Lead method for implementing partial discharge measurement type test of transformer in narrow space

Abstract

The application discloses a lead method for implementing transformer partial discharge measurement type test in a narrow space, a test system for implementing transformer partial discharge measurement type test in a narrow space, a storage medium and computer equipment. The method comprises the following steps: determining the highest test voltage of the pressurized side of a tested transformer based on the partial discharge measurement type test requirement of the tested transformer; determining a target high-voltage cable type matched with the highest test voltage from a plurality of preset high-voltage cable types, and determining the length of a high-voltage cable according to the distance between the tested transformer and a test device; selecting a test high-voltage cable according to the target high-voltage cable type and the length of the high-voltage cable, and connecting the test device and the tested transformer, so that the test device is used to perform partial discharge measurement type test on the tested transformer.

Description

Technical Field

[0001] This application relates to the field of transformer technology, and in particular to a lead wire method for conducting transformer partial discharge measurement tests in a confined space, a system for conducting transformer partial discharge measurement tests in a confined space, a storage medium, and a computer device. Background Technology

[0002] Transformer partial discharge measurement tests (including no-load tests, induced withstand voltage tests, applied withstand voltage tests, DC withstand voltage tests, etc.) are usually conducted at relatively high test voltages. Depending on the voltage level of the transformer under test and the test items, the test voltage on the applied side often reaches or even exceeds tens of kilovolts. During the test, a pressure-applying lead without high-voltage insulation capability is typically used to connect the test equipment and the transformer under test. Insulated ropes or rods are used as auxiliary supports at appropriate locations on the lead to ensure proper insulation distance. Summary of the Invention

[0003] In view of this, this application provides a lead wire method, a system, a storage medium, and a computer device for conducting transformer partial discharge measurement tests in confined spaces, applicable to various types of transformer partial discharge measurement tests. This method solves the problem of difficulty in ensuring the distance between the voltage lead wire and other objects due to limited space in transformer partial discharge measurement tests. This method also solves the problem of floating or tip discharge caused by complex environments in the vicinity of the voltage lead wire in transformer partial discharge measurement tests.

[0004] According to one aspect of this application, a lead wire method is provided for performing transformer partial discharge measurement tests in a confined space, the method comprising:

[0005] Obtain the partial discharge measurement test requirements for the transformer under test, and determine the maximum test voltage on the applied side of the transformer under test based on the partial discharge measurement test requirements;

[0006] Among multiple preset high-voltage cable types, a target high-voltage cable type matching the highest test voltage is determined, and the length of the high-voltage cable is determined based on the distance between the transformer under test and the test equipment.

[0007] Based on the type and length of the target high-voltage cable, a test high-voltage cable is selected, and the test equipment and the transformer under test are connected through the test high-voltage cable, so as to use the test equipment to perform partial discharge measurement tests on the transformer under test.

[0008] Optionally, connecting the test equipment and the transformer under test via the test high-voltage cable includes:

[0009] The test high-voltage cable is connected to the test equipment and the voltage-applied terminals of the transformer under test through its cable core, and voltage equalization measures are taken at the connection point.

[0010] Connect the metal shielding layer of the test high-voltage cable to the test ground, and take voltage equalization measures at the end of the shielding layer.

[0011] Optionally, determining the target high-voltage cable type that matches the highest test voltage from a plurality of preset high-voltage cable types includes:

[0012] The withstand voltage of the target cable is calculated based on the highest test voltage and the preset withstand voltage coefficient.

[0013] Based on the withstand voltage value of each preset high-voltage cable type, determine the candidate high-voltage cable types with withstand voltage values ​​greater than the target cable withstand voltage value;

[0014] Select the target high-voltage cable type from the candidate high-voltage cable types.

[0015] Optionally, the step of conducting a partial discharge measurement test on the transformer under test using the test equipment according to the partial discharge measurement test plan includes:

[0016] Calculate the equivalent capacitance value of the test high-voltage cable, and take the sum of the inlet capacitance value of the transformer under test and the equivalent capacitance value of the cable as the test capacitance value of the inlet capacitance.

