Automatic inductance compensation method and system for voltage transformer withstand voltage test device

Abstract

The invention discloses an automatic inductance compensation method for a voltage transformer withstand voltage test device, which relates to the technical field of electric energy metering and comprises the following steps: a test host applies test parameter information to a voltage transformer; parameters of the voltage transformer are collected to obtain measurement data information; calculating an optimal compensation inductance value according to the measurement data information and the test parameter information; and controlling the adjustable compensation inductor according to the optimal compensation inductance value to enable the adjustable compensation inductor to output the optimal compensation inductance value. The invention further discloses an automatic inductance compensation system for the voltage transformer withstand voltage test device. The voltage transformer test is compensated by accurately calculating the compensation inductance value, the accuracy and precision of the test are ensured, and the test efficiency and the test reliability are improved.

Description

Technical Field

[0001] The invention relates to the technical field of power equipment measurement, and in particular to an automatic inductance compensation method and system for a voltage transformer withstand voltage test device. Background Art

[0002] With the development of the times, the construction of substations is becoming more and more integrated and modular, and GIS equipment is often used. GIS equipment is installed in GIS rooms on multiple floors. To conduct the inductive withstand voltage test of voltage transformers, the test equipment needs to be moved to the GIS room on higher floors, which is a heavy task. For the inductive withstand voltage test of GIS voltage transformers of 110kV and above, the primary winding needs to be raised to a higher voltage. At the same time, since the primary winding of the GIS voltage transformer is connected with the guide rod, its overall capacitance to the ground is relatively large. The inductive test is performed by pressurizing the secondary winding. Controlling the current passing through the secondary winding is a key point of this test.

[0003] Traditional test equipment is often bulky and heavy, which is not convenient for on-site operation. The existing instruments on the market that can perform 220kV voltage transformer inductive withstand voltage test all adopt the design principle of frequency converter combined with excitation transformer, and weigh about 50kg, which is very difficult to carry every time. At the same time, since the voltage transformer inductive withstand voltage test is in a capacitive load state, in order to reduce the capacity of the test equipment and avoid frequency resonance, it is necessary to connect the compensation inductor to the secondary winding according to different voltage levels during the test. 110kV and 220kV voltage transformers must select compensation inductors. However, the calculation and selection of compensation inductors are very complicated, and the compensation inductor gears need to be switched multiple times each time, which takes too much time, even up to 4 hours, and seriously affects work efficiency. Summary of the invention

[0004] The technical problem to be solved by the present invention is to solve the deficiencies in the prior art, design an automatic inductance compensation method and system for a voltage transformer withstand voltage test device, and improve the accuracy and efficiency of the voltage transformer inductive withstand voltage test through automated and precise design.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] An automatic inductance compensation method for a voltage transformer withstand voltage test device comprises:

[0007] The test host applies test parameter information to the voltage transformer;

[0008] Collecting parameters of the voltage transformer to obtain measurement data information;

[0009] Calculate the optimal compensation inductance based on the measurement data information and test parameter information;

[0010] The adjustable compensation inductor is controlled according to the optimal compensation inductance so that it outputs the optimal compensation inductance.

[0011] As a further technical solution of the present invention, the acquisition of measurement data information from the parameters of the voltage transformer specifically includes:

[0012] The data acquisition module arranged on the voltage transformer collects the frequency, voltage and current information of the voltage transformer.

[0013] As a further technical solution of the present invention, the test host uses a frequency conversion transformer to provide voltage and current for testing the voltage transformer.

[0014] As a further technical solution of the present invention, the optimal supplementary inductance is calculated according to the measurement data information and the test parameter information; specifically comprising:

[0015] The measurement data information includes frequency, voltage and current information of the voltage transformer;

[0016] Calculate the actual power factor based on the frequency, voltage and current of the voltage transformer;

[0017] The actual power factor is compared with the set power factor corresponding to the test parameter information, and the optimal compensation inductance is calculated.

[0018] As a further technical solution of the present invention, the control of the adjustable compensation inductor according to the optimal compensation inductance to output the optimal compensation inductance specifically includes:

[0019] The actual power factor is compared with the set power factor. When the actual power factor is less than the set power factor, the compensation inductance device is controlled to increase the compensation inductance; when the actual power factor is greater than the set power factor, the compensation inductance device is controlled to reduce the compensation inductance.

[0020] As a further technical solution of the present invention, the set power factor is 0.7-0.9.

