Voltage transformer on-line state monitoring and fault diagnosing method

Abstract

The invention discloses a voltage transformer on-line state monitoring and fault diagnosing method and relates to a voltage transformer state monitoring and fault diagnosing method. The method comprises the following steps: voltage transformer winding parameters are calculated via a microprocessor based on first to fourth high frequency discrete signals which are collected synchronously and a voltage transformer winding parameter calculating formula, the calculated voltage transformer winding parameters are output to a storage device, the detection result of all parameters is displayed on different display devices, and a voltage transformer state can be determined by workers and fault diagnosis can be realized according to obtained numeric values of the voltage transformer winding parameters and a fitting curve thereof. According to the voltage transformer on-line state monitoring and fault diagnosing method, actually measured electrical parameters are used for calculating resistance and reactance parameters of a voltage transformer winding in real time, and the method is based on a simple principle and can be realized conveniently.

Description

technical field [0001] The invention relates to a method for monitoring and diagnosing the state of a transformer, in particular to an online state monitoring and diagnosing method for a transformer. Background technique [0002] The power transformer is one of the important electrical equipment in the power system, and it undertakes the important responsibility of voltage conversion, power distribution and transfer in the power system. Since the rapid development of the power industry, the scale of the power system has gradually expanded, regional and even national large power grids have been gradually established, and the number of transformers at the core of the power transmission and distribution system has increased, and its importance has become increasingly prominent. Although there are relatively few transformer faults, once a large transformer fails, it will force the transmission network to cut off the ultra-high voltage or even ultra-high voltage circuit connected...

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Problems solved by technology

[0004] The parameters of the transformer equivalent circuit can be measured by circuit test and no-load test, but this type of method requires offline testing, the transformer must be disconnected from the grid, and abnormal signals during the operation of the transformer cannot be monitored.

Therefore, this type of off-line detection method cannot reflect the running state of the transformer winding in real time.

[0005] The most common method for on-line monitoring of transformer status is the frequency response method, but the existing frequency response method relies on injecting a high-frequency electrical signal into the primary side winding of the transformer, which will complicate the structure of the existing frequency response system and cause serious damage to the transformer. cause a certain impact

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