[0017] The test parameters for the partial discharge measurement test are calculated using the test capacitance value.

[0018] Optionally, partial discharge measurement tests include at least one of the following: no-load test, induced withstand voltage test, applied withstand voltage test, and DC withstand voltage test.

[0019] Optionally, determining the highest test voltage on the applied side of the transformer under test based on the partial discharge measurement test requirements includes:

[0020] The test voltage for each test requirement in the partial discharge measurement test requirements is determined, and the maximum value among the test voltages of each test requirement is taken as the highest test voltage on the voltage-applied side of the transformer under test.

[0021] According to another aspect of this application, a lead wire device is provided for performing transformer partial discharge measurement tests in a confined space, the device comprising:

[0022] The lead-in module is used to acquire the partial discharge measurement test requirements of the transformer under test, and based on the partial discharge measurement test requirements, determine the highest test voltage on the voltage-applied side of the transformer under test; determine the target high-voltage cable type that matches the highest test voltage from multiple preset high-voltage cable types, and determine the high-voltage cable length according to the distance between the transformer under test and the test equipment; select a test high-voltage cable according to the target high-voltage cable type and the high-voltage cable length, and connect the test equipment and the transformer under test through the test high-voltage cable, so as to perform partial discharge measurement tests on the transformer under test using the test equipment.

[0023] Optionally, the lead module is used for:

[0024] The test high-voltage cable is connected to the test equipment and the voltage-applied terminals of the transformer under test through its cable core, and voltage equalization measures are taken at the connection point.

[0025] Connect the metal shielding layer of the test high-voltage cable to the test ground, and take voltage equalization measures at the end of the shielding layer.

[0026] Optionally, the lead module is used for:

[0027] The withstand voltage of the target cable is calculated based on the highest test voltage and the preset withstand voltage coefficient.

[0028] Based on the withstand voltage value of each preset high-voltage cable type, determine the candidate high-voltage cable types with withstand voltage values ​​greater than the target cable withstand voltage value;

[0029] Select the target high-voltage cable type from the candidate high-voltage cable types.

[0030] Optionally, the apparatus further includes: a testing module, used for:

[0031] Calculate the equivalent capacitance value of the test high-voltage cable, and take the sum of the inlet capacitance value of the transformer under test and the equivalent capacitance value of the cable as the test capacitance value of the inlet capacitance.

[0032] The test parameters for the partial discharge measurement test are calculated using the test capacitance value.

[0033] Optionally, partial discharge measurement tests include at least one of the following: no-load test, induced withstand voltage test, applied withstand voltage test, and DC withstand voltage test.

[0034] Optionally, the lead module is used for:

[0035] The test voltage for each test requirement in the partial discharge measurement test requirements is determined, and the maximum value among the test voltages of each test requirement is taken as the highest test voltage on the voltage-applied side of the transformer under test.

[0036] According to another aspect of this application, a test system for measuring partial discharge of transformers in a confined space is provided, comprising:

[0037] The test transformer, the test equipment, and the test high-voltage cable connecting the test transformer and the test equipment, wherein the test high-voltage cable between the test equipment and the test transformer is implemented by the lead wire method described above for performing transformer partial discharge measurement tests in a confined space.

[0038] According to another aspect of this application, a storage medium is provided that stores a computer program thereon, which, when executed by a processor, implements the above-described lead-wire method for performing transformer partial discharge measurement tests in a confined space.

[0039] According to another aspect of this application, a computer device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor executes the program to implement the above-described lead wire method for performing transformer partial discharge measurement tests in a confined space.

