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Design and protection of transmission capacitor banks connected to gas-insulated substations

The purpose of the paper is to present practical experience in the design and protection of transmission capacitor banks connected to typical gas-insulated substations. The paper describes common transient phenomena associated with gas-insulated switchgears, and the design and configuration of transmission capacitor banks for mitigating issues related to transient recovery voltage impacts on the circuit breaker protecting the capacitor bank. The design of protective relaying for the capacitor banks, including restrike and arcing monitoring, is also described.