Title :
Limiting the number of the most severe voltage sags in rural medium voltage networks
Author :
Heine, P. ; Lehtonen, M. ; Niskanen, J. ; Oikarinen, A.
Author_Institution :
Dept. of Electr. Eng., Helsinki Univ. of Technol., Espoo
Abstract :
In Finland during summer time, lightning may cause a considerably high number of short interruptions and voltage sags. In case of lightning, the overvoltage protection of power distribution transformers has an important role. In case of special concern of voltage sags, the means to limit the short circuit faults causing voltage sags should be focused to the neighbourhood of the primary (110/20 kV) substation. To contribute this matter, this paper presents results of a study where spark gaps were replaced with externally gapped metal-oxide surge arresters near the primary substation. As well the theoretical studies as measurement results encourage to carry on with such investments.
Keywords :
arresters; lightning; lightning protection; overvoltage protection; power distribution protection; power supply quality; short-circuit currents; substation protection; transformer substations; lightning; metal-oxide surge arresters; overvoltage protection; power distribution transformers; rural medium voltage networks; short circuit faults; substation; voltage 110 V; voltage 20 V; voltage sags; Adders; Circuit faults; Lightning; Medium voltage; Power quality; Power transformers; Spark gaps; Substation protection; Surges; Voltage control;
Conference_Titel :
Power Quality and Supply Reliability Conference, 2008. PQ 2008
Conference_Location :
Parnu
Print_ISBN :
978-1-4244-2500-6
Electronic_ISBN :
978-1-4244-2501-3
DOI :
10.1109/PQ.2008.4653744