Partial discharge (PD) can effectively reflect the insulation condition of hydro-generator unit,thus the state assessment of PD fault being significant to master the degree of insulation deterioration of hydro-generator unit.A state assessment model of PD based on the fuzzy comprehensive evaluation is established in this paper.Firstly the PD faults of the unit are divided into three kinds of state levels according to the actual operation of hydro-generator unit and discharge energy.Then with five statistical parameters of PRPD as the evaluation index,the state assessment model of PD fault of hydro-generator unit based on fuzzy comprehensive evaluation is established.Finally,the severity of the PD fault of the unit is evaluated according to the degree of membership.Example analysis result shows that the method can be used to evaluate the insulation condition of the unit by judging the state level of the PD fault of hydro-generator unit accurately and effectively,and that it has certain engineering practical value.%局部放电可以有效反映水轮发电机组的绝缘状况,因此对局部放电故障进行状态评估对掌握水电机组的绝缘劣化程度具有重要意义.本文建立了基于模糊综合评价的机组局部放电状态评估模型.首先根据水电机组的实际运行情况和放电能量,将机组的局部放电故障均划分为3种状态等级;然后以局部放电脉冲相位分布(PRPD)图谱的5个统计特征参数为评价指标,建立了基于模糊综合评价的水电机组局部放电状态评估模型;最后,根据得到的隶属度对机组局部放电故障的状态等级进行评定.实例分析结果表明,该方法能够准确、有效地判别水电机组局部放电故障的状态等级,从而实现对机组绝缘状况的准确评估,具有一定的工程实用价值.
展开▼
