基于HHT的局部放电在线监测与电缆安全的相关性研究  

Study on Online Detection of Local Discharge and Cable Safety Based on HHT

作　　者：田丰[1] 李钫 

机构地区：[1]河南机电高等专科学校电气系,副教授河南新乡453002 [2]河南省建设集团公司,高级工程师河南郑州450006

出　　处：《中国安全科学学报》2013年第7期38-42,共5页China Safety Science Journal

摘　　要：为对电缆易发生局部放电的缺陷位置实施动态监控,及时维护输配电线路,提高电缆运行安全,基于希尔伯特-黄转换(HHT)改善放电信号波形原理,通过包络线求值法,研制出以局部放电为对象的电缆在线监测系统。将所研制的新测试仪与常规测试仪的试验数据进行对比。结果表明,新测试系统能根据电缆局部放电波形图准确计算出电缆放电点的位置,进而对该放电点的电缆绝缘运行状态进行有效监测,判断电缆的剩余寿命,监测电网运行安全。In order to realize dynamic monitoring of cable defect position prone to local discharge,timely maintain transmission and distribution lines,and improve the safe operation of the cable,a cable online monitoring system was designed with local discharge as the object.In the system the way of envelope was used to calculate related data,the lock-in amplifier was used to remove complex environmental conditions to obtain local discharge signals,HHT was used to improve the discharge waveform and the relevant calculation programs were determined.The test data of new tester were compared with that of conventional testers.The results show that the cable discharge point position can be determined accurately by the test system via cable local discharge waveform.Thus the insulation operational status of the discharge point can be monitored effectively for the cable to determine the remaining life of the cable and the safe operation of power grid.

关 键 词：希尔伯特-黄转换(HHT) 局部放电 锁相放大器 在线监测 电缆安全 

分 类 号：X934[环境科学与工程—安全科学]