Draw the Three-Phase Diagram of the Protection Team.

Three-Phase Diagram of the Protection Team.

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Write down some Elements of Protection System.

Protection System Elements:

¤ Protective relays

¤ Circuit breakers

¤ Current and voltage transducers

¤ Communications channels

¤ DC supply system

¤ Control cables

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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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