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

Abstract

The invention relates to a transformer partial discharge ultra-wideband sensor array positioning system, which is composed as follows: a 4-element ultra-wideband radio frequency sensor array, which is a miniature broadband antenna, and its design upper limit frequency is not lower than 6GHz, and the layout of the sensor array requires that each array element is not in On the same circumscribed circle, the distance between the array elements is not less than 80cm. At least one set of sensor arrays is installed on both sides of the transformer core, and the feeders are respectively connected to four 1GHz-6GHz ultra-wideband amplifiers with equal-length low-loss high-frequency radio frequency cables. , the output of the amplifier is connected to a high-speed acquisition digital oscilloscope. The sensor array on the direct wave side is used for detection; the arrival time difference of other array elements relative to the detection signal of this array element is measured, and the position of the partial discharge radiation source of the transformer is obtained. The positioning system and its method adopt the existing stereotyped instruments and equipment, and the positioning is accurate and reliable, and can be measured 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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