A protection function status monitoring method and system for relay protection

Abstract

The present invention discloses a protection function state monitoring method and system of relay protection, and the protection function state monitoring method comprises: obtaining all state monitoring signals of relay protection in the current monitoring cycle, and the priority of all state monitoring signals at the end of the previous monitoring cycle; splicing all state monitoring signals of relay protection in the current monitoring cycle into a plurality of abnormal variables matching the read-write sequence according to the priority order based on the priority of all state monitoring signals at the end of the previous monitoring cycle; comparing the abnormal variables of the current monitoring cycle with the abnormal variables at the end of the previous monitoring cycle according to the read-write sequence, giving an alarm message when the comparison is different, and updating the priority of all state monitoring signals after the comparison is completed. The present invention can fully grasp the operating state of the corresponding protection function of relay protection, reduce the difficulty of information acquisition, and improve the efficiency of operation and maintenance personnel in handling abnormal protection functions on site.

Description

Technical Field

[0001] The present invention belongs to the technical field of power system operation and maintenance, and in particular relates to a protection function status monitoring method and system for relay protection. Background Art

[0002] In the power system, there are many factors that affect whether the protection function of the relay protection device can operate reliably and correctly, involving multiple links such as protection device, merging unit, intelligent terminal, export hard pressure plate, optical fiber circuit, switch body control circuit, etc. There are many links, and the abnormal messages of each link are complicated. It is difficult to rely on manual judgment of the correlation between various abnormalities and line protection functions. If there is a problem in any link, the relay protection function actually becomes an exit state. At this time, a fault occurs, and the relay protection may not operate correctly.

[0003] Chinese patent CN114977075A discloses an integrated online monitoring system for soft and hard pressure plates of relay protection, including a pressure plate position sensor, a data acquisition terminal and an online patrol intelligent early warning module. The data acquisition terminal collects the position of the circuit breaker, the position of the soft pressure plate and the position of the knife switch in the relay protection device through communication, and the data acquisition terminal collects the position of the hard pressure plate through the pressure plate position sensor. The online patrol intelligent early warning module receives the information collected by the data acquisition terminal in real time; the online patrol intelligent early warning module identifies the target state of the relay protection device through the operating state of the primary equipment, and compares the current operating state of the relay protection device with its target state in real time, and alarms if they are inconsistent. However, its judgment of the operating state of the primary equipment is targeted at the line, and cannot cover the busbar and transformer, and the judgment criterion only uses the knife switch position, which is not reliable; in addition, the relay protection only monitors the soft and hard pressure plates, which cannot fully reflect the real operating state of the protection function of the relay protection.

[0004] In the prior art, there is a lack of methods for monitoring the protection function status of relay protection in all aspects, which cannot meet the real-time monitoring of relay protection functions. When certain abnormal alarms are generated in the substation, the operation and maintenance personnel cannot accurately determine whether such abnormal information is related to the protection function status of the relay protection, which affects the sensitivity of the operation and maintenance personnel to abnormal handling after defects occur.

[0005] Therefore, how to provide a monitoring method for all aspects of relay protection and timely and accurately corresponding relay protection and abnormal information is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0006] In view of the defects existing in the above-mentioned prior art, the present invention provides a protection function status monitoring method and system for relay protection, which can fully grasp the operating status of the protection function corresponding to the relay protection, reduce the difficulty of obtaining information, and improve the efficiency of operation and maintenance personnel in handling on-site protection function abnormalities.

[0007] In a first aspect, the present invention provides a method for monitoring the protection function status of a relay protection, comprising:

[0008] Obtain all status monitoring signals of relay protection in the current monitoring cycle, and the priorities of all status monitoring signals at the end of the previous monitoring cycle;

[0009] Based on the priorities of all status monitoring signals at the end of the previous monitoring cycle, all status monitoring signals of the relay protection in the current monitoring cycle are spliced ​​into multiple abnormal variables matching the reading and writing order according to the priority order;

[0010] The abnormal variables of the current monitoring cycle are compared with the abnormal variables at the end of the previous monitoring cycle in the order of reading and writing. When the comparison is different, an alarm message is given and the priority of all status monitoring signals is updated after the comparison is completed.

[0011] Furthermore, based on the priorities of all status monitoring signals at the end of the previous monitoring cycle, all status monitoring signals of the relay protection in the current monitoring cycle are spliced ​​into multiple abnormal variables matching the read-write order in order of priority, including:

[0012] According to the protection category of the relay protection and the equipment category of each protection category, all the state monitoring signals of the relay protection in the current monitoring cycle are divided into multiple groups;

[0013] Each group of status monitoring signals is converted into binary storage data, and combined with the priorities of all status monitoring signals at the end of the previous monitoring cycle, the binary storage data corresponding to the status monitoring signals in each group are spliced ​​into abnormal variables matching the read and write order according to the priority order.

[0014] Furthermore, each group of status monitoring signals is converted into binary storage data, and combined with the priorities of all status monitoring signals at the end of the previous monitoring cycle, the binary storage data corresponding to the status monitoring signals in each group are spliced ​​into abnormal variables matching the read and write order according to the priority order, including:

[0015] Determine the binary storage data of all state monitoring signals according to the state abnormality result corresponding to each state monitoring signal in the current monitoring cycle;

[0016] Determine the priority of each state monitoring signal in the corresponding group according to the grouped state monitoring signals and the priorities of all state monitoring signals at the end of the previous monitoring cycle;

[0017] Based on the binary storage data of all state monitoring signals and the priority of each state monitoring signal in the corresponding group, the binary storage data corresponding to the state monitoring signal in each group is spliced ​​in priority order to form an abnormal variable that matches the read and write order.

[0018] Multiple status monitoring signals are formed into abnormal variables through binary storage data. When judging whether there is any abnormal protection function status in the current monitoring cycle, a bitwise comparison is performed with the protection function status result of the previous cycle. It can quickly judge whether changes are found in the multiple status monitoring signals in the current monitoring cycle, and give the result of whether there is any abnormal status.

[0019] Furthermore, the protection categories of relay protection include line protection, busbar protection and transformer protection, the equipment categories include equipment functions and equipment models, line protection, busbar protection and transformer protection are divided according to equipment functions, and all include the device body and secondary equipment. The equipment models of secondary equipment include merging units, intelligent terminals, export hard pressure plates and optical fiber loops.

[0020] Furthermore, when there are multiple sets of the same protection category of relay protection, they each have a corresponding abnormal variable, and the multiple abnormal variables are different only in the abnormal variable naming and binary storage data.

[0021] Furthermore, all status monitoring signals of the relay protection in the current monitoring cycle are obtained, including:

[0022] Obtain the operating data of the primary relay protection equipment, and combine with the preset status judgment rules to collect the status monitoring signal of the corresponding protection category of the relay protection within the current monitoring period.

[0023] Furthermore, the primary equipment includes a circuit breaker, a disconnector and a voltage transformer.

