressure plates into sampling pressure plates, functional pressure plates, and output pressure plates, and number each pressure plate according to its category; Step S2: Set a verification function control word for each pressure plate to enable or disable the anti-misoperation logic verification of the pressure plate, including performing verification when operating the pressure plate, and making the state of the pressure plate participate in the interlocking logic verification of other pressure plate operations; Step S3: Based on the operating status and operation type of the primary equipment, verify the platen engagement / disengagement operation according to preset logic rules. If the operation meets the rules, the operation is opened; otherwise, the operation is locked. As a further improvement of this invention, the sampling plate includes an SV receiving soft plate of the smart station, the functional plate includes a protection function soft plate, and the output plate includes a GOOSE transmitting and receiving soft plate of the smart station.

[0010] As a further improvement of this invention, the setting method of the verification function control word is as follows: setting the control word to "1" indicates that the verification function is enabled, that is, when operating the pressure plate, the error prevention logic verification is performed, and the state of the pressure plate participates in the locking logic verification of other pressure plate operations; otherwise setting it to "0" indicates that the verification function is disabled, and the pressure plate neither performs operation verification nor participates in the logic verification of other pressure plates.

[0011] As a further improvement of this invention, the verification logic when the pressure plate is engaged includes: if the primary equipment is in operation or hot standby state, the maintenance pressure plate is prohibited from being engaged; for the sampling pressure plate, both the function pressure plate and the output pressure plate are in the off state; for the function pressure plate, it is verified that all sampling pressure plates are engaged and all output pressure plates are in the off state; for the output pressure plate, it is verified that both sampling pressure plates and function pressure plates are engaged.

[0012] As a further improvement of this invention, the verification logic when exiting the pressure plate includes: if the primary equipment is in operation or hot standby and only this set of protection is in operation, exiting any pressure plate is prohibited; for the sampling pressure plate, both the verification function pressure plate and the output pressure plate are in the exited state; for the function pressure plate, all output pressure plates are in the exited state and the sampling pressure plate is engaged; for the output pressure plate, direct operation is allowed.

[0013] As a further improvement to this invention, a special task processing step is also included: by setting the pressure plate control word to "0", the verification logic is temporarily disabled, and the engagement / disengagement operation is performed directly.

[0014] As a further improvement to this invention, when a conventional substation has no sampling pressure plate, only the functional pressure plate and the output pressure plate are subjected to error prevention logic verification.

[0015] The present invention also proposes a secondary operation error prevention system for a substation relay protection device, comprising a processor and a computer-readable storage medium connected to each other, wherein the computer-readable storage medium stores a computer program, and the computer program is executed by the processor to implement the steps of the above-described method for preventing errors in the secondary operation of a substation relay protection device.

[0016] The present invention also proposes a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the above-described method for preventing secondary operation errors in a substation relay protection device.

[0017] The present invention also proposes a computer program product, including a computer program, which, when executed by a processor, implements the steps of the above-described method for preventing secondary operation errors of a substation relay protection device.

[0018] Compared with the prior art, the advantages of the present invention are as follows: This invention constructs an anti-misoperation system covering all types of pressure plates, including sampling, function, and output, and innovatively introduces a configurable verification control word mechanism, achieving an organic combination of rigid interlocking and flexible authorization. Its solidified verification logic based on primary equipment status eliminates reliance on manual operation tickets, enabling proactive and intelligent logical judgment and interlocking before operation execution, effectively preventing protection maloperation or failure to operate due to improper pressure plate engagement / disengagement sequence. This solution combines comprehensiveness, flexibility, and high reliability, adapting to different scenarios in smart and conventional stations, providing systematic safety protection for secondary operations of power grid relay protection, and significantly improving operation and maintenance safety and power grid reliability. Attached Figure Description

