4-Doble-1- R-X Diagram distance relay

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Apparatus Maintenance and Power Management  for Energy Delivery 

R-X Diagram Basic Protective Relaying Ed Khan

R-X Diagram ZL2

R-X Diagram

ZL1 Zs

Relay Zs=1<85

70 deg.

ZL1=3<70 R

70 deg.

ZL2=6<70 85 deg. Location of Relay X

R-X Diagram ZL2 ZL1 Zs

Relay

70 deg. R

70 deg.

Location of Relay 85 deg. X

200<-37

Bus 1 voltage is 132 kV—132<0 Amps flowing away from Bus 1 is 200 A at 37 degrees 200<-37

R-X Diagram ZL2

R-X Diagram ZL1 Zs

Relay

1200<-37

Bus 1 voltage is 132 kV—132<0

70 deg. Zload R

70 deg.

Location of Relay 85 deg. 1200 A=274 MVA (approx.)

X Zload=kV*kV/MVA=63.59<37 deg

Amps flowing away from Bus 1 is 1200 A at -37 degrees 1200<-37

R-X Diagram ZL2

R-X Diagram ZL1 Zs

Relay

1200<-37

Bus 1 voltage is 132 kV—132<0

70 deg. Zload R

70 deg.

Location of Relay 85 deg. 1200 A=274 MVA (approx.)

X Zload=kV*kV/MVA=63.59<37 deg

Amps flowing away from Bus 1 is 1200 A at -37 degrees 1200<-37

R-X Diagram ZL2 ZL1 Zs

Relay

1200<-37

Leading Load into Bus Lagging Load out of Bus

R Lagging Load into Bus Leading Load out of Bus

-X

Any Questions? Thank you