A remote load test method for a double female wiring type bus protection device

Abstract

The application discloses a kind of double female wiring type bus protection device remote load testing methods, belong to substation bus protection test field.The application uses the current voltage analog quantity of protection device in the process of load test in substation sent by the signal system, whether the secondary current is correct is automatically analyzed and judged in main station end, reduce the workload of field operation personnel, also avoid the problem of human error, reduce equipment operation time;Can quickly and accurately complete the load test of bus protection, reduce manpower burden, while detecting the polarity error of current transformer in bus protection secondary circuit, current loop phase error and current loop secondary open circuit etc. Safety hazard in time, ensure the safe operation of power grid.

Description

Technical Field

[0001] This invention relates to a remote load testing method for a double-busbar connection type busbar protection device, belonging to the field of substation busbar protection testing. Background Technology

[0002] The busbar in a substation is a crucial component of the power system. If a busbar fault is not promptly isolated, it will damage all electrical equipment on the busbar and disrupt system stability, potentially causing widespread power outages or even power system collapse. Therefore, busbar protection systems capable of rapidly detecting and selectively isolating faults are essential for the safe and stable operation of the power system.

[0003] To ensure the correct operation and fault isolation of busbar protection, load tests are required before new equipment is commissioned to verify the correctness of the secondary current and voltage circuit wiring. Currently, on-site load testing to verify the polarity, turns ratio, and wiring correctness of the secondary current and voltage circuits is mainly done manually. Field personnel measure current and voltage phases to draw hexagonal diagrams and manually judge the correctness of the wiring. With the rapid development of the power system and the increasing power load, the demand for new or expanded substations and technical upgrade projects is constantly increasing, leading to a corresponding increase in the workload of verifying the correct wiring through load testing. Furthermore, relying on on-site personnel's judgment is susceptible to the influence of their experience, compromising accuracy and timeliness, and potentially affecting equipment commissioning time.

[0004] Currently, typical load tests for busbar protection include testing the protection transformer ratio, polarity, and the correctness of the protection current and voltage circuits. These tests are extensive and can take hours. Furthermore, to ensure timely equipment restoration, load tests are generally conducted at night (after equipment maintenance is completed), which not only increases the workload of on-site personnel but also increases the risk of misinterpreting test results. Summary of the Invention

[0005] This invention provides a remote load testing method for a double-busbar connection type busbar protection device to complete the load testing of busbar protection and reduce the manpower burden.

[0006] The technical solution of this invention is:

[0007] According to a first aspect of the present invention, a remote load testing method for a double-busbar connection type busbar protection device is provided, comprising: analyzing whether a first criterion is met based on the busbar protection transformer ratio test calculation results; if the first criterion is met, the system reports normal transformer ratio detection and performs busbar protection differential current test calculation; otherwise, the system reports a transformer ratio abnormality alarm, terminates the load test, and generates a load test data abnormality report; analyzing whether a second criterion is met based on the busbar protection differential current test calculation results; if the second criterion is met, the system reports normal busbar protection differential current detection and performs busbar protection voltage amplitude and phase sequence detection test calculation; otherwise, the system reports a busbar protection differential current abnormality alarm, terminates the load test, and generates a load test data abnormality report; and analyzing whether a second criterion is met based on the busbar protection voltage amplitude... Based on the phase sequence detection test calculation results, the system analyzes whether the third criterion is met. If the third criterion is met, the system reports that the bus protection voltage amplitude and phase sequence detection are normal, and performs steady-state analog quantity comparison test calculation. Otherwise, the system reports an abnormal alarm for the bus protection voltage amplitude and phase sequence detection, terminates the load test, and generates an abnormal load test data report. Based on the steady-state analog quantity comparison test calculation results, the system collects analog quantity data for analog quantity comparison and analyzes whether the fourth criterion is met. If the fourth criterion is met, the system reports that the steady-state analog quantity comparison is normal, and generates a report on the final load test data and test results. Otherwise, the system reports an abnormal alarm for the steady-state analog quantity comparison detection of the bus protection, terminates the load test, and generates an abnormal load test data report.

