¤ When a
fault takes place, the current, voltage, frequency, and other electrical
variables behave in a peculiar way. For example:
o
Current suddenly increases
o
Voltage suddenly decreases
¤ Relays can
measure the currents and the voltages and detect that there is an overcurrent,
or an undervoltage, or a combination of both
¤ Many other
detection principles determine the design of protective relays
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