Calibration and positioning method for substation area partial discharge detection

Abstract

The invention discloses a calibration and positioning method for substation area partial discharge detection. The method comprises the following steps: firstly, a calibration point and a partial discharge detection point are calibrated in a power failure state, and detection values of the partial discharge detection point and the calibration point are recorded; secondly, a PC terminal records datain the calibration process to form a database of apparent discharge capacity; then, in an electrified state, partial discharge detection is carried out on high-voltage equipment and a main transformer on each side, a bushing tap is coupled to a partial discharge signal, and a numerical value detected by a partial discharge detection point is recorded; and finally, the PC terminal compares the data ratio of partial discharge detection with a plurality of pieces of data detected during calibration, selects one piece of data closest to the change rule of the ratio from the apparent discharge capacity database according to the corresponding proportional relation, and calculates the most possible source point of partial discharge. By adopting a multi-point calibration mode, the influence of signal attenuation caused by distance is reduced, the partial discharge position can be found more accurately, and the relatively accurate partial discharge amount can be calculated.

Description

technical field [0001] The invention belongs to the technical field of high-voltage detection, and in particular relates to a calibration and positioning method for partial discharge detection in a station domain. Background technique [0002] The power transformer is the core electrical equipment in a high-voltage power station. The inlet and outlet bushings on each side are directly connected to high-voltage electrical equipment such as circuit breakers, disconnectors, transformers or GIS through busbars. [0003] Excellent insulation performance is the basic condition for the normal operation of high-voltage equipment and even the power grid system. Insulation deterioration or failure of insulation capacity is one of the main reasons for the failure of high-voltage electrical equipment and power grid systems. It has been recognized by the industry as the most sensitive and effective means to reflect the insulation state of high-voltage electrical equipment by detecting th...

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Problems solved by technology

[0005] However, in the partial discharge test carried out by the whole power station or other large-scale electrical equipment assemblies, due to the signal attenuation caused by distance, the equivalence of the one-point calibration method becomes worse, and the location of the source of the partial discharge signal cannot be accurately judged. There is a large error in the partial discharge amount

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