Method and apparatus for determining time domain parameter of partial discharge current of high voltage IGBT

A technology of partial discharge and time-domain parameters, applied in the direction of testing dielectric strength, etc., can solve the problem of short partial discharge pulse time

Active Publication Date: 2018-01-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
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Problems solved by technology

[0005] However, due to the very short time of the partial discharge pulse, the measurement of the broadband partial discharge current time domain signal requires a high sampling rate, so a large amount of data will be generated during the test

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  • Method and apparatus for determining time domain parameter of partial discharge current of high voltage IGBT
  • Method and apparatus for determining time domain parameter of partial discharge current of high voltage IGBT

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Embodiment Construction

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045] The embodiment of the present invention provides a method for determining a time domain parameter of a partial discharge current of a high-voltage IGBT. The specific steps are as follows: figure 1 The specific process is as follows:

[0046] S101: Obtain the partial discharge current of the high-voltage IGBT through the HFCT type broadband pulse current sensor, and pre-screen the partial discharge current to obtain the partial discharge pulse;

[0047] S102: Count the partial discharge pulses pre-screened in S101, and extract the current amplitude of the partial discharge pulses;

[0048] S103: Determine a time domain parameter according to the current amplitude of the partial discharge pulse extracted in S102.

[0049] In the above S101, the specific process of pre-screening the partial discharge current to obtain the partial discharge pulse is as ...

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Abstract

The invention provides a method and apparatus for determining a time domain parameter of the partial discharge current of a high voltage IGBT. The method includes the following steps: pre-screening partial discharge currents of a high voltage IGBT to obtain partial discharge pulses; then counting the partial discharge pulses that are pre-screened, and extracting the current magnitudes of the partial discharge pulses; and eventually based on the current magnitudes of the partial discharge pulses, obtaining a time domain magnitude of the partial discharge pulses. According to the invention, thetime domain parameter of the partial discharge pulses obtained by the method herein can sensitively detect and identify the defect of insulation in the process of designing and manufacturing the highvoltage IGBT. And in case the large amount of original data obtained from tests do not undergo denoise pre-processing, the method herein can accurately and rapidly extract the time domain parameter ofthe partial discharge pulses of the partial discharge currents, and further acquires a partial discharge mode in presence of the defect of insulation of the high voltage IGBT.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method and a device for determining a time domain parameter of a partial discharge current of a high-voltage IGBT. Background technique [0002] Flexible DC transmission technology has become the preferred technical solution to solve the problem of large-scale grid connection of new energy and long-distance large-capacity transmission due to its flexible modulation, compact system, safety and reliability. The core of the flexible DC transmission technology is to realize the flexible transformation and regulation of high-voltage and high-power power electronic equipment such as electric high-voltage flexible DC converter valves and high-voltage DC circuit breakers. High power power electronics. At this stage, the fully-controlled high-voltage and high-power power electronic devices used in flexible DC transmission technology are mainly high-voltage IGBTs. [0003] The hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 付鹏宇金锐文腾王浩宇李立赵志斌
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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