Relay protection online checking method based on subitem comprehensive indexes

Abstract

The invention discloses a subentry comprehensive index-based relay protection online checking method, which relates to the technical field of relay protection, and comprises the following steps of: determining the relationship between a setting item and selectivity, sensitivity and quickness of a regional power grid taking a device as a protection unit; judging whether the sensitivity, the selectivity and the quickness of the protection setting value and the action time meet the requirements or not; the method comprises the following steps of: sequentially maintaining a device model, a setting item and a protection principle contained in a protection device in a system by utilizing a layering idea, performing constant value sub-item checking, and giving a sub-item checking report. According to the method, protection selectivity, sensitivity and quickness are independently checked and finally uniformly compared, the checking result is displayed visually and easily, the problems that a regional power grid is complex in structure and various in protection configuration are better solved, operation and maintenance personnel can obtain a visual analysis result and timely early warning information, the checking efficiency is improved, and the maintenance cost is reduced. And meanwhile, the workload of workers is relieved.

Description

Technical Field

[0001] The invention relates to the technical field of relay protection, and in particular to an online verification method for relay protection based on sub-item comprehensive indicators. Background Art

[0002] At present, with the continuous expansion of the scale of power grids, higher and higher requirements are put forward for the safety and reliability of power systems. As the first line of defense to ensure stable power supply for users, 10kV line protection devices can quickly and accurately respond to various faults and abnormal operating conditions of the line. When a line fault occurs, it can isolate the fault point in time, maximize the safety and uninterrupted power supply, and minimize the number of users who suffer power outages. Therefore, the reliability of the protection device operation is crucial.

[0003] As the power load continues to grow, the number of 10 kV lines and their protection devices has increased year by year, resulting in a significant increase in the number of 10 kV lines in unprotected operation. In order to further improve the reliability of power supply, meet the growing sense of power users, and strengthen the work requirements of production site operations, it is necessary to continuously improve the safe and stable operation capabilities of power grid equipment and strengthen the operation and processing capabilities of the secondary system. In particular, in the secondary operation and inspection of substations, the line unprotected operation processing time is required to be no more than 50 minutes. For the characteristics of the complex regional power grid structure and the protection configuration that is mostly based on protection devices, this can improve the efficiency of protection verification and ensure the stable operation of the power grid.

[0004] The connotation of relay protection reliability includes two aspects: accuracy of protection setting and stability of protection device. The stability of the protection device depends on the manufacturing quality of the protection device itself, the connection of the protection circuit and the level of operation and maintenance, and can be improved by carrying out condition maintenance technology. In addition to relying on reasonable setting calculation, the accuracy of protection setting also requires the cooperation of online verification technology. Real-time online verification can ensure that the protection setting items (setting value and action time) are checked when the operation mode of the power grid changes, so that the setting can still maintain selectivity, sensitivity and speed.

[0005] The existing online verification of relay protection values ​​is widely used in provincial power grids, but it focuses on the verification of protection sensitivity and the verification of distance III section to avoid overload, which is not applicable to the complex grid structure of regional power grids; the verification method based on the fault point set verifies multiple protections with the fault point as the center, but it is prone to omissions; and the primary and secondary system joint simulation method and the verification method based on comprehensive setting comparison and protection range comparison are still lacking in comprehensive verification of the rationality of the setting.

[0006] In the regional power grid with the device as the protection unit, the relationship between the setting item and the selectivity, sensitivity and quickness is determined. Each setting item consists of a setting value and an action time. The sensitivity of the protection depends on the setting value, the quickness is determined by the action time, and the selectivity of the protection is affected by both the setting value and the action time. Although the existing technical method can accurately check the setting value, the operation steps performed by the operation and maintenance personnel are complicated, the verification efficiency is slightly low, and the workload of the staff is relatively heavy. The time cost required is relatively high. Summary of the invention

[0007] The technical problem to be solved by the present invention is to solve the deficiencies in the prior art and to design an online verification method for relay protection based on sub-item comprehensive indicators. Through the idea of ​​sub-item protection verification, both targeted verification and overall verification can be met at the same time, thereby improving the efficiency of protection verification.

