On-site ac voltage withstand test device and method for reactor

Abstract

A field AC withstand voltage test apparatus and method for reactors is disclosed. The apparatus includes: a frequency converter for adjusting the power supply frequency; an intermediate transformer for increasing the power supply voltage; a spatial corona coupling antenna for monitoring spatial coupling signals; a capacitive voltage divider for measuring whether the high-voltage side voltage meets the test requirements; a capacitor bank in the reactive power compensation area for providing capacitance compensation; a detection impedance for obtaining a first partial discharge signal from the high-voltage bushing of the oil-immersed shunt reactor under test; and a partial discharge measuring device for measuring the first partial discharge signal from the high-voltage bushing of the oil-immersed shunt reactor under test, and processing the measured first partial discharge signal according to the spatial coupling signal to obtain and output a second partial discharge signal. The field AC withstand voltage test apparatus and method for reactors provided by this invention improves test efficiency and reduces interference signals caused by line structure corona.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and more specifically, to a device and method for on-site AC withstand voltage testing of reactors. Background Technology

[0002] When oil-immersed reactors are used for low-voltage reactive power compensation in UHV substations, on-site AC withstand voltage partial discharge measurement tests are required to determine whether insulation defects exist during transportation and installation. However, UHV oil-immersed low-voltage reactive power compensation reactors have large capacities and high reactance values, placing extremely high demands on the testing equipment during on-site handover testing. A large number of capacitors are needed for compensation, and the high test current can easily damage the equipment, making the test difficult to conduct. Currently, on-site AC withstand voltage partial discharge measurement tests for oil-immersed UHV low-voltage reactive power compensation parallel reactors have not been conducted domestically or internationally, representing a technological gap. Summary of the Invention

[0003] In view of this, the present invention proposes a field AC withstand voltage test device and method for reactors, aiming to solve the problem that it is difficult to carry out field AC withstand voltage measurement and partial discharge test of oil-immersed UHV low-voltage reactive power compensation parallel reactors, and there is a technological gap.

[0004] In a first aspect, embodiments of the present invention provide a field AC withstand voltage test device for a reactor, comprising: a frequency converter for adjusting the power frequency of the field AC withstand voltage test device; an intermediate transformer for increasing the power voltage of the field AC withstand voltage test device; a spatial corona coupling antenna for monitoring the spatial coupling signal of the field AC withstand voltage test device and sending the monitored spatial coupling signal to a partial discharge measurement device; a capacitor divider for measuring whether the high-voltage side voltage of the field AC withstand voltage test device meets the test requirements; a reactive power compensation area capacitor bank for providing capacitance compensation for the field AC withstand voltage test device; and a detection impedance for obtaining a first partial discharge signal from the high-voltage bushing of the oil-immersed parallel reactor under test; and a partial discharge measurement device. A discharge measurement device is used to measure the first partial discharge signal of the high-voltage bushing of the oil-immersed shunt reactor under test, and to process the measured first partial discharge signal according to the spatial coupling signal to obtain and output a second partial discharge signal. The primary winding of the intermediate transformer is connected to the frequency converter, and one end of the secondary winding of the intermediate transformer is grounded, while the other end is connected to the oil-immersed shunt reactor under test. A capacitive voltage divider is connected in parallel with the reactive power compensation area capacitor bank; one end of the parallel connection is connected to the oil-immersed shunt reactor under test and its high-voltage bushing, while the other end is grounded. One end of the detection impedance is connected to the high-voltage bushing of the oil-immersed shunt reactor under test, and the other end is grounded. The partial discharge measurement device is connected to both the detection impedance and the spatial corona coupling antenna.

[0005] Furthermore, the reactor field AC withstand voltage test device also includes: a coupling corona signal conversion device, which is connected to the space corona coupling antenna and the partial discharge measurement device respectively, and is used to convert the space coupling signal monitored by the space corona coupling antenna and send it to the partial discharge measurement device.

