High-voltage low-pass filter and design method thereof

Abstract

The invention provides a high-voltage low-pass filter. The filter comprises an electric reactor and a capacitor, and the high-voltage low-pass filter is a low-pass filter with the voltage grade of 100kV or higher. The high-pressure low-pass filter further comprises a grading ring located at the top of the high-voltage low-pass filter and between the electric reactor and the capacitor of the high-voltage low-pass filter, so that the electric field intensity of the surface of a high-voltage electrode is reduced. The invention further provides a method for designing the high-voltage low-pass filter.

Description

technical field [0001] The invention relates to the field of low-pass filters. More specifically, it relates to a high-voltage low-pass filter and a design method thereof. Background technique [0002] The partial discharge test is a routine test in the production and design process of power transformers with a voltage level of 110kV and above and most dry-type power transformers. The test power supply mostly uses generator sets. Due to the different equipment conditions of each manufacturer, the test conditions are very different. , Most of the generator sets, intermediate transformers and other equipment in transformer manufacturers are outdated, and the power supply of the test station is mixed with the production power of the workshop. Therefore, the background noise is very large during the partial discharge measurement, which affects the accuracy of the test measurement, and even a lot of power supply interference makes the test difficult. conduct. [0003] At presen...

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Problems solved by technology

[0002] The partial discharge test is a routine test in the production and design process of power transformers with a voltage level of 110kV and above and most dry-type power transformers. The test power supply mostly uses generator sets. Due to the different equipment conditions of each manufacturer, the test conditions are very different. , Most of the generator sets, intermediate transformers and other equipment in transformer manufacturers are outdated, and the power supply of the test station is mixed with the production power of the workshop. Therefore, the background noise is very large during the partial discharge measurement, which affects the accuracy of the test measurement, and even a lot of power supply interference makes the test difficult. conduct

[0003] At present, due to the power transformer with a voltage level of 110kV and above, the voltage on the input side of the voltage transformer under test is 6kV, 10kV or 35kV, and there is no filter that can filter out the interference. Instead, it is filtered through an intermediate transformer or an isolation transformer. The filtering effect is limited, one transformer usually can only filter about 10dB, and multiple transformers are connected in series, because the test power frequency is 150-200Hz, the short-circuit impedance increases greatly, and the loss during the test process is very large at high voltage levels

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