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Detection method of direct-current bias in transformer

A detection method, DC bias technology, applied in the detection field, can solve problems such as bad influence of transformer and power grid, aggravation of noise and vibration and other damages, failure of DC bias diagnosis, etc.

Inactive Publication Date: 2018-01-09
SIEMENS TRANSFORMER GUANGZHOU
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  • Claims
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Problems solved by technology

DC bias is an abnormal working state of the transformer, which may have adverse effects on the transformer and the power grid, such as increasing the iron loss and copper loss of the transformer, aggravating noise and vibration, and other damages
[0003] At present, the noise and / or vibration of the transformer can be used to judge whether the DC bias has occurred in the transformer, but these methods will be affected by the outside world and cannot accurately diagnose the DC bias

Method used

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  • Detection method of direct-current bias in transformer
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  • Detection method of direct-current bias in transformer

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Embodiment Construction

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific embodiments of the present invention are now described with reference to the accompanying drawings, in which the same reference numerals represent components with the same or similar structures but the same functions.

[0032] In this article, "schematic" means "serving as an example, example or illustration", and any illustration or implementation described as "schematic" should not be interpreted as a more preferred or more advantageous Technical solutions.

[0033] figure 1 Schematic illustration of the device used to detect DC bias in a transformer. Such as figure 1 As shown, before acquiring the signal, three vibration sensors 10 are arranged on the outer surface of the side wall 22 of the oil tank 20 of the transformer, not limited to this, and then use a computer 30 and / or a mobile terminal such as a mobile phone 40 to communicate with each vi...

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Abstract

The invention relates to a detection method of direct-current bias in a transformer. The method comprises following steps of signal acquisition (S52), signal processing (S54) and judging (S56). The signal acquisition step comprises the step of acquiring a vibration signal of a fuel tank of the transformer. The signal processing step comprises steps of forming a time domain waveform of the vibration signal (S542); carrying out frequency domain decomposition on the time domain waveform so as to transform the time domain waveform into a frequency domain waveform (S544); and calculating an amplitude of each odd number frequency and an amplitude of each even number frequency of the frequency domain waveform (S546). The judging step comprises the step of determining that there is direct-currentbias in the transformer if the amplitude of one odd number frequency is larger than half of the amplitude of one odd number frequency. According to the invention, the detection method is low in detection cost, safe, fast in speed and high in accuracy.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for detecting DC bias magnetism in a transformer. Background technique [0002] DC bias refers to the fact that external DC or near DC enters the transformer coil to excite the transformer, resulting in magnetic saturation of the transformer core in half a cycle, and a series of electromagnetic effects caused by it. DC bias is an abnormal working state of the transformer, which may have adverse effects on the transformer and the power grid, such as increasing the iron loss and copper loss of the transformer, aggravating noise and vibration, and other damages. [0003] At present, it is possible to judge whether a DC bias occurs in a transformer through the noise and / or vibration of the transformer, but these methods are subject to external influences and cannot accurately diagnose the DC bias. Contents of the invention [0004] The object of the present invention is to provide a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01N29/14G01N29/4436G01N29/46G01R31/62
Inventor 李林达樊兴华司代均
Owner SIEMENS TRANSFORMER GUANGZHOU
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