Switching Over Voltage Study is based on computer transient simulation using the EMTP/ATP program. Switching under different loading conditions and load rejection at important 400 kV and 220 kV buses should be considered. The influence of surge arresters on the switching surges will also be investigated through conventional modeling. Simulation plots will be assessed and the worst switching conditions will be reported.
These studies are generally performed to assess the transients associated with:
- Energization of overhead transmission lines and study of associated transients, surge arrester ratings, transient mitigation methods.
- Energization of capacitor banks / reactors in industrial or public utility facilities.
- Transients associated with various switching actions such as fault application and clearance.
Lightning Over Voltage Study
Lightning over voltage will be determined mainly by transient power system analysis [EMTP studies] , including statistical switching calculation taking account of the time difference between first and last pole to close or open.
Grounding Mat Design
The grounding study is strictly based on the procedure recommended in IEEE std.80 or IEC 479 for safety analysis.
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