Distributed power transformer winding state monitoring method and system based on vibration method

Abstract

The invention discloses a distributed power transformer winding state monitoring method and system based on a vibration method. A vibration acquisition unit is installed beside a transformer by adopting a distributed architecture to obtain a vibration signal, and the vibration signal is sent to an upper computer through an optical fiber after analog-to-digital conversion; a current and voltage acquisition device is installed at a secondary terminal of a transformer to acquire a current signal and a voltage signal, the current signal and the voltage signal are sent to the upper computer through an optical fiber after analog-to-digital conversion, the upper computer sends a clock synchronization command to the vibration acquisition unit and the current and voltage acquisition unit, the acquired information is processed and analyzed through a built-in algorithm model, and the health state of the winding is judged. By collecting and transmitting the signals in the mode, the problems of amplitude attenuation and electromagnetic interference caused by direct transmission of electric signals can be effectively avoided, and meanwhile, the synchronism of remote signal sampling is also ensured. The system is low in coupling degree and high in expandability, and can be applied to various occasions such as transformer substations and test rooms.

Description

technical field [0001] The invention belongs to the technical field of power transformer fault diagnosis, and more specifically relates to a method and system for monitoring the winding state of a distributed power transformer based on a vibration method. Background technique [0002] The vibration method is a method to judge the health status of the internal winding by collecting the vibration information of the transformer box wall, which has the characteristics of high detection efficiency and high detection accuracy. [0003] In the prior art, the transformer vibration adopts an integrated vibration acquisition device, which mainly uses the existing highly integrated signal acquisition board on the market, and directly acquires the vibration signal value of the transformer box wall through the vibration sensor. In the actual measurement in the substation, because the vibration signal is relatively weak, the vibration signal collected by the sensor will be attenuated to a...

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Problems solved by technology

In the actual measurement in the substation, because the vibration signal is relatively weak, the vibration signal collected by the sensor will be attenuated to a certain extent after long-distance transmission to the acquisition device. In addition, the electromagnetic pollution in the substation is relatively serious, and the signal transmission process is vulnerable to external electromagnetic waves The influence of interference, resulting in the distortion of the collected vibration signal

In addition, the speed and accuracy of the acquisition device are also restricted by the performance of the board itself. For the high-frequency vibration components generated when the transformer is abnormally operating, problems such as sampling omissions will occur due to insufficient accuracy.

At the same time, the change of current and voltage is the direct cause of transformer vibration, but the acquisition of voltage and current signals is generally located at the secondary terminal in the substation and distributed in different places from the transformer body. It cannot meet the requirement of obtaining transformer vibration signals and voltage and current signals at the same time. If the electrical recording signals of other equipment in the substation are used, there will be a problem of asynchrony with the vibration signals, which will affect the analysis of vibration signals.

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