[0008] The technical solution adopted by the present invention to solve its technical problem is:

[0009] In a first aspect, the present invention provides an online verification method for relay protection based on sub-item comprehensive indicators, comprising:

[0010] For regional power grids with devices as protection units, determine the relationship between setting items and selectivity, sensitivity and quickness;

[0011] Determine whether the sensitivity, selectivity and speed of protection setting and action time meet the requirements;

[0012] Utilizing the idea of ​​​​layering, the device models, setting items and protection principles included in the protection devices are maintained in the system in turn, and the set value sub-item verification is carried out, and a sub-item verification report is given.

[0013] As a further technical solution of the present invention, the regional power grid with the device as the protection unit determines the relationship between the setting item and the selectivity, sensitivity and speed; specifically includes:

[0014] The setting items include setting value and action time; sensitivity is determined by the setting value; selectivity is determined by the setting value and action time when it is the coordination between protections within the protection device; it is determined by the setting value when it is the coordination between protections of different devices; speed is determined by the action time.

[0015] As a further technical solution of the present invention, the hierarchical concept is used to sequentially maintain the device model, setting items and protection principle included in the protection device in the system, and perform the setting value item verification, which specifically includes:

[0016] Obtain internal data of relay protection setting software and dispatching automation system;

[0017] Conduct online verification of the internal data of the relay protection setting software and the internal data of the dispatching automation system according to the setting items and protection principles;

[0018] The internal data of the relay protection software includes the functional location of the primary equipment grid resources, the calculated impedance parameters of the primary equipment, two topological relationship graphs, protection templates and instantiated protection;

[0019] The internal data of the dispatching automation system includes the functional location of the primary equipment power grid resources, the calculated rated parameters of the primary equipment, two topological relationship graphs, and real-time operating mode status.

[0020] As a further technical solution of the present invention, the internal data of the relay protection setting software and the internal data of the dispatching automation system are checked online according to the setting items and protection principles; specifically, the following steps are included:

[0021] Horizontal timing setting value verification is used to verify the coordination relationship between the protection setting value and the action time in this device;

[0022] Protection longitudinal timing check is used to check the setting values ​​and time limits between the setting items of adjacent protection devices;

[0023] Speed ​​check is used to check whether each sequence of the protection device meets the speed standard of the power grid;

[0024] Longitudinal protection range verification is used to verify whether the timing protection between different lines meets the selectivity requirements;

[0025] Real-time set value reading and verification, by reading the protection set value of the setting software or the on-site device and comparing it with the set value in the set value list;

[0026] Protection setting scheme verification is a process for comprehensive verification of protection exits, dead zones, coordination timing, and rapidity verification alarm information.

[0027] As a further technical solution of the present invention, the horizontal timing constant value check is performed according to three angles, namely:

[0028] The action time limit is within the prescribed range;

[0029] The time limit of low timing protection should be at least one level lower than that of high timing protection;

[0030] For under-start protection, the low timing setting value shall not be greater than the high timing setting value; for over-start protection, the low timing setting value shall not be less than the high timing setting value.

[0031] As a further technical solution of the present invention, the protection longitudinal timing check includes:

[0032] Current quick-break protection and time-limited quick-break protection; the action time of current stage I protection is a fixed value, and the action time limit of current stage II protection is based on the action time limit of the coordinated protection with an additional time difference.

[0033] As a further technical solution of the present invention, the speed check specifically includes:

[0034] Configure the speediness standard of sequential protection according to the grid topology connection and the condition of the protected equipment combined with economic standards;

[0035] Compare the set time limit of the protection with the speediness standard of the sequential protection to determine whether the speediness requirements are met.

[0036] As a further technical solution of the present invention, the longitudinal protection range verification specifically includes:

[0037] For stage I protection, the minimum protection range and maximum protection range are checked separately;

[0038] For the backup protection, check the protection setting corresponding to the protection range extended to the adjacent equipment;

[0039] For the backup section protection, first establish the coordination relationship according to the grid structure, determine the coordination setting items between the protection devices through the coordination relationship, calculate the protection range, and judge whether the protection range is correct according to the principle that the set protection range is smaller than the coordinated protection range.

[0040] As a further technical solution of the present invention, the real-time fixed value reading and verification specifically includes:

[0041] For the omissions made by the operating personnel when entering the set values ​​and for the set values ​​that have not been checked for a long time, the entry is compared; by reading the protection set values ​​of the setting software or the on-site device, and comparing it with the set values ​​in the setting list, the verification principle is: if the set value type is digital, and the existing set value differs from the set value in the setting list by more than ±3%, an alarm signal is issued; if the set value type is status font, and the two are inconsistent, an alarm signal is issued.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. The online verification method of relay protection based on sub-item comprehensive indicators of the present invention is aimed at regional power grids. The protection selectivity, sensitivity and speed are independently verified, and finally compared uniformly. The verification results are displayed intuitively and easily understood, which better solves the problems of complex regional power grid structure and numerous protection configurations, so that operation and maintenance personnel can obtain intuitive analysis results and timely warning information.