[0008] The first criterion is expressed as:

[0009]

[0010]

[0011]

[0012] If the above three equations are satisfied, then the bus protection transformer ratio test is correct;

[0013] Wherein, Iaj, Ibj, and Icj are the secondary current sampling values ​​of a certain bay collected by the bus protection device, which are the current data of phases A, B, and C, respectively; IAj, IBj, and ICj are the primary current of branch j, which are the primary power flow current data exchanged from the OCS system to the remote on-load test system; N CTj The CT ratios for each branch are the data exchanged between the OMS system and the remote load test system.

[0014] The second criterion is determined using one of the following criteria: large difference flow criterion or small difference flow criterion.

[0015] The large difference current criterion is expressed as follows:

[0016]

[0017] If the conditions are met, the busbar protection differential current detection is normal;

[0018] in, Id represents the large differential current calculated by the remote load testing system. 装置 This indicates that the busbar protection device is displaying a large differential current; I j This represents the digital value of the current in branch j.

[0019] The small difference current criterion is expressed as follows:

[0020] First move:

[0021]

[0022] Second move:

[0023]

[0024] If the first condition is met, then the differential current of bus I is judged to be normal; if the second condition is met, then the differential current of bus II is judged to be normal.

[0025] Among them, S 1j This indicates the position of the disconnector on the j-th branch bus I, where 0 indicates the disconnector is open and 1 indicates the disconnector is closed; Ⅰ母小差 This indicates that the busbar protection device displays the differential current of bus I; S 2j This indicates the position of the disconnector on the j-th branch II busbar, where 0 indicates the disconnector is open and 1 indicates the disconnector is closed; j I represents the digital value of the current in branch j; ML1 This indicates the digital value of the current at bus tie 1; S ML1 This indicates that the motherboard is running in parallel, 0 indicates split operation, and 1 indicates parallel operation; I Ⅱ母小差 This indicates that the busbar protection device displays the differential current of bus II.

[0026] The third criterion includes:

[0027] Amplitude criterion:

[0028]

[0029]

[0030] If all conditions are met, then the amplitude verification is normal;

[0031] Phase sequence criterion:

[0032] ∠Ua1Ub1=(115°~125°), ∠Ub1Uc1=(115°~125°), ∠Uc1Ua1=(115°~125°);

[0033] ∠Ua2Ub2=(115°~125°), ∠Ub2Uc2=(115°~125°), ∠Uc2Ua2=(115°~125°);

[0034] ∠Ua1Ua2=(0°~10°), ∠Ub1Ub2=(0°~10°), ∠Uc1Uc2=(0°~10°);

[0035] If all conditions are met, then the phase sequence is correct.

[0036] Wherein, Ua1, Ub1, and Uc1 represent the three-phase secondary voltages of bus I, and Ua2, Ub2, and Uc2 represent the three-phase secondary voltages of bus II.

[0037] The process involves collecting analog quantity data from the same source based on the steady-state analog quantity comparison test results for comparison, and analyzing whether the fourth criterion is met. Specifically, based on the steady-state analog quantity comparison test results, analog quantity data from transformer protection, fault recorder, and line protection device are collected for comparison. The three-part judgment method for analog quantity data from transformer protection, fault recorder, and line protection device is the same. The A-phase data of the transformer protection analysis analog quantity data is used for description and explanation.

[0038] Phase A current sampling data I obtained from each secondary winding of the same current transformer a1 I a2 ... I aX Based on the A-phase current sampling data of each secondary winding I a1 I a2 ... I aX The linearity of the A-phase current deviation of each secondary winding was calculated.

[0039]

[0040] Among them, I ai This represents the A-phase current sampling data for the i-th secondary winding, where X is the number of secondary windings in this interval, and β... i Let β be the linearity of the phase current deviation of the i-th secondary winding; when the linearity deviation β i When ≤3%, the steady-state analog comparison of the current loop of the bus protection device is considered correct; when β i When the value is greater than 3%, it is judged as an abnormality in the steady-state analog comparison of the current loop of the bus protection device.

