| 摘要 |
A device which protects a spot network type power receiving and transforming system when, while the system and an electric generator are operating in parallel, overall interruption of power supplied to the primary side of network transformers occurs suddenly. In the spot network type power receiving and transforming system, protector circuit breakers are provided on several branch buses connected to a common bus and a generator circuit breaker is connected to the electric generator; a link circuit breaker is connected to the common bus between the spot network type power receiving and transforming system and the electric generator; and network relays are connected in parallel with the protector circuit breakers respectively. Under the condition that all of the circuit breakers and network relays are in operation, one of the circuit breakers is tripped to prevent flow of reverse current from the generator toward the spot network type power receiving and transforming system, thereby ensuring the safety of maintenance and inspection of power supply buses after the overall service interruption.
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