开关柜局部放电超声-TEV融合检测技术  

Ultrasonic-TEV Combined Detection Technology of Partial Discharge in Switchgear

作　　者：孙源 宋颜峰 王昊天 侯嘉琛 韩旭涛 李军浩[1] SUN Yuan;SONG Yanfeng;WANG Haotian;HOU Jiachen;HAN Xutao;LI Junhao(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学电工材料电气绝缘国家重点实验室,西安710049

出　　处：《高电压技术》2023年第12期5052-5060,共9页High Voltage Engineering

基　　金：国家自然科学基金联合基金重点项目(U22B20118)。

摘　　要：开关柜是电力系统的重要组成设备,其在出厂和长期运行中不可避免地会出现绝缘缺陷,导致设备故障。局部放电检测是发现开关柜绝缘缺陷的有效手段,为了提高开关柜局部放电检测的灵敏度,提出了超声–暂态对地电压(transient earth voltage,TEV)融合传感技术并设计了融合传感器,实现了超声信号与TEV信号在时空上的同步测量。对融合传感器的校准试验结果表明,超声的平均灵敏度在20~60 kHz内为63.90 dB;TEV的平均灵敏度在1~40 MHz内为46.98 d B,满足开关柜局部放电检测需求。在10 k V开关柜上进行了基于缺陷模型的局部放电试验,结果表明,该文提出的融合传感技术在准确测量局部放电信号的同时可以准确地实现放电定位,为开关柜局部放电检测提供了新的思路与方案。Switchgear is an important component of power system,and insulation defects will inevitably appear in its delivery and long-term operation,facilitating the failure of equipment.Partial discharge detection is an effective method to detect the insulation defects of switchgear.In order to improve the sensitivity of partial discharge detection in switch-gear,this paper proposes the ultrasonic-TEV combined sensing technology and designs the combined sensor,which realizes the synchronous measurement of ultrasonic signal and TEV signal in space and time.The calibration test results of the combined sensor show that the average sensitivity of ultrasound is 63.90 dB within 20~60 kHz,and the average sensitivity of TEV is 46.98 dB within 1~40 MHz,which meet the requirements of partial discharge detection in switch-gear.Partial discharge tests based on a defect model were carried out on 10 kV switchgear.The results show that the combined sensing technology proposed in this paper can accurately locate the discharge while accurately measuring the partial discharge signal,which provides a new idea and scheme for partial discharge detection in switchgear.

关 键 词：局部放电 高压开关柜 超声 暂态对地电压 融合传感器 

分 类 号：TM591[电气工程—电器] TM855