[0006] Further, the measured first partial discharge signal is processed according to the spatial coupling signal, including: subtracting the spatial coupling signal from the measured first partial discharge signal.

[0007] Furthermore, the impedance detection is a component that uses the pulse current method to detect impedance, and the partial discharge measurement device is a partial discharge test measurement device that uses the pulse current method.

[0008] Secondly, embodiments of the present invention also provide a method for on-site AC withstand voltage testing of reactors, applied to the on-site AC withstand voltage testing apparatus for reactors provided in the above embodiments, comprising: acquiring the test voltage, the reactance value of the oil-immersed parallel reactor under test, and the capacitance value of each reactive power compensation zone capacitor in the reactive power compensation zone capacitor bank; obtaining the test frequency based on the reactance value and each capacitance value; determining whether the test frequency meets a first frequency range; if it does, proceeding to the next step; otherwise, selecting a portion of the reactive power compensation zone capacitors from the reactive power compensation zone capacitor bank as compensation capacitors, and returning to the previous step to recalculate the test frequency. Continue until the test frequency meets the first frequency range; obtain the measured system impedance, and obtain the test loop current based on the test voltage and system impedance; determine whether the test loop current meets the parameter requirements of the oil-immersed shunt reactor under test. If it does, complete the test setup, and perform AC withstand voltage and partial discharge measurement tests on the oil-immersed shunt reactor under test and its high-voltage bushing. Otherwise, reselect the reactive power compensation area capacitor from the reactive power compensation area capacitor bank as the compensation capacitor, and return to the test frequency calculation step until the test loop current meets the parameter requirements of the oil-immersed shunt reactor under test.

[0009] Further, based on the reactance value and each capacitance value, the test frequency is obtained, including: calculating the test frequency using the following formula:

[0010]

[0011] Where L is the reactance value of the oil-immersed shunt reactor under test, and C is the total capacitance value of the reactive power compensation area capacitor selected as the compensation capacitor.

[0012] Furthermore, the test voltage is 80% of the factory test voltage of the oil-immersed shunt reactor under test.

[0013] Furthermore, the first frequency range is 30-300Hz.

[0014] Thirdly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the methods provided in the above embodiments.

[0015] Fourthly, embodiments of the present invention also provide an electronic device, including: a processor; a memory for storing executable instructions of the processor; the processor being configured to read the executable instructions from the memory and execute the executable instructions to implement the methods provided in the above embodiments.

[0016] The reactor field AC withstand voltage test device and method provided in this invention significantly reduces the investment amount of test equipment, simplifies the test wiring, and reduces the workload of traditional resonance tests using dedicated test capacitors by employing reactive power compensation capacitors as capacitance compensation and utilizing existing capacitor equipment in substations to carry out the test. This improves test efficiency. At the same time, the use of synchronous spatial coupling antennas to resist corona interference greatly reduces interference signals caused by line structure corona, and maximizes the restoration of the partial discharge signal characteristics of the equipment body, enabling effective and accurate judgment of the internal insulation state of the reactor under test. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of the reactor field AC withstand voltage test device according to an embodiment of the present invention is shown;

[0018] Figure 2 An exemplary flowchart of a reactor field AC withstand voltage test method according to an embodiment of the present invention is shown. Detailed Implementation

[0019] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0020] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0021] Figure 1 A schematic diagram of the structure of a reactor field AC withstand voltage test device according to an embodiment of the present invention is shown.

[0022] like Figure 1 As shown, the field AC withstand voltage test device for the reactor includes:

[0023] Variable frequency power supply 101 is used to adjust the power frequency of the reactor field AC withstand voltage test device;

[0024] Intermediate transformer 102 is used to increase the power supply voltage of the on-site AC withstand voltage test device for reactors;

[0025] The space corona coupling antenna 103 is used to monitor the space coupling signal of the reactor field AC withstand voltage test device and send the monitored space coupling signal to the partial discharge measurement device.

