Wei Shuai Qiuwei Zheng Ting Liu Bo Zhang Development and Application of Non-contact Voltage Detector with Metal Cover for UHV DC. 170-174 2022 EEET https://doi.org/10.1109/EEET58130.2022.00036 conf/eeet/2022 db/conf/eeet/eeet2022.html#ShuaiZLZ22