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Fourier series based measurement method of phase angle of partial discharge pulse

A technology of partial discharge pulse and Fourier series, which is applied to the phase angle between voltage and current, measuring device, and measuring electric variables, etc., to achieve the effect of reducing the amount of signal processing and reducing storage space requirements

Active Publication Date: 2012-06-20
STATE GRID CORP OF CHINA +1
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  • Fourier series based measurement method of phase angle of partial discharge pulse
  • Fourier series based measurement method of phase angle of partial discharge pulse
  • Fourier series based measurement method of phase angle of partial discharge pulse

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Embodiment Construction

[0044] In this embodiment, the method for measuring the phase angle of a partial discharge pulse according to the present invention will be further described in conjunction with the accompanying drawings.

[0045] Such as figure 1 As shown, the partial discharge pulse phase angle measurement method in this embodiment includes the following steps:

[0046] (1) Use a high-frequency partial discharge signal sensor to detect high-frequency partial discharge pulse signals (such as UHF signals), and use a power frequency signal sensor to detect power frequency signals;

[0047] (2) Amplify and filter the high-frequency partial discharge pulse signal and the power frequency signal respectively;

[0048] (3) The first acquisition system collects the high-frequency partial discharge pulse signal transmitted by the first sensor in sections, and the first acquisition system also outputs a trigger signal while starting to collect the high-frequency partial discharge pulse signal transmit...

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Abstract

The invention discloses a Fourier series based measurement method of a phase angle of a partial discharge pulse, which comprises the following steps: adopting a first sensor to detect a high-frequency partial discharge pulse signal, and adopting a second sensor to detect a power frequency signal; adopting a first acquisition system to segmentedly acquire the high-frequency partial discharge pulse signal transmitted by the first sensor, the first acquisition system starting to acquire the high-frequency partial discharge pulse signal transmitted by the first sensor and simultaneously outputting a trigger signal so as to trigger a second acquisition system, so that the second acquisition system synchronously acquire the power frequency signal transmitted by the second sensor; transmitting the acquired high-frequency local discharge pulse signal and power frequency signal to a data analysis system by the first acquisition system and the second acquisition system; and calculating the phase angle of the high-frequency partial discharge pulse signal according to the triggered initial power frequency signal by the data analysis system.

Description

technical field [0001] The invention relates to a signal detection method, in particular to a phase angle measurement method of a partial discharge pulse signal. Background technique [0002] As an important means of insulation diagnosis, partial discharge detection is being popularized by the power sector because it can reflect the insulation status of electrical equipment in the power system in a timely and effective manner. At present, the partial discharge detection method based on electric quantity is mostly used. According to the frequency band, the detection signal can be divided into broadband or narrowband signal below 500KHz, high frequency (High frequency-HF) signal below 10MHz, and very high frequency (Very Frequency-HF) signal below 200MHz. High Frequency-VHF) signal and Ultra High Frequency-UHF signal below 3GHz. The collected partial discharge signal is mainly analyzed in two ways, that is, a phase-based analysis mode (Phase Resolved Partial Discharge-PRPD) a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R25/00G01R23/16G01R31/12
Inventor 苗培青李秀卫慕世友姚金霞袁海燕
Owner STATE GRID CORP OF CHINA
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