[0024] Furthermore, the preset status determination rules include:

[0025] When the bus voltage collected by the voltage transformer is greater than the corresponding voltage threshold, or when the circuit breaker and the disconnector in any electrical compartment connected to the bus are in the closed state, it is determined that the bus is in operation; otherwise, it is determined that the bus is in the outage state;

[0026] When the circuit breakers and disconnectors in the electrical compartment connected to the line are in the closed state, and the line voltage collected by the voltage transformer or the bus voltage collected by the voltage transformer is greater than the corresponding voltage threshold, it is determined that the line is in operation; otherwise, it is determined that the line is in the outage state;

[0027] When the transformer terminal voltage collected by the voltage transformer is greater than the corresponding voltage threshold, or when the circuit breaker and the isolating switch connected on either side of the transformer are in the closed state, it is determined that the transformer is in operation; otherwise, it is determined that the transformer is in the outage state;

[0028] Furthermore, the state monitoring signal of the relay protection corresponding to the protection category in the current monitoring period is collected, including:

[0029] The abnormal variables corresponding to the lines, buses and / or transformers in the outage state are set to be composed of binary storage data with the state abnormality result being no abnormality;

[0030] Collect status monitoring signals corresponding to the lines, buses and / or transformers in operation.

[0031] Furthermore, the binary storage data corresponding to the status monitoring signal in each group is spliced ​​into abnormal variables matching the read and write order according to the priority order, including:

[0032] The binary storage data corresponding to the state monitoring signal with the highest priority in each group is used as the lowest byte corresponding to the start position of reading and writing; the binary storage data corresponding to all the state monitoring signals in each group are arranged in sequence according to the priority order; until the binary storage data corresponding to the state monitoring signal with the lowest priority is arranged to the highest byte corresponding to the end position of reading and writing, the abnormal variables corresponding to each group of state monitoring signals are obtained.

[0033] Furthermore, each group of status monitoring signals is converted into binary storage data, including:

[0034] Determine the binary storage data of all state monitoring signals according to the state abnormality result corresponding to each state monitoring signal in the current monitoring cycle;

[0035] Among them, when the state abnormality result corresponding to the state monitoring signal in the current monitoring period is abnormal, the corresponding binary storage data is 1, otherwise it is 0.

[0036] Furthermore, according to the protection category of the relay protection and the equipment category of each protection category, all the state monitoring signals of the relay protection in the current monitoring cycle are divided into multiple groups, including:

[0037] Dividing all state monitoring signals of the relay protection in the current monitoring cycle according to the protection category of the relay protection to form a plurality of first signal groups;

[0038] Dividing the status monitoring signals in each first signal group into two groups according to the equipment functions of each protection category to form a plurality of second signal groups;

[0039] Matching the status monitoring signals in each second signal group with the equipment model of each protection category, and providing a plurality of signal sets in the second signal group that match the equipment model;

[0040] The binary storage data corresponding to the state monitoring signal in the signal set are arranged adjacently in the abnormal variable formed by the second signal group.

[0041] Furthermore, the abnormal variables of the current monitoring cycle are compared with the abnormal variables at the end of the previous monitoring cycle in the order of reading and writing, and an alarm message is given when the comparison is different, including:

[0042] Determine whether there is a state monitoring signal of abnormal state according to the abnormal variables of the current monitoring cycle;

[0043] When determining that there is a status monitoring signal with an abnormal state, the abnormal variables formed by each group of status monitoring signals in the current monitoring cycle are compared with the abnormal variables of the corresponding group of status monitoring signals at the end of the previous monitoring cycle in a read-write order, and when they have different binary storage data, the protection category and equipment category corresponding to the different abnormal variables are determined, and a functional status abnormal label is added and a corresponding warning message is generated.

[0044] Furthermore, after the comparison is completed, the priorities of all status monitoring signals are updated, including:

[0045] Obtaining the number of times each state monitoring signal comparison has different binary storage data and the total number of times each state monitoring signal is compared, and determining the probability that each state monitoring signal comparison has different binary storage data;

[0046] According to the determined probability of each state monitoring signal having different binary storage data when compared, the state monitoring signals in each group are arranged from large to small according to the probability of the binary storage data being different when compared to form a priority order from large to small.

[0047] Furthermore, after the comparison is completed, the priorities of all status monitoring signals are updated, including:

[0048] Obtain the number of times that the binary stored data is different in each state monitoring signal comparison and the total number of times each state monitoring signal is compared, and determine the probability that the binary stored data is different in each state monitoring signal comparison;

[0049] Based on the total number of state monitoring signals, the total number of times each state monitoring signal is compared, and the number of state monitoring signals with different binary storage data in each monitoring cycle, the overall abnormality probability of all monitoring cycles is given; wherein each monitoring cycle includes the current monitoring cycle and multiple consecutive monitoring cycles before the current monitoring cycle;

[0050] According to the determined probability of different binary storage data in each state monitoring signal comparison and the overall abnormal probability of all monitoring cycles, the probability of different binary storage data in each state monitoring signal comparison in the next monitoring cycle is given;

[0051] According to the probability of different binary storage data appearing in the comparison of each state monitoring signal in the next monitoring cycle, the state monitoring signals in each group are arranged from large to small according to the probability of different binary storage data appearing in the comparison to form a priority order from large to small.

[0052] Further, when the probability of different binary storage data is the same when comparing the status monitoring signals in the same group in the next monitoring cycle, the priorities of the status monitoring signals with the same probability in the group are arranged according to the priority of the current monitoring cycle.

[0053] Furthermore, the probability of each state monitoring signal being abnormal in the next monitoring cycle satisfies the following relationship:

[0054]

[0055] In the formula, p i is the probability that the binary storage data is different in the comparison of the i-th state monitoring signal in the next monitoring cycle, n is the total number of comparisons for each state monitoring signal, that is, the number of monitoring cycles, m is the number of state monitoring signals, A i is the number of times the binary storage data is different when the i-th state monitoring signal is compared, that is, the number of times the binary storage data is different when the i-th state monitoring signal is compared in n monitoring cycles, B j is the number of state monitoring signals with different binary storage data compared in the jth monitoring cycle, and α is the individual weight of the state monitoring signal, which can be determined according to the specific situation or prior knowledge, for example, α=0.8.

[0056] Furthermore, after the priorities of all status monitoring signals are updated, the following steps are also included:

[0057] Based on the binary storage data of all status monitoring signals in the current monitoring cycle and the priority of each status monitoring signal after update in the corresponding group, the binary storage data corresponding to the status monitoring signal in each group is spliced ​​in the updated priority order to form a new abnormal variable. This can facilitate the rapid judgment of the protection function status in the next monitoring cycle.

[0058] Further, the abnormal variable at the end of the previous monitoring cycle is the abnormal variable updated by the priorities of all state monitoring signals before the end of the previous monitoring cycle.

[0059] In a second aspect, the present invention provides a protection function status monitoring system for relay protection, which adopts the protection function status monitoring method for relay protection, and the protection function status monitoring system comprises:

[0060] A signal acquisition module, which is used to obtain all status monitoring signals of relay protection in the current monitoring cycle, and the priorities of all status monitoring signals at the end of the previous monitoring cycle;

[0061] A variable generation module, which is used to splice all the state monitoring signals of the relay protection in the current monitoring cycle into a plurality of abnormal variables matching the reading and writing order according to the priority order of all the state monitoring signals at the end of the previous monitoring cycle;

[0062] The alarm update module is used to compare the abnormal variables of the current monitoring cycle with the abnormal variables at the end of the previous monitoring cycle in the reading and writing order, give an alarm message when the comparison is different, and update the priority of all status monitoring signals after the comparison is completed.

[0063] In a third aspect, the present invention further provides a computer storage medium, wherein the computer storage medium stores computer instructions, and when the computer instructions are called, they are used to execute the protection function status monitoring method of the above-mentioned relay protection.

