GE T60 Instruction Manual page 550

9.2 DIFFERENTIAL CHARACTERISTIC TEST EXAMPLES
TEST PHASE
Slope 2
Slope 2
9
9-12
INJECTED CURRENT
W1 CURRENT W2 CURRENT
A 0 ∠0°
0.315 ∠–90° 8.33 ∠–270°
B
0.315 ∠–270° 8.33 ∠–90°
C
0 ∠0°
A
B 0.18 ∠–90° 8.33 ∠–270°
C 0.18 ∠–270° 8.33 ∠–90°
T60 Transformer Protection System
DISPLAYED CURRENT
DIFFERENTIAL
0 ∠0° 0 ∠0°
7.77 ∠–270°
7.77 ∠–90°
0 ∠0° 0 ∠0°
8 ∠–270°
8 ∠–90°
9 COMMISSIONING
STATUS
RESTRAINT
0 ∠0° Block
I I
/ = 93.2%
d r
8.33 ∠–270°
< Slope 2 = 95%
8.33 ∠–90°
0 ∠0°
Operate
I I
/ = 96%
d r
8.33 ∠–270°
> Slope 2 = 95%
8.33 ∠–90°
GE Multilin