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Correlation analysis based on-load voltage regulating transformer tapping switch operating state judgment method

A voltage regulating transformer, correlation analysis technology, applied in the direction of instrument, circuit breaker test, mechanical component test, etc., can solve the problem of no effective means and so on

Active Publication Date: 2015-07-01
XISHUANGBANNA POWER SUPPLY BUREAU OF YUNNAN POWER GRID CO LTD +1
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  • Application Information

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Problems solved by technology

[0003] At present, the detection of the operation state of OLTC mainly judges whether it is running normally by testing its contact resistance, transition resistance, and switching time after power failure, but there is no effective means for the management of daily operation, especially for the online state

Method used

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  • Correlation analysis based on-load voltage regulating transformer tapping switch operating state judgment method
  • Correlation analysis based on-load voltage regulating transformer tapping switch operating state judgment method
  • Correlation analysis based on-load voltage regulating transformer tapping switch operating state judgment method

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Embodiment Construction

[0042] The present invention will be further described below in combination with the accompanying drawings and specific embodiments.

[0043] Take the correlation analysis of the monitoring indicators extracted from the vibration signal of the same gear switching and the current signal of the driving motor of a tap changer of an on-load tap changer as an example. Concrete implementation process is as follows according to the implementation steps of the present invention:

[0044] (1) By monitoring the vibration signal of the OLTC switching action (2 gear up to 3 gear) of this equipment and the current signal of the driving motor, the original graph is obtained as figure 1 As shown, it is processed to form an envelope graph such as figure 2 As shown, the monitoring indicators are extracted from the envelope graph: the duration of the driving motor current signal is 6.032s, and the driving motor current signal is in the stable power output stage (ie figure 2 The amplitude of...

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Abstract

The invention provides a correlation analysis based on-load voltage regulating transformer tapping switch operating state judgment method and belongs to the field of power system device monitoring. In online or offline monitoring data processing application of a drive motor current signal and an action vibration signal in the on-load voltage regulating transformer tapping switch action process of a power system, index quantities capable of reflecting the operating state of an on-load voltage regulating transformer tapping switch are selected, and index quantities different in dimension are subjected to mathematical expectation based standardization. A group of index quantities obtained through monitoring each time serve as a sample, a correlation coefficient and a partial correlation coefficient which serve as reference indexes for on-load voltage regulating transformer tapping switch operating state estimation are obtained to judge the normal operation degree and deterioration degree of a device through correlation analysis between the obtained sample and a normal sample and partial correlation analysis of any two attention samples in more than two groups of samples.

Description

technical field [0001] The invention relates to a method for judging the operating state of a tap changer of an on-load tap changer based on correlation analysis, and belongs to the technical field of power system equipment monitoring. Background technique [0002] The on-load tap changer is an effective device to ensure the quality of the power supply of the grid. It can contact the grid, stabilize the load center voltage, and adjust the power flow distribution of the grid. In the on-load tap changer, the tap changer (OLTC) is also a key device, and the fault occurs The rate is higher. In the operation and maintenance of the on-load tap changer, the main workload is also concentrated on the OLTC. The performance of OLTC includes two aspects: electrical performance and mechanical performance. The electrical performance mainly refers to the contact resistance of the contact. When the contact resistance of the contact increases, it will cause the contact to overheat or even b...

Claims

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Application Information

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IPC IPC(8): G01R31/327G01M13/00
Inventor 王开明束洪春董俊曹立平苏应敢何天金黄天义崔政刘楠彭玉林王浩兵
Owner XISHUANGBANNA POWER SUPPLY BUREAU OF YUNNAN POWER GRID CO LTD
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