[0064] The present invention provides a method and system for monitoring the protection function status of relay protection, which at least have the following beneficial effects:

[0065] (1) Conduct conclusive analysis on the monitoring results of the protection function status, provide clear and inductive alarm information, and prompt the operation and maintenance personnel to handle it in real time. At the same time, provide documented information containing actual alarm information, and inform the location and content of the abnormality in real time, so that the operation and maintenance personnel can fully grasp the operating status of the protection function of the relay protection, reduce the difficulty of obtaining information, and improve the efficiency of the operation and maintenance personnel in handling on-site protection function abnormalities. At the same time, by setting and updating the priority, the sensitivity of the protection function status monitoring of the relay protection can be further improved, and the abnormal protection function can be discovered as early as possible. In addition, by updating the priority of the status monitoring signal, the protection function with abnormality can be predicted, so that when the abnormal variables of the next monitoring cycle are compared, the protection function with abnormal status can be determined more quickly.

[0066] (2) For the line protection, relay protection and transformer protection corresponding to the lines, busbars and transformers, monitor all aspects of the protection function, including the device body, merging unit, intelligent terminal, export hard pressure plate, optical fiber loop, switch body control loop, to achieve comprehensive monitoring of the protection function status.

[0067] (3) By comparing abnormal variables, the location of the different bytes can be determined, thereby locating the type of equipment where the abnormality occurred and its status monitoring signal, further determining the cause of the fault, and issuing timely alarms to guide operation and maintenance personnel to take effective measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 A flow chart of a protection function status monitoring method for relay protection provided by the present invention;

[0069] Figure 2 A flowchart of splicing into abnormal variables for a certain embodiment provided by the present invention;

[0070] Figure 3 A flowchart of updating priority levels according to an embodiment of the present invention;

[0071] Figure 4 A flowchart of a method for monitoring a protection function status according to an embodiment of the present invention;

[0072] Figure 5 A schematic diagram of a protection function status monitoring system for relay protection provided by the present invention. DETAILED DESCRIPTION

[0073] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only 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 making creative work are within the scope of protection of the present invention.

[0074] like Figure 1 As shown, the present invention proposes a protection function status monitoring method for relay protection, comprising:

[0075] Obtain all status monitoring signals of relay protection in the current monitoring cycle, and the priorities of all status monitoring signals at the end of the previous monitoring cycle;

[0076] Based on the priorities of all status monitoring signals at the end of the previous monitoring cycle, all status monitoring signals of the relay protection in the current monitoring cycle are spliced ​​into multiple abnormal variables matching the reading and writing order according to the priority order;

[0077] The abnormal variables of the current monitoring cycle are compared with the abnormal variables at the end of the previous monitoring cycle in the order of reading and writing. When the comparison is different, an alarm message is given and the priority of all status monitoring signals is updated after the comparison is completed.

[0078] The present invention conducts conclusive analysis on the monitoring results of the protection function status, provides clear and inductive alarm information, prompts the operation and maintenance personnel to handle it in real time, and simultaneously provides documented information containing actual alarm information, notifies the location and content of the abnormality in real time, and facilitates the operation and maintenance personnel to fully grasp the operating status of the primary equipment and its corresponding protection function, reduces the difficulty of information acquisition, and improves the efficiency of the operation and maintenance personnel in handling on-site protection function abnormalities.

[0079] Among them, the protection categories of relay protection include line protection, busbar protection and transformer protection. Line protection, busbar protection and transformer protection are divided according to the functions of the equipment, and all include the device body and secondary equipment. The equipment models of the secondary equipment include merging units, intelligent terminals, export hard pressure plates and optical fiber loops.

[0080] like Figure 2 As shown, based on the priorities of all status monitoring signals at the end of the previous monitoring cycle, all status monitoring signals of the relay protection in the current monitoring cycle are spliced ​​into multiple abnormal variables matching the read-write order in order of priority, including:

[0081] According to the protection category of the relay protection and the equipment category of each protection category, all the state monitoring signals of the relay protection in the current monitoring cycle are divided into multiple groups;

[0082] Each group of status monitoring signals is converted into binary storage data, and combined with the priority of all status monitoring signals at the end of the previous monitoring cycle, the binary storage data corresponding to the status monitoring signals in each group are spliced ​​into abnormal variables matching the read and write order according to the priority order, including:

[0083] Determine the binary storage data of all state monitoring signals according to the state abnormality result corresponding to each state monitoring signal in the current monitoring cycle;

[0084] Determine the priority of each state monitoring signal in the corresponding group according to the grouped state monitoring signals and the priorities of all state monitoring signals at the end of the previous monitoring cycle;

[0085] Based on the binary storage data of all state monitoring signals and the priority of each state monitoring signal in the corresponding group, the binary storage data corresponding to the state monitoring signal in each group is spliced ​​in priority order to form an abnormal variable that matches the read and write order.

[0086] Among them, obtaining all status monitoring signals of relay protection in the current monitoring cycle may include:

[0087] Obtain the operating data of the primary equipment of relay protection, and collect the status monitoring signal of the corresponding protection category of relay protection in the current monitoring cycle in combination with the preset status judgment rules. Among them, the primary equipment includes circuit breakers, disconnectors and voltage transformers.

[0088] The preset status determination rules may include:

[0089] When the bus voltage collected by the voltage transformer is greater than the corresponding voltage threshold, or when the circuit breaker and the disconnector in any electrical compartment connected to the bus are in the closed state, it is determined that the bus is in operation; otherwise, it is determined that the bus is in the outage state;

[0090] When the circuit breakers and disconnectors in the electrical compartment connected to the line are in the closed state, and the line voltage collected by the voltage transformer or the bus voltage collected by the voltage transformer is greater than the corresponding voltage threshold, it is determined that the line is in operation; otherwise, it is determined that the line is in the outage state;

[0091] When the transformer terminal voltage collected by the voltage transformer is greater than the corresponding voltage threshold, or when the circuit breaker and the isolating switch connected on either side of the transformer are in the closed state, it is determined that the transformer is in operation; otherwise, it is determined that the transformer is in the outage state;

[0092] When collecting the state monitoring signal of the relay protection corresponding to the protection category in the current monitoring period, the present invention may include:

[0093] The abnormal variables corresponding to the lines, buses and / or transformers in the outage state are set to be composed of binary storage data with the state abnormality result being no abnormality;

[0094] Collect status monitoring signals corresponding to the lines, buses and / or transformers in operation.

[0095] The present invention monitors all aspects of the protection function for line protection, relay protection and transformer protection corresponding to the lines, busbars and transformers, including the device body, merging unit, intelligent terminal, export hard pressure plate, optical fiber loop, switch body control loop, to achieve comprehensive monitoring of the protection function status.

[0096] In addition, the present invention splices the binary storage data corresponding to the state monitoring signal in each group into abnormal variables matching the read and write order according to the priority order, which may include:

[0097] The binary storage data corresponding to the state monitoring signal with the highest priority in each group is used as the lowest byte corresponding to the start position of reading and writing; the binary storage data corresponding to all state monitoring signals in each group are arranged in order of priority; until the binary storage data corresponding to the state monitoring signal with the lowest priority is arranged to the highest byte corresponding to the end position of reading and writing, and the abnormal variables corresponding to each group of state monitoring signals are obtained. When the state abnormality result corresponding to each state monitoring signal in the current monitoring cycle is abnormal, the corresponding binary storage data is 1, otherwise it is 0.