[0044] 2. The method described in the present invention can accurately verify the result of the fixed value, and the operation steps performed by the operation and maintenance personnel are greatly reduced, which not only improves the verification efficiency, but also reduces the workload of the staff and achieves better results.

[0045] 3. The verification results of the present invention are intuitive and easy to understand, and problems with the fixed values ​​can be discovered in a timely manner. The verification results of the fixed values ​​in the area are accurate, and the operation steps performed by the operation and maintenance personnel are greatly reduced, which not only improves the verification efficiency, but also reduces the workload of the staff, achieving better results. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A flow chart of the online verification method for relay protection based on sub-item comprehensive indicators proposed by the present invention;

[0047] Figure 2 It is a relationship diagram between the items and the three properties proposed by the present invention;

[0048] Figure 3 It is a schematic diagram of the setting item verification content proposed by the present invention;

[0049] Figure 4 It is a flow chart of the method for checking the sub-item comprehensive indicators proposed by the present invention;

[0050] Figure 5 It is a schematic diagram of the protection setting longitudinal timing verification process proposed by the present invention;

[0051] Figure 6 It is a schematic diagram of the protection setting sensitivity calibration process proposed by the present invention;

[0052] Figure 7 It is a schematic diagram of the vertical protection range verification process proposed in the present invention. DETAILED DESCRIPTION

[0053] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments:

[0054] It should be noted that the structures, colors, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0055] Embodiment 1

[0056] like Figure 1 As shown, the present invention provides an online verification method for relay protection based on sub-item comprehensive indicators, including:

[0057] Step 101, determining the relationship between the setting item and the selectivity, sensitivity and quickness for the regional power grid with the device as the protection unit;

[0058] Step 102, judging whether the sensitivity, selectivity and speed of the protection setting value and action time meet the requirements;

[0059] Step 103, using the layered concept, sequentially maintain the device model, setting items and protection principle included in the protection device in the system, and perform fixed value item verification.

[0060] The purpose of the present invention is to better solve the problem of reliability of relay protection settings. An online verification method for relay protection settings based on sub-item comprehensive indicators is proposed. This method verifies protection selectivity, sensitivity and speed by sub-items and makes unified planning. It can better solve the problems of complex regional power grid structure and numerous protection configurations, so that operation and maintenance personnel can obtain intuitive analysis results and timely warning information.

[0061] See also Figure 2 and Figure 3 In step 101, the regional power grid with the device as the protection unit determines the relationship between the setting item and the selectivity, sensitivity and speed; specifically, it includes:

[0062] The setting items include setting value and action time; sensitivity is determined by the setting value; selectivity is determined by the setting value and action time when it is the coordination between protections within the protection device; it is determined by the setting value when it is the coordination between protections of different devices; speed is determined by the action time.

[0063] In the embodiment of the present invention, the sensitivity of the protection depends on the set value, the speed is determined by the action time, the selectivity of the protection is jointly affected by the set value and the action time, and the selectivity of the protection can be divided into two relationships based on the device: the coordination between the protections within the protection device and the coordination between the protections of different devices.

[0064] See also Figure 4 In step 103, using the layered concept, the device models, setting items and protection principles included in the protection devices are maintained in the system in turn, and the setting value sub-item verification is performed, specifically including:

[0065] Obtain internal data of relay protection setting software and dispatching automation system;

[0066] Conduct online verification of the internal data of the relay protection setting software and the internal data of the dispatching automation system according to the setting items and protection principles;

[0067] The internal data of the relay protection software includes the functional location of the primary equipment grid resources, the calculated impedance parameters of the primary equipment, two topological relationship graphs, protection templates and instantiated protection;

[0068] The internal data of the dispatching automation system includes the functional location of the primary equipment power grid resources, the calculated rated parameters of the primary equipment, two topological relationship graphs, and real-time operating mode status.

