Title :
Study on Resistance Grounded System of 110vK
Author :
Li Xiang ; Yanping Lv ; Biao Zhang ; Xiaomin Chen
Author_Institution :
Sch. of Electr. Eng., Wuhan Univ., Wuhan, China
Abstract :
Generally, neutrals of 110kv distribution system in China are directly grounded. When single phase-to-earth fault occures, there is a serious voltage sag in load side and the short-circuit current is very high, in some case it´s even higher than three-phase short-circuit current. 110kv resistance grounded system has been studied in this paper. Results show that this mode can inhibit the single-phase short-circuit current and reduce voltage sag of load side to improve power quality. The overvoltage level will not exceed the insulation level of existing electrical equipment if we reasonablely choose the value of neutral grounded resistance. PSCAD simulation has verified that.
Keywords :
CAD; overvoltage protection; power distribution; power supply quality; short-circuit currents; PSCAD simulation; electrical equipment; insulation level; overvoltage level; power distribution system; power quality improvement; resistance grounded system; serious voltage sag; short-circuit current; single phase-to-earth fault; three-phase short-circuit current; voltage 110 kV; Circuit faults; Grounding; Low voltage; Power transformer insulation; Resistance; Voltage control; Voltage fluctuations;
Conference_Titel :
Power and Energy Engineering Conference (APPEEC), 2012 Asia-Pacific
Conference_Location :
Shanghai
Print_ISBN :
978-1-4577-0545-8
DOI :
10.1109/APPEEC.2012.6307338
