Partial discharge detection system for transformer slot leak electromagnetic waves and method

Abstract

The invention discloses a partial discharge detection system for transformer slot leak electromagnetic waves and method. The system is composed of a signal source generation device arranged inside thetransformer for generating electromagnetic waves, an electromagnetic wave receiving device arranged in the slot of the transformer for receiving the electromagnetic waves, and a data acquisition device connected with the electromagnetic wave receiving device for acquiring electromagnetic wave signals received by the electromagnetic wave receiving device. In the method, a PD pulse source is adjusted through a control device to output PD pulse signals, electromagnetic wave signals in or inside the power transformer slot are acquired through an antenna sensor and an oscilloscope, and thus, detection on the transformer slot leak electromagnetic waves is completed. The power transformer slot leak PD electromagnetic wave signals can be effectively detected, and a strong support is provided forresearch on an electromagnetic wave distribution law in (inside) the transformer slot.

Description

technical field [0001] The invention relates to the technical field of transformer partial discharge electromagnetic wave detection, in particular to a partial discharge detection system and method for transformer gap leakage electromagnetic waves. Background technique [0002] Power transformers are expensive and are the core of power transmission and distribution in power systems, and the insulation status is the core that determines whether power transformers can operate normally. Partial discharge (PD) is the main cause of insulation defects in power transformers, and it is also the main manifestation of insulation defects. UHF electromagnetic wave partial discharge detection method is a detection method with high reliability, high sensitivity and strong anti-interference ability. It has been widely used in the field of partial discharge defect monitoring of power transformers. [0003] At present, the antenna sensor in the power transformer PD ultra-high frequency elec...

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Problems solved by technology

The built-in antenna can effectively shield the electromagnetic interference in the surrounding environment, but there are two problems: ①The built-in antenna will change the internal structure of the transformer, which may destroy the uniform distribution of the electromagnetic field inside the transformer; ②For the transformer in operation, the power company does not allow transform it

[0005] Although the method of detecting partial discharge inside the transformer by detecting the PD electromagnetic wave signal leaked by the gap has been applied to a certain extent, the propagation characteristics of the electromagnetic wave in the gap (inside) are mainly studied through simulation, and there is no method for detection through experiments. Carry out research on the energy distribution in the gap (inside), mainly because the size of the antenna sensor used for PD UHF detection of power equipment is relative to the depth of the gap in the power transformer (the depth of the gap in the 750kV power transformer is about 15cm-18cm) , the size of the two is almost the same, and the performance of the antenna sensor is greatly affected by the surrounding metal. When the depth of the antenna sensor inserted into the gap is different, the performance of the antenna sensor will also change greatly, resulting in the existence of bivariate, unable to Experimental research on the distribution characteristics of electromagnetic wave energy in the gap by adjusting the depth of the antenna sensor inserted into the gap of the power transformer

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