[0026] Capacitor voltage divider 104 is used to measure whether the high-voltage side voltage of the reactor field AC withstand voltage test device meets the test requirements;

[0027] The reactive power compensation area capacitor bank 105 is used to provide capacitance compensation for the reactor on-site AC withstand voltage test device.

[0028] The detection impedance is 106, which is used to obtain the first partial discharge signal from the high-voltage bushing of the oil-immersed shunt reactor under test.

[0029] The partial discharge measuring device 107 is used to measure the first partial discharge signal of the high-voltage bushing of the oil-immersed shunt reactor under test, and to process the measured first partial discharge signal according to the spatial coupling signal to obtain and output the second partial discharge signal.

[0030] Among them, the primary winding of the intermediate transformer 102 is connected to the frequency converter 101, and one end of the secondary winding of the intermediate transformer 102 is grounded, while the other end is connected to the oil-immersed shunt reactor under test.

[0031] The capacitor divider 104 is connected in parallel with the capacitor bank 105 in the reactive power compensation area. After parallel connection, one end is connected to the oil-immersed parallel reactor under test and the high-voltage bushing of the oil-immersed parallel reactor under test, and the other end is grounded.

[0032] One end of the detection impedance 106 is connected to the high-voltage bushing of the oil-immersed shunt reactor under test, and the other end is grounded;

[0033] The partial discharge measuring device 107 is connected to the detection impedance 106 and the space corona coupling antenna 103, respectively.

[0034] Furthermore, the reactor field AC withstand voltage test device also includes:

[0035] The coupled corona signal conversion device 108 is connected to the space corona coupling antenna 103 and the partial discharge measurement device 107 respectively, and is used to convert the space coupling signal monitored by the space corona coupling antenna 103 and send it to the partial discharge measurement device 107.

[0036] Furthermore, the impedance detection 106 is an impedance detection component using the pulse current method, and the partial discharge measurement device 107 is a partial discharge test measurement device using the pulse current method.

[0037] Specifically, a partial discharge test measuring device using the pulse current method is connected to the high-voltage bushing end screen of the oil-immersed shunt reactor under test to measure the overall partial discharge signal.

[0038] Further, the measured first partial discharge signal is processed based on the spatial coupling signal, including:

[0039] Subtract the spatial coupling signal from the measured first partial discharge signal.

[0040] Specifically, the information monitored by the antenna is synchronized to the partial discharge measurement device. Then, the partial discharge measurement device subtracts the signal coupled from the antenna from the overall partial discharge signal measured, and the remaining signal is the actual partial discharge signal.

[0041] The above embodiments, by using reactive power compensation capacitors as capacitance compensation and utilizing existing capacitor equipment in substations to conduct this test, significantly reduce the investment amount of test equipment, simplify test wiring, reduce the workload of traditional resonance tests using dedicated test capacitors, and improve test efficiency. At the same time, the use of synchronous spatial coupling antennas to resist corona interference greatly reduces interference signals caused by line structure corona, and restores the partial discharge signal characteristics of the equipment body to the greatest extent, which can effectively and realistically determine the internal insulation state of the reactor under test.

[0042] Figure 2 An exemplary flowchart of a reactor field AC withstand voltage test method according to an embodiment of the present invention is shown.

[0043] like Figure 2 As shown, the method for on-site AC withstand voltage testing of reactors, applied to the on-site AC withstand voltage testing apparatus for reactors provided in the above embodiments, includes:

[0044] Step S201: Obtain the test voltage, the reactance value of the oil-immersed parallel reactor under test, and the capacitance value of each reactive power compensation zone capacitor in the reactive power compensation zone capacitor bank;

[0045] Step S202: Obtain the test frequency based on the reactance value and the value of each capacitor;

[0046] Step S203: Determine whether the test frequency meets the first frequency range. If it does, proceed to the next step. Otherwise, select some reactive power compensation area capacitors from the reactive power compensation area capacitor bank as compensation capacitors, and return to the previous step to recalculate the test frequency until the test frequency meets the first frequency range.