[0041] According to a second aspect of the present invention, a remote load testing system for a double-busbar connection type busbar protection device is provided, comprising: a first judgment module, configured to analyze whether a first criterion is met based on the busbar protection transformer ratio test calculation results; if the first criterion is met, the system reports normal transformer ratio detection and performs busbar protection differential current test calculation; otherwise, the system reports a transformer ratio abnormality alarm, terminates the load test, and generates a load test data abnormality report; a second judgment module, configured to analyze whether a second criterion is met based on the busbar protection differential current test calculation results; if the second criterion is met, the system reports normal busbar protection differential current detection and performs busbar protection voltage amplitude and phase sequence detection test calculation; otherwise, the system reports a busbar protection differential current abnormality alarm, terminates the load test, and generates a load test data abnormality report; a third judgment module, configured to... Based on the bus protection voltage amplitude and phase sequence detection test calculation results, the system analyzes whether the third criterion is met. If the third criterion is met, the system reports that the bus protection voltage amplitude and phase sequence detection are normal and performs steady-state analog quantity comparison test calculation. Otherwise, the system reports an abnormal alarm for the bus protection voltage amplitude and phase sequence detection, terminates the load test, and generates an abnormal load test data report. The fourth judgment module, based on the steady-state analog quantity comparison test calculation results, collects analog quantity data for analog quantity comparison and analyzes whether the fourth criterion is met. If the fourth criterion is met, the system reports that the steady-state analog quantity comparison is normal and generates a report on the final load test data and test results. Otherwise, the system reports an abnormal alarm for the steady-state analog quantity comparison detection of the bus protection, terminates the load test, and generates an abnormal load test data report.

[0042] According to a third aspect of the present invention, a computing device is provided, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions, wherein the computer-executable instructions, when executed by the processor, implement the steps of the remote load testing method for the dual-bus connection type busbar protection device described in any one of the above.

[0043] According to a fourth aspect of the present invention, a computer-readable storage medium is provided that stores computer-executable instructions, which, when executed by a processor, implement the steps of the remote load testing method for a dual-busbar connection type busbar protection device as described in any one of the preceding claims.

[0044] The beneficial effects of this invention are:

[0045] This invention utilizes the simulated current and voltage quantities of protection devices during load testing within substations, transmitted from the information protection system, to automatically analyze and determine the correctness of secondary currents at the main station. This reduces the workload of on-site maintenance personnel, avoids human error, and shortens equipment commissioning time. It can quickly and accurately complete load testing of busbar protection, reducing manpower burden, and promptly detect safety hazards in the secondary circuit of busbar protection, such as current transformer polarity errors, current circuit phase errors, and open circuits in the secondary circuit, ensuring the safe operation of the power grid. Attached Figure Description

[0046] Figure 1 This is a flowchart of the method of the present invention;

[0047] Figure 2 This is a system architecture diagram of the remote load testing method for a dual-bus connection type busbar protection device provided in Embodiment 1 of the present invention. Detailed Implementation

[0048] The invention will be further described below with reference to the accompanying drawings and embodiments, but the scope of the invention is not limited to the description.

[0049] Example 1: As Figure 1-2 As shown, according to a first aspect of the present invention, a remote load testing method for a double-busbar connection type busbar protection device is provided, comprising: analyzing whether a first criterion is met based on the busbar protection transformer ratio test calculation result; if the first criterion is met, the system reports normal transformer ratio detection and performs busbar protection differential current test calculation; otherwise, the system reports a transformer ratio abnormality alarm, terminates the load test, and generates a load test data abnormality report; analyzing whether a second criterion is met based on the busbar protection differential current test calculation result; if the second criterion is met, the system reports normal busbar protection differential current detection and performs busbar protection voltage amplitude and phase sequence detection test calculation; otherwise, the system reports a busbar protection differential current abnormality alarm, terminates the load test, and generates a load test data abnormality report; and analyzing whether a second criterion is met based on the busbar protection voltage... The system calculates the voltage amplitude and phase sequence detection results and analyzes whether they meet the third criterion. If the third criterion is met, the system reports that the bus protection voltage amplitude and phase sequence detection are normal and performs steady-state analog quantity comparison test calculation. Otherwise, the system reports an abnormal alarm for the bus protection voltage amplitude and phase sequence detection, terminates the load test, and generates an abnormal load test data report. Based on the steady-state analog quantity comparison test calculation results, the system collects analog quantity data for analog quantity comparison and analyzes whether it meets the fourth criterion. If the fourth criterion is met, the system reports that the steady-state analog quantity comparison is normal and generates a report on the final load test data and test results. Otherwise, the system reports an abnormal alarm for the steady-state analog quantity comparison detection of the bus protection, terminates the load test, and generates an abnormal load test data report.