[0021] As a further technical solution of the present invention, the method of calculating the optimal compensation inductance according to the measurement data information and the test parameter information also includes:

[0022] The data acquisition module sends the measurement data information to the test host, and the data acquisition module and the test host communicate via Bluetooth.

[0023] As a further technical solution of the present invention, the test host communicates with the automatic compensation inductance device via optical fiber.

[0024] As a further technical solution of the present invention, an automatic inductance compensation system for a voltage transformer withstand voltage test device comprises:

[0025] The test module, the test host applies test parameter information to the voltage transformer;

[0026] A data acquisition module collects the parameters of the voltage transformer to obtain measurement data information;

[0027] The compensation inductance calculation module calculates the optimal compensation inductance according to the measurement data information and the test parameter information;

[0028] The compensation inductor output module controls the adjustable compensation inductor according to the optimal compensation inductance so as to output the optimal compensation inductance.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention compensates the voltage transformer test by accurately calculating the compensation inductance, thereby ensuring the accuracy and precision of the test and improving the test efficiency and reliability.

[0031] 2. The present invention adopts a frequency conversion transformer to change the power supply frequency through the frequency conversion transformer to provide stable voltage and current for the test of the voltage transformer. At the same time, the frequency conversion transformer can ensure that the voltage transformer will not be damaged during the test. The use of the frequency conversion transformer can also reduce the volume and weight of the voltage withstand tester, making the voltage withstand tester lightweight, convenient for rapid transportation and operation at the test site, and improving the efficiency of the test.

[0032] 3. An adjustable compensating inductor was introduced into the test. By adjusting the inductance, the capacitance effect was compensated, making the test voltage waveform closer to a sine wave, thereby increasing the COSθ value. This process not only helps to improve the accuracy of the test results, but also reveals potential insulation defects in the voltage transformer, providing a strong guarantee for the safe and stable operation of the power system.

[0033] 4. The data acquisition module and the test host adopt wireless transmission mode, the test does not require wiring, and it is easy to install and use.

[0034] 5. The inductance value is transmitted to the adjustable compensation inductor through optical fiber, and the adjustable compensation inductor automatically adjusts the fixed value according to the data; optical fiber communication is used to prevent interference from electromagnetic signals and ensure safety during the test.

[0035] 6. The present invention calculates the compensation inductance according to the actual measurement data and the set parameter information, and automatically adjusts the inductance for compensation as needed. It is suitable for compensating the capacitance effect in the voltage transformer in the inductive withstand voltage test, so that the test voltage waveform is closer to a sine wave, thereby improving the accuracy of the test results.

[0036] 7. The present invention can timely discover potential defects of voltage transformers, such as insulation problems between turns, layers and sections, through precise induction withstand voltage tests, which helps to avoid equipment failure or damage during operation, thereby improving the safety and reliability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A flow chart of the automatic inductance compensation method for a voltage transformer withstand voltage test device proposed by the present invention;

[0038] Figure 2 This is a specific implementation flow chart of the automatic inductance compensation method for a voltage transformer withstand voltage test device proposed by the present invention;

[0039] Figure 3 This is a structural diagram of the automatic inductance compensation system for a voltage transformer withstand voltage test device proposed by the present invention. DETAILED DESCRIPTION

[0040] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments:

[0041] It should be noted that the structures, colors, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0042] like Figure 1 As shown, the present invention provides an automatic inductance compensation method for a voltage transformer withstand voltage test device, comprising:

[0043] Step 101, the test host applies test parameter information to the voltage transformer;

[0044] Step 102, collecting parameters of the voltage transformer to obtain measurement data information;

[0045] Step 103, calculating the optimal compensation inductance according to the measurement data information and the test parameter information;

[0046] Step 104: Control the adjustable compensation inductor according to the optimal compensation inductance to output the optimal compensation inductance.

[0047] See also Figure 2The automatic inductance compensation method for a voltage transformer withstand voltage test device proposed in an embodiment of the present invention is used to compensate for the withstand voltage test of the voltage transformer. Specifically, at the beginning of the test, the switch state of the automatic adjustment compensation inductance device is first determined. If the automatic adjustment compensation inductance device is in a closed state, the automatic adjustment compensation inductance device is controlled to be disconnected; when the automatic adjustment compensation inductance device is in a disconnected state, the test host performs a withstand voltage test on the voltage transformer and applies test parameter information to the voltage transformer, wherein the test parameter information is a test frequency and a test voltage; the parameters of the voltage transformer are collected to obtain measurement data information, and at this time, the parameters of the voltage transformer are collected after the test host applies the test voltage and the test frequency; there is a difference between the measurement data information and the applied test parameter information, and the difference is the inductance that needs to be compensated, so the optimal compensation inductance is calculated according to the measurement data information and the test parameter information to satisfy the test voltage and current, and then the automatic adjustment compensation inductance device is controlled to install the optimal compensation inductance and output the compensation inductance to complete the test process.

