Generator Protection
Generator protection requires the consideration of many abnormal conditions that
are not present with other system elements. The abnormal conditions that may occur
with generators include
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Overheating
-
Stator (due to overload or loss of cooling)
-
Rotor (due to overexcitation, loss of cooling
, negative sequence stator currents)
-
Winding faults
-
Stator (phase and ground faults)
-
Rotor (ground faults and shorted turns)
-
Overspeed and underspeed
-
Overvoltage
-
Loss of excitation
-
Motoring
-
Unbalanced current operation
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Out of step
-
Subsynchronous oscillations
-
Inadvertent energization
-
Nonsynchronized connection
We generally evaluate the protection settings
based on relay application manuals provided by the relay manufacturers and use variety
of analytical tools and calculations where needed for further investigations to
assess the adequacy of protection and relay performance.
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_TransformerProtection.aspx