7.1 GENERAL
Electrical
plant can be damaged, or destroyed, by operation outside its designed ratings
or by fault conditions caused by a breakdown of some part of the system.
The
automatic protection of electrical installations, including generators, against
such damage is described fully in the manual ‘Electrical Protection’.
In
brief, generators are protected against some or all of the following abnormal
conditions:
·
Overcurrent
·
Earth fault
·
Differential current
·
Reverse power
·
Overvoltage
·
Undervoltage
·
Underfrequency
·
Field failure
·
Diode failure
·
Winding overtemperature
·
Turbine trip
Overspeed.
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