GE 889 - Page 212

4–82 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
SYSTEM CHAPTER 4: SETPOINTS
Magnitude, Phase Angle, and Zero Sequence Compensation
The complete magnitude, phase angle, and zero sequence compensation is as follows:
Winding 1 compensated currents:
I
A
C
[w1] = M[w1] * I
A
P
[w1]
I
B
C
[w1] = M[w1] * I
B
P
[w1]
I
C
C
[w1] = M[w1] * I
C
P
[w1]
Winding 2 compensated currents:
I
A
C
[w2] = M[w2] * I
A
P
[w2]
I
B
C
[w2] = M[w2] * I
B
P
[w2]
I
C
C
[w2] = M[w2] * I
C
P
[w2]
where: I
A
C
[w] , I
B
C
[w], and I
C
C
[w] - magnitude, phase and zero sequence compensated
winding phase currents
M[w1]- magnitude compensation factor for winding 1 (see previous sections)
M[w2]- magnitude compensation factor for winding 2 (see previous sections)
I
A
P
[w] , I
B
P
[w], and I
C
P
[w]- phase and zero sequence compensated winding phase
currents (see earlier)
The magnitude compensation factor for the reference winding is 1.
210° lag
240° lag
270° lag
300° lag
330° lag
I
A
p
w>@
1
3
-------
I
C
w>@
1
3
-------
I
A
w>@–=
I
B
p
w>@
1
3
-------
I
A
w>@
1
3
----- --
I
B
w>@–=
I
C
p
w>@
1
3
-------
I
B
w>@
1
3
----- --
I
C
w>@–=
I
A
p
w>@
1
3
-------
I
C
w>@
1
3
---- ---
I
A
w>@–=
I
B
p
w>@
1
3
-------
I
A
w>@
1
3
----- --
I
B
w>@–=
I
C
p
w>@
1
3
-------
I
B
w>@
1
3
----- --
I
C
w>@–=
I
A
p
w>@ I
C
w>@=
I
B
p
w>@ I
A
w>@=
I
C
p
w>@ I
B
w>@=
I
A
p
w>@
2
3
---
I
C
w>@
1
3
---
I
A
w>@–
1
3
---
I
B
w>@–=
I
B
p
w>@
2
3
---
I
A
w>@
1
3
---
I
B
w>@–
1
3
---
I
C
w>@–=
I
C
p
w>@
2
3
---
I
B
w>@
1
3
---
I
A
w>@–
1
3
---
I
C
w>@–=
I
A
p
w>@
1
3
-------
I
C
w>@
1
3
-------
I
B
w>@–=
I
B
p
w>@
1
3
-------
I
A
w>@
1
3
----- --
I
C
w>@–=
I
C
p
w>@
1
3
-------
I
B
w>@
1
3
----- --
I
A
w>@–=
I
A
p
w>@
1
3
-------
I
C
w>@
1
3
---- ---
I
B
w>@–=
I
B
p
w>@
1
3
-------
I
A
w>@
1
3
----- --
I
C
w>@–=
I
C
p
w>@
1
3
-------
I
B
w>@
1
3
----- --
I
A
w>@–=
I
A
p
w>@ I
B
w>@–=
I
B
p
w>@ I
C
w>@–=
I
C
p
w>@ I
A
w>@–=
I
A
p
w>@
2
3
---
I
B
w>@–
1
3
---
I
A
w>@
1
3
---
I
C
w>@++=
I
B
p
w>@
2
3
---
I
C
w>@–
1
3
---
I
A
w>@
1
3
---
I
B
w>@++=
I
C
p
w>@
2
3
---
I
A
w>@–
1
3
---
I
B
w>@
1
3
---
I
C
w>@++=
I
A
p
w>@
1
3
-------
I
A
w>@
1
3
----- --
I
B
w>@–=
I
B
p
w>@
1
3
-------
I
B
w>@
1
3
----- --
I
C
w>@–=
I
C
p
w>@
1
3
-------
I
C
w>@
1
3
-------
I
A
w>@–=
I
A
p
w>@
1
3
-------
I
A
w>@
1
3
----- --
I
B
w>@–=
I
B
p
w>@
1
3
-------
I
B
w>@
1
3
----- --
I
C
w>@–=
I
C
p
w>@
1
3
-------
I
C
w>@
1
3
---- ---
I
A
w>@–=