[0098] According to the protection category of relay protection and the equipment category of each protection category, all status monitoring signals of relay protection in the current monitoring cycle are divided into multiple groups, including:

[0099] Dividing all state monitoring signals of the relay protection in the current monitoring cycle according to the protection category of the relay protection to form a plurality of first signal groups;

[0100] Dividing the status monitoring signals in each first signal group into two groups according to the equipment functions of each protection category to form a plurality of second signal groups;

[0101] Matching the status monitoring signals in each second signal group with the equipment model of each protection category, and providing a plurality of signal sets in the second signal group that match the equipment model;

[0102] The binary storage data corresponding to the state monitoring signal in the signal set are arranged adjacently in the abnormal variable formed by the second signal group.

[0103] When determining that the protection function status of the relay protection is abnormal, the first signal group can be used to determine whether the abnormal status occurs in the line protection, busbar protection and / or transformer protection, and the second signal group can be used to determine whether the abnormal status occurs in the line protection, busbar protection and / or transformer protection device body or the secondary equipment; in addition, when the abnormal status occurs in the secondary equipment, the signal set to which the binary storage data for judging the abnormal status belongs can be determined based on the position in the abnormal variable, and the corresponding equipment model can be determined based on the signal set, and finally the position of the abnormal status corresponding to the equipment model can be determined.

[0104] The present invention compares the abnormal variables of the current monitoring cycle with the abnormal variables at the end of the previous monitoring cycle in the order of reading and writing, and gives an alarm message when the comparison is different, which may include:

[0105] Determine whether there is a state monitoring signal of abnormal state according to the abnormal variables of the current monitoring cycle;

[0106] When determining that there is a state monitoring signal with an abnormal state, the abnormal variables formed by each group of state monitoring signals in the current monitoring cycle are compared with the abnormal variables of the corresponding group of state monitoring signals at the end of the previous monitoring cycle in the order of reading and writing, and when there are different binary storage data, the protection category and equipment category corresponding to the different abnormal variables are determined, and the functional state abnormality label is added and the corresponding warning message is generated. Among them, the comparison in the order of reading and writing means that the abnormal variables formed by each group of state monitoring signals in the current monitoring cycle are compared with the binary storage data in the same order in the abnormal variables of the corresponding group of state monitoring signals at the end of the previous monitoring cycle, for example, the lowest bit of the abnormal variable corresponding to the current monitoring cycle is compared with the lowest bit of the corresponding abnormal variable at the end of the previous monitoring cycle, until the highest bit of the abnormal variable corresponding to the current monitoring cycle is compared with the highest bit of the corresponding abnormal variable at the end of the previous monitoring cycle.

[0107] Among them, Figure 3 As shown, the present invention may include: updating the priorities of all status monitoring signals after the comparison is completed:

[0108] Obtaining the number of times each state monitoring signal comparison has different binary storage data and the total number of times each state monitoring signal is compared, and determining the probability that each state monitoring signal comparison has different binary storage data;

[0109] According to the determined probability of each state monitoring signal having different binary storage data when compared, the state monitoring signals in each group are arranged from large to small according to the probability of the binary storage data being different when compared to form a priority order from large to small.

[0110] In another application scenario, when the present invention updates the priorities of all status monitoring signals after the comparison is completed, it may include:

[0111] Obtain the number of times that the binary stored data is different in each state monitoring signal comparison and the total number of times each state monitoring signal is compared, and determine the probability that the binary stored data is different in each state monitoring signal comparison;

[0112] Based on the total number of state monitoring signals, the total number of times each state monitoring signal is compared, and the number of state monitoring signals with different binary storage data in each monitoring cycle, the overall abnormality probability of all monitoring cycles is given; wherein all monitoring cycles include the current monitoring cycle and multiple consecutive monitoring cycles before the current monitoring cycle;

[0113] According to the determined probability of different binary storage data in each state monitoring signal comparison and the overall abnormal probability of all monitoring cycles, the probability of different binary storage data in each state monitoring signal comparison in the next monitoring cycle is given;

[0114] According to the probability of different binary storage data appearing in the comparison of each state monitoring signal in the next monitoring cycle, the state monitoring signals in each group are arranged from large to small according to the probability of different binary storage data appearing in the comparison to form a priority order from large to small.

[0115] When the probability of different binary storage data is the same when comparing the status monitoring signals in the same group in the next monitoring cycle, the priorities of the status monitoring signals with the same probability in the group are arranged according to the priorities of the current monitoring cycle.

[0116] Among them, the probability of each state monitoring signal having a state abnormality in the next monitoring cycle satisfies the following relationship:

[0117]

[0118] In the formula, p i is the probability that the binary storage data is different in the comparison of the i-th state monitoring signal in the next monitoring cycle, n is the total number of comparisons for each state monitoring signal, that is, the number of monitoring cycles, m is the number of state monitoring signals, A i B is the number of times the binary storage data of the i-th state monitoring signal is different in the n monitoring cycles. j is the number of state monitoring signals with different binary storage data compared in the jth monitoring cycle, and α is the individual weight of the state monitoring signal, which can be determined according to the specific situation or prior knowledge, for example, α=0.8.

[0119] After updating the priorities of all status monitoring signals, the present invention may further include:

[0120] Based on the binary storage data of all status monitoring signals in the current monitoring cycle and the priority of each status monitoring signal after update in the corresponding group, the binary storage data corresponding to the status monitoring signal in each group is spliced ​​in the updated priority order to form a new abnormal variable. This can facilitate the rapid judgment of the protection function status in the next monitoring cycle.

[0121] Furthermore, the abnormal variable at the end of the previous monitoring cycle is an abnormal variable updated by the priority of all status monitoring signals before the end of the previous monitoring cycle. The abnormal variable can be formed at the end of the previous monitoring cycle, or it can be formed when the current monitoring cycle obtains the priority at the end of the previous monitoring cycle.

[0122] In actual application scenarios, such as Figure 4 As shown, the protection function status monitoring method of the present invention may include:

[0123] Step 1, dividing the relay protection into a device body and a plurality of secondary equipment units having a secondary signal transmission relationship with the device body;

[0124] Specifically, in substation engineering design, relay protection includes but is not limited to: busbar protection, line protection and transformer protection. However, the functional status monitoring requirements of these three types of protection are the strongest, and the evaluation of the overall operating status of relay protection is the most critical.

[0125] The line protection is divided into the line protection device body, merging unit, intelligent terminal, export hard pressure plate and optical fiber loop;

[0126] The busbar protection is divided into the busbar protection device body, merging unit, intelligent terminal, export hard pressure plate and optical fiber loop;

[0127] The transformer protection is divided into the line protection device body, merging unit, intelligent terminal, export hard pressure plate and optical fiber loop.

[0128] Step 2, in the current monitoring cycle, respectively collects the status monitoring signals of the device body and the secondary equipment unit, including:

[0129] Determine the operating status of the line, busbar and transformer within the current monitoring period;

[0130] The status monitoring signals of the device body and the secondary equipment units corresponding to the lines, busbars and transformers determined to be in the operating state are collected respectively.

