Online power transformer fault positioning system based on ultra-high-frequency external sensors

Abstract

The invention provides an online power transformer fault positioning system based on ultra-high-frequency external sensors. The system comprises three casing ultra-high-frequency partial discharge sensors respectively used for receiving electromagnetic wave signals produced by a discharge fault point, an oil valve ultra-high-frequency partial discharge sensor used for receiving an electromagnetic wave signal produced by the discharge fault point, and a high-speed acquisition system used for recording pulse sequences corresponding to the electromagnetic wave signals respectively received by the three casing ultra-high-frequency partial discharge sensors and the oil valve ultra-high-frequency partial discharge sensor, and calculating based on a hyperbolic positioning method according to the pulse sequences to obtain the position of the discharge fault point. The casing ultra-high-frequency sensors and the oil valve ultra-high-frequency sensor are matched and can be conveniently installed on site, and are highly sensitive to discharge fault point detection.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to an online fault location system for power transformers based on UHF partial discharge. Background technique [0002] When partial discharge occurs inside the power transformer, it will stimulate the generation of ultra-high frequency electromagnetic wave signals. Due to the complexity of the transformer insulation structure, the path of electromagnetic waves propagating from the discharge point to the UHF sensor is uncertain, and may encounter transformer oil, oil-paper insulation or metal conductors. In this way, when the electromagnetic wave propagates therein, multiple refractions and attenuation will occur, thereby increasing the difficulty of detecting the electromagnetic wave. Therefore, it is very necessary to conduct in-depth theoretical analysis and experimental research on the propagation mechanism of UHF electromagnetic waves generated by partial discharge, wh...

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Problems solved by technology

[0005] In the process of realizing the present invention, the inventor found that the disadvantages of similar products in the same industry are: in the past, most similar products used ultrasonic positioning methods, which resulted in low on-site detection sensitivity and large interference; or required the installation of 4 built-in UHF sensors, and most of the transformers did not have On-site installation conditions, inconvenient to install on-site

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