[0050] The current data of phases A, B, and C of each bay analog quantity collected by the busbar protection device are used to collect the current data of phases A, B, and C of the primary power flow to determine whether the transformation ratio is correct; the first criterion is expressed as:

[0051]

[0052]

[0053]

[0054] If the above three conditions are met, then the bus protection transformer ratio test is correct;

[0055] Wherein, Iaj, Ibj, and Icj are the secondary current sampling values ​​of a certain bay collected by the bus protection device, which are the current data of phases A, B, and C, respectively; IAj, IBj, and ICj are the primary current of branch j, which are the primary power flow current data exchanged from the dispatch automation OCS system to the remote load testing system; N CTj This refers to the CT ratio of each branch circuit and the data exchanged between the power outage management OMS system and the remote load testing system.

[0056] The second criterion is determined using one of the following criteria: the large difference flow criterion or the small difference flow criterion. That is, the second criterion is determined using one of the two criteria, and if the condition is met, it means that the second criterion is satisfied.

[0057] The differential current calculated by the remote load testing system of the bus protection device is compared with the differential current displayed by the bus protection device. The criterion for the differential current is expressed as follows:

[0058]

[0059] If the conditions are met, the busbar protection differential current detection is normal;

[0060] in, Id represents the large differential current calculated by the remote load testing system. 装置 This indicates that the busbar protection device is displaying a large differential current; I j This represents the digital value of the current in branch j.

[0061] The small difference current criterion is expressed as follows:

[0062] The first method involves comparing the differential current of Bus I calculated by the remote load testing system of the bus protection device with the differential current of Bus I displayed by the bus protection device:

[0063]

[0064] The second method involves comparing the differential current of Bus II calculated by the remote load testing system of the bus protection device with the differential current of Bus II displayed by the bus protection device:

[0065]

[0066] If the first condition is met, then the differential current of bus I is judged to be normal; if the second condition is met, then the differential current of bus II is judged to be normal.

[0067] Among them, S 1j This indicates the position of the disconnector on the j-th branch bus I, where 0 indicates the disconnector is open and 1 indicates the disconnector is closed; Ⅰ母小差 This indicates that the busbar protection device displays the differential current of bus I; S 2j This indicates the position of the disconnector on the j-th branch bus II, where 0 indicates the disconnector is open and 1 indicates the disconnector is closed; j I represents the digital value of the current in branch j; ML1 This indicates the digital value of the current at bus tie 1; S ML1 This indicates that the motherboard is running in parallel, 0 indicates split operation, and 1 indicates parallel operation; I Ⅱ母小差 This indicates that the busbar protection device displays the differential current of bus II.

[0068] The third criterion includes:

[0069] Amplitude criterion: The amplitude of bus I U collected by the remote load testing system from the bus protection. a1 U b1 U c1 and the voltage of bus II U a2 U b2 U c2 The amplitude is verified using the following expression:

[0070]

[0071]

[0072] If all conditions are met, then the amplitude verification is normal;

[0073] Phase sequence criterion:

[0074] ∠Ua1Ub1=(115°~125°), ∠Ub1Uc1=(115°~125°), ∠Uc1Ua1=(115°~125°);

[0075] ∠Ua2Ub2=(115°~125°), ∠Ub2Uc2=(115°~125°), ∠Uc2Ua2=(115°~125°);

[0076] ∠Ua1Ua2=(0°~10°), ∠Ub1Ub2=(0°~10°), ∠Uc1Uc2=(0°~10°);

[0077] If all conditions are met, then the phase sequence is correct.

[0078] Wherein, Ua1, Ub1, and Uc1 represent the three-phase secondary voltages of bus I, and Ua2, Ub2, and Uc2 represent the three-phase secondary voltages of bus II.

