TITLE:
The Research on Grounding Protection for 110kV Resistance Grounding Distribution System
AUTHORS:
Shan Sun, Guo Zeng, Xiaozang He, Yanping Lv, Xinyi Li
KEYWORDS:
Neutral Grounding System by Resistance; One-phase Grounding Fault; Zero Sequence Voltage; Zero Sequence Current; Protection Setting
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
November
11,
2013
ABSTRACT: Using the neutral grounding method by the resistance in
110kV system, it can limit the
voltage sag and short circuit current when one-phase grounding fault occurred,
but it will change the sequence of the network structure and parameters. This
paper analyzes the size and distribution of zero sequence voltage and current
when one-phase grounding fault occurred in the 110 kV resistance grounding
system, and puts forward the grounding protection configuration setting
principle of this system combining the power supplying characteristics of 110kV distribution network. In a reforming substation as an example,
the grounding protection of 110 kV lines and transformer have been
set and calculated.