[0048] The present invention compensates for a voltage transformer test by accurately calculating the compensation inductance, thereby ensuring the accuracy and precision of the test and improving the test efficiency and the reliability of the test.

[0049] In the embodiment of the present invention, a voltage withstand test is performed on a voltage transformer through a test host, i.e., a multi-frequency induction voltage withstand tester, wherein the multi-frequency induction voltage withstand tester adopts a frequency converter, and changes the power supply frequency through the frequency converter to provide stable voltage and current for the test of the voltage transformer. At the same time, the frequency converter can ensure that the voltage transformer will not be damaged during the test. The use of the frequency converter can also reduce the volume and weight of the voltage withstand tester, making the voltage withstand tester lightweight, convenient for rapid transportation and operation at the test site, and improving the efficiency of the test.

[0050] In step 102, the parameters of the voltage transformer are collected to obtain measurement data information, specifically including: a data acquisition module set on the voltage transformer collects the frequency, voltage and current information of the voltage transformer. The data acquisition module is a voltage and current detector, which is used to monitor the voltage and current information of the voltage transformer to provide a basis for calculating the compensation inductance.

[0051] In step 103, the optimal supplementary inductance is calculated according to the measurement data information and the test parameter information; specifically, the step includes:

[0052] The measurement data information includes frequency, voltage and current information of the voltage transformer;

[0053] Calculate the actual power factor based on the frequency, voltage and current of the voltage transformer;

[0054] The actual power factor is compared with the set power factor corresponding to the test parameter information, and the optimal compensation inductance is calculated.

[0055] The power factor COSθ is the cosine value that describes the phase difference between voltage and current in an AC circuit, and reflects the ratio of active power to apparent power in the circuit. In the voltage transformer inductive withstand voltage test, the size of COSθ is closely related to factors such as the waveform of the test voltage, the inductance and capacitance in the circuit. In the inductive withstand voltage test, the ideal test voltage waveform should be a standard sine wave. However, due to the inductance and capacitance effects of the voltage transformer itself, as well as other components that may exist in the test circuit, the test voltage waveform often undergoes a certain degree of distortion. In order to compensate for this distortion, an adjustable compensation inductor is introduced into the test. By adjusting the inductance, the capacitance effect is compensated, making the test voltage waveform closer to a sine wave, thereby increasing the value of COSθ. This process not only helps to improve the accuracy of the test results, but also can reveal potential insulation defects in the voltage transformer, providing a strong guarantee for the safe and stable operation of the power system.

[0056] In the embodiment of the present invention, the adjustable compensation inductor is controlled according to the optimal compensation inductance to output the optimal compensation inductance, specifically including: comparing the actual power factor with the set power factor, when the actual power factor is less than the set power factor, controlling the compensation inductor device to increase the compensation inductance; when the actual power factor is greater than the set power factor, controlling the compensation inductor device to reduce the compensation inductance. The set power factor is 0.7-0.9.

[0057] In an embodiment of the present invention, the optimal compensation inductance is calculated according to the measurement data information and the test parameter information; and further includes: the data acquisition module sends the measurement data information to the test host, and the data acquisition module and the test host communicate via Bluetooth.

[0058] The data acquisition module and the test host are wirelessly transmitted. The test does not require wiring and is easy to install and use. The inductance value is transmitted to the adjustable compensation inductor through optical fiber, and the adjustable compensation inductor automatically adjusts the fixed value according to the data. Optical fiber communication is used to prevent interference from electromagnetic signals and ensure safety during the test.

[0059] In the embodiment of the present invention, the test host communicates with the automatic compensation inductance device via optical fiber. The test host sends control instructions to the automatic compensation inductance device according to the compensation inductance. The automatic compensation inductance device automatically adjusts the compensation inductance output according to the compensation inductance to ensure the test accuracy of the voltage transformer.

