A calibration and positioning method for partial discharge detection in station area
A technology of partial discharge detection and positioning method, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of poor equivalence, partial discharge volume error, and inability to accurately determine the source position of partial discharge signals, etc. Achieve the effect of improving the equivalence degree and reducing the detection error
Active Publication Date: 2022-05-13
HANGZHOU XIHU ELECTRONICS INST
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[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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[0027] The present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that the described embodiments are only for understanding of the present invention, and do not limit it in any way.
[0028] In practical applications, for example, in the partial discharge test of the whole power station or other large electrical equipment assemblies, you can choose to inject standard pulses into multiple points on the main transformer or other large electrical A high-frequency sensor is added to the end screen of the bushing to couple and pick up the partial discharge signals of the transformer itself or high-voltage electrical equipment on each side.
[0029] In a high-voltage power station, the core electrical equipment is a power transformer, and 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.
[0...
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The invention discloses a calibration and positioning method for station area partial discharge detection. Steps of the present invention: firstly, in the power failure state, respectively calibrate the calibration point and the partial discharge detection point, and record the detection value of the partial discharge detection point and the calibration point; secondly, the PC end records the data in the calibration process to form a visual In the database of the discharge amount; then in the charged state, carry out partial discharge detection on the high-voltage equipment on each side and the main transformer, the end screen of the bushing is coupled to the partial discharge signal, and record the value detected by the partial discharge detection point; finally, the PC terminal will The data ratio of partial discharge detection is compared with multiple data detected during calibration, and the most likely source point of partial discharge is calculated by selecting a piece of data that is closest to the change rule of the ratio from the apparent discharge database according to the corresponding proportional relationship. The invention adopts a multi-point calibration method to reduce the influence of signal attenuation caused by distance, and can more accurately find the partial discharge position and calculate a relatively accurate partial discharge amount.
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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IPC IPC(8): G01R35/00G01R31/12
CPCG01R35/005G01R31/1227
Inventor 张武波叶新林王俊肖洪亮亮
Owner HANGZHOU XIHU ELECTRONICS INST