[0019] Figure 1 This is a flowchart illustrating the method of an embodiment of the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0021] The technical solution adopted in this embodiment is as follows: Figure 1 As shown, it includes the following steps: Step S1: Classify the relay protection device pressure plates into sampling pressure plates, functional pressure plates, and output pressure plates, and number each pressure plate according to its category; the sampling pressure plate is... C i (i=1~M), the functional pressure plate is G j (j=1~N), the outlet pressure plate is K k (k=1~P); Step S2: Set a verification function control word for each pressure plate to enable or disable the error prevention logic verification of that pressure plate; the sampling pressure plate is J. ci The functional pressure plate is J. gj The outlet pressure plate is J. kk This includes performing verification during the operation of the pressure plate, and involving the state of the pressure plate in the interlocking logic verification for the operation of other pressure plates; Step S3: Based on the operating status and operation type of the primary equipment, verify the platen engagement / disengagement operation according to preset logic rules. If the operation meets the rules, the operation is opened; otherwise, the operation is locked. This embodiment has the following advantages: 1. All the pressure plates of the relay protection device are systematically divided into three categories: sampling pressure plates, functional pressure plates, and output pressure plates. Corresponding anti-misoperation verification logic is designed for each type of pressure plate. This completely solves the problem that existing technologies (such as patent CN202310912674) only focus on the output hard pressure plates and ignore the soft pressure plates that are widely used in intelligent stations. It achieves comprehensive and blind-spot-free anti-misoperation coverage for the secondary circuit operation links. 2. This method design covers both the "putting in" and "removing out" key operation scenarios of the pressure plate, and sets strict verification rules for different scenarios and different primary equipment states (running, hot standby, etc.). This two-way, full-process control effectively avoids the failure or malfunction of protection functions that may be caused by the arbitrary putting in or removing of the pressure plate, and ensures that the operation is under the supervision of safety logic at any stage. 3. By introducing the key design of "verification function control word", maintenance personnel can flexibly enable or disable the control word corresponding to each pressure plate according to the actual operation tasks (such as periodic verification, defect handling, maintenance and debugging) and operation mode. This means that the anti-misoperation system is no longer rigid, but customizable. When it is necessary to break through the fixed logic for emergency operation or special maintenance, the operation can be temporarily enabled by setting the control word of a specific pressure plate to "0". This achieves a perfect balance between "rigid interlocking" and "flexible authorization", greatly improving the system's adaptability to complex and changing field conditions. 4. The anti-misoperation logic proposed in this embodiment is based on the working principle of the protection device and the preset "fixed rules" of power grid safety requirements. This interlocking based on the inherent logic of the equipment fundamentally gets rid of the excessive reliance of existing technologies (such as patent CN202110502500) on the correctness of manually written operation tickets, eliminates the risk of the anti-misoperation function failing due to human subjective errors, and greatly improves the reliability and objectivity of the interlocking.

[0022] In a specific application example, the sampling pressure plate includes the SV receiving soft pressure plate of the intelligent station, the functional pressure plate includes the protection function soft pressure plate, and the output pressure plate includes the GOOSE transmitting and receiving soft pressure plate of the intelligent station.

[0023] In a specific application example, the setting method of the verification function control word is as follows: setting the control word to "1" indicates that the verification function is enabled, that is, when operating the pressure plate, the error prevention logic verification is performed, and the state of the pressure plate participates in the interlocking logic verification of other pressure plate operations; otherwise setting it to "0" indicates that the verification function is disabled, and the pressure plate neither performs operation verification nor participates in the logic verification of other pressure plates.

[0024] In specific application examples, the verification logic when the pressure plate is inserted includes: If the primary equipment is in operation or hot standby mode, it is forbidden to put the maintenance pressure plate into operation. For the sampling platen, the verification function platen, and the output platen, both are in the off state; that is: and Otherwise, investment is prohibited; For the functional pressure plates, verify that all sampling pressure plates are engaged and all output pressure plates are disengaged; that is: and Otherwise, investment is prohibited; For the export pressure plate, all sampling pressure plates and functional pressure plates have been verified to be in operation, that is: and Otherwise, investment is prohibited; The pressure plate number corresponds to a value of 0, which represents the exit state, and a value of 1, which represents the input state.

[0025] In specific application examples, the verification logic when the pressure plate is removed includes: If the primary equipment is in operation or hot standby and only this set of protection is in operation, it is forbidden to remove any pressure plates; For the sampling platen, the verification function platen, and the output platen, both are in the off state; that is: and Otherwise, the operation is prohibited; For the functional pressure plates, verify that all output pressure plates are in the deactivated state and the sampling pressure plate is in the activated state; that is: and Otherwise, the operation is prohibited; The pressure plate number corresponds to a value of 0, which represents the exit state, and a value of 1, which represents the input state. For the export pressure plate, direct operation is permitted.

[0026] Taking the activation / deactivation of protection functions for a main transformer with one or two windings as an example, its soft pressure plates include two SV receiving soft pressure plates: a high-voltage side SV activation soft pressure plate and a low-voltage side SV activation soft pressure plate; three functional soft pressure plates: a main protection (differential protection) soft pressure plate, a high-voltage side backup protection soft pressure plate, and a low-voltage side backup protection soft pressure plate; and two output pressure plates: a high-voltage side switch tripping soft pressure plate and a low-voltage side switch tripping soft pressure plate. During normal operation, the pressure plate status and verification control words are set as shown in the table below:

[0027] When the main transformer is in operation, if the high-voltage side SV input soft switch is deactivated, and there is no secondary error prevention check, the high-voltage side current sampling will be zero. The main transformer's differential protection, sensing the differential current, will mistakenly trip both sides of the main transformer, causing the main transformer to trip. However, in this embodiment, when deactivating the high-voltage side SV input switch, both the functional soft switch and the output soft switch must be in the deactivated state, i.e., K1+K2=0 and G1+G2+G3=0. If this condition is not met, operation is prohibited. Even if deactivating the high-voltage side SV input switch causes the main transformer's calculated differential current to be non-zero, the main transformer will not trip because both the differential protection function and the trip output switch are deactivated. Since the backup protection function does not affect the implementation of the differential protection function, the backup protection soft pressure plate on the high voltage side and the backup protection soft pressure plate on the low voltage side can be set without affecting the implementation of the main protection (differential protection) function. Therefore, their corresponding control words, namely Jg2 and Jg3, can be set to 0. Under the same circumstances, when the soft pressure plate on the high voltage side is deactivated, its verification logic becomes K1+K2=0 and G=0, which can also prevent the protection from malfunctioning.