[0131] In the embodiment, an operation status judgment cycle T is set, T≥1s, and the operation status of the primary equipment is determined according to the operation data of the primary equipment within the time period NT, N is a positive integer, preferably, N is not less than 10; within the time period NT, the operation data of the primary equipment, the device body and each secondary equipment unit are collected. Among them, the primary equipment includes but is not limited to: circuit breakers, disconnectors, current transformers and voltage transformers; the operation data of the primary equipment includes: the opening and closing state of the circuit breaker, the opening and closing state of the disconnector, the current measurement value of the current transformer, and the voltage measurement value of the voltage transformer. The operation status of the bus, line and transformer are determined respectively according to the operation data of the primary equipment.

[0132] Specifically, the bus voltage is collected by the voltage transformer installed on the bus. When the bus voltage is greater than the set voltage threshold, the bus is determined to be in operation; or when the circuit breaker in any electrical interval connected to the bus is in the closed state and the disconnector is also in the closed state, the bus is determined to be in operation.

[0133] When it is determined that the busbar is in operation, if the circuit breaker in any electrical compartment connected to the busbar is in the closed state and the disconnector is also in the closed state, then the electrical compartment is determined to be in operation.

[0134] Specifically, the line voltage is collected by a voltage transformer installed on the line, and the voltage of the busbar to which the line is connected is collected by a voltage transformer installed on the busbar. When the circuit breaker in the electrical interval connected to the line is in a closed state, the disconnector is also in a closed state, and when the line voltage or the busbar voltage is greater than a set voltage threshold, it is determined that the line is in operation.

[0135] Specifically, the terminal voltage of the transformer is collected through the voltage transformer installed on either side of the transformer. When the terminal voltage is greater than the set voltage threshold, the transformer is determined to be in operation; or when the circuit breaker connected to either side of the transformer is in the closed state and the isolating switch is also in the closed state, the transformer is determined to be in operation.

[0136] Furthermore, the voltage threshold is set to 0.4U N , U N is the rated voltage of the system.

[0137] The primary equipment operating status identification method provided by the present invention covers three types of primary equipment: lines, busbars and transformers. At the same time, it combines voltage analog quantity, circuit breaker opening and closing positions, and disconnector opening and closing positions to enhance the reliability of primary equipment operating status identification criteria.

[0138] Specifically, the collected status monitoring signals of the line protection device body include, in order of priority from high to low: operation signal, maintenance signal, dual-channel control word signal, optical fiber channel one soft pressure plate signal, optical fiber channel two soft pressure plate signal, distance protection soft pressure plate signal, longitudinal differential protection control word signal, distance protection control word signal, SV receiving soft pressure plate signal, tripping soft pressure plate signal, reclosing soft pressure plate signal and SV receiving broken link signal;

[0139] For line protection, the status monitoring signals of the merging units collected include, in order of priority from high to low: device locking signal, maintenance signal; the status monitoring signals of the intelligent terminals collected include, in order of priority from high to low: device locking signal, maintenance signal and control loop disconnection signal; the status monitoring signals of the optical fiber loops collected include, in order of priority from high to low: optical fiber signals sent from the merging unit to the line protection, optical fiber signals received by the intelligent terminal for line protection GOOSE tripping; the status monitoring signals of the export hard pressure plate collected include: export hard pressure plate position signal.

[0140] The status monitoring signals of the busbar protection device body collected include, in descending order of priority: operation signal, maintenance signal, differential protection soft pressure plate signal, differential protection control word signal, SV receiving soft pressure plate signal of all intervals, tripping soft pressure plate signal of all intervals and SV receiving disconnection signal;

[0141] For busbar protection, the collected status monitoring signals of the merging unit include, in order of priority from high to low: device locking signal, maintenance signal; the collected status monitoring signals of the intelligent terminal include, in order of priority from high to low: device locking signal, maintenance signal and control loop disconnection signal; the collected status monitoring signals of the optical fiber loop include, in order of priority from high to low: optical fiber signal sent from the merging unit to the busbar protection, optical fiber signal received by the intelligent terminal for busbar protection GOOSE tripping; the collected status monitoring signals of the export hard pressure plate include: export hard pressure plate position signal.

[0142] The status monitoring signals of the transformer protection device body collected include, in descending order of priority: operation signal, maintenance signal, main protection soft pressure plate signal, differential quick-break protection control word signal, longitudinal differential protection control word signal, SV receiving soft pressure plate signals of all intervals, tripping soft pressure plate signals of all intervals, SV receiving broken link signals and main protection tripping matrix signals;

[0143] For transformer protection, the status monitoring signals of the merging unit collected include, in order of priority from high to low: device locking signal, maintenance signal; the status monitoring signals of the intelligent terminal collected include, in order of priority from high to low: device locking signal, maintenance signal and control loop disconnection signal; the status monitoring signals of the optical fiber loop collected include, in order of priority from high to low: optical fiber signal sent from the merging unit to the transformer protection, optical fiber signal received by the intelligent terminal for transformer protection GOOSE tripping; the status monitoring signals of the export hard pressure plate collected include: export hard pressure plate position signal.

[0144] Step 3, respectively set the abnormal variables of the device body and each secondary equipment unit, and the lowest byte of the abnormal variable corresponds to the status monitoring signal with the highest priority, and the highest byte of the abnormal variable corresponds to the status monitoring signal with the lowest priority.

[0145] Specifically, the abnormal variables of the busbar protection device body BusError_prot Set to n B bytes, n B is the number of status monitoring signals of the line protection device body, n B is a positive integer; abnormal variable of the line protection device itself LineError_prot Set ton L bytes, n L is the number of status monitoring signals of the line protection device body, n L is a positive integer; abnormal variable of the transformer protection device TransError_prot Set to n T bytes, n T is the number of status monitoring signals of the line protection device body, n T Is a positive integer.

[0146] Specifically, the abnormal variables of the merged unit Error_curcuit 1Set to n LL1 bytes, n LL1 is the number of status monitoring signals for the merging unit, n LL1 Is a positive integer; abnormal variable of the intelligent terminal Error_curcuit 2Set to n LL2 bytes, n LL2 is the number of status monitoring signals of the intelligent terminal, n LL2 is a positive integer; abnormal variable of the optical fiber loop Error_ curcuit 3Set to n LL3 bytes, n LL3 is the number of status monitoring signals for the optical fiber loop, n LL3 is a positive integer; abnormal variable of the export hard plate Error_curcuit 4Set to n LL4 bytes, n LL4 is the number of status monitoring signals of the export hard plate, n LL4 Is a positive integer.

[0147] Step 4, based on the abnormality judgment criterion, when it is determined that the line protection device body has an abnormality according to the state monitoring signal, the abnormal variable corresponding to the line protection device body is assigned a value of 1 (ie, binary storage data is generated), otherwise it is assigned a value of 0.

[0148] Specifically, for the lines, busbars and transformers that are judged to be out of service, all bytes of the abnormal variables and comprehensive abnormal variables of the corresponding device bodies are assigned a value of 0.

[0149] In the embodiment, the line protection includes two sets of device bodies, namely, set A and set B. Taking set A of the line protection device body as an example, based on the abnormality judgment criteria shown in Table 1, the state monitoring signals of the collected line protection device bodies are judged abnormally and the corresponding bytes of the abnormal variables are assigned values ​​in descending order according to the priority, as shown in Table 1.

[0150] Table 1 Abnormal conditions and values ​​of the line protection device

[0151]

[0152] In Table 1, LineError_protA is the abnormal variable of the A-set line protection device body, LineError_protA Use hexadecimal, set 10 bytes, the lowest byte bit 0 corresponds to the judgment result of the running signal, the highest byte bit 9 corresponds to the judgment result of SV receiving the link-break signal.