[0047] Step S204: Obtain the measured system impedance, and obtain the test loop current based on the test voltage and system impedance;

[0048] Step S205: Determine whether the test circuit current meets the parameter requirements of the oil-immersed shunt reactor under test. If it does, complete the test setup and perform AC withstand voltage and partial discharge measurement tests on the oil-immersed shunt reactor under test and its high-voltage bushing. Otherwise, select a reactive power compensation capacitor from the reactive power compensation capacitor bank as the compensation capacitor and return to the test frequency calculation step until the test circuit current meets the parameter requirements of the oil-immersed shunt reactor under test.

[0049] Furthermore, based on the reactance value and each capacitance value, the test frequency is obtained, including:

[0050] The test frequency is calculated using the following formula:

[0051]

[0052] Where L is the reactance value of the oil-immersed shunt reactor under test, and C is the total capacitance value of the reactive power compensation area capacitor selected as the compensation capacitor.

[0053] Furthermore, the test voltage is 80% of the factory test voltage of the oil-immersed shunt reactor under test.

[0054] Furthermore, the first frequency range is 30-300Hz.

[0055] Specifically, the reactance value of the oil-immersed shunt reactor under test and the capacitance value of each reactive power compensation zone capacitor are inherent parameters that can be obtained from the equipment nameplate.

[0056] The above embodiments, by adjusting the range of the reactive power compensation region capacitor used as a compensation capacitor, ensure that the test frequency and test circuit current meet the test requirements, simplify the test process, reduce the workload of traditional resonant tests using dedicated test capacitors, effectively shorten the test time, and improve test efficiency.

[0057] Example 1

[0058] First, determine the test voltage based on the rated voltage of the oil-immersed shunt reactor to be tested. According to GB50150-2016, the field acceptance test voltage value for UHV oil-immersed low-voltage reactive power compensation shunt reactor is 160kV×0.8=128kV.

[0059] Then, based on the reactance value of the oil-immersed parallel reactor to be tested being approximately 45.9Ω, and the capacitance of the entire capacitor unit in the reactive power compensation area being approximately 138.64μF, the resonant frequency was calculated to be approximately 12.5Hz, which does not meet the standard requirement of 30Hz-300Hz.

[0060] Then, based on a single capacitor unit of 41.1μF, the capacitance was recalculated. The calculation showed that 12 capacitors should be connected in series to the test system. After connecting 12 capacitors in series, the total capacitance was approximately 3.425μF, and the calculated resonant frequency was approximately 33Hz, which met the requirements.

[0061] The circuit current of the test system was then calculated to be approximately 13.3A, which meets the test requirements of the reactor under test.

[0062] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the reactor field AC withstand voltage test method provided in the above embodiments.

[0063] This invention also provides an electronic device, comprising: a processor; a memory for storing processor-executable instructions; the processor being configured to read the executable instructions from the memory and execute the instructions to implement the reactor field AC withstand voltage test method provided in the above embodiments.

[0064] The invention has been described with reference to a few embodiments. However, as will be known to those skilled in the art, and as defined in the appended claims, other embodiments besides those disclosed above fall equivalently within the scope of the invention.

[0065] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the art, unless otherwise expressly defined herein. All references to “a / the / the [device, component, etc.]” ​​are openly interpreted as at least one instance of said device, component, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed unless explicitly stated otherwise.

[0066] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied 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.