[0079] The process involves collecting analog quantity data from the same source based on the steady-state analog quantity comparison test results for comparison, and analyzing whether the fourth criterion is met. Specifically, based on the steady-state analog quantity comparison test results, analog quantity data from transformer protection, fault recorder, and line protection device are collected for comparison. The three-part judgment method for analog quantity data from transformer protection, fault recorder, and line protection device is the same. The A-phase data of the transformer protection analysis analog quantity data is used for description and explanation.

[0080] Phase A current sampling data I obtained from each secondary winding of the same current transformer a1 I a2 ... I aX Based on the A-phase current sampling data of each secondary winding I a1 I a2 ... I aX The linearity of the A-phase current deviation of each secondary winding was calculated.

[0081]

[0082] Among them, I ai This represents the A-phase current sampling data for the i-th secondary winding, where X is the number of secondary windings in this interval, and β... i Let β be the linearity of the phase current deviation of the i-th secondary winding; when the linearity deviation β i When ≤3%, the steady-state analog comparison of the current loop of the bus protection device is considered correct; when β i When the value is greater than 3%, it is judged as an abnormality in the steady-state analog comparison of the current loop of the bus protection device.

[0083] It should be noted that within the same busbar bay of a substation, there are typically multiple secondary windings of current transformers (CTs) and current transformers (TVs). Analog signals from devices such as main transformer protection, line protection, the first set of busbar protection, the second set of busbar protection, and fault recorders are transmitted via the information transmission substation to a remote load testing system. The remote load testing system then compares the collected steady-state analog signals. This method uses the A-phase current of the current loop as an example.

[0084] The above is a schematic scheme of the remote load testing method for a double-busbar connection type bus protection device according to this embodiment. It should be noted that the technical solution of the remote load testing system for the double-busbar connection type bus protection device and the technical solution of the aforementioned remote load testing method for the double-busbar connection type bus protection device belong to the same concept. Details not described in detail in the technical solution of the remote load testing system for the double-busbar connection type bus protection device in this embodiment can be found in the description of the technical solution of the aforementioned remote load testing method for the double-busbar connection type bus protection device.

[0085] According to a second aspect of the present invention, a remote load testing system for a double-busbar connection type busbar protection device is provided, comprising: a first judgment module, configured to analyze whether a first criterion is met based on the busbar protection transformer ratio test calculation result; if the first criterion is met, the system reports normal transformer ratio detection and performs busbar protection differential current test calculation; otherwise, the system reports a transformer ratio abnormality alarm, terminates the load test, and generates a load test data abnormality report; a second judgment module, configured to analyze whether a second criterion is met based on the busbar protection differential current test calculation result; if the second criterion is met, the system reports normal busbar protection differential current detection and performs busbar protection voltage amplitude and phase sequence detection test calculation; otherwise, the system reports a busbar protection differential current abnormality alarm, terminates the load test, and generates a load test data abnormality report; a third judgment module, configured to... Based on the bus protection voltage amplitude and phase sequence detection test calculation results, the system analyzes whether the third criterion is met. If the third criterion is met, the system reports that the bus protection voltage amplitude and phase sequence detection are normal and performs steady-state analog quantity comparison test calculation. Otherwise, the system reports an abnormal alarm for the bus protection voltage amplitude and phase sequence detection, terminates the load test, and generates an abnormal load test data report. The fourth judgment module, based on the steady-state analog quantity comparison test calculation results, collects analog quantity data from the same source for comparison and analyzes whether the fourth criterion is met. If the fourth criterion is met, the system reports that the steady-state analog quantity comparison is normal and generates a report on the final load test data and test results. Otherwise, the system reports an abnormal alarm for the steady-state analog quantity comparison detection of the bus protection, terminates the load test, and generates an abnormal load test data report.

[0086] According to a third aspect of the present invention, a computing device is provided, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions, wherein the computer-executable instructions, when executed by the processor, implement the steps of the remote load testing method for the dual-bus connection type busbar protection device described above.

[0087] According to a fourth aspect of the present invention, a computer-readable storage medium is provided that stores computer-executable instructions, which, when executed by a processor, implement the steps of the remote load testing method for a dual-busbar connection type busbar protection device described in any one of the preceding embodiments.

