TITLE:
The Research of Voltage Sag and Power Frequency Overvoltage on 110kV Resistance Grounding System
AUTHORS:
Guo Zeng, Guangliang Feng, Yanping Lv, Shan Sun
KEYWORDS:
Neutral Grounding System by Resistance; One-phase Grounding Fault; Power Frequency Overvoltage
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
November
11,
2013
ABSTRACT: This paper researches the
voltage transfer characteristics when one-phase ground fault occurred in the
resistance grounding system, by using the theory of the asymmetric variable
characteristics and the sequence network analysis of the -11 transformer, and
concludes the scope of voltage sag and swell and the degree of power frequency
overvoltage and their influencing factors in the 110 kV resistance
grounding system. Accordingly this paper puts forward the resistance choosing
principle: the resistance grounding coefficient must be equal to or greater
than 10. So it can not only wipe out the voltage sag and voltage swell but
also make sure the overvoltage is limited to electrical equipment allowing
range. The method mentioned above is verified by simulation results of a 110 kV power
system in ATP.