A Partial Discharge Online Monitoring and Early Warning Method
A partial discharge, monitoring and early warning technology, applied in the direction of testing dielectric strength, etc., can solve the problems of high-voltage equipment status warning false alarm, false alarm, etc., to achieve the effect of improving accuracy and usability, and large-scale field engineering application value
Active Publication Date: 2018-08-03
XUJI GRP +3
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[0005] The purpose of the present invention is to provide a partial discharge on-line monitoring and early warning method to solve the problem of false positives or missed negatives in the high voltage equipment state early warning in the prior art
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[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0026] Such as figure 1 As shown, the partial discharge online monitoring and early warning method of the embodiment of the present invention includes the following steps:
[0027] (1) For the discharge intensity point at the current moment, count the partial discharge discharge intensity data of the same phase in the previous period of time, and remove the interference signal;
[0028] For the discharge intensity point at the current moment, the partial discharge discharge intensity data of the same phase in the previous period of time are counted. Since the partial discharge signal has phase correlation, the interference signal is removed by judging whether the discharge intensity at a certain phase is always greater than a set threshold, and the set threshold is set according to the actual situation. At the same time, if a certain type of discharge can b...
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The invention relates to a partial discharge on-line monitoring and early-warning method, and the method comprises the steps: (1) carrying out the statistics of discharge intensity data of partial discharge of the same phase within one time period before a discharge intensity point at a current moment, and eliminating an interference signal; (2) carrying out the physical statistics of the discharge intensity data of partial discharge with the time period, calculating the mean value X and standard deviation sigma of the discharge intensity data of partial discharge, and calculating at least one confidence interval of partial discharge early warning; (3) solving the discharge intensity change rate of a discharge intensity point; (4) comparing the discharge intensity point with an early-warning confidence interval, comparing the discharge intensity change rate with an early-warning change rate threshold value, and determining an early-warning state: determining the early-warning state as an early-warning state when the discharge intensity is out of the early-warning confidence interval and the discharge intensity change rate is greater than the early-warning change rate threshold value; and determining the early-warning state as a normal state at other states. The method greatly improves the accuracy and availability of partial discharge on-line monitoring early warning.
Description
technical field [0001] The invention belongs to the field of intelligentization of high-voltage equipment, and in particular relates to an on-line partial discharge monitoring and early warning method. Background technique [0002] Under the action of high voltage and high electric field, discharge, electromagnetic force, thermal stress, hot and humid environment, harmful active gas, oil pollution, dust, etc. during the operation of electrical equipment will cause the gradual deterioration of the performance of insulating materials. At the same time, this deterioration is Irreversible and constantly accelerating. Therefore, partial discharge will occur in some weak links of insulation in high-voltage equipment under the action of local high electric field. The power transmission line is one of the important parts of the power system. The quality of its line insulation directly affects whether the power system can operate safely. Once a fault occurs, a large-scale power outa...
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IPC IPC(8): G01R31/12
Inventor 雍明超路光辉王伟杰周水斌龚东武庄益诗周钟牧继清郭旭梁武民曾国辉吕侠王胜辉王龙阁卢声
Owner XUJI GRP