Title :
Overvoltages on distribution systems
Author :
Du, S. Lam ; Tran-Quoc, T. ; Huy, H. Vo V ; Nguyen-Boi, K. ; Nguyen, Q.
Author_Institution :
HCM City Electr. Co., Viet Nam
Abstract :
In the framework of live working in a MV network, a cable-transformer system can be switched-off or switched-on. The ferroresonance phenomenon can occur during this procedure with very dangerous overvoltages. The metal oxide varistor (MOV) can fail during this phenomenon. The paper investigates the determination of the critical feeder length of cable, which will damage MOVs. A transformer model taking into account both the saturation and the hysteresis is proposed. The digital simulation concerning de-energization of the real configuration of the cable-transformer system is studied and the results obtained are verified by field tests
Keywords :
arresters; ferroresonance; overvoltage protection; power cables; power distribution protection; power transformers; varistors; MV network; cable-transformer system; critical feeder cable length; de-energization; digital simulation; distribution system overvoltages; ferroresonance phenomenon; hysteresis; metal oxide varistor; surge arrester; transformer model; Arresters; Circuit breakers; Circuit faults; Cities and towns; Ferroresonance; Power cables; Power transformers; Saturation magnetization; Surges; Switching circuits;
Conference_Titel :
Power System Technology, 1998. Proceedings. POWERCON '98. 1998 International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-4754-4
DOI :
10.1109/ICPST.1998.728963
