Design of Grounding for High Voltage Test Hall

Tan Ying, Zhou Huili, Cheng Yexin
HIMALAYAL - SHANGHAI - CHINA

Abstract: To ensure the accuracy measurement of the high voltage test and the personal safety, it was demanding that the high voltage test hall should have a very good grounding system. The influence on the grounding resistance of the grounding grids area, the number of the horizontal grounding grids, the distance between the vertical grounding bodies and length of these bodies were systematically compared and analyzed. The idea that a compound grounding system should be installed for the high voltage test hall was pointed out. The horizontal grounding is the main part in the compound grounding system, which combined vertical grounding bodies. The problems and measures which should be noticed in the design of grounding system for the high voltage test hall were also put forward. 

Key words: high voltage test hall, grounding resistance, grounding measures

Introduction
The electric design of high voltage test hall is mainly involved in three aspects: grounding, shielding and safety. In terms of high voltage test, good grounding plays a role in sharing the voltage and fixing the potential.
The well-designed shielding system of high voltage test gall is vital to smooth operation of high voltage test hall. This paper discusses the design of the main grounding system.

1.Grounding System of High Voltage Test Hall 
The 1.4.1 term in the standard for national electric power industry DL 560-1995 Safety Code of Electric Power Industry (High Voltage test part) stipulates that the high voltage test hall should have a very good grounding system to ensure the accuracy measurement of the high voltage test and the personal safety. The grounding resistance should not be higher than 0.5Ω. Table 1 presents part of high voltage test grounding resistance at home and abroad.