[0069] Among them, the internal data of the relay protection setting software and the internal data of the dispatching automation system are checked online according to the setting items and protection principles; specifically including:

[0070] Horizontal timing setting value verification is used to verify the coordination relationship between the protection setting value and the action time in this device;

[0071] Protection longitudinal timing check is used to check the setting values ​​and time limits between the setting items of adjacent protection devices;

[0072] Speed ​​check is used to check whether each sequence of the protection device meets the speed standard of the power grid;

[0073] Longitudinal protection range verification is used to verify whether the timing protection between different lines meets the selectivity requirements;

[0074] Real-time set value reading and verification, by reading the protection set value of the setting software or the on-site device and comparing it with the set value in the set value list;

[0075] Protection setting scheme verification is a process for comprehensive verification of protection exits, dead zones, coordination timing, and rapidity verification alarm information.

[0076] In the embodiment of the present invention, the horizontal timing constant value check is performed according to three angles, namely:

[0077] The action time limit should be within the specified range;

[0078] The time limit of low timing protection should be at least one level lower than that of high timing protection;

[0079] For under-start protection, the low timing setting value shall not be greater than the high timing setting value; for over-start protection, the low timing setting value shall not be less than the high timing setting value.

[0080] See also Figure 5 In the embodiment of the present invention, the protection longitudinal timing check includes:

[0081] Current quick-break protection and time-limited quick-break protection; the action time of current stage I protection is a fixed value, and the action time limit of current stage II protection is based on the action time limit of the coordinated protection with an additional time difference.

[0082] In the embodiment of the present invention, the action time of the current section I protection is related to the inherent action time of the relay, and its action time is a fixed value. The action time limit of the current section II protection should be based on the action time limit of the coordinated protection and add a time difference; the current section II protection needs to be coordinated with the section I of the adjacent line, that is, the coordination between different devices, so the section II protection setting value needs to have a certain delay, so its setting value is determined by the delay and the adjacent section I protection time; after the action time verification meets the requirements, check whether the set value meets the requirements.

[0083] In the embodiment of the present invention, a time limit of a certain verified protection should be greater than the coordinated protection time limit by at least one level difference.

[0084] See also Figure 6 The sensitivity is expressed by the sensitivity coefficient Ksen, which refers to the ability of the protection device to respond to faults or abnormal conditions within the protection range. The sensitivity is determined by the fault quantity and the setting value. When designing the protection setting scheme, in order to meet the selectivity requirements, it is necessary to set a delay when setting certain protections.

[0085] In the embodiment of the present invention, the speed check specifically includes:

[0086] Configure the speediness standard of sequential protection according to the grid topology connection and the condition of the protected equipment combined with economic standards;

[0087] Compare the set time limit of the protection with the speediness standard of the sequential protection to determine whether the speediness requirements are met.

[0088] See also Figure 7 In the embodiment of the present invention, the longitudinal protection range check specifically includes:

[0089] For stage I protection, the minimum protection range and maximum protection range are checked separately;

[0090] For the backup protection, check the protection setting corresponding to the protection range extended to the adjacent equipment;

[0091] For the backup section protection, first establish the coordination relationship according to the grid structure, determine the coordination setting items between the protection devices through the coordination relationship, calculate the protection range, and judge whether the protection range is correct according to the principle that the set protection range is smaller than the coordinated protection range.

[0092] Preferably, the protection setting scheme verification is a process of comprehensive verification of the protection output, dead zone, coordination timing, and rapidity verification alarm information.

[0093] In the embodiment of the present invention, the real-time fixed value reading and verification specifically includes:

[0094] For the omissions made by the operating personnel when entering the set values ​​and for the set values ​​that have not been checked for a long time, the entry is compared; by reading the protection set values ​​of the setting software or the on-site device, and comparing it with the set values ​​in the setting list, the verification principle is: if the set value type is digital, and the existing set value differs from the set value in the setting list by more than ±3%, an alarm signal is issued; if the set value type is status font, and the two are inconsistent, an alarm signal is issued.

[0095] Embodiment 2

[0096] The embodiment of the present invention performs theoretical deduction, auxiliary verification and simulation verification on the basis of the first embodiment, wherein the theoretical deduction of the itinerary starts with the maximum time required for equipment transportation being T s , the maximum distance of equipment transportation is L max , the minimum speed of equipment transportation is V min .

