Three-Phase Diagram of the Protection Team....
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May 30, 2013
Write down some Elements of Protection System.
Protection System Elements:
¤ Protective relays
¤ Circuit
breakers
¤ Current and
voltage transducers
¤ Communications
channels
¤ DC supply
system
¤ Control
cable...
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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