[0088] The storage medium proposed in this embodiment and the remote load testing method for the dual-bus connection type busbar protection device proposed in the above embodiment belong to the same inventive concept. Technical details not described in detail in this embodiment can be found in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.

[0089] Example 2:

[0090] Referring to Tables 1-3, an embodiment of the present invention provides a remote load testing method for a double-busbar connection type busbar protection device. To verify the beneficial effects of the present invention, a simulation experiment is conducted for scientific demonstration.

[0091] 1. Initial State: Once the energization of each branch interval is complete, the remote load test system for the double-busbar connection type busbar protection device begins data retrieval, requesting analog quantities of secondary current and voltage from the busbar protection device, as well as position signals of each branch circuit breaker and disconnector, and completing the acquisition of busbar protection setting data from the OMS system and power flow data from the OCS system. The data collected by the system at this time is shown in the table below:

[0092] Table 1 Data Collection Information

[0093] Secondary current of protection device 50A Analog secondary voltage of protection device 200V Branch circuit breaker position signal Open Disconnect switch position signal closure OMS system bus protection setting data Fixed value 1 OCS system power flow data information Trend Data 1

[0094] Table 2 OMS System Bus Protection Settings 1

[0095] Overcurrent protection setting 300A Short circuit protection setting 600A Ground fault protection settings 30A Remote trip setting 10km Software version number V1.0.0

[0096] Table 3 OCS System Power Flow Data 1

[0097] Equipment Name substation busbar Node Name Busbar 1 voltage level 220kV Phase A current 100A B-phase current 110A C-phase current 105A

[0098] It should be noted that the remote load testing system for double-busbar connection type bus protection devices can automatically retrieve data such as secondary current and voltage analog quantities of the bus protection device, as well as position signals of each branch circuit breaker and disconnector, without manual intervention, thus improving the efficiency and accuracy of data acquisition. The system can automatically collect bus protection setting data from the OMS system. By retrieving information such as secondary current and voltage analog quantities of the protection device, real-time bus protection setting data can be obtained, ensuring that the operating parameters of the protection device meet system requirements. The system can also automatically collect power flow data from the OCS system. By retrieving data such as secondary current and voltage analog quantities of the bus protection device, real-time power flow data can be obtained, providing accurate data support for system operation status analysis and load management. Using the remote load testing system for double-busbar connection type bus protection devices for data retrieval and information acquisition significantly improves the efficiency and accuracy of data acquisition, providing effective support for updating and managing bus protection settings and system power flow data.

[0099] 2. After the system data is retrieved, the bus protection transformer ratio test calculation begins. The calculation method is described in Example 1. The system automatically analyzes whether the criterion expression is met. If the criterion is met, the system reports that the transformer ratio detection is normal and automatically proceeds to the next step of the bus protection differential current test. Otherwise, the system reports an abnormal transformer ratio alarm and ends the load test, generating a load test data abnormality report.

[0100] According to the criterion expression for the ratio test, the ratio test is passed.

[0101] 3. Start the bus protection differential current test calculation. The calculation method is shown in Example 1. The system will automatically analyze whether the criterion expression is met. If the criterion is met, the system will report that the bus protection differential current detection is normal and automatically proceed to the next step of bus protection voltage amplitude and phase sequence detection test. Otherwise, the system will report a bus protection differential current abnormality alarm and end the load test, generating a load test data abnormality report.

[0102] According to the criterion expression for the bus protection differential current test, the bus protection differential current test is passed.

[0103] 4. Begin calculating the bus protection voltage amplitude and phase sequence detection test. The calculation method is shown in Example 1. The system will automatically analyze whether the criterion expression is met. If the criterion is met, the system will report that the bus protection voltage amplitude and phase sequence detection is normal and then automatically proceed to the next step of steady-state analog quantity comparison test. Otherwise, the system will report an abnormal alarm for the bus protection voltage amplitude and phase sequence detection and end the load test, generating an abnormal load test data report.

[0104] After the bus protection differential current test passed, the bus protection voltage amplitude and phase sequence detection test calculation was performed. The result of the voltage amplitude and phase sequence detection test calculation was: passed.

