Abstract
A crucial factor of the insulation strength in EHV & UHV power system is switching over-voltage, which was simulated and calculated respectively for power system of 500kV, 750kV and 1000kV in EMTP-ATP software. The calculation results show that for the 500kV power system, the both sides of which having MOA could limit the closing and reclosing over-voltage under 1.87p.u after eliminating closing resistors, and the maximal energy absorbed by MOA is 365kJ; for the 750kV power system with three arresters, after eliminating closing resistors, the switching over-voltage could be suppressed to 1.65p.u, and the maximal energy absorbed by MOA is 3360kJ; For the 1000kV power system, according to the simulation and calculation, it would be better rely on closing resistors and MOA together to limit the switching over-voltage, provided four arresters were installed along the lines, over-voltage can be suppressed to 1.34p.u., and the energy absorbed by MOA is far less than the maximal capacity of energy.
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