Operation maintenance method and system of relay protection system

Abstract

The invention relates to the technical field of relay protection, and particularly discloses an operation maintenance method and system for a relay protection system, and the method comprises the steps: obtaining a state parameter of a relay protection device, and carrying out the partitioning of the relay protection device according to the state parameter of the relay protection device; obtaining operation parameters of the relay protection device in each partition, and determining the stability level of the relay protection device according to the operation parameters of the relay protection device in each partition; and determining the early warning type of the relay protection device according to the stability level, and determining the maintenance time of the relay protection device according to the early warning type. According to the invention, the early warning type can be accurately judged according to the state of the relay protection device and early warning can be timely given out, so that the operation maintenance effect of the relay protection system is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of relay protection, and more specifically, to an operation and maintenance method and system of a relay protection system. Background Art

[0002] The power system is composed of various electrical components. Due to the natural environment, manufacturing quality, operation and maintenance level and other reasons, it is impossible for each electrical component to maintain normal status during operation. Therefore, special technologies are needed to establish a safety guarantee system for the power system. One of the most important special technologies is relay protection technology. Relay protection is an important measure to detect faults or abnormal conditions in the power system, thereby issuing an alarm signal, or directly isolating and removing the faulty part. The relay protection device must have the function of correctly distinguishing whether the protected component is in normal operation or has a fault, and whether it is a fault inside the protection zone or outside the protection zone.

[0003] The relay protection operation system of the power plant involved in the grid is used to detect the operating status of each component of the power system in real time. Once a fault or abnormality occurs in the system, the relay protection device will act quickly to isolate the fault or issue an alarm to ensure the safety and stability of the power system. The performance of the relay protection operation system of the power plant involved in the grid has a very large impact on the safe operation of the power grid. The existing technology for the operation and maintenance of the relay protection system is limited to the personal experience of the operation and maintenance personnel, and it is impossible to accurately judge the specific operating status of the relay protection device, resulting in low efficiency in the operation and maintenance of the relay protection system. Summary of the invention

[0004] The present invention provides an operation and maintenance method and system of a relay protection system, which is used to solve the problem of low operation and maintenance efficiency of the relay protection system in the prior art, and includes:

[0005] Acquire state parameters of the relay protection device, and partition the relay protection device according to the state parameters of the relay protection device;

[0006] Obtaining the operating parameters of the relay protection devices in each zone, and determining the stability level of the relay protection devices according to the operating parameters of the relay protection devices in each zone;

[0007] The warning type of the relay protection device is determined according to the stability level, and the maintenance time of the relay protection device is determined according to the warning type.

[0008] Furthermore, the obtaining of the state parameters of the relay protection device includes:

[0009] Obtain the working temperature of the relay protection device, and draw a working temperature change curve according to the working temperature of the relay protection device;

[0010] Performing curve fitting on the working temperature variation curve to obtain a working temperature fitting curve, and determining a predicted time when the working temperature reaches a first preset threshold value according to the working temperature fitting curve;

[0011] The predicted time for the operating temperature to reach the first preset threshold is standardized to obtain the state parameters of the relay protection device.

[0012] Furthermore, partitioning the relay protection device according to the state parameters of the relay protection device includes:

[0013] A state parameter data set is established according to the state parameters of the relay protection device, and k initial clustering centers of the state parameter data set are randomly selected;

[0014] Calculate the Euclidean distance from the state parameter in the state parameter data set to the initial cluster center, and divide the state parameter into corresponding partitions according to the Euclidean distance from the state parameter in the state parameter data set to the initial cluster center;

[0015] Calculate the average value of the state parameters in each partition, and recalculate the cluster center based on the average value of the state parameters in each partition;

[0016] Repeat the above steps until the cluster center no longer changes or the number of iterations reaches the preset iteration threshold, and obtain k final cluster centers. According to the clustering results, determine the partition of the relay protection device corresponding to each state parameter.

