Transformer no-load loss detection method and system based on partial discharge test, and medium

Abstract

The embodiment of the invention discloses a transformer no-load loss detection method and system based on a partial discharge test, and a medium. The method comprises the following steps: obtaining the partial discharge no-load loss of a transformer through the partial discharge test of the transformer; determining theoretical values of the no-load loss of the transformer under different frequencies according to the partial discharge no-load loss; carrying out loss tests on the transformer under different frequencies through a transformer predelivery test to obtain measured values of the no-load loss of the transformer under different frequencies; establishing an equivalent relation database of the no-load loss and the partial discharge no-load loss under different frequencies according to the comparison condition of the theoretical value of the no-load loss of the transformer and the measured value of the no-load loss of the transformer under the preset frequency; the transformer no-load loss detection is carried out according to the comparison condition of the transformer no-load loss measurement value in the equivalent relation database and the no-load loss data threshold value, so that the no-load loss of the transformer is detected while the partial discharge test is carried out, and the time and labor cost of the field test is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer fault detection, and in particular to a transformer no-load loss detection method, system and medium based on partial discharge test. Background Art

[0002] The country is accelerating the low-carbon upgrade of transformers and promoting the green development of the industry. According to the requirements of the Energy Bureau's "Twenty-Five Key Requirements for Preventing Power Production Accidents (2023 Edition)", newly installed 110kV main transformers should be sampled for no-load tests.

[0003] Conducting a no-load test on the transformer during the acceptance test can verify whether its performance parameters can meet the energy efficiency requirements of the transformer, and can also verify whether the transformer core has insulation or other defects. During the acceptance test of the transformer, a partial discharge test of the transformer is generally carried out. To prevent and control the saturation of the core, the frequency of the partial discharge test is generally higher than the rated frequency. Most test frequencies are above 100Hz, while the transformer no-load test needs to be carried out at 50Hz. If the two tests are carried out separately, two sets of large equipment will be required to carry out the tests on site, which will consume a lot of time, manpower and funds. Summary of the invention

[0004] Based on this, it is necessary to propose a transformer no-load loss detection method, system and medium based on partial discharge test to address the above problems.

[0005] A transformer no-load loss detection method based on partial discharge test, the method comprising:

[0006] The partial discharge no-load loss of the transformer is obtained through the partial discharge test of the transformer.

[0007] The theoretical value of the transformer no-load loss at different frequencies is determined according to the partial discharge no-load loss.

[0008] The transformer loss is tested at different frequencies through the transformer factory test to obtain the measured values ​​of the transformer no-load loss at different frequencies.

[0009] According to the comparison between the theoretical value of the transformer no-load loss and the measured value of the transformer no-load loss at a preset frequency, an equivalent relationship database between the no-load loss and the partial discharge no-load loss at different frequencies is established.

[0010] The transformer no-load loss detection is performed based on the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the no-load loss data threshold.

[0011] Wherein, determining the theoretical value of the transformer no-load loss at different test frequencies according to the partial discharge no-load loss specifically includes:

[0012] according to Determine the theoretical value of the transformer no-load loss at different frequencies, where P is the partial discharge no-load loss, P0 is the theoretical value of the transformer no-load loss, fn is the rated frequency of 50Hz, K is the induced withstand voltage multiple, fs is the frequency during the test, m is the first empirical coefficient, and n is the second empirical coefficient.

[0013] Among them, the equivalent relationship database of no-load loss and partial discharge no-load loss at different frequencies is established according to the comparison between the theoretical value of the transformer no-load loss and the measured value of the transformer no-load loss at a preset frequency, specifically including:

[0014] It is determined whether the theoretical value of the transformer no-load loss at the current frequency is greater than the measured value of the transformer no-load loss at the preset frequency.

[0015] If it is determined that the theoretical value of the transformer no-load loss at the current frequency is greater than the measured value of the transformer no-load loss at the preset frequency, the empirical coefficient of the theoretical value of the transformer no-load loss is corrected by data fitting, and a database of equivalent relationships between the no-load loss and the partial discharge no-load loss at different frequencies is established.

[0016] It is determined that the theoretical value of the transformer no-load loss at the current frequency is not greater than the measured value of the transformer no-load loss at the preset frequency, and then an equivalent relationship database of no-load loss and partial discharge no-load loss at different frequencies is established through the measured value of the no-load loss.