[0040] Using the above technical solution, this application provides a lead wire method, a system for conducting transformer partial discharge measurement tests in confined spaces, a storage medium, and computer equipment. Based on the transformer partial discharge measurement test scheme, the highest test voltage applied to the pressure side during the test is determined. A high-voltage cable with a voltage rating appropriate to the aforementioned highest test voltage is selected; typically, the cable's withstand voltage level should be 20% or more higher than the aforementioned highest test voltage. The cable length should be suitable for the transformer's on-site testing requirements, and a cable head should be provided. The overall partial discharge quantity is verified through partial discharge testing to meet the background requirements for transformer partial discharge measurement. The test equipment and the pressure terminals of the transformer under test are reliably connected through the cable core, and the cable's metal shielding layer is reliably connected to the test ground. Necessary voltage equalization measures are taken at the connection point. The equivalent capacitance of the cable is added when calculating the transformer's inlet capacitance, and test parameters are estimated. The test is completed using the same test equipment and methods as conventional transformer partial discharge measurement tests. The lead wire method proposed in this application is applicable to various types of transformer partial discharge measurement tests. This method can solve the problem of difficulty in ensuring the distance to other objects due to limited space for the pressure lead wire in transformer partial discharge measurement tests. This method can solve the problem of floating or tip discharge caused by the complex environment in the vicinity of the pressurized lead in transformer partial discharge measurement tests.

[0041] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0042] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0043] Figure 1 This paper illustrates a schematic flowchart of a lead wire method for conducting transformer partial discharge measurement tests in a confined space, according to an embodiment of this application.

[0044] Figure 2 This illustration shows a schematic diagram of a lead wire device for conducting transformer partial discharge measurement tests in a confined space, according to an embodiment of this application.

[0045] Figure 3 This illustration shows a structural schematic diagram of a transformer partial discharge measurement test system provided in an embodiment of this application.

[0046] Figure 4 A schematic diagram of the device structure of a computer device provided in an embodiment of this application is shown. Detailed Implementation

[0047] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0048] The inventors recognized several problems encountered during the implementation of transformer partial discharge measurement tests: First, limited space, such as transformer water spray pipes, firewalls, and transformer accessories like oil tanks, radiators, risers, and bushings, occupies necessary space, making it difficult to maintain the required test distance between the pressure lead and other objects. Excessive auxiliary support or excessively long pressure leads also increases test uncertainty and safety risks. Second, the pressure lead typically needs to cross the transformer body and its components, and numerous suspended objects may appear in the vicinity, requiring extensive investigation. Even with ultraviolet imaging, such discharges are difficult to detect. Third, the vicinity of the pressure lead is wide, containing many conductive sharp objects that could trigger corona discharge, especially during construction phases where some sharp objects are difficult to detect and handle. Therefore, a method for conducting transformer partial discharge measurement tests within confined spaces is urgently needed.

[0049] This application proposes a method for pressure-side lead wires based on shielded cables or insulated conduits, which can comprehensively solve problems such as limited space on the pressure side and induced interference.

[0050] This embodiment provides a lead wire method for conducting transformer partial discharge measurement tests in a confined space, such as... Figure 1 As shown, the method includes:

[0051] Step 101: Obtain the partial discharge measurement test requirements for the transformer under test, and determine the maximum test voltage on the voltage-applied side of the transformer under test based on the partial discharge measurement test requirements.

[0052] Optionally, partial discharge measurement tests include at least one of no-load test, induced withstand voltage test, applied withstand voltage test, and DC withstand voltage test. Determining the maximum test voltage on the applied side of the transformer under test based on the partial discharge measurement test requirements includes: determining the test voltage for each test requirement in the partial discharge measurement test requirements, and taking the maximum value among the test voltages of each test requirement as the maximum test voltage on the applied side of the transformer under test.

[0053] In this embodiment, the highest test voltage applied to the voltage-applied side during the test is determined according to the transformer partial discharge measurement test scheme. For the transformer under test, partial discharge measurement tests are performed as needed to determine the highest test voltage that needs to be applied to the voltage-applied side of the transformer under test. The partial discharge measurement tests include at least one of no-load test, induced withstand voltage test, externally applied withstand voltage test, and DC withstand voltage test. When determining the highest test voltage, it is necessary to determine the highest test voltage corresponding to each test requirement individually, and then take the maximum value as the overall highest test voltage for the partial discharge measurement tests.