[0067] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0068] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0069] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A field AC withstand voltage test device for reactors, characterized in that, include: Variable frequency power supply is used to adjust the power frequency of the reactor on-site AC withstand voltage test device; Intermediate transformer, used to increase the power supply voltage of the on-site AC withstand voltage test device for reactors; The space corona coupling antenna is used to monitor the space coupling signal of the reactor's on-site AC withstand voltage test device and send the monitored space coupling signal to the partial discharge measurement device. A capacitive voltage divider is used to measure whether the high-voltage side voltage of the reactor's on-site AC withstand voltage test device meets the test requirements. The reactive power compensation area capacitor bank is used to provide capacitance compensation for the on-site AC withstand voltage test device for reactors. The detection impedance is used to obtain the first partial discharge signal from the high-voltage bushing of the oil-immersed shunt reactor under test; A partial discharge measuring device is used to measure the first partial discharge signal of the high-voltage bushing of the oil-immersed shunt reactor under test, and to process the measured first partial discharge signal according to the spatial coupling signal to obtain and output a second partial discharge signal. The primary winding of the intermediate transformer is connected to the frequency converter, and one end of the secondary winding of the intermediate transformer is grounded, while the other end is connected to the oil-immersed shunt reactor under test. The capacitor divider is connected in parallel with the capacitor bank in the reactive power compensation area. After parallel connection, one end is connected to the oil-immersed parallel reactor under test and the high-voltage bushing of the oil-immersed parallel reactor under test, and the other end is grounded. One end of the impedance detection is connected to the high-voltage bushing of the oil-immersed shunt reactor under test, and the other end is grounded. The partial discharge measurement device is connected to the detection impedance and the spatial corona coupling antenna, respectively.

2. The reactor field AC withstand voltage test device according to claim 1, characterized in that, Also includes: The coupled corona signal conversion device is connected to the space corona coupling antenna and the partial discharge measurement device, respectively, and is used to convert the space coupling signal monitored by the space corona coupling antenna and send it to the partial discharge measurement device.

3. The reactor field AC withstand voltage test device according to claim 1, characterized in that, The first partial discharge signal obtained by measurement is processed according to the spatial coupling signal, including: The spatial coupling signal is subtracted from the measured first partial discharge signal.

4. The reactor field AC withstand voltage test device according to claim 1, characterized in that, The impedance detection device is an impedance detection component using the pulse current method, and the partial discharge measurement device is a partial discharge test measurement device using the pulse current method.

5. A method for on-site AC withstand voltage test of a reactor, characterized in that, The reactor field AC withstand voltage test apparatus according to any one of claims 1-4 comprises: Obtain the test voltage, the reactance value of the oil-immersed parallel reactor under test, and the capacitance value of each capacitor in the reactive power compensation area of ​​the capacitor bank. The test frequency is obtained based on the reactance value and each capacitance value; Determine whether the test frequency meets the first frequency range. If it does, proceed to the next step. Otherwise, select some reactive power compensation area capacitors from the reactive power compensation area capacitor bank as compensation capacitors, and return to the previous step to recalculate the test frequency until the test frequency meets the first frequency range. Obtain the measured system impedance, and calculate the test loop current based on the test voltage and system impedance; Determine whether the test circuit current meets the parameter requirements of the oil-immersed shunt reactor under test. If it does, complete the test setup and perform AC withstand voltage and partial discharge measurement tests on the oil-immersed shunt reactor under test and its high-voltage bushing. Otherwise, select a reactive power compensation capacitor from the reactive power compensation capacitor bank as the compensation capacitor and return to the test frequency calculation step until the test circuit current meets the parameter requirements of the oil-immersed shunt reactor under test.

6. The method for on-site AC withstand voltage test of a reactor according to claim 5, characterized in that, Based on the reactance value and each capacitance value, the test frequency is obtained, including: The test frequency is calculated using the following formula: Where L is the reactance value of the oil-immersed shunt reactor under test, and C is the total capacitance value of the reactive power compensation area capacitor selected as the compensation capacitor.

7. The method for on-site AC withstand voltage test of a reactor according to claim 5, characterized in that, The test voltage is 80% of the factory test voltage of the oil-immersed shunt reactor under test.

8. The method for on-site AC withstand voltage test of a reactor according to claim 5, characterized in that, The first frequency range is 30-300Hz.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the on-site AC withstand voltage test method for reactors as described in any one of claims 5-8.

10. An electronic device, comprising: processor; Memory used to store the processor's executable instructions; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the reactor field AC withstand voltage test method according to any one of claims 5-8.

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