Title :
Insulation failure assessment under random energization overvoltages
Author :
Mahdy, A.M. ; El-Morshedy, A. ; Anis, H.I.
Author_Institution :
Fac. of Eng., Cairo Univ., Egypt
Abstract :
This paper offers a new simple approach to the evaluation of the risk of failure of external insulation in view of their known probabilistic nature. This is applied to EHV transmission systems subjected to energization overvoltages. The randomness, both in the applied stresses and insulation´s withstand characteristics are numerically simulated and then integrated to assess the risk of failure. Overvoltage control methods are accounted for, such as the use of preinsertion breaker resistors, series capacitive compensation, and the installation of shunt reactors
Keywords :
circuit breakers; compensation; failure analysis; insulation; overvoltage; power capacitors; power system control; power transmission lines; reactors (electric); voltage control; EHV transmission systems; applied stresses; energization overvoltages; failure risk; insulation failure assessment; numerical simulation; overvoltage control methods; preinsertion breaker resistors; random energization overvoltages; series capacitive compensation; shunt reactors installation; withstand characteristics; Circuit breakers; Educational institutions; Inductance; Lightning; Power transformer insulation; Resistors; Shape; Stress; Surges; Voltage;
Journal_Title :
Industry Applications, IEEE Transactions on
