基于紫外成像技术的极不均匀电场电晕放电.docxVIP

第32卷 第7期2006年7月高 电 压 技 术High Voltage EngineeringVol. 32 No.7July2006·13 ·基于紫外成像技术的极不均匀电场电晕放电马斌1 , 周文俊1 , 汪涛2 , 丁一工2(1.武汉大学电气工程学院,武汉430072;2.湖北省电力试验研究院,武汉430077)摘要:为监测电气设备外绝缘缺陷、灵敏观察和准确定位电晕放电,以紫外光谱特征量为量化电晕放电强度的 表征参数,以相同工频电压等级下的放电水平和电晕脉冲电流峰值作为量化比较参数,在基本相同的大气条件下,利用紫外成像技术试验研究了极不均匀电场工频电压下电晕放电。结果表明,电晕放电强度量化表征参数与量化 比较参数之间的对应关系很好;表征参数可反映电晕放电的几个阶段;结合紫外成像反映的放电形态,可分辨电晕 放电过程的各阶段 ,且紫外光谱特征量在电晕放电过程各阶段的分布具有一定的统计规律。最后提出选取流注放 电阶段的紫外光谱特征量交集作为空气间隙击穿的注意范围判据。关键词: 紫外成像技术; 工频电压; 极不均匀电场; 电晕放电; 流注放电中图分类号 : TM835文献标识码 :A文章编号 : 100326520 (2006)0720013204Corona Discharge of the Severe Non2unif orm ElectricFieldBased on the UV2l ight Imaging TechnologyMABin1 ,ZHOUWenjun1 ,WANGTao2 ,DINGYigong2(1 . School of Electrical Engineering , Wuhan U niversity , Wuhan 430072 , China; 2 . Hubei Electric Power Testing Research Instit ute , Wuhan 430077 ,China)Abstract : Corona discharge is being detected by UV2light imaging technology at home and abroad these years. Therearemany factorscausingcoronadischarge.Manyfactorsduringthedesign,manufacture,installation,operationandmaintenanceoftheelectricalequipmentswillcausedefectofexternalinsulation,whichresultsinelectricfieldcon2centrationandthephenomenonofcoronadischarge.ThephenomenonofdischargecouldbedetectedbytheUV2lightimagingtechnologymoresensitivelyandmoreconvenientlysothatthedischargepointscanbelocatedveryquicklyand exactly at field. The external insulation st ructure of the most electrical equipments in power system has thecharacteristic of the severe non2uniform electric field. The typical physical models are the rod2plate gap and therod2rodgap.Whiletheelectric fieldoftherod2rodgapismoreuniformthantherod2plategap(themaximume2lectricfieldintensityof theformerdispersesnearthetopof thebothrodelectrodes,andthatof thelatterconcen2tratestherodelectrodes).Therefore,inthestructuredesignsoftheexternalinsulationofHVelectricalequipmentsand the air gap , the rod2plate gap is considered as the physical model to ch