Title :
Effects of the GIS parameters on very fast transient overvoltages
Author :
Qureshi, S.A. ; Shami, T.A.
Author_Institution :
U.E.T., Pakistan
Abstract :
Although it has been observed that gas insulated substations (GIS) are more reliable than open air substations, there is concern that switching operations performed within GIS at voltage levels higher than 300 kV may result in anomalous failure within GIS and of connected plant. This is attributed to the generation of very fast transient overvoltages (VFTO) during switching operations of load break switches, circuit breakers and especially disconnecters in GIS. The studies which are reported in the paper describe the effects of following GIS parameters on the first peak and maximum values (magnitude and time of its occurrence) of the voltages, at certain points within the GIS, and on the rate of rise of the voltages: (1) effects of variation of spacer simulation on the VFTO; (2) effects of inclusion and variation of arc resistance on the VFTO; and (3) effects of inclusion and variation of spark collapse time on the VFTO
Keywords :
arcs (electric); circuit breakers; equivalent circuits; gas insulated substations; overvoltage; power system transients; GIS; anomalous failure; arc resistance; circuit breakers; disconnecters; equivalent circuit; first peak; gas insulated substations; load break switches; maximum values; rate of rise; spacer simulation; spark collapse time; switching operations; very fast transient overvoltages; Circuit breakers; Gas insulation; Geographic Information Systems; Sparks; Substations; Surges; Switches; Switchgear; Switching circuits; Voltage;
Conference_Titel :
Electrotechnical Conference, 1994. Proceedings., 7th Mediterranean
Conference_Location :
Antalya
Print_ISBN :
0-7803-1772-6
DOI :
10.1109/MELCON.1994.380942
