GE 845 Instruction Manual page 214

SYSTEM
4–86
210° lag
p
I w
A
p
I w
B
p
I w
C
240° lag
I
A
I
B
I
C
270° lag
p
I w
A
p
I w
B
p
I w
C
300° lag
p
I
A
p
I
B
p
I
C
330° lag
p
I w
A
p
I w
B
p
I w
C
Magnitude, Phase Angle, and Zero Sequence Compensation
The complete magnitude, phase angle, and zero sequence compensation is as follows:
Winding 1 compensated currents:
C P
I [w1] = M[w1] * I
A A
C P
I [w1] = M[w1] * I
B B
C P
I [w1] = M[w1] * I
C C
Winding 2 compensated currents:
C P
I [w2] = M[w2] * I
A A
C P
I [w2] = M[w2] * I
B B
C P
I [w2] = M[w2] * I
C C
Winding 3 compensated currents:
C P
I [w3] = M[w3] * I
A A
C P
I [w3] = M[w3] * I
B B
C P
I [w3] = M[w3] * I
C C
C C
where: I [w] , I [w], and I
A B
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)
M[w3] - magnitude compensation factor for winding 3 (see previous sections)
P P P
I [w] , I [w], and I [w]- phase and zero sequence compensated winding phase
A B C
currents (see earlier)
The magnitude compensation factor for the reference winding is 1.
1 1
------ - I w ------ - I w
C A
3 3
1 1
------ - I w ------ - I w
A B
3 3
1 1
------ - I w ------ - I w
B C
3 3
p
w I w
C
p
w I w
A
p
w I w
B
1 1
------ - I w ------ - I w
C B
3 3
1 1
------ - I w ------ - I w
A C
3 3
1 1
------ - I w ------ - I w
B A
3 3
w I w
B
w I w
C
w I w
A
1 1
------ - I w ------ - I w
A B
3 3
1 1
------ - I w ------ - I w
B C
3 3
1 1
------ - I w ------ - I w
C A
3 3
[w1]
[w1]
[w1]
[w2]
[w2]
[w2]
[w3]
[w3]
[w3]
C
[w] - magnitude, phase and zero sequence compensated
C
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
1 1
p
I w ------ - I w ------ - I w
A C A
3 3
1 1
p
I w ------ - I w ------ - I w
B A B
3 3
1 1
p
I w ------ - I w ------ - I w
C B C
3 3
2 1 1
p
I w -- - I w -- - I w -- - I w
A 3 C 3 A 3 B
2 1 1
p
-- - I -- - I -- - I
I w w w w
3 3 3
B A B C
2 1 1
p
-- - I -- - I -- - I
I w w w w
C 3 B 3 A 3 C
1 1
p
I w ------ - I w ------ - I w
A C B
3 3
1 1
p
I w ------ - I w ------ - I w
B A C
3 3
1 1
p
I w ------ - I w ------ - I w
C B A
3 3
2 1 1
p
I w -- - I w -- - I w -- - I w
3 3 3
A B A C
2 1 1
p
-- - I -- - I -- - I
I w w w w
3 3 3
B C A B
2 1 1
p
I w -- - I w -- - I w -- - I w
3 3 3
C A B C
1 1
p
I w ------ - I w ------ - I w
A A B
3 3
1 1
p
I w ------ - I w ------ - I w
B B C
3 3
1 1
p
I w ------ - I w ------ - I w
C C A
3 3