[0017] Furthermore, determining the stability level of the relay protection device according to the operating parameters of the relay protection device in each zone includes:

[0018] Standardize the operating parameters of the relay protection devices in each zone to obtain standardized operating parameters;

[0019] Establish an operating parameter radar chart based on the standardized operating parameters, and calculate the area of ​​the operating parameter radar chart;

[0020] Obtain the cluster center of the partition where the relay protection device is located, and set the partition weight according to the cluster center of the partition where the relay protection device is located;

[0021] The area of ​​the operating parameter radar chart is corrected according to the partition weight, and the stability level of the relay protection device is determined according to the area of ​​the corrected operating parameter radar chart.

[0022] Furthermore, determining the stability level of the relay protection device according to the area of ​​the corrected operating parameter radar chart includes:

[0023] Obtain the area of ​​the preset standard radar chart, calculate the difference between the area of ​​the corrected operating parameter radar chart and the area of ​​the preset standard radar chart, and obtain the radar chart area difference;

[0024] Determine whether the radar chart area difference is greater than a second preset threshold value, and if the radar chart area difference is greater than the second preset threshold value, set the preset first stability level as the stability level of the relay protection device;

[0025] If the radar chart area difference is less than or equal to the second preset threshold, determining whether the radar chart area difference is greater than a third preset threshold;

[0026] If the radar chart area difference is greater than a third preset threshold, the preset second stability level is set as the stability level of the relay protection device;

[0027] If the radar chart area difference is less than or equal to the third preset threshold, the preset third stability level is set as the stability level of the relay protection device.

[0028] Further, the step of determining the warning type of the relay protection device according to the stability level includes:

[0029] Acquire historical fault data of the relay protection device, wherein the historical fault data of the relay protection device includes historical operating parameters and corresponding warning types;

[0030] The stability level of the relay protection device is obtained, and the strong association rules of the historical fault data are mined according to the stability level of the relay protection device based on the apriori algorithm. The warning type of the relay protection device is determined according to the strong association rules.

[0031] Furthermore, the method of mining strong association rules of historical fault data according to the stability level of the relay protection device based on the apriori algorithm includes:

[0032] Discretize the historical fault data of the relay protection device to obtain discretized historical fault data;

[0033] Obtain a preset minimum support threshold, and mine historical operating parameters whose support is greater than or equal to the preset minimum support threshold based on the warning type of historical fault data based on the apriori algorithm;

[0034] The minimum confidence threshold is determined according to the stability level of the relay protection device, and the historical operating parameters with confidence greater than or equal to the minimum confidence threshold are mined from the historical operating parameters with support greater than or equal to the preset minimum support threshold according to the warning type of the historical fault data to obtain strong association rules.

[0035] Furthermore, the method of determining the maintenance time of the relay protection device according to the warning type includes:

[0036] Determine the fault operation parameters corresponding to the warning type according to the warning type of the relay protection device, and draw the fault operation curve according to the fault operation parameters;

[0037] Obtaining a preset standard fault operation curve, calculating a correlation coefficient between the preset standard fault operation curve and the fault operation curve, and determining a decreasing parameter according to the correlation coefficient between the preset standard fault operation curve and the fault operation curve;

[0038] Performing curve fitting on the fault operation curve to obtain the fault operation fitting curve, and correcting the coefficient of the fault operation fitting curve according to the decreasing parameter;

[0039] The time required for the fault operation parameter to reach the fourth preset threshold is predicted according to the coefficient-corrected fault operation fitting curve, and the maintenance time of the relay protection device is determined according to the time required for the fault operation parameter to reach the fourth preset threshold.

[0040] Furthermore, the step of determining the decrement parameter according to the correlation coefficient between the preset standard fault operation curve and the fault operation curve includes:

[0041] The decreasing parameter is determined according to the decreasing parameter calculation formula, and the decreasing parameter calculation formula is specifically:

[0042]

[0043] Among them, F is the decreasing parameter, F α is the preset standard decreasing parameter, R is the correlation coefficient between the preset standard fault operation curve and the fault operation curve, R α is the preset allowable correlation coefficient, and G is the preset range coefficient.