[0105] 5. Begin the steady-state analog quantity comparison test calculation. At this time, the remote load test system of the bus protection device collects analog quantity data from the transformer protection, fault recorder, and line protection device for analog quantity comparison. The calculation method is described in Example 1. The system automatically analyzes whether the criterion expression is met. If the criterion is met, the system reports that the steady-state analog quantity comparison is normal and generates the final load test data and a report indicating that the test results are normal. Otherwise, the system reports an alarm indicating an abnormality in the steady-state analog quantity comparison detection of the bus protection and ends the load test, generating an abnormal load test data report.

[0106] After the bus protection voltage amplitude and phase sequence tests passed, the steady-state analog quantity comparison test calculation began. This calculation involves collecting analog quantity data from transformer protection, fault recorder, and line protection devices for comparison, checking whether each analog quantity measurement value is within a certain error range, and calculating the analog quantity deviation error. The result of this steady-state analog quantity comparison calculation is: failed.

[0107] Because the criterion expression for the steady-state analog quantity comparison test was not met, the test was abnormal, the system terminated the load test, and generated a load test data anomaly report.

[0108] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A remote load testing method for a double-busbar connection type busbar protection device, characterized in that, include: Based on the bus protection transformer ratio test calculation results, analyze whether the first criterion is met. If the first criterion is met, the system reports that the transformer ratio test is normal and performs bus protection differential current test calculation. Otherwise, the system will report a transformation ratio abnormality alarm, terminate the load test, and generate a load test data abnormality report; Based on the bus protection differential current test calculation results, analyze whether the second criterion is met. If the second criterion is met, the system reports that the bus protection differential current detection is normal and performs bus protection voltage amplitude and phase sequence detection test calculation; otherwise, the system reports a bus protection differential current abnormality alarm, ends the load test, and generates a load test data abnormality report. Based on the bus protection voltage amplitude and phase sequence detection test calculation results, analyze whether the third criterion is met. If the third criterion is met, the system reports that the bus protection voltage amplitude and phase sequence detection is normal and performs steady-state analog quantity comparison test calculation. Otherwise, the system reports an abnormal alarm for the bus protection voltage amplitude and phase sequence detection, ends the load test, and generates an abnormal load test data report. Based on the steady-state analog quantity comparison test calculation results, analog quantity data of transformer protection, fault recorder and line protection device are collected for analog quantity comparison, and it is analyzed whether the fourth criterion is met. If the fourth criterion is met, the system reports that the steady-state analog quantity comparison is normal and generates a report of the final load test data and test results being normal. Otherwise, the system will report an alarm for abnormal bus protection steady-state analog quantity comparison detection, terminate the load test, and generate a load test data anomaly report; The first criterion is expressed as: ； If the above three equations are satisfied, then the bus protection transformer ratio test is correct; Wherein, Iaj, Ibj, and Icj are the secondary current sampling values ​​of a certain bay collected by the bus protection device, which are the current data of phases A, B, and C, respectively; IAj, IBj, and ICj are the primary current of branch j, which are the primary power flow current data exchanged from the OCS system to the remote on-load test system; N CTj For each branch CT ratio, for the data exchanged between the OMS system and the remote load test system; The second criterion is made using one of the following criteria: large difference flow criterion, small difference flow criterion; The large difference current criterion is expressed as follows: If the conditions are met, the busbar protection differential current detection is normal; in, This indicates the large differential current calculated by the remote load testing system. This indicates that the busbar protection device is displaying a large differential current; I j This represents the digital value of the current in branch j. The small difference current criterion is expressed as follows: First move: Second move: If the first condition is met, then the differential current of bus I is judged to be normal; if the second condition is met, then the differential current of bus II is judged to be normal. Among them, S 1j This indicates the position of the disconnect switch on the j-th branch bus I, where 0 indicates the disconnect switch is open and 1 indicates the disconnect switch is closed. This indicates that the busbar protection device displays the differential current of bus I; S 2j This indicates the position of the disconnector on the j-th branch bus II, where 0 indicates the disconnector is open and 1 indicates the disconnector is closed; j I represents the digital value of the current in branch j; ML1 This indicates the digital value of the current at bus tie 1; S ML1 This indicates that the motherboard is running in parallel, with 0 indicating split operation and 1 indicating parallel operation. This indicates that the busbar protection device displays the differential current of bus II.

