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1.2 INTRODUCTION
is not the same as tilting the reactance, since it also tilts down to the left of the maximum reach balance point.
By adjusting the angle of the phase angle comparator rather than the angle of "maximum torque", the transient
1
overreach is not increased.
For the Zone 1 ground function, the signals are:
Phase A:
( I
- I
)· Z 1
A
0
I
· Z 1
A 2
1
I
· Z 1
0
1
I
· Z 1
A 1 F
1
Phase B:
( I
- I
)· Z 1
B
0
I
· Z 1
B 2
1
I
· Z 1
0
1
I
· Z 1
B 1 F
1
Phase C:
( I
- I
)· Z 1
C
0
I
· Z 1
C 2
1
I
· Z 1
0
1
I
· Z 1
C 1 F
b) RESTRICTED DIRECTIONAL CHARACTERISTIC
The restricted directional characteristic for the ground quadrilateral requires a separate directional unit for each
phase. No settings are required for this characteristic. The input signals to the comparator are:
I
· ZD
Phase A:
A
V
A
Phase B:
I
· ZD
B
V
B
I
· ZD
Phase C:
C
V
C
1-
8
X
"TENT" CHARACTERISTIC
4
2
Figure 1–2: TENT CHARACTERISTIC
+ K
1· I
· Z 1
– V
1
0
0
0
A
+ K
1· I
· Z 1
– V
1
0
0
0
B
+ K
1· I
· Z 1
– V
1
0
0
0
C
1
LPS-D Line Protection System
1 PRODUCT DESCRIPTION
1
3
TENTCHAR.CDR
R
GE Power Management
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