[0060] See also Figure 3 The present invention also provides an automatic inductance compensation system for a voltage transformer withstand voltage test device, comprising:

[0061] Testing module 201, the test host applies test parameter information to the voltage transformer;

[0062] The data acquisition module 202 collects the parameters of the voltage transformer to obtain measurement data information;

[0063] The compensation inductance calculation module 203 calculates the optimal compensation inductance according to the measurement data information and the test parameter information;

[0064] The compensation inductance output module 204 controls the adjustable compensation inductance according to the optimal compensation inductance to output the optimal compensation inductance.

[0065] The present invention calculates the compensation inductance according to actual measurement data and set parameter information, and automatically adjusts the inductance for compensation as needed. It is suitable for compensating the capacitance effect in the voltage transformer in the inductive withstand voltage test, so that the test voltage waveform is closer to a sine wave, thereby improving the accuracy of the test result. By automatically adjusting the compensation inductance, the device can more accurately simulate the actual operating conditions, thereby more accurately evaluating the performance of the voltage transformer.

[0066] The present invention can timely discover potential defects of the voltage transformer, such as insulation problems between turns, layers and sections, through accurate induction withstand voltage test, which helps to avoid failure or damage of the equipment during operation, thereby improving the safety and reliability of the power system.

[0067] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. must be possessed by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and facilitation of understanding, rather than limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0068] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0069] The block diagrams of the devices, systems, equipment, and systems involved in the present invention are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, systems, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, meaning "including but not limited to", and can be used interchangeably therewith.

[0070] The method and system of the present invention may be implemented in many ways. For example, the method and system of the present invention may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of steps for the method is for illustration only, and the steps of the method of the present invention are not limited to the order specifically described above, unless otherwise specifically stated.

[0071] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. Automatic inductance compensation method for voltage transformer withstand voltage test device, Features: include: The test host applies test parameter information to the voltage transformer; Collecting parameters of the voltage transformer to obtain measurement data information; Calculate the optimal compensation inductance based on the measurement data information and test parameter information; The adjustable compensation inductor is controlled according to the optimal compensation inductance so that it outputs the optimal compensation inductance.

2. The automatic inductance compensation method for a voltage transformer withstand voltage test device according to claim 1, Features: The acquisition of measurement data information from the voltage transformer parameters specifically includes: The data acquisition module arranged on the voltage transformer collects the frequency, voltage and current information of the voltage transformer.

3. The automatic inductance compensation method for a voltage transformer withstand voltage test device according to claim 1, Features: The test host uses a frequency conversion transformer to provide voltage and current for testing the voltage transformer.

4. The automatic inductance compensation method for a voltage transformer withstand voltage test device according to claim 1, Features: The method of calculating the optimal supplementary inductance according to the measurement data information and the test parameter information specifically includes: The measurement data information includes frequency, voltage and current information of the voltage transformer; Calculate the actual power factor based on the frequency, voltage and current of the voltage transformer; The actual power factor is compared with the set power factor corresponding to the test parameter information, and the optimal compensation inductance is calculated.

5. The automatic inductance compensation method for a voltage transformer withstand voltage test device according to claim 1, Features: The step of controlling the adjustable compensation inductor according to the optimal compensation inductance to output the optimal compensation inductance specifically includes: The actual power factor is compared with the set power factor. When the actual power factor is less than the set power factor, the compensation inductance device is controlled to increase the compensation inductance; when the actual power factor is greater than the set power factor, the compensation inductance device is controlled to reduce the compensation inductance.

6. The automatic inductance compensation method for a voltage transformer withstand voltage test device according to claim 5, Features: The set power factor is 0.7-0.

9.

7. The automatic inductance compensation method for a voltage transformer withstand voltage test device according to claim 1, Features: The method further comprises calculating the optimal compensation inductance according to the measurement data information and the test parameter information; The data acquisition module sends the measurement data information to the test host, and the data acquisition module and the test host communicate via Bluetooth.

8. The automatic inductance compensation method for a voltage transformer withstand voltage test device according to claim 1, Features: The test host communicates with the automatic compensation inductance device via optical fiber.

9. Automatic inductance compensation system for voltage transformer withstand voltage test device, Features: The automatic inductance compensation method for a voltage transformer withstand voltage test device as claimed in any one of claims 1 to 8 comprises: The test module, the test host applies test parameter information to the voltage transformer; A data acquisition module collects the parameters of the voltage transformer to obtain measurement data information; The compensation inductance calculation module calculates the optimal compensation inductance according to the measurement data information and the test parameter information; The compensation inductor output module controls the adjustable compensation inductor according to the optimal compensation inductance so as to output the optimal compensation inductance.

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