Design and testing of a high-precision generating voltmeter for metal-enclosed megavolt level DC voltage source

Xiaoang Li; Shuxiao Wang; Xiaoxiao Lv; Zhipeng Zhang; Yikai Shao; Zhibing Li; Qiaogen Zhang

doi:10.1063/5.0190171

Design and testing of a high-precision generating voltmeter for metal-enclosed megavolt level DC voltage source

Rev Sci Instrum. 2024 Apr 1;95(4):045008. doi: 10.1063/5.0190171.

Authors

Xiaoang Li¹, Shuxiao Wang¹, Xiaoxiao Lv¹, Zhipeng Zhang¹, Yikai Shao¹, Zhibing Li², Qiaogen Zhang¹

Affiliations

¹ State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Institute of High Voltage Technology, Xi'an Jiaotong University, Xi'an 710049, China.
² Institute of High Voltage Technology, China Electrical Power Research Institute, Beijing 100192, China.

PMID: 38668694
DOI: 10.1063/5.0190171

Abstract

An extremely stable megavolt (MV) level DC voltage source is the key foundation for many scientific instruments, and the need for accurate measurement and long-term real-time monitoring of its output voltage is increasingly urgent. The utilization of conventional resistive voltage dividers for measurements introduces leakage currents, resulting in considerable measurement errors. The non-contact generating voltmeter (GVM) sensor based on electric field measurement has a simple structure and a low cost, making it expected to be an effective solution. Currently, most research on GVM sensors focuses on the measurement of weak electric fields at kV/m levels with significant interference. In this paper, an improved high-precision non-contact GVM sensor was designed. A DC voltage test platform was built, and the effects of the sampling resistor and motor rotation speed on the measurement results were discussed. The relative combined uncertainty of the improved GVM sensor reached 0.042%, which satisfied the urgent need for MV level DC voltage source measurement. The improved GVM sensor can provide an effective reference for measuring the output voltage of a metal-enclosed MV level DC voltage source or the potential of a suspended electrode.