[0054] Step 102: Determine the target high-voltage cable type that matches the highest test voltage from multiple preset high-voltage cable types, and determine the high-voltage cable length based on the distance between the transformer under test and the test equipment.

[0055] Optionally, determining the target high-voltage cable type that matches the highest test voltage from a plurality of preset high-voltage cable types includes: calculating the withstand voltage value of the target cable based on the highest test voltage and a preset withstand voltage strength coefficient; determining candidate high-voltage cable types with withstand voltage values ​​greater than the target cable withstand voltage value based on the withstand voltage value of each preset high-voltage cable type; and selecting the target high-voltage cable type from the candidate high-voltage cable types.

[0056] In this embodiment, a high-voltage cable with a voltage level appropriate to the aforementioned maximum test voltage is selected. Typically, the cable's withstand voltage should be 20% or more higher than the aforementioned maximum test voltage. After determining the maximum test voltage, to further ensure the safety of the cable and equipment during the test, the target cable withstand voltage value is calculated based on the maximum test voltage and a preset withstand voltage coefficient. For example, if the preset withstand voltage coefficient is 1.2, then the target cable withstand voltage value is 20% higher than the maximum test voltage. The target cable withstand voltage value = maximum test voltage * preset withstand voltage coefficient.

[0057] Optionally, before determining the target high-voltage cable type matching the highest test voltage from multiple preset high-voltage cable types, the method further includes: querying conductive objects within a preset range corresponding to the transformer under test, and determining the insulation requirements of the test high-voltage cable corresponding to the transformer under test based on the conductive objects; querying magnetic objects between the transformer under test and the test equipment, and determining the electromagnetic shielding requirements of the test high-voltage cable corresponding to the transformer under test based on the magnetic objects; and selecting a preset high-voltage cable type that simultaneously meets the insulation requirements and the electromagnetic shielding requirements based on the insulation performance and electromagnetic shielding performance of different high-voltage cable types.

[0058] Furthermore, this application embodiment selects high-voltage cables as the pressurization leads, utilizing their excellent insulation properties to solve the problem of ensuring the distance between the pressurization leads and other objects in transformer partial discharge measurement tests; and utilizing their excellent electromagnetic shielding properties to solve the problem of floating or tip discharge in the vicinity of the pressurization leads due to induction. Therefore, the insulation requirements for the test high-voltage cables can be determined first based on the conductivity of objects near the transformer under test, and the electromagnetic shielding requirements for the test high-voltage cables can be determined based on the magnetic objects between the transformer under test and the test equipment. Thus, the selection of high-voltage cables can be based on a combination of meeting both insulation and electromagnetic shielding requirements.

[0059] Step 103: Select a test high-voltage cable according to the type and length of the target high-voltage cable, and connect the test equipment and the transformer under test through the test high-voltage cable to perform partial discharge measurement tests on the transformer under test using the test equipment.

[0060] Optionally, connecting the test equipment and the transformer under test via the test high-voltage cable includes: connecting the test equipment and the transformer under test to the voltage-applied terminals via the cable core of the test high-voltage cable, and taking voltage equalization measures at the connection point; connecting the cable metal shielding layer of the test high-voltage cable to the test ground, and taking voltage equalization measures at the end of the shielding layer.

[0061] In this embodiment, the test equipment and the voltage terminals of the transformer under test are reliably connected through the cable core, the metal shielding layer of the cable is reliably connected to the test ground, and necessary voltage equalization measures are taken at the connection to ensure the reliability of the test.

[0062] Optionally, the partial discharge measurement test performed on the transformer under test using the test equipment includes: calculating the equivalent capacitance value of the cable corresponding to the test high-voltage cable, and using the sum of the inlet capacitance value of the transformer under test and the equivalent capacitance value of the cable as the test capacitance value of the inlet capacitance; and using the test capacitance value to calculate the test parameters for the partial discharge measurement test.

[0063] In this embodiment, the equivalent capacitance of the cable is added when calculating the transformer inlet capacitance to estimate test parameters. The test is completed using the same test equipment and methods as conventional transformer partial discharge measurement tests. This improves the accuracy of test parameters and enhances test reliability.