[0017] The transformer no-load loss detection is performed according to the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the no-load loss data threshold, specifically including:

[0018] If the transformer is a single-phase transformer, the no-load loss data threshold is the nameplate data and the three-phase test data, and the transformer no-load loss detection is performed based on the comparison of the measured value of the transformer no-load loss in the equivalent relationship database with the nameplate data and the three-phase test data.

[0019] If the transformer is a three-phase transformer, the no-load loss data threshold is the preset no-load loss data, and the transformer no-load loss detection is performed based on the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the preset no-load loss data.

[0020] If the transformer is a single-phase transformer, the no-load loss data threshold is the nameplate data and the three-phase test data. The transformer no-load loss detection is performed according to the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the nameplate data and the three-phase test data, specifically including:

[0021] If the transformer is a single-phase transformer, it is determined whether the deviation between the measured value of the transformer no-load loss in the equivalent relationship database and the nameplate data or the three-phase test data is within a preset range.

[0022] It is determined that the deviation between the no-load loss measurement value and the nameplate data is within a preset range, and the deviation between the no-load loss measurement value and the three-phase test data is within a preset range, then the no-load loss of the transformer is normal.

[0023] If it is determined that the deviation between the no-load loss measurement value and the nameplate data is not within a preset range, or the deviation between the no-load loss measurement value and the three-phase test data is not within a preset range, then the no-load loss of the transformer is abnormal.

[0024] Wherein, if the transformer is a three-phase transformer, the no-load loss data threshold is the preset no-load loss data, and the transformer no-load loss detection is performed according to the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the preset no-load loss data, specifically including:

[0025] If the transformer is a three-phase transformer, it is determined whether the measured value of the transformer no-load loss in the equivalent relationship database is equal to the preset no-load loss data.

[0026] It is determined that the measured value of the transformer no-load loss in the equivalent relationship database is equal to the preset no-load loss data, and the transformer no-load loss is normal.

[0027] If the measured value of the transformer no-load loss in the equivalent relationship database is determined to be not equal to the preset no-load loss data, then the transformer no-load loss is abnormal.

[0028] Wherein, the step of determining that the measured value of the transformer no-load loss in the equivalent relationship database is equal to the preset no-load loss data, and the transformer no-load loss is normal, specifically includes:

[0029] Sure The transformer no-load loss is normal, where P 0ac is the measured value of the no-load loss of the AC phase transformer, P oab is the measured value of the no-load loss of the AB phase transformer, P obc is the measured value of the no-load loss of the BC phase transformer, k is the preset no-load loss data, k>1.

[0030] Wherein, if the measured value of the transformer no-load loss in the equivalent relationship database is determined to be not equal to the preset no-load loss data, then the transformer no-load loss is abnormal, specifically including:

[0031] Sure or The transformer no-load loss is abnormal, where P 0ac is the measured value of the no-load loss of the AC phase transformer, Poab is the measured value of the no-load loss of the AB phase transformer, P obc is the measured value of the no-load loss of the BC phase transformer, k is the preset no-load loss data, k>1.

[0032] The step of obtaining the partial discharge no-load loss of the transformer through the partial discharge test of the transformer specifically includes:

[0033] Monitor the partial discharge phenomenon inside the transformer by applying partial discharge excitation voltage to the transformer;

[0034] When the partial discharge excitation voltage drops to the partial discharge measurement test voltage, the partial discharge no-load loss of the transformer is obtained.

[0035] A transformer no-load loss detection system based on partial discharge test, the system comprising:

[0036] The partial discharge no-load loss acquisition module is used to obtain the partial discharge no-load loss of the transformer through the transformer partial discharge test.

[0037] The module for obtaining the theoretical value of transformer no-load loss is used to determine the theoretical value of transformer no-load loss at different frequencies according to the partial discharge no-load loss.

[0038] The transformer no-load loss measurement value acquisition module is used to perform loss tests on the transformer at different frequencies through the transformer factory test to obtain the measured values ​​of the transformer no-load loss at different frequencies.

[0039] The equivalent relationship database establishment module is used to establish an equivalent relationship database of no-load loss and partial discharge no-load loss at different frequencies based on the comparison between the theoretical value of the transformer no-load loss and the measured value of the transformer no-load loss at a preset frequency.

[0040] The transformer no-load loss detection module is used to perform transformer no-load loss detection based on the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the no-load loss data threshold.

[0041] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor executes the steps of the method described above.

