Condition monitoring method and device for windings of power transformer

A technology for power transformers and windings, applied in measuring devices, instruments, using ultrasonic/sonic/infrasonic waves, etc., can solve problems such as inability to achieve online monitoring

Active Publication Date: 2014-09-10
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, this application provides a method and device for monitoring the state of a power transformer winding, to solve the problem that the existing monitoring method cannot realize online monitoring

Method used

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  • Condition monitoring method and device for windings of power transformer
  • Condition monitoring method and device for windings of power transformer
  • Condition monitoring method and device for windings of power transformer

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Embodiment Construction

[0088] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0089] see figure 1 , which shows the flow of a method for monitoring the state of a power transformer winding provided by an embodiment of the present invention. The method is applied to a running power transformer, and at least two Vibration sensors such as figure 2 As shown, the power transformer includes three windings, and each winding corresponds to two vibration sensors. Specifically, winding A corresponds to vibration sensors #1 and #2, and winding B...

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Abstract

The invention provides a condition monitoring method for windings of a power transformer. The method is applied to the power transformer which operates currently. Multiple vibrating sensors are arranged on the power transformer and used for collecting multiple sets of vibration signals of the windings in the power transformer within a preset time period, vibration amplitudes of preset base frequencies in all target vibration signals in each set of vibration signals are extracted, winding vibration variations between every two adjacent vibration amplitudes in each set of vibration amplitudes are obtained, a vibration correlation model is generated according to the winding vibration variations, and then principal component analysis is carried out on the vibration correlation model so that the conditions of the windings of the power transformer can be determined. Compared with the prior art, the conditions of the windings can be obtained by collecting and analyzing vibration data of the power transformer in the normal operation process without the need of stopping operation of the power transformer, on-line monitoring is achieved, and influences on operation of a whole electric system are small.

Description

technical field [0001] The present application relates to the technical field of power transformer fault detection, in particular to a method and device for monitoring the state of a winding state of a power transformer. Background technique [0002] The power transformer is an important equipment in the power system. It is connected to the power plant and the substation, which can increase the voltage to send the electric energy to the power consumption area, and can also reduce the voltage to the usable voltage at all levels to meet different power consumption requirements. need. If the power transformer fails, it will interrupt the transmission network and cause serious economic losses and serious social impact. Therefore, it is necessary to monitor the power transformer to detect and eliminate faults in time to ensure the normal operation of the power system. [0003] Transformers include windings and iron cores, among which winding failures are more frequent and more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B17/04
Inventor 周建平林磊吴锦华黄海姚晖洪凯星何文林杨松伟吴劲晖诸立波
Owner STATE GRID CORP OF CHINA
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