Transformer local discharging ultra-wide band sensor array positioning system and method thereof

Abstract

This is a transformer local discharge ultrawide-band sensor array orientation system. Four elements ultrawide-band RF sensor arrays are micro size wide-band antenna and their designed upper limit frequency isn't lower than 6 GHz. The elements aren't in one circumcircle and the space between of element isn't smaller than 80cm. Set each group of sensor array at both side of the transformer iron core. Respectively connect the feeder to the four ultrawide-band amplifiers of 1GHz-6GHz by same length and low wastage high frequency RF cable, and the export ending of amplifier connects to the high-speed collecting figure oscillograph. Test the arriving time difference of the element test single with the others by the sensor array to find the position of the transformer local discharge radiant point. The orientation system and method adopt the existing instrument and achieve the veracious orientation and can be used on line.

Description

technical field [0001] The invention belongs to the technical field of on-line detection of power transformers, in particular to a transformer partial discharge ultra-wideband sensor array positioning system and a method thereof. A system and method for detecting partial discharge of a power transformer using a plurality (two or more) of planar (or near-planar) radio frequency sensor arrays arranged in different circumscribed circles. Background technique [0002] With the development of the national economy, the requirements for the reliable operation of the power system are getting higher and higher, and the power transformer is the key equipment of the power system, and its operation reliability is directly related to the safety and stability of the power system. Statistical analysis of actual faults shows that insulation faults are the main reason affecting the normal operation of transformers, and partial discharge is an important cause of insulation faults. [0003] A...

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Problems solved by technology

At present, some people have proposed the idea of ​​locating the partial discharge of power transformers based on the principle of the shortest optical path. The delay measurement is inaccurate, and the delay measurement error is even as high as several nanoseconds or more. For the localization of transformer partial discharge, it is required to locate centimeter-level faults within a few meters of space. Considering that electromagnetic waves propagate at close to the speed of light and In other words, the resulting positioning error is extremely large (even up to several meters), so it is difficult to accurately locate the partial discharge of the transformer directly based on the principle of the shortest optical path

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