[0042] The embodiments of the present invention have the following beneficial effects:

[0043] The present invention combines the partial discharge test of the transformer with the real-time online monitoring equipment status, and can timely and accurately discover the insulation defects and potential hidden dangers inside the transformer, and obtain the partial discharge no-load loss data through the test. The theoretical value of the transformer no-load loss is compared with the measured value of the no-load loss at the preset frequency of the transformer to find the deviation in actual operation, so as to perform data fitting correction on the empirical coefficient of the theoretical value of the transformer no-load loss, and establish an equivalent relationship database between the no-load loss and the partial discharge no-load loss at different frequencies, so as to provide data support for the no-load loss detection of the transformer. Furthermore, by comparing the measured value of the transformer no-load loss with the no-load loss data threshold to detect the no-load loss of the transformer, the abnormal situation of the transformer no-load loss is discovered in time, which helps to take measures for maintenance or repair in time to prevent the occurrence and expansion of faults.

[0044] In summary, the present invention detects the no-load loss of the transformer while carrying out the partial discharge test, and the loss of the transformer core is related to the frequency. Therefore, the core performance of the transformer is tested while detecting the insulation performance of the transformer, thereby saving time, manpower and financial losses in on-site tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] in:

[0047] Figure 1 A schematic flow chart of an embodiment of a transformer no-load loss detection method based on partial discharge test provided by the present invention;

[0048] Figure 2 A schematic flow chart of another embodiment of a transformer no-load loss detection method based on partial discharge test provided by the present invention;

[0049] Figure 3 A schematic flow chart of another embodiment of a transformer no-load loss detection method based on partial discharge test provided by the present invention;

[0050] Figure 4 It is a structural schematic diagram of an embodiment of a transformer no-load loss detection system based on partial discharge test;

[0051] Figure 5 A schematic structural diagram of an embodiment of the medium provided by the present invention. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] like Figure 1 As shown, Figure 1 A flow chart of an embodiment of a transformer no-load loss detection method based on partial discharge test provided by the present invention. The transformer no-load loss detection method based on partial discharge test comprises:

[0054] S101: Obtain the partial discharge no-load loss of the transformer through a partial discharge test of the transformer.

[0055] Exemplarily, partial discharge phenomena inside the transformer are monitored by applying a partial discharge excitation voltage to the transformer, and when the partial discharge excitation voltage drops to the partial discharge measurement test voltage, the partial discharge no-load loss of the transformer is obtained.

[0056] S102: Determine theoretical values ​​of transformer no-load losses at different frequencies based on partial discharge no-load losses.

[0057] Exemplarily, the theoretical value of the transformer no-load loss at different frequencies is determined according to the following formula:

[0058]

[0059] Among them, P is the no-load loss of partial discharge, P0 is the theoretical value of the no-load loss of the transformer, and f n is the rated frequency 50Hz, K is the inductive withstand voltage multiple, f s is the frequency of the test, m is the first empirical coefficient, and n is the second empirical coefficient.

[0060] S103: Performing a loss test on the transformer at different frequencies through a factory test of the transformer to obtain measurement values ​​of the transformer no-load loss at different frequencies.

[0061] For example, loss tests of multiple transformers at different frequencies are carried out in combination with the factory test of the transformer. Specifically, first, according to the test requirements, the frequency range to be tested is determined, such as 50Hz, 60Hz or other specific frequencies. During the test, the required test frequency is applied to the transformer, and the measured value of the no-load loss of the transformer is measured and recorded. The no-load loss measurement value of the transformer at different frequencies is obtained by changing the test frequency.

[0062] S104: Establishing an equivalent relationship database between no-load loss and partial discharge no-load loss at different frequencies according to a comparison between a theoretical value of no-load loss of the transformer and a measured value of no-load loss of the transformer at a preset frequency.

[0063] Exemplarily, it is determined whether the theoretical value of the transformer no-load loss at the current frequency is greater than the measured value of the transformer no-load loss at the preset frequency; if it is determined that the theoretical value of the transformer no-load loss at the current frequency is greater than the measured value of the transformer no-load loss at the preset frequency, the empirical coefficient of the theoretical value of the transformer no-load loss is corrected by data fitting, and a database of equivalent relationships between no-load losses and partial discharge no-load losses at different frequencies is established; if it is determined that the theoretical value of the transformer no-load loss at the current frequency is not greater than the measured value of the transformer no-load loss at the preset frequency, a database of equivalent relationships between no-load losses and partial discharge no-load losses at different frequencies is established through the measured value of the no-load loss.

