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Transformer Protection

Although transformers are generally provided with both electrical and mechanical protection schemes, our services are related to the protection against the electrical disturbances.


The general electrical protection provided to a transformer are related to the following


-         overload protection

-         protection against short circuits (internal / external)

-         protection against ground faults

-         transient over voltages (switching, lightning )


Protection against overload is achieved using overcurrent relays and details of thermal with stand capability curves of the transformer.


Protection against external short circuit condition is achieved by fuses, overcurrent relays with are without instantaneous settings. Protection against internal short circuit is achieved by proper application of differential protection. Suitable differential protections are needed separately for phase and ground faults.


Protection against over voltages due to switching, lightning, switching of capacitor banks or other system disturbances is achieved by proper insulation coordination.


Related Links


http://www.powerapps.org/Power System Protection Studies and Relay Coordination.aspx



Mail your questions, enquiries to raghunatha@powerapps.org