[0044] In order to achieve the above object, the present invention also provides an operation and maintenance system of a relay protection system, comprising:

[0045] A partitioning module is used to obtain the state parameters of the relay protection device and partition the relay protection device according to the state parameters of the relay protection device;

[0046] A calculation module, used for obtaining the operating parameters of the relay protection device in each zone, and determining the stability level of the relay protection device according to the operating parameters of the relay protection device in each zone;

[0047] The maintenance module is used to determine the warning type of the relay protection device according to the stability level, and determine the maintenance time of the relay protection device according to the warning type.

[0048] The beneficial effects of the present invention are:

[0049] By applying the above technical scheme, the present invention realizes the accurate partitioning of the relay protection device by acquiring the status information of the relay protection device in real time, determines the operating stability according to the operating parameters of the relay protection device in each partition, and mines the operating parameters based on the data mining algorithm, determines the corresponding warning type and sets the maintenance time, so that the operation and maintenance personnel can carry out maintenance in time according to the warning type, which greatly improves the operation and maintenance effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 The overall flow chart of an operation and maintenance method of a relay protection system proposed in an embodiment of the present invention is shown;

[0052] Figure 2 A structural schematic diagram of an operation and maintenance system of a relay protection system proposed in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] The present application embodiment provides an operation and maintenance method of a relay protection system, such as Figure 1 As shown, including:

[0055] S101, obtaining state parameters of a relay protection device, and partitioning the relay protection device according to the state parameters of the relay protection device;

[0056] In some embodiments of the present application, the obtaining of the state parameters of the relay protection device includes: obtaining the operating temperature of the relay protection device, and drawing an operating temperature change curve according to the operating temperature of the relay protection device; performing curve fitting on the operating temperature change curve to obtain a working temperature fitting curve, and determining the predicted time for the working temperature to reach a first preset threshold value according to the working temperature fitting curve; and standardizing the predicted time for the working temperature to reach the first preset threshold value to obtain the state parameters of the relay protection device.

[0057] In this embodiment, the operating temperature of the relay protection device is obtained in real time through a temperature sensor, and the operating temperature curve is predicted based on a curve fitting method. The predicted time for the operating temperature to reach the first preset threshold is standardized to achieve status monitoring of the relay protection device.

[0058] In some embodiments of the present application, the partitioning of the relay protection device according to the state parameters of the relay protection device includes: establishing a state parameter data set according to the state parameters of the relay protection device, and randomly selecting k initial clustering centers of the state parameter data set; calculating the Euclidean distance from the state parameters in the state parameter data set to the initial clustering center, and dividing the state parameters into corresponding partitions according to the Euclidean distance from the state parameters in the state parameter data set to the initial clustering center; calculating the average value of the state parameters in each partition, and recalculating the clustering center according to the average value of the state parameters in each partition; repeatedly iterating the above steps until the clustering center no longer changes or the number of iterations reaches a preset iteration threshold, obtaining k final clustering centers, and determining the partition of the relay protection device corresponding to each state parameter according to the clustering results.

[0059] In this embodiment, the k value is set to 3, and the state parameters of the relay protection devices are partitioned based on the k-means clustering algorithm, and each relay protection device is divided into three partitions according to the state parameters.

[0060] S102, obtaining operating parameters of the relay protection devices in each zone, and determining the stability level of the relay protection devices according to the operating parameters of the relay protection devices in each zone;

[0061] In some embodiments of the present application, determining the stability level of the relay protection device based on the operating parameters of the relay protection device in each partition includes: standardizing the operating parameters of the relay protection device in each partition to obtain the standardized operating parameters; establishing an operating parameter radar chart based on the standardized operating parameters, and calculating the area of ​​the operating parameter radar chart; obtaining the cluster center of the partition where the relay protection device is located, and setting the partition weight according to the cluster center of the partition where the relay protection device is located; correcting the area of ​​the operating parameter radar chart according to the partition weight, and determining the stability level of the relay protection device according to the area of ​​the corrected operating parameter radar chart.

[0062] In this embodiment, the operating parameters of the relay protection device are specifically the temperature, humidity, current value, voltage value, phase angle, etc. corresponding to the relay protection device. Each operating parameter is standardized, and an operating parameter radar chart is established with the value of each operating parameter as the vertex. The partition weight is set according to the cluster center of the partition where the relay protection device is located. The higher the value of the cluster center, the greater the corresponding partition weight. The stability level of the relay protection device is determined by the area of ​​the operating parameter radar chart corrected by the partition weight.