[0064] S105: Perform transformer no-load loss detection according to the comparison between the measured value of transformer no-load loss and the no-load loss data threshold in the database of equivalent relationship between no-load loss and partial discharge no-load loss at different frequencies.

[0065] Exemplarily, if the transformer is a single-phase transformer, the no-load loss data threshold is the nameplate data and the three-phase test data, and the transformer no-load loss detection is performed according to the comparison of the measured value of the transformer no-load loss in the equivalent relationship database with the nameplate data and the three-phase test data. Specifically, if the transformer is a single-phase transformer, it is determined whether the deviation between the measured value of the transformer no-load loss in the equivalent relationship database and the nameplate data or the three-phase test data is within a preset range; if it is determined that the deviation between the no-load loss measurement value and the nameplate data is within a preset range, and the deviation between the no-load loss measurement value and the three-phase test data is within a preset range, then the transformer no-load loss is normal; if it is determined that the deviation between the no-load loss measurement value and the nameplate data is not within a preset range, or the deviation between the no-load loss measurement value and the three-phase test data is not within a preset range, then the transformer no-load loss is abnormal.

[0066] If the transformer is a three-phase transformer, the no-load loss data threshold is the preset no-load loss data, and the transformer no-load loss detection is performed according to the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the preset no-load loss data. Specifically, if the transformer is a three-phase transformer, it is determined whether the measured value of the transformer no-load loss in the equivalent relationship database is equal to the preset no-load loss data; if it is determined that the measured value of the transformer no-load loss in the equivalent relationship database is equal to the preset no-load loss data, the transformer no-load loss is normal; if it is determined that the measured value of the transformer no-load loss in the equivalent relationship database is not equal to the preset no-load loss data, the transformer no-load loss is abnormal.

[0067] It can be known from the above description that the present invention combines the real-time online monitoring equipment status of the transformer partial discharge test, can timely and accurately discover the insulation defects and potential hidden dangers inside the transformer, and obtain the partial discharge no-load loss data through the test. The theoretical value of the transformer no-load loss is compared with the measured value of the no-load loss at the preset frequency of the transformer, and the deviation in actual operation is found, so as to perform data fitting correction on the empirical coefficient of the theoretical value of the transformer no-load loss, and establish an equivalent relationship database between the no-load loss and the partial discharge no-load loss at different frequencies, so as to provide data support for the no-load loss detection of the transformer. Furthermore, by comparing the measured value of the transformer no-load loss with the no-load loss data threshold to detect the no-load loss of the transformer, the abnormal situation of the transformer no-load loss is discovered in time, which helps to take measures for maintenance or repair in time to prevent the occurrence and expansion of faults.

[0068] In summary, the present invention detects the no-load loss of the transformer while carrying out the partial discharge test, and the loss of the transformer core is related to the frequency. Therefore, the core performance of the transformer is tested while detecting the insulation performance of the transformer, thereby saving time, manpower and financial losses in on-site tests.

[0069] like Figure 2 As shown, Figure 2 A flow chart of another embodiment of a transformer no-load loss detection method based on partial discharge test provided by the present invention. The transformer no-load loss detection method based on partial discharge test comprises:

[0070] S201: Monitor the partial discharge phenomenon inside the transformer by applying a partial discharge excitation voltage to the transformer.

[0071] S202: When the partial discharge excitation voltage drops to the partial discharge measurement test voltage, the partial discharge no-load loss of the transformer is obtained.

[0072] It should be noted that steps S201-S202 are Figure 1 This has been discussed in detail in the implementation scenario shown and will not be repeated here.

[0073] S203: Determine theoretical values ​​of transformer no-load losses at different frequencies based on the partial discharge no-load losses.

[0074] Exemplarily, the transformer no-load loss P0 is calculated based on the measured partial discharge no-load loss and the calculation formula of the relationship between transformer loss and frequency,

[0075] P=(fs / fn) m ×(Kfn / fs) n ×P0;

[0076] Among them, P is the no-load loss of partial discharge, P0 is the theoretical value of the no-load loss of the transformer, and f nis the rated frequency 50Hz, K is the inductive withstand voltage multiple, f s is the test frequency, m is, n is, and K is the induced withstand voltage multiple.