[0097] Theoretical formula: T s =L max / V min；

[0098] The operation links of the operation and maintenance personnel are divided into determining the substation operation mode, applying for the protection pressure plate withdrawal order and executing the protection pressure plate withdrawal operation. Finally, the fixed values ​​are checked with the maintenance personnel. By counting the time of each operation link, the time required for the operation and maintenance operation is theoretically deduced.

[0099] The online verification method of fixed value is divided into safety measures arrangement, online fixed value verification, and verification of fixed value. By calculating the time of each link of the operation steps, the time of using the new fixed value verification method is theoretically derived.

[0100] The auxiliary verification is to determine the substation operation release of the operation and maintenance operation through the substation grid topology diagram, apply for the protection pressure plate to exit, and check and modify the set value; the maintenance operation is to arrange the installation measures and check the set value through the online set value verification method;

[0101] Simulation verification: By counting the equipment transportation distance and equipment transportation speed, the maximum distance L is obtained. max The minimum speed is 27 km. min The theoretical maximum time is T s =27min.

[0102] At the same time, through 10 actual journeys, it was found that the maximum time required for operation and maintenance personnel was 29.4 minutes, which is roughly the same as the theoretical calculation value. The equipment transportation time statistics are shown in Table 1:

[0103] Table 1

[0104]

[0105]

[0106] By counting the time of each link of the operation and maintenance personnel, it is found that the maximum confirmation time is 1.1 minutes, the maximum application time is 2.5 minutes, the maximum execution time is 1.3 minutes, and the maximum operation and maintenance time is 4.9 minutes in total. See Table 2 below:

[0107] Table 2

[0108]

[0109] By counting the time of work links similar to the set value verification, it was found that the maximum time for deploying safety measures is 3 minutes, the time for modifying the set value is 5.8 minutes, the time for checking the set value at each interval is 5.9 minutes, and the maximum time for online verification of the new set value is 14.7 minutes in total.

[0110] From the above statistical analysis, it can be seen that the start of the trip takes 29.4 minutes, the operation and maintenance operation takes 4.9 minutes, and the maximum time consumed by the online verification of the new constant is 14.7 minutes; the total time consumed is 49 minutes.

[0111] The following is an example of a fixed value setting simulation. A total of 30 fixed value setting simulations are performed on 10kV lines of 10 substations from October 16, 2023 to November 18, 2023, as shown in Table 3 below:

[0112] Table 3

[0113]

[0114]

[0115] The verification results are intuitive and easy to understand, and problems with the fixed values ​​can be discovered in a timely manner. The verification results for the fixed values ​​in the area are accurate, and the operation steps performed by the operation and maintenance personnel are greatly reduced, which not only improves the verification efficiency, but also reduces the workload of the staff and achieves good results. It not only liberates the cumbersome work process of the on-site staff, greatly improves the efficiency of the work of the stable fixed value setting of the power grid, but also improves user satisfaction and the company's image, and has great promotion and application value in the power industry.

[0116] The online verification method of relay protection based on sub-item comprehensive indicators of the present invention is aimed at the regional power grid, and the protection selectivity, sensitivity and speed are independently verified, and finally compared uniformly. The verification result is intuitive and easy to understand, and the problems with the fixed value can be discovered in time. The method of the present invention is accurate for the verification result of the fixed value, and the operation steps performed by the operation and maintenance personnel are greatly reduced, which not only improves the verification efficiency, but also reduces the workload of the staff, and achieves good results.

[0117] The present invention proposes an online verification method for relay protection settings based on sub-item comprehensive indicators. Based on the relevant regulations of the State Grid, the method verifies the protection selectivity, sensitivity and speed by sub-items and makes unified planning. It can better solve the problems of complex regional power grid structure and numerous protection configurations, so that operation and maintenance personnel can obtain intuitive analysis results and timely warning information.

[0118] The verification result of the present invention is displayed intuitively and is easy to understand. Problems with the fixed value can be discovered in time. The verification result of the fixed value in the area is accurate, and the operation steps performed by the operation and maintenance personnel are greatly reduced, which not only improves the verification efficiency, but also reduces the workload of the staff, and achieves better results.

[0119] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. The online verification method of relay protection based on sub-item comprehensive indicators is characterized by: include: For regional power grids with devices as protection units, determine the relationship between setting items and selectivity, sensitivity and quickness; Determine whether the sensitivity, selectivity and speed of protection setting and action time meet the requirements; Utilizing the idea of ​​stratification, the device models, setting items and protection principles of the protection devices included in the system are maintained in turn, and the set value item verification is carried out.