[0063] In some embodiments of the present application, determining the stability level of the relay protection device based on the area of ​​the modified operating parameter radar chart includes: obtaining a preset standard radar chart area, calculating the difference between the area of ​​the modified operating parameter radar chart and the area of ​​the preset standard radar chart to obtain the radar chart area difference; judging whether the radar chart area difference is greater than a second preset threshold value, and if the radar chart area difference is greater than the second preset threshold value, setting the preset first stability level as the stability level of the relay protection device; if the radar chart area difference is less than or equal to the second preset threshold value, judging whether the radar chart area difference is greater than a third preset threshold value; if the radar chart area difference is greater than the third preset threshold value, setting the preset second stability level as the stability level of the relay protection device; and if the radar chart area difference is less than or equal to the third preset threshold value, setting the preset third stability level as the stability level of the relay protection device.

[0064] In this embodiment, the stability level is sorted as follows: the first stability level < the second stability level < the third stability level. The stability level is determined by the area difference of the radar chart. The smaller the area difference, the higher the corresponding stability level.

[0065] S103, determining the warning type of the relay protection device according to the stability level, and determining the maintenance time of the relay protection device according to the warning type.

[0066] In some embodiments of the present application, determining the warning type of a relay protection device based on the stability level includes: obtaining historical fault data of the relay protection device, wherein the historical fault data of the relay protection device includes historical operating parameters and corresponding warning types; obtaining the stability level of the relay protection device, mining strong association rules of the historical fault data according to the stability level of the relay protection device based on the apriori algorithm, and determining the warning type of the relay protection device according to the strong association rules.

[0067] In some embodiments of the present application, the strong association rules of historical fault data mined according to the stability level of the relay protection device based on the apriori algorithm include: discretizing the historical fault data of the relay protection device to obtain discretized historical fault data; obtaining a preset minimum support threshold, and mining historical operating parameters with a support greater than or equal to the preset minimum support threshold based on the apriori algorithm according to the warning type of the historical fault data; determining the minimum confidence threshold according to the stability level of the relay protection device, and mining historical operating parameters with a confidence greater than or equal to the minimum confidence threshold among the historical operating parameters with a support greater than or equal to the preset minimum support threshold according to the warning type of the historical fault data to obtain strong association rules.

[0068] In this embodiment, a default minimum confidence threshold is preset. For relay protection devices with a stability level of three, the default minimum confidence threshold is used as the minimum confidence threshold of the data mining algorithm. The lower the stability level, the smaller the set minimum confidence threshold. The warning type of the relay protection device is determined by a strong association rule.

[0069] In some embodiments of the present application, determining the maintenance time of the relay protection device according to the warning type includes: determining the fault operation parameters corresponding to the warning type according to the warning type of the relay protection device, and drawing the fault operation curve according to the fault operation parameters; obtaining a preset standard fault operation curve, calculating the correlation coefficient between the preset standard fault operation curve and the fault operation curve, and determining the decreasing parameter according to the correlation coefficient between the preset standard fault operation curve and the fault operation curve; performing curve fitting on the fault operation curve to obtain a fault operation fitting curve, and correcting the coefficient of the fault operation fitting curve according to the decreasing parameter; predicting the time required for the fault operation parameter to reach a fourth preset threshold value according to the fault operation fitting curve after the coefficient correction, and determining the maintenance time of the relay protection device according to the time required for the fault operation parameter to reach the fourth preset threshold value.

[0070] In some embodiments of the present application, determining the decrement parameter according to the correlation coefficient between the preset standard fault operation curve and the fault operation curve includes: determining the decrement parameter according to a decrement parameter calculation formula, wherein the decrement parameter calculation formula is specifically:

[0071]

[0072] Among them, F is the decreasing parameter, F α is the preset standard decreasing parameter, R is the correlation coefficient between the preset standard fault operation curve and the fault operation curve, R α is the preset allowable correlation coefficient, and G is the preset range coefficient.