[0077] The theoretical value of transformer no-load loss at different frequencies is determined according to the following formula:

[0078]

[0079] Among them, P is the partial discharge no-load loss, P0 is the theoretical value of the transformer no-load loss, fn is the rated frequency of 50Hz, K is the induced withstand voltage multiple, which is generally 1.58 times according to the current national standard algorithm, fs is the frequency during the test, m is the first empirical coefficient, and n is the second empirical coefficient.

[0080] S204: Performing a loss test on the transformer at different frequencies through a factory test of the transformer to obtain measured values ​​of no-load loss of the transformer at different frequencies.

[0081] It should be noted that step S204 Figure 1 This has been discussed in detail in the implementation scenario shown and will not be repeated here.

[0082] S205: Determine whether the theoretical value of the transformer no-load loss at the current frequency is greater than the measured value of the transformer no-load loss at the preset frequency.

[0083] S2051: If it is determined that the theoretical value of the transformer no-load loss at the current frequency is greater than the measured value of the transformer no-load loss at the preset frequency, a data fitting correction is performed on the empirical coefficient of the theoretical value of the transformer no-load loss, and an equivalent relationship database between the no-load loss and the partial discharge no-load loss at different frequencies is established.

[0084] Exemplarily, if it is determined that the theoretical value of the transformer no-load loss at the current frequency is greater than the measured value of the transformer no-load loss at 50 Hz in the factory test, the empirical coefficients m and n of the theoretical value of the transformer no-load loss are corrected by data fitting, and a database of equivalent relationships between no-load loss and partial discharge no-load loss at different frequencies is established.

[0085] S2052: Determine that the theoretical value of the transformer no-load loss at the current frequency is not greater than the measured value of the transformer no-load loss at the preset frequency, then establish an equivalent relationship database between the no-load loss and the partial discharge no-load loss at different frequencies through the measured value of the no-load loss.

[0086] Exemplarily, it is determined that the theoretical value of the transformer no-load loss at the current frequency is not greater than the measured value of the transformer no-load loss at 50 Hz in the factory test, and then a database of equivalent relationships between the no-load loss and the partial discharge no-load loss at different frequencies is established through the measured value of the no-load loss.

[0087] S206: If the transformer is a single-phase transformer, the no-load loss data threshold is the nameplate data and the three-phase test data, and the transformer no-load loss detection is performed based on the comparison of the measured value of the transformer no-load loss in the equivalent relationship database with the nameplate data and the three-phase test data.

[0088] Exemplarily, if the transformer is a single-phase transformer, determine whether the deviation between the measured value of the transformer no-load loss in the equivalent relationship database and the nameplate data or the three-phase test data is within a preset range; if it is determined that the deviation between the no-load loss measurement value and the nameplate data is within the preset range, and the deviation between the no-load loss measurement value and the three-phase test data is within the preset range, then the transformer no-load loss is normal; if it is determined that the deviation between the no-load loss measurement value and the nameplate data is not within the preset range, or the deviation between the no-load loss measurement value and the three-phase test data is not within the preset range, then the transformer no-load loss is abnormal.

[0089] S207: If the transformer is a three-phase transformer, the no-load loss data threshold is the preset no-load loss data, and the transformer no-load loss detection is performed based on the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the preset no-load loss data.

[0090] Exemplarily, if the transformer is a three-phase transformer, determine whether the measured value of the transformer no-load loss in the equivalent relationship database is equal to the preset no-load loss data; if it is determined that the measured value of the transformer no-load loss in the equivalent relationship database is equal to the preset no-load loss data, then the transformer no-load loss is normal; if it is determined that the measured value of the transformer no-load loss in the equivalent relationship database is not equal to the preset no-load loss data, then the transformer no-load loss is abnormal.

[0091] like Figure 3 As shown, Figure 3 A flow chart of another embodiment of a transformer no-load loss detection method based on partial discharge test provided by the present invention. The transformer no-load loss detection method based on partial discharge test comprises:

[0092] S301: Establishing an equivalent relationship database between no-load loss and partial discharge no-load loss at different frequencies based on a comparison between a theoretical value of no-load loss of the transformer and a measured value of no-load loss of the transformer at a preset frequency.

[0093] S302: If the transformer is a single-phase transformer, determine whether the deviation between the measured value of the transformer no-load loss in the equivalent relationship database and the nameplate data or the three-phase test data is within a preset range.

[0094] S3021: Determine that the deviation between the no-load loss measurement value and the nameplate data is within a preset range, and the deviation between the no-load loss measurement value and the three-phase test data is within a preset range, then the transformer no-load loss is normal.

