Similarly to the power transformers, HV oil immersed shunt reactors typically have build-in mechanical devices for internal fault or abnormal operating condition detection. Typically the following built-in mechanical fault detection devices can be encountered within shunt reactor:
• gas detection relay (i.e. Buchholz relay) with alarm and trip stage
• sudden pressure relay
• winding temperature contact thermometer with alarm and trip stage
• oil temperature contact thermometer with alarm and trip stage
• low oil level relay
These mechanical relays are excellent compliment to the electrical measuring relays previously explained. Typically it is recommended to arrange that these mechanical relays trip reactor circuit breaker independently from electrical relays. However signals from mechanical devices shall be connected to binary inputs of numerical relays in order to get time tagging information, disturbance recording and event reporting in case of their operation.
Sunday, April 20, 2014
MECHANICAL FAULT DETECTION OF SHUNT REACTOR
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