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
http://www.powerapps.org/PAES_EquiProApps.aspx
http://www.powerapps.org/PAES_GeneratorProtection.aspx