[0095] Exemplarily, the equivalent relationship database is used to compare the transformer no-load loss measurement value calculated by the transformer factory test with the nameplate data. If the deviation is within 5%, and the deviation between the transformer no-load loss measurement value and the three-phase test data is also within 5%, then the transformer no-load loss is normal.

[0096] S3022: If it is determined that the deviation between the no-load loss measurement value and the nameplate data is not within a preset range, or the deviation between the no-load loss measurement value and the three-phase test data is not within a preset range, then the transformer no-load loss is abnormal.

[0097] Exemplarily, the equivalent relationship database is used to compare the transformer no-load loss measurement value calculated by the transformer factory test with the nameplate data. If the deviation is not within 5%, or the deviation between the transformer no-load loss measurement value and the three-phase test data is not within 5%, the transformer no-load loss is abnormal.

[0098] S303: If the transformer is a three-phase transformer, determine whether the measured value of the transformer no-load loss in the equivalent relationship database is equal to the preset no-load loss data.

[0099] S3031: Determine that the measured value of the transformer no-load loss in the equivalent relationship database is equal to the preset no-load loss data, then the transformer no-load loss is normal.

[0100] For example, determining The transformer no-load loss is normal, where P 0ac is the measured value of the no-load loss of the AC phase transformer, P oab is the measured value of the no-load loss of the AB phase transformer, P obc is the measured value of the no-load loss of the BC phase transformer, k is the preset no-load loss data, k>1.

[0101] S3032: If it is determined that the measured value of the transformer no-load loss in the equivalent relationship database is not equal to the preset no-load loss data, then the transformer no-load loss is abnormal.

[0102] For example, determining or The transformer no-load loss is abnormal, where P 0ac is the measured value of the no-load loss of the AC phase transformer, P oab is the measured value of the no-load loss of the AB phase transformer, P obc is the measured value of the no-load loss of the BC phase transformer, k is the preset no-load loss data, k>1.

[0103] like Figure 4 As shown, Figure 4The structure diagram of an embodiment of a transformer no-load loss detection system based on partial discharge test is shown in FIG. A transformer no-load loss detection system 10 based on partial discharge test includes:

[0104] The partial discharge no-load loss acquisition module 11 is used to acquire the partial discharge no-load loss of the transformer through a partial discharge test of the transformer.

[0105] The transformer no-load loss theoretical value acquisition module 12 is used to determine the transformer no-load loss theoretical value at different frequencies according to the partial discharge no-load loss.

[0106] The transformer no-load loss measurement value acquisition module 13 is used to perform loss tests on the transformer at different frequencies through the transformer factory test to obtain the transformer no-load loss measurement values ​​at different frequencies.

[0107] The equivalent relationship database establishment module 14 is used to establish an equivalent relationship database of no-load loss and partial discharge no-load loss at different frequencies based on the comparison between the theoretical value of the transformer no-load loss and the measured value of the transformer no-load loss at a preset frequency.

[0108] The transformer no-load loss detection module 15 is used to detect the transformer no-load loss according to the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the no-load loss data threshold.

[0109] Exemplarily, in the partial discharge no-load loss acquisition module 11, the partial discharge phenomenon inside the transformer is monitored by applying a partial discharge excitation voltage to the transformer; when the partial discharge excitation voltage drops to the partial discharge measurement test voltage, the partial discharge no-load loss of the transformer is obtained. In the transformer no-load loss theoretical value acquisition module 12, the theoretical value of the transformer no-load loss at different frequencies is determined according to the partial discharge no-load loss. In the transformer no-load loss measurement value acquisition module 13, the transformer is tested for loss at different frequencies through the transformer factory test, and the measured value of the transformer no-load loss at different frequencies is obtained. In the equivalent relationship database establishment module 14, it is determined whether the theoretical value of the transformer no-load loss at the current frequency is greater than the measured value of the transformer no-load loss at the preset frequency; if it is determined that the theoretical value of the transformer no-load loss at the current frequency is greater than the measured value of the transformer no-load loss at the preset frequency, the empirical coefficient of the theoretical value of the transformer no-load loss is corrected by data fitting, and an equivalent relationship database of no-load loss and partial discharge no-load loss at different frequencies is established; if it is determined that the theoretical value of the transformer no-load loss at the current frequency is not greater than the measured value of the transformer no-load loss at the preset frequency, an equivalent relationship database of no-load loss and partial discharge no-load loss at different frequencies is established through the measured value of the no-load loss. In the transformer no-load loss detection module 15, if the transformer is a single-phase transformer, the no-load loss data threshold is the nameplate data and the three-phase test data, and the transformer no-load loss detection is performed based on the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the nameplate data and the three-phase test data; if the transformer is a three-phase transformer, the no-load loss data threshold is the preset no-load loss data, and the transformer no-load loss detection is performed based on the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the preset no-load loss data.