[0153] For line protection set A, based on the abnormal judgment criteria shown in Table 2, the collected state monitoring signals of the merging unit are judged abnormally and the corresponding bytes of the abnormal variables are assigned values ​​in order from high to low priority. See Table 2 for details:

[0154] Table 2 Abnormal conditions and assignments of merged units

[0155]

[0156] In Table 2, LineError_curcuit 1 A is the abnormal variable of the merging unit of line protection set A, LineError_ curcuit 1 A Set 2 bytes, the lowest byte bit 0 corresponds to the judgment result of the device locking signal, the highest byte bit 1 corresponds to the judgment result of the maintenance signal.

[0157] For line protection set A, based on the abnormal judgment criteria shown in Table 3, the collected state monitoring signals of the intelligent terminal are judged for abnormalities in descending order according to the priority, and the corresponding bytes of the abnormal variables are assigned values, as shown in Table 3:

[0158] Table 3 Abnormal conditions and values ​​of smart terminals

[0159]

[0160] In Table 3, LineError_curcuit 2 A It is the abnormal variable of the intelligent terminal of line protection set A. LineError_ curcuit2 A Set 3 bytes, the lowest byte bit 0 corresponds to the judgment result of the device locking signal, the highest byte bit 2 corresponds to the judgment result of the control circuit disconnection signal.

[0161] For line protection set A, based on the abnormal judgment criteria shown in Table 4, the acquired optical fiber loop status monitoring signals are judged abnormally and the corresponding bytes of the abnormal variables are assigned values ​​in order from high to low priority, as shown in Table 4:

[0162] Table 4 Abnormal conditions and values ​​of optical fiber loops

[0163]

[0164] In Table 4, LineError_curcuit 3 A is the abnormal variable of the optical fiber loop protected by line A. LineError_ curcuit 3 A Set 2 bytes, the lowest byte bit 0 corresponds to the judgment result of the optical fiber signal sent from the merging unit to the line protection, the highest byte bit 1 corresponds to the judgment result of the intelligent terminal receiving the line protection GOOSE tripping optical fiber signal.

[0165] For line protection set A, when the exit hard pressure plate position signal is 0, it is considered abnormal, and the abnormal record is: "Line name_A set line exit hard pressure plate abnormality", LineError_curcuit 4 A Bytes bit Set 0 to 1.

[0166] Tables 5 to 8 show the abnormal conditions and values ​​of the main body of the I busbar protection device and each secondary equipment unit:

[0167] Table 5 Abnormal conditions and values ​​of the busbar protection device

[0168]

[0169] In Table 5, BusError_protA It is the abnormal variable of the I busbar protection device.

[0170] Table 6 Abnormal conditions and assignments of merged units

[0171]

[0172] In Table 6, BusError_curcuit 1 A It is the abnormal variable of the merging unit corresponding to the I busbar protection.

[0173] Table 7 Abnormal conditions and values ​​of smart terminals

[0174]

[0175] In Table 7, BusError_curcuit 2 A It is the abnormal variable of the intelligent terminal corresponding to the I bus protection.

[0176] Table 8 Abnormal conditions and values ​​of optical fiber loops

[0177]

[0178] In Table 8, BusError_curcuit 3 A It is the abnormal variable of the optical fiber loop corresponding to the I busbar protection.

[0179] For I busbar protection, when the outlet hard pressure plate position signal is 0, it is judged as abnormal, and the abnormal record is: "XX interval_busbar outlet hard pressure plate abnormality", BusError_curcuit 4 A Bytes bit Set 0 to 1.

[0180] Tables 9 to 12 show the abnormal conditions and values ​​of the device body and each secondary equipment unit of the #1 transformer protection:

[0181] Table 9 Abnormal conditions and values ​​of transformer protection device

[0182]

[0183] In Table 9, TransError_protA It is the abnormal variable of the #1 transformer protection device body.

[0184] Table 10 Abnormal conditions and assignments of merged units

[0185]

[0186] In Table 10, TransError_curcuit 1 A Protect the abnormal variables of the merging unit corresponding to transformer #1.

[0187] Table 11 Abnormal conditions and values ​​of smart terminals

[0188]

[0189] In Table 11, TransError_curcuit 2 A Protect the abnormal variables of the intelligent terminal corresponding to transformer #1.

[0190] Table 12 Abnormal conditions and values ​​of optical fiber loops

[0191]

[0192] In Table 12, TransError_curcuit 3 A Abnormal variables of the optical fiber loop corresponding to the #1 transformer protection.

[0193] For the #1 transformer protection, when the outlet hard pressure plate position signal is 0, it is judged as abnormal, and the abnormal record is: "Main transformer interval_export hard pressure plate abnormality", TransError_curcuit 4 A Bytes Set to 1.

[0194] Specifically, in the case of configuring two sets of protection, it is necessary to monitor the functional status of each set of protection at the same time.

[0195] Step 5, in the order of the abnormal variable of the secondary equipment unit with the highest priority being at the lowest bit and the abnormal variable of the secondary equipment unit with the lowest priority being at the highest bit, the abnormal variables of each secondary equipment unit are spliced ​​into a comprehensive abnormal variable.

[0196] Specifically, the comprehensive abnormal variable corresponding to the signal loop (including each secondary device) is set as n LL bytes, n LL It is the sum of the number of status monitoring signals of the merging unit, intelligent terminal, optical fiber loop and export hard pressure plate. n LL is a positive integer; starting from the lowest bit of the comprehensive abnormal variable corresponding to the signal loop, the first to the n LL1 Bytes correspond to the abnormal variables of the merge unit, n LL1 +1 to n LL1 + n LL2 Bytes correspond to abnormal variables of the intelligent terminal, n LL2 +1 to n LL2 + n LL3 The bytes correspond to the abnormal variables of the optical fiber circuit. n LL3 +1 to n LL3 + n LL4 Bytes corresponding to the exception variable of the exit hard pressure plate.

[0197] Step 6, if the abnormal variable of the device body in the current monitoring cycle is not 0, the abnormal variable of the device body in the current monitoring cycle is compared byte by byte with the abnormal variable of the device body in the previous monitoring cycle starting from the lowest byte. When there are different bytes, it is determined that the functional state of the device body in the current monitoring cycle is abnormal, and an alarm message of the device body is generated;

[0198] Alternatively, if the comprehensive abnormal variable in the current monitoring cycle is not 0, the comprehensive abnormal variable in the current monitoring cycle is compared with the comprehensive abnormal variable in the previous monitoring cycle byte by byte starting from the lowest byte. When there are different bytes, it is determined that the functional status of the signal circuit in the current monitoring cycle is abnormal, and an alarm message for the signal circuit is generated.

[0199] Specifically, if the abnormal variable of the device body in the current monitoring cycle is not 0, the abnormal variable of the device body in the current monitoring cycle is compared byte by byte with the abnormal variable of the device body in the previous monitoring cycle starting from the lowest byte. When there are different bytes, it is determined that the functional state of the device body in the current monitoring cycle is abnormal, and an alarm message of the device body is generated, including:

[0200] 1) Obtain the abnormal variables of the device body corresponding to each set of protection in the current monitoring period;

[0201] In the embodiment, in the current monitoring cycle, taking line protection as an example, the abnormal variables of the device body corresponding to the A set and the B set of line protection are obtained. LineError_protA and LineError_protB .

