INES-event
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UNSUCCESSFUL SWITCH OVER FROM 400 KV TO 130 KV

Due to a failure in the main generator's cooling system the automatic protection system ordered the 23 kV generator breaker to open. The breaker opened correctly but a malfunction signal ordered the 400 kV unit breaker to disconnect from the grid. The automatic transfer to the alternative 130 kV line was initiated to feed the bus bars. During this transfer the overcurrent protection opened an explosive operated 6 kV connector. The smoke initiated the fire detection system and the fire brigade rushed to the site. The event had no consequence at all.













Location: RINGHALS-2
Event date: Sun, 09-04-1995
Nuclear event report
Legenda & explanation