[0110] like Figure 5 As shown, Figure 5 The structure diagram of an embodiment of the medium provided by the present invention is shown in FIG. The medium 20 stores at least one computer program 21, which is executed by a processor to implement the following Figure 1-Figure 3 In one embodiment, the medium 20 may be a storage chip, a hard disk, a mobile hard disk, a USB flash drive, an optical disk, or other readable and writable storage tools, or a server, etc.

[0111] Additionally, the processes depicted in the figures do not necessarily have to be performed in the particular order shown or in sequential order to achieve desired results. In certain implementations, multitasking and parallel processing are also possible or may be advantageous.

[0112] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer-readable storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0113] The apparatus, device, non-volatile computer-readable storage medium and method provided in the embodiments of this specification correspond to each other, and therefore, the apparatus, device, and non-volatile computer storage medium also have similar beneficial technical effects as the corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the corresponding apparatus, device, and non-volatile computer storage medium will not be repeated here.

[0114] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0115] For the convenience of description, the above device is described by being divided into various units according to their functions and described separately. Of course, when implementing this specification, the functions of each unit can be implemented in one or more software and / or hardware. It should be understood by those skilled in the art that this specification embodiment can be provided as a method, system, or computer program product. Therefore, this specification embodiment can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this specification embodiment can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0116] This specification is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of this specification. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0117] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0118] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0119] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0120] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0121] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0122] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0123] This specification may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. This specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0124] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0125] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A transformer no-load loss detection method based on partial discharge test, characterized in that: The method comprises: Obtain the partial discharge no-load loss of the transformer through the partial discharge test of the transformer; Determine theoretical values ​​of transformer no-load losses at different frequencies according to the partial discharge no-load losses; Through the transformer factory test, the transformer loss is tested at different frequencies to obtain the measured values ​​of the transformer no-load loss at different frequencies; Establishing an equivalent relationship database between no-load loss and partial discharge no-load loss at different frequencies according to the comparison between the theoretical value of no-load loss of the transformer and the measured value of no-load loss of the transformer at a preset frequency; The transformer no-load loss detection is performed based on the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the no-load loss data threshold.

2. A transformer no-load loss detection method based on partial discharge test according to claim 1, characterized in that: Determining the theoretical value of the transformer no-load loss at different test frequencies according to the partial discharge no-load loss specifically includes: according to Determine the theoretical value of the transformer no-load loss at different frequencies, where P is the partial discharge no-load loss, P0 is the theoretical value of the transformer no-load loss, fn is the rated frequency of 50Hz, K is the induced withstand voltage multiple, fs is the frequency during the test, m is the first empirical coefficient, and n is the second empirical coefficient.

3. A transformer no-load loss detection method based on partial discharge test according to claim 2, characterized in that: The method of establishing an equivalent relationship database between no-load loss and partial discharge no-load loss at different frequencies based on the comparison between the theoretical value of the transformer no-load loss and the measured value of the transformer no-load loss at a preset frequency specifically includes: Determine whether the theoretical value of the transformer no-load loss at the current frequency is greater than the measured value of the transformer no-load loss at the preset frequency; If it is determined that the theoretical value of the transformer no-load loss at the current frequency is greater than the measured value of the transformer no-load loss at the preset frequency, data fitting correction is performed on the empirical coefficient of the theoretical value of the transformer no-load loss, and an equivalent relationship database between the no-load loss and the partial discharge no-load loss at different frequencies is established; It is determined that the theoretical value of the transformer no-load loss at the current frequency is not greater than the measured value of the transformer no-load loss at the preset frequency, and then an equivalent relationship database of no-load loss and partial discharge no-load loss at different frequencies is established through the measured value of the no-load loss.

