Optimal arrangement method of UHF phased array used for substation partial discharge direction finding

Abstract

The invention discloses an optimal arrangement method of an UHF phased array used for substation partial discharge direction finding. The optimal arrangement method comprises the steps of: 1) making a number of array elements and array element spacing of the phased array unchanged, deriving Cramer-Rao low bound expressions in different geometric shapes, and optimizing a geometric shape of the UHF phased array; 2) making array element spacing of the phased array after geometric shape optimization unchanged, drawing a relation curve between direction finding errors and the number of array elements in numerical simulation, and optimizing the number of array elements of the UHF phased array by combining with a construction cost of an acquisition system; 3) and acquiring partial discharge signals in a substation for the phased array after geometric shape and array element number optimization, analyzing frequency spectra of the signals, and optimizing array element spacing of the UHF phased array. The optimal arrangement method adopts the UHF phased array which is small in size, has the advantages of high anti-interference ability and high spatial resolution, and is convenient for partial discharge patrol inspection.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of partial discharge detection, and in particular relates to an optimal layout method of a UHF phased array used for partial discharge direction measurement in substations. [0003] Background technique: [0004] Partial discharge is not only the main cause of insulation failure of power equipment, but also an important symptom and detection method of insulation defects. The UHF method is a partial discharge monitoring method with good anti-interference performance, high sensitivity and the ability to locate the discharge source. It has been generally recognized at home and abroad in recent years. At present, partial discharge detection in substations is aimed at important power equipment such as gas-insulated combined electrical equipment, transformers, etc., and sensors are usually installed on a single device, but the detection of secondary equipment such as current transformers is not enough. For...

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Problems solved by technology

Among the various layout methods, the uniform linear array has the advantages of simple structure and small amount of calculation, but it can only estimate the azimuth angle, and the direction finding accuracy is greatly affected by the azimuth angle, so it is difficult to apply to substation partial discharge direction finding. Certain limitations; the planar array can estimate the pitch angle and azimuth angle of the partial discharge signal at the same time, but its direction finding accuracy is affected by factors such as the geometry of the array, the number of array elements, and the spacing between array elements. At present, relevant research work at home and abroad has not yet expand in depth

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