[0073] In this embodiment, the Pearson correlation coefficients of the preset standard fault operation curve and the fault operation curve are calculated respectively, and the Pearson correlation coefficients of the two fault curves are added to obtain the correlation coefficient of the two fault curves. The higher the correlation coefficient, the stronger the correlation between the two fault curves. The polynomial of the fault operation curve is obtained by curve fitting the fault operation curve, and the highest order coefficient in the polynomial is replaced by a decreasing parameter to realize the coefficient correction of the fault operation fitting curve. The preset standard decreasing parameter F α is a negative number, the time required for the fault operation parameter to reach the fourth preset threshold is determined as the maintenance time of the relay protection device.

[0074] Based on the same technical concept, such as Figure 2 As shown, the present invention also provides an operation and maintenance system of a relay protection system, comprising:

[0075] A partitioning module is used to obtain the status parameters of the relay protection device and partition the relay protection device according to the status parameters of the relay protection device; a calculation module is used to obtain the operating parameters of the relay protection device in each partition and determine the stability level of the relay protection device according to the operating parameters of the relay protection device in each partition; a maintenance module is used to determine the warning type of the relay protection device according to the stability level and determine the maintenance time of the relay protection device according to the warning type.

[0076] By applying the above technical scheme, the present invention discloses an operation and maintenance method and system of a relay protection system, including obtaining the state parameters of the relay protection device, partitioning the relay protection device according to the state parameters of the relay protection device; obtaining the operating parameters of the relay protection device in each partition, determining the stability level of the relay protection device according to the operating parameters of the relay protection device in each partition; determining the early warning type of the relay protection device according to the stability level, and determining the maintenance time of the relay protection device according to the early warning type. The present invention can accurately determine the early warning type according to the state of the relay protection device and issue an early warning in time, effectively improving the operation and maintenance effect of the relay protection system.

[0077] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present invention can be implemented by hardware, or by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each implementation scenario of the present invention.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for operating and maintaining a relay protection system, characterized in that: include: Acquire state parameters of the relay protection device, and partition the relay protection device according to the state parameters of the relay protection device; Obtaining the operating parameters of the relay protection devices in each zone, and determining the stability level of the relay protection devices according to the operating parameters of the relay protection devices in each zone; The warning type of the relay protection device is determined according to the stability level, and the maintenance time of the relay protection device is determined according to the warning type.

2. The operation and maintenance method of the relay protection system according to claim 1, characterized in that: The obtaining of the state parameters of the relay protection device includes: Obtain the working temperature of the relay protection device, and draw a working temperature change curve according to the working temperature of the relay protection device; Performing curve fitting on the working temperature variation curve to obtain a working temperature fitting curve, and determining a predicted time when the working temperature reaches a first preset threshold value according to the working temperature fitting curve; The predicted time for the operating temperature to reach the first preset threshold is standardized to obtain the state parameters of the relay protection device.

3. The operation and maintenance method of the relay protection system according to claim 2, characterized in that: Partitioning the relay protection device according to the state parameters of the relay protection device includes: A state parameter data set is established according to the state parameters of the relay protection device, and k initial clustering centers of the state parameter data set are randomly selected; Calculate the Euclidean distance from the state parameter in the state parameter data set to the initial cluster center, and divide the state parameter into corresponding partitions according to the Euclidean distance from the state parameter in the state parameter data set to the initial cluster center; Calculate the average value of the state parameters in each partition, and recalculate the cluster center based on the average value of the state parameters in each partition; Repeat the above steps until the cluster center no longer changes or the number of iterations reaches the preset iteration threshold, and obtain k final cluster centers. According to the clustering results, determine the partition of the relay protection device corresponding to each state parameter.

4. The operation and maintenance method of the relay protection system according to claim 1, characterized in that: Determining the stability level of the relay protection device according to the operating parameters of the relay protection device in each zone includes: Standardize the operating parameters of the relay protection devices in each zone to obtain standardized operating parameters; Establish an operating parameter radar chart based on the standardized operating parameters, and calculate the area of ​​the operating parameter radar chart; Obtain the cluster center of the partition where the relay protection device is located, and set the partition weight according to the cluster center of the partition where the relay protection device is located; The area of ​​the operating parameter radar chart is corrected according to the partition weight, and the stability level of the relay protection device is determined according to the area of ​​the corrected operating parameter radar chart.