4. A transformer no-load loss detection method based on partial discharge test according to claim 3, characterized in that: The transformer no-load loss detection is performed according to the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the no-load loss data threshold, specifically including: If the transformer is a single-phase transformer, the no-load loss data threshold is the nameplate data and the three-phase test data, and the transformer no-load loss detection is performed according to the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the nameplate data and the three-phase test data; If the transformer is a three-phase transformer, the no-load loss data threshold is the preset no-load loss data, and the transformer no-load loss detection is performed based on the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the preset no-load loss data.

5. A transformer no-load loss detection method based on partial discharge test according to claim 4, characterized in that: If the transformer is a single-phase transformer, the no-load loss data threshold is the nameplate data and the three-phase test data. The transformer no-load loss detection is performed according to the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the nameplate data and the three-phase test data, specifically including: If the transformer is a single-phase transformer, determining whether the deviation between the measured value of the transformer no-load loss in the equivalent relationship database and the nameplate data or the three-phase test data is within a preset range; Determine that the deviation between the no-load loss measurement value and the nameplate data is within a preset range, and the deviation between the no-load loss measurement value and the three-phase test data is within a preset range, then the transformer no-load loss is normal; If it is determined that the deviation between the no-load loss measurement value and the nameplate data is not within a preset range, or the deviation between the no-load loss measurement value and the three-phase test data is not within a preset range, then the no-load loss of the transformer is abnormal.

6. A transformer no-load loss detection method based on partial discharge test according to claim 4, characterized in that: If the transformer is a three-phase transformer, the no-load loss data threshold is the preset no-load loss data, and the transformer no-load loss detection is performed according to the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the preset no-load loss data, specifically including: If the transformer is a three-phase transformer, determining whether the measured value of the transformer no-load loss in the equivalent relationship database is equal to the preset no-load loss data; Determine that the measured value of the transformer no-load loss in the equivalent relationship database is equal to the preset no-load loss data, then the transformer no-load loss is normal; If the measured value of the transformer no-load loss in the equivalent relationship database is determined to be not equal to the preset no-load loss data, then the transformer no-load loss is abnormal.

7. A transformer no-load loss detection method based on partial discharge test according to claim 6, characterized in that: The determination that the measured value of the transformer no-load loss in the equivalent relationship database is equal to the preset no-load loss data, and the transformer no-load loss is normal, specifically includes: Sure The transformer no-load loss is normal, where P 0ac is the measured value of the no-load loss of the AC phase transformer, P oab is the measured value of the no-load loss of the AB phase transformer, P obc is the measured value of the no-load loss of the BC phase transformer, k is the preset no-load loss data, k>1.

8. A transformer no-load loss detection method based on partial discharge test according to claim 6, characterized in that: The determination that the measured value of the transformer no-load loss in the equivalent relationship database is not equal to the preset no-load loss data indicates that the transformer no-load loss is abnormal, specifically including: Sure or The transformer no-load loss is abnormal, where P 0ac is the measured value of the no-load loss of the AC phase transformer, P oab is the measured value of the no-load loss of the AB phase transformer, P obc is the measured value of the no-load loss of the BC phase transformer, k is the preset no-load loss data, k>1.

9. The transformer no-load loss detection method based on partial discharge test according to claim 1 is characterized in that: The method of obtaining the partial discharge no-load loss of the transformer through the partial discharge test of the transformer specifically includes: Monitor the partial discharge phenomenon inside the transformer by applying partial discharge excitation voltage to the transformer; When the partial discharge excitation voltage drops to the partial discharge measurement test voltage, the partial discharge no-load loss of the transformer is obtained.

10. A transformer no-load loss detection system based on partial discharge test, characterized in that: The system comprises: A partial discharge no-load loss acquisition module is used to acquire the partial discharge no-load loss of the transformer through a transformer partial discharge test; A transformer no-load loss theoretical value acquisition module, used to determine the theoretical value of the transformer no-load loss at different frequencies according to the partial discharge no-load loss; The transformer no-load loss measurement value acquisition module is used to perform loss tests on the transformer at different frequencies through the transformer factory test to obtain the measured values ​​of the transformer no-load loss at different frequencies; An equivalent relationship database establishment module is used to establish an equivalent relationship database of no-load loss and partial discharge no-load loss at different frequencies according to the comparison between the theoretical value of the transformer no-load loss and the measured value of the transformer no-load loss at a preset frequency; The transformer no-load loss detection module is used to perform transformer no-load loss detection based on the comparison between the measured value of the transformer no-load loss in the equivalent relationship database and the no-load loss data threshold.

11. A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 9.

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