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CHAPTER 4: SETPOINTS
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
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
------ - I
w
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
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
C
A
B
3
3
3
2
1
1
p
I
w
-- - I
w
-- - I
w
-- - I
w
B
A
B
C
3
3
3
2
1
1
p
I
w
-- - I
w
-- - I
w
-- - I
w
C
B
A
C
3
3
3
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
A
B
A
C
3
3
3
2
1
1
p
I
w
-- - I
w
-- - I
w
-- - I
w
B
C
A
B
3
3
3
2
1
1
p
I
w
-- - I
w
-- - I
w
-- - I
w
C
A
B
C
3
3
3
1
1
p
I
w
------ - I
w
------ - I
w
A
A
B
3
3
1
1
p
------ - I
------ - I
I
w
w
w
B
B
C
3
3
1
1
p
I
w
------ - I
w
------ - I
w
C
C
A
3
3
SYSTEM
4–97
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