5. The operation and maintenance method of the relay protection system according to claim 4, characterized in that: Determining the stability level of the relay protection device according to the area of ​​the corrected operating parameter radar chart includes: Obtain the area of ​​the preset standard radar chart, calculate the difference between the area of ​​the corrected operating parameter radar chart and the area of ​​the preset standard radar chart, and obtain the radar chart area difference; Determine whether the radar chart area difference is greater than a second preset threshold value, and if the radar chart area difference is greater than the second preset threshold value, set the preset first stability level as the stability level of the relay protection device; If the radar chart area difference is less than or equal to the second preset threshold, determining whether the radar chart area difference is greater than a third preset threshold; If the radar chart area difference is greater than a third preset threshold, the preset second stability level is set as the stability level of the relay protection device; If the radar chart area difference is less than or equal to the third preset threshold, the preset third stability level is set as the stability level of the relay protection device.

6. The operation and maintenance method of the relay protection system according to claim 1, characterized in that: Determining the warning type of the relay protection device according to the stability level includes: Acquire historical fault data of the relay protection device, wherein the historical fault data of the relay protection device includes historical operating parameters and corresponding warning types; The stability level of the relay protection device is obtained, and the strong association rules of the historical fault data are mined according to the stability level of the relay protection device based on the apriori algorithm. The warning type of the relay protection device is determined according to the strong association rules.

7. The operation and maintenance method of the relay protection system according to claim 6, characterized in that: The method of mining strong association rules of historical fault data according to the stability level of the relay protection device based on the apriori algorithm includes: Discretize the historical fault data of the relay protection device to obtain discretized historical fault data; Obtain a preset minimum support threshold, and mine historical operating parameters whose support is greater than or equal to the preset minimum support threshold based on the warning type of historical fault data based on the apriori algorithm; The minimum confidence threshold is determined according to the stability level of the relay protection device, and the historical operating parameters with confidence greater than or equal to the minimum confidence threshold are mined from the historical operating parameters with support greater than or equal to the preset minimum support threshold according to the warning type of the historical fault data to obtain strong association rules.

8. The operation and maintenance method of the relay protection system according to claim 6, characterized in that: Determining the maintenance time of the relay protection device according to the warning type includes: Determine the fault operation parameters corresponding to the warning type according to the warning type of the relay protection device, and draw the fault operation curve according to the fault operation parameters; Obtaining a preset standard fault operation curve, calculating a correlation coefficient between the preset standard fault operation curve and the fault operation curve, and determining a decreasing parameter according to the correlation coefficient between the preset standard fault operation curve and the fault operation curve; Performing curve fitting on the fault operation curve to obtain the fault operation fitting curve, and correcting the coefficient of the fault operation fitting curve according to the decreasing parameter; The time required for the fault operation parameter to reach the fourth preset threshold is predicted according to the coefficient-corrected fault operation fitting curve, and the maintenance time of the relay protection device is determined according to the time required for the fault operation parameter to reach the fourth preset threshold.

9. The operation and maintenance method of the relay protection system according to claim 8, characterized in that: The step of determining the decreasing parameter according to the correlation coefficient between the preset standard fault operation curve and the fault operation curve includes: The decreasing parameter is determined according to the decreasing parameter calculation formula, and the decreasing parameter calculation formula is specifically: Among them, F is the decreasing parameter, F α is the preset standard decreasing parameter, R is the correlation coefficient between the preset standard fault operation curve and the fault operation curve, R α is the preset allowable correlation coefficient, and G is the preset range coefficient.

10. An operation and maintenance system for a relay protection system, characterized in that: include: A partitioning module is used to obtain the state parameters of the relay protection device and partition the relay protection device according to the state parameters of the relay protection device; A calculation module, used for obtaining the operating parameters of the relay protection device in each zone, and determining the stability level of the relay protection device according to the operating parameters of the relay protection device in each zone; The maintenance module is used to determine the warning type of the relay protection device according to the stability level, and determine the maintenance time of the relay protection device according to the warning type.

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