2. The online verification method for relay protection based on sub-item comprehensive indicators according to claim 1 is characterized in that: The regional power grid with the device as the protection unit determines the relationship between the setting item and the selectivity, sensitivity and quickness; Specifically include: The setting items include setting value and action time; The sensitivity is determined by the set value; the selectivity is determined by the set value and the action time when it is the coordination between protections within the protection device; it is determined by the set value when it is the coordination between protections of different devices; the speed is determined by the action time.

3. The online verification method for relay protection based on sub-item comprehensive indicators according to claim 1 is characterized in that: The above-mentioned hierarchical idea is to sequentially maintain the device model, setting items and protection principle of the protection device in the system, and perform the setting value item verification, which specifically includes: Obtain internal data of relay protection setting software and dispatching automation system; Conduct online verification of the internal data of the relay protection setting software and the internal data of the dispatching automation system according to the setting items and protection principles; The internal data of the relay protection software includes the functional location of the primary equipment grid resources, the calculated impedance parameters of the primary equipment, two topological relationship graphs, protection templates and instantiated protection; The internal data of the dispatching automation system includes the functional location of the primary equipment power grid resources, the calculated rated parameters of the primary equipment, two topological relationship graphs, and real-time operating mode status.

4. The online verification method for relay protection based on sub-item comprehensive indicators according to claim 3 is characterized in that: The online verification of the internal data of the relay protection setting software and the internal data of the dispatching automation system according to the setting items and protection principles specifically includes: Horizontal timing setting value verification is used to verify the coordination relationship between the protection setting value and the action time in this device; Protection longitudinal timing check is used to check the setting values ​​and time limits between the setting items of adjacent protection devices; Speed ​​check is used to check whether each sequence of the protection device meets the speed standard of the power grid; Longitudinal protection range verification is used to verify whether the timing protection between different lines meets the selectivity requirements; Real-time set value reading and verification, by reading the protection set value of the setting software or the on-site device and comparing it with the set value in the set value list; Protection setting scheme verification is a process for comprehensive verification of protection exits, dead zones, coordination timing, and rapidity verification alarm information.

5. The online verification method for relay protection based on sub-item comprehensive indicators according to claim 4 is characterized in that: The horizontal timing constant value verification is carried out from three angles, namely: The action time limit should be within the specified range; The time limit of low timing protection should be at least one level lower than that of high timing protection; For under-start protection, the low timing setting value shall not be greater than the high timing setting value; for over-start protection, the low timing setting value shall not be less than the high timing setting value.

6. The online verification method for relay protection based on sub-item comprehensive indicators according to claim 4 is characterized in that: The protection longitudinal timing check includes: Current quick-break protection and time-limited quick-break protection; the action time of current stage I protection is a fixed value, and the action time limit of current stage II protection is based on the action time limit of the coordinated protection with an additional time difference.

7. The online verification method for relay protection based on sub-item comprehensive indicators according to claim 4 is characterized in that: The speed check specifically includes: Configure the speediness standard of sequential protection according to the grid topology connection and the condition of the protected equipment combined with economic standards; Compare the set time limit of the protection with the speediness standard of the sequential protection to determine whether the speediness requirements are met.

8. The online verification method for relay protection based on sub-item comprehensive indicators according to claim 4 is characterized in that: The longitudinal protection range verification specifically includes: For stage I protection, the minimum protection range and maximum protection range are checked separately; For the backup protection, check the protection setting corresponding to the protection range extended to the adjacent equipment; For the backup protection, firstly, the coordination relationship is established according to the grid structure, and the coordination setting items between the protection devices are determined through the coordination relationship. The protection range is calculated and the protection range is less than the coordination protection range. The principle of protection scope should be followed to determine whether the protection scope is correct.

9. The online verification method for relay protection based on sub-item comprehensive indicators according to claim 4 is characterized in that: The real-time fixed value reading and verification specifically includes: For the omissions made by the operating personnel when entering the set values ​​and for the set values ​​that have not been checked for a long time, the entry is compared; by reading the protection set values ​​of the setting software or the on-site device, and comparing it with the set values ​​in the setting list, the verification principle is: if the set value type is digital, and the existing set value differs from the set value in the setting list by more than ±3%, an alarm signal is issued; if the set value type is status font, and the two are inconsistent, an alarm signal is issued.

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