May 30, 2013

How Do Relays Detect Faults?

¤  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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