Partial discharge failure probability characterization method for insulating paperboard based on double risk competition

Abstract

The invention discloses a method for characterization of partial discharge failure probability of oil-immersed insulating cardboard based on a double-risk competition model. Under a certain applied voltage amplitude, partial discharge treatment is performed on a plurality of oil-immersed insulating cardboard samples, and the self-partial discharge of each sample is recorded. The time required from the start to the breakdown of the cardboard and the number of partial discharges during this time, and then use the three-parameter Weibull distribution to fit the above two variables respectively, and finally use the double risk competition model to calculate the oil-immersed insulation considering the time and the number of discharges Cardboard dual-risk competing insulation failure probability model with visual representation. The invention comprehensively considers the insulation failure time and the number of insulation failure discharges, and predicts the insulation failure probability of oil-immersed insulating cardboard under the action of partial discharge from the perspective of double-risk competition, and can effectively and comprehensively calculate the oil-immersed insulation under the action of partial discharge. Cardboard insulation failure probability, avoiding the one-sidedness of univariate models.

Description

technical field [0001] The invention belongs to the technical field of high voltage and insulation, and relates to a method for evaluating the insulation state of oil-immersed insulating paperboard, in particular to a method for characterization of partial discharge failure probability of insulating paperboard based on double-risk competition. Background technique [0002] With the continuous expansion of my country's power grid, the amount of oil-immersed electrical equipment continues to increase, but at the same time, the proportion of oil-immersed electrical equipment failures caused by partial discharge is also increasing year by year. The main insulating material of oil-immersed electrical equipment is oil-impregnated insulating cardboard. During the operation of the equipment, the cardboard needs to withstand high voltage. Although sufficient electrical strength has been left in the structural design, accidental factors in the material manufacturing process will Some ...

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Problems solved by technology

[0005] Aiming at the one-sided problem in the prior art that only one variable is used to estimate the failure probability of oil-impregnated insulating paperboard under the action of partial discharge, the purpose of the present invention is to provide a method for characterization of partial discharge failure probability of insulating paperboard based on double-risk competition, and at the same time Based on the failure time of oil-impregnated insulating paperboard under partial discharge and the probability distribution of failure discharge times, a double-risk competition model for oil-impregnated insulating paperboard is proposed to predict the failure probability of oil-impregnated insulating paperboard under partial discharge.

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