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Partial discharge detecting method of transformers

A partial discharge detection and transformer technology, applied in the direction of testing dielectric strength, etc., can solve the problems of large positioning error, inability to accurately locate, and lack of real advantages of the combination of sound and electricity, and achieve the effect of improving positioning accuracy and improving detection accuracy.

Active Publication Date: 2015-03-04
北京博电新能电力科技有限公司 +1
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Although this method uses the method of combined acoustic and electric measurement, it has the defects of large error and inaccurate positioning in positioning.
At the same time, the electric channel is only used as a trigger channel, and does not give full play to the real advantages of the combination of sound and electricity

Method used

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  • Partial discharge detecting method of transformers
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  • Partial discharge detecting method of transformers

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Embodiment Construction

[0024] A transformer partial discharge detection method of the present invention is described in detail as follows in conjunction with the accompanying drawings and embodiments.

[0025] The invention discloses a transformer partial discharge detection method, comprising the following steps:

[0026] Step 1. Before the transformer is running, that is, when the transformer is not powered on, respectively detect the on-site noise level at the grounding cable of the transformer and the end screen of the bushing, and set the first trigger threshold and the second trigger threshold. The second trigger threshold can be the amplitude of the noise signal,

[0027] Step 2. When the transformer is running, that is, when the transformer is charged, the pulse current signal at the grounding cable of the transformer is detected by the first high-frequency current sensor installed at the grounding cable of the transformer, and the pulse current signal at the end screen of the transformer bu...

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Abstract

The invention belongs to the technical field of detection of transformers, relating to a partial discharge detecting method of a transformer, wherein the partial discharge detecting method comprises the five steps of setting triggering thresholds, comparing the thresholds to trigger an acoustic channel for collection, recording transmission time of ultrasonic signals, judging propagation paths and propagation speeds of the ultrasonic signals, and locating a partial discharge source. The partial discharge detecting method disclosed by the invention has the characteristics of being high in triggering and location precision and the like.

Description

technical field [0001] The invention belongs to the technical field of transformer detection, and in particular relates to a transformer partial discharge detection method. Background technique [0002] Partial discharge detection is an effective means for early detection of transformer partial discharge. [0003] Commonly used partial discharge detection methods include: pulse current method, ultra-high frequency method, and ultrasonic detection method. The pulse current method, as the longest-applied partial discharge detection method, has its own advantages in the detection and identification of partial discharges, but it cannot accurately locate partial discharges; Gas insulated switchgear (GIS) has a good effect; ultrasonic detection method is effective in partial discharge location, but has defects in partial discharge quantification and mode classification. [0004] The existing partial discharge acoustic-electric combination method uses four ultrasonic channels and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 贾琳张超
Owner 北京博电新能电力科技有限公司