[0064] By applying the technical solution of this embodiment, the highest test voltage applied to the pressure side during the test is determined according to the requirements of transformer partial discharge measurement tests. Based on the aforementioned highest test voltage, a high-voltage cable with a voltage rating appropriate to it is selected; typically, the cable withstand voltage level should be 20% or more higher than the aforementioned highest test voltage. The cable length should be suitable for the transformer's on-site testing requirements, and a cable termination should be provided. The overall partial discharge quantity should be verified through partial discharge testing to meet the background requirements for transformer partial discharge measurement. The test equipment and the pressure terminals of the transformer under test are reliably connected through the cable core, and the cable's metallic shielding layer is reliably connected to the test ground. Necessary voltage equalization measures are taken at the connection point. The equivalent capacitance of the cable is added when calculating the transformer inlet capacitance, and test parameters are estimated. The test is completed using test equipment and methods consistent with conventional transformer partial discharge measurement tests.

[0065] The lead wire method proposed in this application is applicable to various transformer partial discharge measurement tests. This method can solve the problem of difficulty in ensuring the distance between the voltage lead wire and other objects due to limited space in transformer partial discharge measurement tests. This method can also solve the problem of floating or tip discharge caused by the complex environment near the voltage lead wire in transformer partial discharge measurement tests.

[0066] Furthermore, as Figure 1 In a specific implementation of the method, this application provides a lead wire device for conducting transformer partial discharge measurement tests in a confined space, such as... Figure 2 As shown, the device includes:

[0067] The lead-in module is used to acquire the partial discharge measurement test requirements of the transformer under test, and based on the partial discharge measurement test requirements, determine the highest test voltage on the voltage-applied side of the transformer under test; determine the target high-voltage cable type that matches the highest test voltage from multiple preset high-voltage cable types, and determine the high-voltage cable length according to the distance between the transformer under test and the test equipment; select a test high-voltage cable according to the target high-voltage cable type and the high-voltage cable length, and connect the test equipment and the transformer under test through the test high-voltage cable, so as to perform partial discharge measurement tests on the transformer under test using the test equipment.

[0068] Optionally, the lead module is used for:

[0069] The test high-voltage cable is connected to the test equipment and the voltage-applied terminals of the transformer under test through its cable core, and voltage equalization measures are taken at the connection point.

[0070] Connect the metal shielding layer of the test high-voltage cable to the test ground, and take voltage equalization measures at the end of the shielding layer.

[0071] Optionally, the lead module is used for:

[0072] The withstand voltage of the target cable is calculated based on the highest test voltage and the preset withstand voltage coefficient.

[0073] Based on the withstand voltage value of each preset high-voltage cable type, determine the candidate high-voltage cable types with withstand voltage values ​​greater than the target cable withstand voltage value;

[0074] Select the target high-voltage cable type from the candidate high-voltage cable types.

[0075] Optionally, the apparatus further includes: a testing module, used for:

[0076] Calculate the equivalent capacitance value of the test high-voltage cable, and take the sum of the inlet capacitance value of the transformer under test and the equivalent capacitance value of the cable as the test capacitance value of the inlet capacitance.

[0077] The test parameters for the partial discharge measurement test are calculated using the test capacitance value.

[0078] Optionally, partial discharge measurement tests include at least one of the following: no-load test, induced withstand voltage test, applied withstand voltage test, and DC withstand voltage test.

[0079] Optionally, the lead module is used for:

[0080] The test voltage for each test requirement in the partial discharge measurement test requirements is determined, and the maximum value among the test voltages of each test requirement is taken as the highest test voltage on the voltage-applied side of the transformer under test.

[0081] Optionally, the lead module is used for:

[0082] Query the conductive objects within a preset range corresponding to the transformer under test, and determine the insulation requirements of the test high-voltage cable corresponding to the transformer under test based on the conductive objects;

[0083] Query the magnetic objects between the transformer under test and the test equipment, and determine the electromagnetic shielding requirements of the test high-voltage cable corresponding to the transformer under test based on the magnetic objects;

[0084] Based on the insulation and electromagnetic shielding performance of different types of high-voltage cables, a preset type of high-voltage cable that meets both the insulation and electromagnetic shielding requirements is selected.

