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This paper discusses a number of aspects of operational-risk assessment of transmission systems, operational-risk assessment uses techniques developed from reliability analysis to predict the performance of the transmission system during a short period of time (several hours) starting from a well-defined operational state. The influence of weather parameters on the momentary failure rate and the operational...
When snow is unevenly distributed on horizontal insulators there is a higher risk for flashover. This was investigated for a 400 kV circuit breaker with horizontal breaking chamber insulators. The highest risk occurs when connecting a line to a generator. For a short moment during the synchronization the voltage can reach 2.5 times the normal phase-to-earth voltage. A test method that simulates worst...
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