[0028] In specific application examples, special task processing steps are also included: by setting the pressure plate control word to "0", the verification logic is temporarily disabled, and the engagement / disengagement operation is performed directly.

[0029] In specific application examples, when a conventional substation does not have a sampling pressure plate, only the functional pressure plate and the output pressure plate are checked for error prevention logic.

[0030] This embodiment also illustrates a secondary operation error prevention system for a substation relay protection device, including a processor and a computer-readable storage medium connected to each other. The computer-readable storage medium stores a computer program, which is executed by the processor to implement the steps of the above-described method for preventing errors in the secondary operation of a substation relay protection device.

[0031] This embodiment also illustrates a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the above-described method for preventing secondary operation errors in a substation relay protection device.

[0032] This embodiment also illustrates a computer program product, including a computer program that, when executed by a processor, implements the steps of the above-described method for preventing secondary operation errors in a substation relay protection device.

[0033] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0034] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for preventing secondary operation errors in substation relay protection devices, characterized in that, Includes the following steps: Step S1: Classify the relay protection device pressure plates into sampling pressure plates, functional pressure plates, and output pressure plates, and number each pressure plate according to its category; Step S2: Set a verification function control word for each pressure plate to enable or disable the anti-misoperation logic verification of the pressure plate, including performing verification when operating the pressure plate, and making the state of the pressure plate participate in the interlocking logic verification of other pressure plate operations; Step S3: Based on the operating status and operation type of the primary equipment, verify the platen engagement / disengagement operation according to preset logic rules. If the operation meets the rules, the operation is opened; otherwise, the operation is locked.

2. The method for preventing secondary operation errors in a substation relay protection device according to claim 1, characterized in that, The sampling pressure plate includes the SV receiving soft pressure plate of the intelligent station, the functional pressure plate includes the protection function soft pressure plate, and the output pressure plate includes the GOOSE transmitting and receiving soft pressure plate of the intelligent station.

3. The method for preventing secondary operation errors in a substation relay protection device according to claim 1, characterized in that, The setting method for the verification function control word is as follows: setting the control word to "1" indicates that the verification function is enabled, that is, when operating the pressure plate, the error prevention logic verification is performed, and the state of the pressure plate participates in the interlocking logic verification of other pressure plate operations; otherwise setting it to "0" indicates that the verification function is disabled, and the pressure plate neither performs operation verification nor participates in the logic verification of other pressure plates.

4. The method for preventing secondary operation errors in a substation relay protection device according to claim 1, characterized in that, The verification logic when the pressure plate is engaged includes: if the primary equipment is in operation or hot standby, the maintenance pressure plate is prohibited from being engaged; for the sampling pressure plate, both the function pressure plate and the output pressure plate are in the off state; for the function pressure plate, all sampling pressure plates are engaged and all output pressure plates are in the off state; for the output pressure plate, all sampling pressure plates and the function pressure plate are engaged.

5. A method for preventing secondary operation errors in a substation relay protection device according to claim 1, characterized in that, The verification logic when exiting the pressure plate includes: if the primary equipment is in operation or hot standby and only this set of protection is in operation, exiting any pressure plate is prohibited; for sampling pressure plates, both the verification function pressure plates and the output pressure plates are in the exited state; for function pressure plates, all output pressure plates are in the exited state and the sampling pressure plate is in operation; for output pressure plates, direct operation is allowed.

6. A method for preventing secondary operation errors in a substation relay protection device according to claim 1, characterized in that, It also includes special task processing steps: by setting the pressure plate control word to "0", the verification logic is temporarily disabled, and the engagement / disengagement operation is performed directly.

7. A method for preventing secondary operation errors in a substation relay protection device according to claim 1, characterized in that, When a conventional substation does not have a sampling pressure plate, only the functional pressure plate and the output pressure plate are checked for error prevention logic.

8. A secondary operation error prevention system for substation relay protection devices, characterized in that, The device includes an interconnected processor and a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program that is executed by the processor to implement the steps of the method for preventing secondary operation errors of a substation relay protection device as described in any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for preventing secondary operation errors of a substation relay protection device as described in any one of claims 1 to 7.

10. A computer program product, characterized in that, The system includes a computer program that, when executed by a processor, implements the steps of the method for preventing secondary operation errors of a substation relay protection device as described in any one of claims 1 to 7.

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