ABB REL 356

ABB REL 356 Current Differential Protection
5-11
Testing
Table 5-1. Zone 2 Phase-Ground Forward Internal Faults: Z2GF = 4.5 Ohms Z2GR = 0.01 Ohms
Volts
Ð
Angle
I
Amps
Ð
Angle
Fault Z
Ohms
Ð
Angle
Relay System
Operation
AG at MTA 90% of reach fault
Va = 30
Ð
0 Ia = 4.4
Ð
-75 (285) 4.05
Ð
75
Vb = 69
Ð
-120 (240) Ib = 0
Vc = 69 Ð -240 (120) Ic = 0
Z2T Trip
Fault type AG
Z2G Unit
Trip time 100-132 ms
AG at MTA –45 ° 90% of reach fault
Va = 30 Ð 0 Ia = 6.23 Ð -30 (330) 2.86 Ð 30
Vb = 69
Ð
-120 (240) Ib = 0
Vc = 69
Ð
-240 (120) Ic = 0
Z2T Trip
Fault type AG
Z2G Unit
Trip time 100-132 ms
AG at MTA +45˚ 90% of reach fault
Va = 30
Ð
0 Ia = 6.23
Ð
-120 (240) 2.86
Ð
120
Vb = 69
Ð
-120 (240) Ib = 0
Vc = 69
Ð
-240 (120) Ic = 0
Z2T Trip
Fault type AG
Z2G Unit
Trip time 100-132 ms
BG at MTA 90% of reach fault
Va = 69
Ð
0 Ia = 0 4.05
Ð
75
Vb = 30
Ð
-120 (240) Ib = 4.4
Ð
-195 (165)
Vc = 69
Ð
-240 (120) Ic = 0
Z2T Trip
Fault type BG
Z2G Unit
Trip time 100-132 ms
BG at MTA –45˚ 90% of reach fault
Va = 69
Ð
0 Ia = 0 2.86
Ð
30
Vb = 30
Ð
-120 (240) Ib = 6.23
Ð
-150 (210)
Vc = 69 Ð -240 (120) Ic = 0
Z2T Trip
Fault type BG
Z2G Unit
Trip time 100-132 ms
BG at MTA +45˚ 90% of reach fault
Va = 69
Ð
0 Ia = 0 2.86
Ð
120
Vb = 30 Ð -120 (240) Ib = 6.23 Ð -240 (120)
Vc = 69
Ð
-240 (120) Ic = 0
Z2T Trip
Fault type BG
Z2G Unit
Trip time 100-132 ms
CG at MTA 90% of reach fault
Va = 69 Ð 0 Ia = 0 4.05 Ð 75
Vb = 69
Ð
-120 (240) Ib = 0
Vc = 30
Ð
-240 (120) Ic = 4.4
Ð
-315 (45)
Z2T Trip
Fault type CG
Z2G Unit
Trip time 100-132 ms
CG at MTA –45˚ 90% of reach fault
Va = 69
Ð
0 Ia = 0 2.86
Ð
30
Vb = 69
Ð
-120 (240) Ib = 0
Vc = 30
Ð
-240 (120) Ic = 6.23
Ð
-270 (90)
Z2T Trip
Fault type CG
Z2G Unit
Trip time 100-132 ms
CG at MTA +45˚ 90% of reach fault
Va = 69
Ð
0 Ia = 0 2.86
Ð
120
Vb = 69
Ð
-120 (240) Ib = 0
Vc = 30 Ð -240 (120) Ic = 6.23 Ð 0
Z2T Trip
Fault type CG
Z2G Unit
Trip time 100-132 ms