2. The remote load testing method for the double-busbar connection type busbar protection device according to claim 1, characterized in that, The third criterion includes: Amplitude criterion: 、 、 ； 、 、 ； If all conditions are met, then the amplitude verification is normal; Phase sequence criterion: ∠Ua1Ub1=(115°~125°), ∠Ub1Uc1=(115°~125°), ∠Uc1Ua1=(115°~125°); ∠Ua2Ub2=(115°~125°), ∠Ub2Uc2=(115°~125°), ∠Uc2Ua2=(115°~125°); ∠Ua1Ua2=(0°~10°), ∠Ub1Ub2=(0°~10°), ∠Uc1Uc2=(0°~10°); If all conditions are met, then the phase sequence is correct. Wherein, Ua1, Ub1, and Uc1 represent the three-phase secondary voltages of bus I, and Ua2, Ub2, and Uc2 represent the three-phase secondary voltages of bus II.

3. The remote load testing method for the double-busbar connection type busbar protection device according to claim 1, characterized in that, The process involves comparing analog data from transformer protection, fault recorders, and line protection devices based on the steady-state analog comparison test results to determine if the fourth criterion is met. Specifically, this involves comparing analog data from transformer protection, fault recorders, and line protection devices based on the steady-state analog comparison test results. The judgment methods for the analog data of transformer protection, fault recorders, and line protection devices are the same. The judgment method for transformer protection analog data includes: A-phase current sampling data acquired from each secondary winding of the same current transformer Based on the A-phase current sampling data of each secondary winding The linearity of the A-phase current deviation of each secondary winding was calculated. ； in, This represents the A-phase current sampling data for the i-th secondary winding, where X is the number of secondary windings in this interval. Let be the linearity of the phase current deviation of the i-th secondary winding; when the linearity deviation is... When the value is ≤3%, the steady-state analog comparison of the current loop of the busbar protection device is considered correct; when... When the value is greater than 3%, it is judged as an abnormality in the steady-state analog comparison of the current loop of the bus protection device.

4. A remote load testing system for a double-busbar connection type busbar protection device for performing the method of claim 1, characterized in that, include: The first judgment module is used to analyze whether the first criterion is met based on the bus protection transformer ratio test calculation results. If the first criterion is met, the system reports that the transformer ratio test is normal and performs bus protection differential current test calculation. Otherwise, the system will report a transformation ratio abnormality alarm, terminate the load test, and generate a load test data abnormality report; The second judgment module is used to analyze whether the second criterion is met based on the bus protection differential current test calculation results. If the second criterion is met, the system reports that the bus protection differential current detection is normal and performs bus protection voltage amplitude and phase sequence detection test calculation; otherwise, the system reports a bus protection differential current abnormality alarm, ends the load test, and generates a load test data abnormality report. The third judgment module is used to analyze whether the third criterion is met based on the bus protection voltage amplitude and phase sequence detection test calculation results. If the third criterion is met, the system reports that the bus protection voltage amplitude and phase sequence detection are normal and performs steady-state analog quantity comparison test calculation. Otherwise, the system reports an abnormal alarm for the bus protection voltage amplitude and phase sequence detection, ends the load test, and generates an abnormal load test data report. The fourth judgment module collects analog quantity data from the same source for comparison based on the steady-state analog quantity comparison test calculation results, analyzes whether the fourth criterion is met, and if the fourth criterion is met, the system reports that the steady-state analog quantity comparison is normal and generates a report of the final load test data and test results being normal. Otherwise, the system will report an alarm for abnormal bus protection steady-state analog quantity comparison detection, terminate the load test, and generate a load test data anomaly report.

5. A computing device, characterized in that, include: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, they implement the steps of the remote load testing method for the double busbar protection device according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that, It stores computer-executable instructions, which, when executed by a processor, implement the steps of the remote load testing method for the dual-bus connection type busbar protection device as described in any one of claims 1 to 3.

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