Answer / ganesan.n

Distance relay i snothing but a Impedance Relay!!!

This relay Trips when the impedance level gets increased/
decreased above/below the Reach.

[Reach - Predetermined Impedance Level]

Answer / kmani190

actually distace relay oprate based on impadence . need
brif explaination please .....

Answer / eniyavan

Distance Relay is also Called as Impedance Relay.

If Any Fault is Occur in Transmission Line(like phase to
Earth Fault & Phase to Phase Fault)This Relay Acts to trip
the Circit Breaker.It's Opearting for line Impedance Value
(Line Impedance=Zxkm).

Answer / arun

distance relay used in transmission lines
T=k1 i2+k2 v2+k3 v *i*cos(thita -del)+k4
this is universal torque equetion use for defining distance relay
there r 3 types of distance relay mho relay used for long transmission lines for which k1 =0
reactance relay used for short transmission line for which k2=0
impedance relay used for medium transmission lines for which k3 =0
when evar impedance seen by the relay is less than reach then these relays operates means Zseen is less than Zset

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