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what is difference between differential protection and
distance protection and how we calculate the sloop?
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Answer Posted / mohanraj
Differential protection is a unit protection, relay works
on the principle of Kirchoff's current Law.
Measuring element is Current Transformer.
The differential current measured between the incoming
current and Outgoing current must be negligible current
during stable and through fault condition. In case of
inzone fault or unstable condition (due to CT saturate)
relay will sense the differential current and issue the
trip signal.
Application: Transformer, Generator and Cable Protection.
**********************************************************
Distance protection is widely used in the transmission
network, its also called impedance protection because relay
operates with respect to fault impedance of the
transmission line. (Z=V/I)
Measuring element is Current Transformer and Voltage
Transformer.
Usually relay having 4 zones of the transmission line.
Zone1,Zone2,Zone3 will be forward zones (Towards the Line)
and zone 4 will be Reverse zone (Towards the Source).
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