[0202] 2) If the abnormal variable of the device body corresponding to any set of protection in the current monitoring period is not 0, it is preliminarily determined that the protection function of the device body is abnormal;

[0203] In the embodiment, LineError_protA , LineError_protB If any variable in is not 0, it is preliminarily determined that the protection function of the device body is abnormal, and it is possible to locate whether the protection function abnormality comes from the device body or from each secondary equipment unit. When applied to online monitoring, it can effectively narrow the monitoring range of the protection function abnormality and assist the operation and maintenance personnel to find the location of the equipment with the protection function abnormality as early as possible.

[0204] It is worth noting that for the lines, buses and transformers that are judged to be out of service, the corresponding abnormal variables and comprehensive abnormal variables of the device body are all assigned 0. The present invention monitors the protection function status of the relay protection in combination with the operating status of the primary equipment, and shields the invalid protection function status monitoring alarm.

[0205] 3) When it is preliminarily determined that the protection function of the device body is abnormal, the abnormal variables of the device body corresponding to each set of protection in the previous monitoring cycle are collected;

[0206] In the embodiment, the device body abnormal variables corresponding to the line protection sets A and B in the previous monitoring cycle are LineError_protA' and LineError_protB' .

[0207] 4) Compare the abnormal variables of the device body in the current monitoring cycle with the abnormal variables of the device body in the previous monitoring cycle byte by byte starting from the lowest byte; when different bytes appear for the first time, it is determined that the protection function of the device body in the current monitoring cycle is abnormal; when all bytes are compared, the status monitoring signal corresponding to the different bytes is output.

[0208] The abnormal variable of the device body proposed by the present invention includes multiple bytes, and the comparison starts from the lowest byte, that is, the status monitoring signal with high priority is compared first. When different bytes appear for the first time, it is determined that the protection function of the device body in the current monitoring cycle is abnormal, which can improve the sensitivity of the protection function status monitoring of the relay protection and discover the abnormal function as early as possible. Taking the device body determined to be normal in the previous monitoring cycle as a reference, by comparing the values ​​of the corresponding bytes, the functional status of the device body in the current monitoring cycle can be monitored, thereby improving the accuracy of the protection function status monitoring.

[0209] Moreover, when it has been previously determined that there is an abnormality in the protection function of the device body, after all bytes have been compared, the status monitoring signals corresponding to the different bytes are output. The abnormal status monitoring signals can be located according to the positions of the different bytes, and the cause of the failure of the protection device body can be further determined, and timely alarms can be issued to guide the operation and maintenance personnel to take effective measures.

[0210] 5) When it is determined that the functional status of the device body is abnormal during the current monitoring cycle, an alarm message of the device body is generated according to the status monitoring signal corresponding to the different bytes output.

[0211] Taking line protection as an example, the format of the alarm file (including alarm message) is shown in Table 13:

[0212] Table 13 Format of line protection alarm file

[0213]

[0214] It can be seen from Table 13 that according to the secondary equipment information segment, analysis function module information and analysis conclusion information in the alarm message, it can be determined that the location and cause of the abnormal protection function is that in the A-set line protection of a certain line, the tripping soft pressure plate of the device body fails and the control circuit of the intelligent terminal is disconnected. Not only the location of the abnormal protection function is given, but also the cause of the abnormality is given.

[0215] Specifically, if the comprehensive abnormal variable in the current monitoring cycle is not 0, the comprehensive abnormal variable in the current monitoring cycle is compared byte by byte with the comprehensive abnormal variable in the previous monitoring cycle starting from the lowest byte. If there are different bytes, it is determined that a signal circuit failure occurs in the current monitoring cycle, and an alarm message of the signal circuit is generated, including:

[0216] 1) Obtain the comprehensive abnormal variables corresponding to each set of protection in the current monitoring period;

[0217] In the embodiment, in the current monitoring cycle, taking line protection as an example, the comprehensive abnormal variables corresponding to the line protection sets A and B are obtained. LineError_curcuitA and LineError_curcuitB .

[0218] 2) If the comprehensive abnormal variable corresponding to any set of protection in the current monitoring period is not 0, it is preliminarily determined that the protection function of the secondary equipment unit is abnormal;

[0219] In the embodiment, LineError_curcuitA and LineError_curcuitB If any variable in is not 0, it is preliminarily determined that the protection function of the secondary equipment unit is abnormal, and it is possible to locate whether the protection function abnormality comes from the device body or from each secondary equipment unit. When applied to online monitoring, it can effectively narrow the monitoring range of the protection function abnormality and assist operation and maintenance personnel to find the location of the equipment with the protection function abnormality as early as possible.

[0220] It is worth noting that for lines, busbars and transformers that are judged to be out of service, the corresponding device body's abnormal variables and comprehensive abnormal variables are all assigned values ​​of 0.

[0221] 3) When the protection function of the secondary equipment unit is initially determined to be abnormal, the comprehensive abnormal variables corresponding to each set of protection in the previous monitoring cycle are collected;

[0222] In the embodiment, the comprehensive abnormal variables corresponding to the line protection sets A and B in the previous monitoring cycle are LineError_ curcuitA' and LineError_curcuitB' .

[0223] 4) Compare the comprehensive abnormal variables in the current monitoring cycle with the comprehensive abnormal variables in the previous monitoring cycle byte by byte starting from the lowest byte; when different bytes appear for the first time, it is determined that the protection function of the secondary equipment unit in the current monitoring cycle is abnormal; when all bytes are compared, the secondary equipment unit corresponding to the different bytes and its status monitoring signal are output.

[0224] The comprehensive abnormal variable proposed by the present invention includes multiple bytes, and the comparison starts from the lowest byte, that is, the state monitoring signal with high priority is compared first. When different bytes appear for the first time, it is determined that the protection function of the secondary equipment unit in the current monitoring cycle is abnormal, which can improve the sensitivity of the protection function state monitoring of the relay protection and discover the abnormal function as early as possible. Taking the secondary equipment unit determined to be normal in the previous monitoring cycle as a reference, by comparing the values ​​of the corresponding bytes, the functional state of the secondary equipment unit in the current monitoring cycle can be monitored, which improves the accuracy of the protection function state monitoring.

[0225] Moreover, when it has been previously determined that a protection function abnormality exists in a secondary equipment unit, after all bytes have been compared, the secondary equipment unit corresponding to the different bytes and its status monitoring signal are output. The abnormal secondary equipment unit and its status monitoring signal can be located according to the position of the different bytes, and the cause of the failure of the protection device body can be further determined, and an alarm can be issued in time to guide the operation and maintenance personnel to take effective measures.

[0226] 5) When it is determined that the functional status of the secondary equipment unit is abnormal during the current monitoring cycle, an alarm message of the secondary equipment unit is generated according to the secondary equipment unit and its status monitoring signal corresponding to the different bytes output.

[0227] Step 7, based on the alarm message, count the occurrence probabilities of the status monitoring signals of the device body or the status monitoring signals of the secondary equipment unit corresponding to different bytes; when the occurrence probability of the status monitoring signal with a low priority is greater than the occurrence probability of the status monitoring signal with a high priority, swap the priorities of the two status monitoring signals and return to step 3.

