Method for multi-point calibration of apparent discharge of local discharge
A partial discharge and partial discharge technology, applied in the measurement of electrical variables, measuring electricity, measuring devices, etc., can solve the problems of poor equivalence of one point calibration method, large difference in attenuation of detection points, and partial discharge volume error.
Inactive Publication Date: 2019-09-03
HANGZHOU XIHU ELECTRONICS INST
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[0005] However, in the partial discharge test conducted by the whole power station or other large-scale electrical equipment assemblies, the attenuation difference of the signals from different discharge points propagating to the detection point is very different, and the equivalence of the one-point calibration method becomes worse. There is a large error
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[0020] 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.
[0021] like figure 1 As shown, the transformer is a three-phase power transformer including a high-voltage side, a medium-voltage side and a low-voltage side, and the high-voltage side is connected to the GIS, the medium-voltage side is connected to a transformer, and the low-voltage side is connected to a circuit breaker. Assuming that the tested product is GIS, then set multiple calibration points on both sides of the GIS, for example, select one calibration point on each side of the tested product, and record them as G1 and G2 respectively. At the same time, a point is selected on the high voltage side of the power transformer as a partial discharge detection point and marked as D, and a specific example of the present invention is...
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The invention discloses a method for multi-point calibration of apparent discharge of local discharge. The method comprises the following steps of 1, arranging n calibration points which are marked asA1-An respectively; and calibrating standard pulses with matched magnitude, which are respectively applied to the calibration points A1-An in an outage state, and recording a detection value of a partial discharge detection point and a calibration coefficient of the corresponding calibration point when each calibration point is calibrated; and 2, carrying out partial discharge detection on the high-voltage equipment at each side and a main transformer in an electrified state, and recording a numerical value of the partial discharge detection point; and meanwhile, selecting a partial dischargesource calibration point similar to the signal propagation characteristic according to a partial discharge source point, and computing relative accurate magnitude of partial discharge according to the calibration coefficient corresponding to the calibration point. According to the method, the equivalent degree of the calibration pulse and the partial discharge pulse of the discharge point on a sensor is improved, and the detection error is reduced, so that the partial discharge source calibration point similar to the signal propagation characteristic is found, and thus the detected apparent discharge is closer to the real magnitude of partial discharge.
Description
technical field [0001] The invention belongs to the technical field of high-voltage detection, and in particular relates to a method for multi-point calibration of the current discharge capacity of a local discharge TV. Background technique [0002] 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 the characteristics of partial discharge. [0003] At present, the confirmation of the apparent discharge amount of a specific partial discharge test requires the calibration of a standard pulse of a matching value in the test environment to determine the discharge amplitud...
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IPC IPC(8): G01R35/00G01R31/12
CPCG01R31/1227G01R35/005
Inventor 胡维兴刘晶张武波叶新林
Owner HANGZHOU XIHU ELECTRONICS INST