A method for judging the running state of on-load tap-changer tap-changer based on correlation analysis

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: 2018-03-06
XISHUANGBANNA POWER SUPPLY BUREAU OF YUNNAN POWER GRID CO LTD +1
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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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  • A method for judging the running state of on-load tap-changer tap-changer based on correlation analysis
  • A method for judging the running state of on-load tap-changer tap-changer based on correlation analysis
  • A method for judging the running state of on-load tap-changer tap-changer based on correlation analysis

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Embodiment Construction

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

[0043] Take the correlation analysis between the vibration signal and the monitoring index extracted from the current signal of the driving motor during a period of time in the tap switch of an on-load tap changer. The specific implementation process The implementation steps according to the present invention are as follows:

[0044] (1) By monitoring the vibration signal of the OLTC switching action (2 gears to 3 gears) and the current signal of the drive motor, the original graphics such as figure 1 As shown, after processing it to form an envelope figure such as figure 2 As shown, the monitoring index is extracted from the envelope graph: the duration of the driving motor current signal is 6.032s, and the driving motor current signal is stable at the power output stage (ie figure 2 The amplitude of the range 1) is 1.876A, and the spring energy storage stage...

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Abstract

The invention provides 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 field of power system equipment monitoring. In the online or offline monitoring data processing application of the drive motor current signal and the action vibration signal during the operation of the on-load tap changer tap changer in the power system, select the index quantity that can reflect the operation status of the on-load tap changer tap changer , standardize the indicators of different dimensions based on the mathematical expectation value; take a set of indicators obtained from each monitoring as a sample, through the correlation analysis between the collected samples and normal samples, and a certain two in more than two groups of samples Partial correlation analysis between two concerned samples, the correlation coefficient and partial correlation coefficient are obtained as reference indicators for evaluating the operation status of on-load tap changer tap-changers, and judging whether the equipment is running normally or not and the degree of deterioration.

Description

Technical field [0001] The invention relates to a method for judging the operating state of an on-load tap changer transformer based on correlation analysis, and belongs to the technical field of power system equipment monitoring. Background technique [0002] The on-load tapping transformer is an effective device to ensure the quality of power supply to the power grid. It can contact the power grid, stabilize the load center voltage, and adjust the power flow distribution of the grid. In the on-load tap changer transformer, the tap changer (OLTC) is the key device and the fault occurs The rate is higher. In the operation and maintenance of on-load tapping transformers, the main workload is also concentrated on the OLTC. The performance of OLTC includes electrical performance and mechanical performance. 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 and eve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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