[0228] In the embodiment, the probability of occurrence of the status monitoring signal of the device body or the status monitoring signal of the secondary equipment unit corresponding to different bytes, that is, the probability of abnormal occurrence of the protection function of the device body or the secondary equipment unit, for example, if the probability of abnormal occurrence of the tripping soft pressure plate signal in the line protection device body is greater than the probability of abnormal occurrence of the reclosing soft pressure plate signal, the original priority of the tripping soft pressure plate signal is higher than the reclosing soft pressure plate signal, but it is necessary to swap the priorities of the two status monitoring signals based on the comparison result of the abnormal occurrence probability, that is, adjust the priority of the reclosing soft pressure plate signal to be higher than the tripping soft pressure plate signal.

[0229] The present invention proposes to adjust the priority of the status monitoring signal in real time based on the comparison result of the probability of abnormality of the status monitoring signal, so as to adjust the position of each byte in the abnormal variable in real time. When performing byte comparison, the status monitoring signals where abnormalities often occur are compared in advance, which can further improve the sensitivity of the protection function status monitoring of the relay protection and discover abnormal functions as early as possible.

[0230] like Figure 5 As shown, the present invention provides a protection function status monitoring system for relay protection, adopting the protection function status monitoring method of relay protection, and the protection function status monitoring system comprises:

[0231] A signal acquisition module, which is used to obtain all status monitoring signals of relay protection in the current monitoring cycle, and the priorities of all status monitoring signals at the end of the previous monitoring cycle;

[0232] A variable generation module, which is used to splice all the state monitoring signals of the relay protection in the current monitoring cycle into a plurality of abnormal variables matching the reading and writing order according to the priority order of all the state monitoring signals at the end of the previous monitoring cycle;

[0233] The alarm update module is used to compare the abnormal variables of the current monitoring cycle with the abnormal variables at the end of the previous monitoring cycle in the reading and writing order, give an alarm message when the comparison is different, and update the priority of all status monitoring signals after the comparison is completed.

[0234] Although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments by those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for monitoring the protection function status of relay protection, characterized in that: include: Obtain all status monitoring signals of relay protection in the current monitoring cycle, and the priorities of all status monitoring signals at the end of the previous monitoring cycle; Based on the priorities of all status monitoring signals at the end of the previous monitoring cycle, all status monitoring signals of the relay protection in the current monitoring cycle are spliced ​​into multiple abnormal variables matching the reading and writing order according to the priority order; Compare the abnormal variables of the current monitoring cycle with the abnormal variables at the end of the previous monitoring cycle in the order of reading and writing, give an alarm message if the comparison is different, and update the priority of all status monitoring signals after the comparison is completed; Based on the priorities of all status monitoring signals at the end of the previous monitoring cycle, all status monitoring signals of relay protection in the current monitoring cycle are spliced ​​into multiple abnormal variables matching the read and write order in order of priority, including: According to the protection category of the relay protection and the equipment category of each protection category, all the state monitoring signals of the relay protection in the current monitoring cycle are divided into multiple groups; Each group of status monitoring signals is converted into binary storage data, and combined with the priority of all status monitoring signals at the end of the previous monitoring cycle, the binary storage data corresponding to the status monitoring signals in each group are spliced ​​into abnormal variables matching the read and write order according to the priority order, including: According to the state abnormality result corresponding to each state monitoring signal in the current monitoring cycle, the binary storage data of all state monitoring signals are determined; according to the grouped state monitoring signals and the priority of all state monitoring signals at the end of the previous monitoring cycle, the priority size of each state monitoring signal in the corresponding group is determined; based on the binary storage data of all state monitoring signals and the priority size of each state monitoring signal in the corresponding group, the binary storage data corresponding to the state monitoring signal in each group is spliced ​​in priority order to form an abnormal variable matching the read-write order, including: taking the binary storage data corresponding to the state monitoring signal with the highest priority in each group as the lowest byte corresponding to the read-write start position; arranging the binary storage data corresponding to all state monitoring signals in each group in sequence according to the priority order; until the binary storage data corresponding to the state monitoring signal with the lowest priority is arranged to the highest byte corresponding to the read-write end position, to obtain the abnormal variable corresponding to each group of state monitoring signals; wherein, when the state abnormality result corresponding to the state monitoring signal in the current monitoring cycle is abnormal, the corresponding binary storage data is 1, otherwise it is 0.

2. The protection function status monitoring method according to claim 1, characterized in that: The protection categories of relay protection include line protection, busbar protection and transformer protection. Line protection, busbar protection and transformer protection all include the device body and secondary equipment.

3. The protection function status monitoring method according to claim 1, characterized in that: According to the protection category of relay protection and the equipment category of each protection category, all status monitoring signals of relay protection in the current monitoring cycle are divided into multiple groups, including: Dividing all state monitoring signals of the relay protection in the current monitoring cycle according to the protection category of the relay protection to form a plurality of first signal groups; Dividing the status monitoring signals in each first signal group into two groups according to the equipment functions of each protection category to form a plurality of second signal groups; Matching the status monitoring signals in each second signal group with the equipment model of each protection category, and providing a plurality of signal sets in the second signal group that match the equipment model; The binary storage data corresponding to the state monitoring signal in the signal set are arranged adjacently in the abnormal variable formed by the second signal group.

4. The protection function status monitoring method according to any one of claims 1 to 3, characterized in that: The abnormal variables of the current monitoring cycle are compared with the abnormal variables at the end of the previous monitoring cycle in the order of reading and writing. If the comparison is different, an alarm message is given, including: Determine whether there is a state monitoring signal of abnormal state according to the abnormal variables of the current monitoring cycle; When determining that there is a status monitoring signal with an abnormal state, the abnormal variables formed by each group of status monitoring signals in the current monitoring cycle are compared with the abnormal variables of the corresponding group of status monitoring signals at the end of the previous monitoring cycle in a read-write order, and when they have different binary storage data, the protection category and equipment category corresponding to the different abnormal variables are determined, and a functional status abnormal label is added and a corresponding warning message is generated.

5. The protection function status monitoring method according to claim 4, characterized in that: After the comparison is completed, the priorities of all status monitoring signals are updated, including: Obtaining the number of times each state monitoring signal comparison has different binary storage data and the total number of times each state monitoring signal is compared, and determining the probability that each state monitoring signal comparison has different binary storage data; According to the determined probability of each state monitoring signal having different binary storage data when compared, the state monitoring signals in each group are arranged from large to small according to the probability of the binary storage data being different when compared to form a priority order from large to small.

6. A protection function status monitoring system for relay protection, characterized in that: The protection function status monitoring method of the relay protection as claimed in any one of claims 1 to 5 is adopted, and the protection function status monitoring system comprises: A signal acquisition module, which is used to obtain all status monitoring signals of relay protection in the current monitoring cycle, and the priorities of all status monitoring signals at the end of the previous monitoring cycle; A variable generation module, which is used to splice all the state monitoring signals of the relay protection in the current monitoring cycle into a plurality of abnormal variables matching the reading and writing order according to the priority order of all the state monitoring signals at the end of the previous monitoring cycle; The alarm update module is used to compare the abnormal variables of the current monitoring cycle with the abnormal variables at the end of the previous monitoring cycle in the reading and writing order, give an alarm message when the comparison is different, and update the priority of all status monitoring signals after the comparison is completed.

7. A computer storage medium, characterized in that: The computer storage medium stores computer instructions, and when the computer instructions are called, they are used to execute the protection function status monitoring method of relay protection as described in any one of claims 1-5.

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