[0085] It should be noted that other corresponding descriptions of the functional units involved in the lead wire device for conducting transformer partial discharge measurement tests in a confined space provided in the embodiments of this application can be found in the following references. Figure 1 The corresponding descriptions in the method will not be repeated here.

[0086] According to another aspect of this application, a system for performing transformer partial discharge measurement tests in a confined space is provided, such as... Figure 3 As shown, it includes: a transformer under test, a test device, and a test high-voltage cable connecting the transformer under test and the test device, wherein the test high-voltage cable between the test device and the transformer under test is implemented by the lead wire method described above for performing transformer partial discharge measurement tests in a confined space.

[0087] This application also provides a computer device, which may specifically be a personal computer, a server, a network device, etc. Figure 4 As shown, the computer device includes a bus, a processor, memory, and a communication interface, and may also include an input / output interface and a display device. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores location information. The network interface allows communication with external terminals via a network connection. When the computer program is executed by the processor, it implements the steps in the various method embodiments.

[0088] Those skilled in the art will understand that Figure 4 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0089] In one embodiment, a computer-readable storage medium is provided, which may be non-volatile or volatile, having stored thereon a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0090] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0091] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0092] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0093] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A lead wire method for conducting transformer partial discharge measurement tests in a confined space, characterized in that, The method includes: Obtain the partial discharge measurement test requirements for the transformer under test, and determine the maximum test voltage on the applied side of the transformer under test based on the partial discharge measurement test requirements; Determining a target high-voltage cable type that matches the highest test voltage from multiple preset high-voltage cable types includes: calculating the withstand voltage value of the target cable based on the highest test voltage and a preset withstand voltage strength coefficient; determining candidate high-voltage cable types with withstand voltage values ​​greater than the target cable withstand voltage value based on the withstand voltage value of each preset high-voltage cable type; and selecting the target high-voltage cable type from the candidate high-voltage cable types. The length of the high-voltage cable is determined based on the distance between the transformer under test and the test equipment; Based on the type and length of the target high-voltage cable, a test high-voltage cable is selected, and the test equipment and the transformer under test are connected through the test high-voltage cable. Calculate the equivalent capacitance value of the test high-voltage cable, and use the sum of the inlet capacitance value of the transformer under test and the equivalent capacitance value of the cable as the test capacitance value of the inlet capacitance; use the test capacitance value to calculate the test parameters of the partial discharge measurement test.

2. The method according to claim 1, characterized in that, The connection between the test equipment and the transformer under test via the test high-voltage cable includes: The test high-voltage cable is connected to the test equipment and the voltage-applied terminals of the transformer under test through its cable core, and voltage equalization measures are taken at the connection point. Connect the metal shielding layer of the test high-voltage cable to the test ground, and take voltage equalization measures at the end of the shielding layer.

3. The method according to claim 1, characterized in that, The partial discharge measurement tests include at least one of the following: no-load test, induced withstand voltage test, applied withstand voltage test, and DC withstand voltage test.

4. The method according to claim 3, characterized in that, The determination of the highest test voltage on the applied side of the transformer under test based on the partial discharge measurement test requirements includes: The test voltage for each test requirement in the partial discharge measurement test requirements is determined, and the maximum value among the test voltages of each test requirement is taken as the highest test voltage on the voltage-applied side of the transformer under test.

5. A system for conducting transformer partial discharge measurement tests in a confined space, characterized in that, include: The test transformer, the test equipment, and the test high-voltage cable connecting the test transformer and the test equipment, wherein the test high-voltage cable between the test equipment and the test transformer is implemented by the lead wire method for performing transformer partial discharge measurement tests in a confined space as described in claims 1 to 4.

6. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 4.

7. A computer device, comprising a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method of any one of claims 1 to 4.

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