GE t60 Instruction Manual page 125
Ur series transformer management relay
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5 SETTINGS
Table 5–4: PHASE AND ZERO SEQUENCE COMPENSATION FOR TYPICAL VALUES OF Φ
Φ
w
[
]
Grounding[
comp
240° lag
270° lag
p
[ ]
I
w
A
p
[ ]
I
w
B
p
[ ]
I
w
C
300° lag
330° lag
p
[ ]
I
w
A
p
[ ]
I
w
B
p
[ ]
I
w
C
In our example, the following phase and zero-sequence compensation equations would be used:
2
p
1 [ ]
-- - I
1 [ ]
Winding 1:
I
=
–
A
A
3
1
p
[ ]
------ - I
2 [ ]
Winding 2:
I
w
=
A
A
3
f) MAGNITUDE, PHASE ANGLE, AND ZERO SEQUENCE COMPENSATION
Complete magnitude, phase angle, and zero sequence compensation is as follows:
c
p
[ ]
[ ]
×
[ ]
I
w
=
M w
I
w
, where w
A
A
c
p
[ ]
[ ]
×
[ ]
I
w
=
M w
I
w
, where w
B
B
c
p
[ ]
[ ]
×
[ ]
I
w
=
M w
I
w
, where w
C
C
c
[ ]
where:
I
w
= magnitude, phase and zero sequence compensated winding "w" phase A current
A
[ ]
M w
= magnitude compensation factor for winding w (as calculated in section 2)
p
[ ]
I
w
= phase and zero sequence compensated winding w phase A current (as calculated in section 3)
A
g) DIFFERENTIAL AND RESTRAINT CURRENT CALCULATIONS
Differential and restraint currents are calculated as follows:
c
c
1 [ ]
2 [ ]
...
Id
=
I
+
I
+
+
I
A
A
A
A
c
c
(
1 [ ] I
,
2 [ ] ... I
,
Ir
=
max I
A
A
A
c
c
(
1 [ ] I
,
2 [ ] ... I
,
Ir
=
max I
C
C
C
where
Id
is the phase A differential current and
A
GE Multilin
w
] = "Not within zone"
p
[ ]
[ ]
I
w
=
I
w
A
C
p
[ ]
[ ]
I
w
=
I
w
B
A
p
[ ]
[ ]
I
w
=
I
w
C
B
2
1
[ ]
[ ]
=
------ - I
w
+
------ - I
w
C
A
3
3
2
1
[ ]
[ ]
------ - I
------ - I
=
w
+
w
A
B
3
3
2
1
------ - I
[ ]
------ - I
[ ]
=
w
+
w
B
C
3
3
p
[ ]
[ ]
I
w
=
–
I
w
A
B
p
[ ]
[ ]
I
w
=
–
I
w
B
C
p
[ ]
[ ]
I
w
=
–
I
w
C
A
2
1
[ ]
[ ]
------ - I
------ - I
=
w
+
w
A
C
3
3
2
1
------ - I
[ ]
------ - I
[ ]
=
w
+
w
B
A
3
3
2
1
[ ]
[ ]
=
------ - I
w
+
------ - I
w
C
B
3
3
1
1
2
p
-- - I
1 [ ]
-- - I
1 [ ]
1 [ ]
-- - I
–
;
I
=
B
C
B
3
3
3
1
1
p
------ - I
2 [ ]
[ ]
------ - I
–
;
I
w
=
B
B
B
3
3
1 2 ... w
, ,
,
=
total
1 2 ... w
, ,
,
=
total
1 2 ... w
, ,
,
=
total
c
c
c
[
]
1 [ ]
2 [ ]
w
;
Id
=
I
+
I
total
B
B
B
c
c
,
[
]
)
(
1 [ ] I
w
;
Ir
=
max I
A
total
B
B
c
,
[
]
)
w
C
total
Ir
is the phase A restraint current (likewise for phases B and C).
A
T60 Transformer Management Relay
w
Grounding[
] = "Within zone"
2
p
[ ]
[ ]
-- - I
I
w
=
w
–
A
C
3
2
p
[ ]
-- - I
[ ]
I
w
=
w
–
B
A
3
2
p
[ ]
[ ]
I
w
=
-- - I
w
–
C
B
3
1
p
[ ]
[ ]
I
w
=
------ - I
A
C
3
1
p
[ ]
[ ]
------ - I
I
w
=
B
A
3
1
p
[ ]
------ - I
[ ]
I
w
=
C
B
3
2
p
[ ]
-- - I
[ ]
I
w
=
–
w
+
A
B
3
2
p
[ ]
[ ]
I
w
=
–
-- - I
w
+
B
C
3
2
p
[ ]
[ ]
I
w
=
–
-- - I
w
+
C
A
3
1
p
[ ]
[ ]
------ - I
I
w
=
A
A
3
1
p
[ ]
------ - I
[ ]
I
w
=
B
B
3
1
p
[ ]
[ ]
I
w
=
------ - I
C
C
3
1
1
p
1 [ ]
-- - I
1 [ ]
-- - I
1 [ ]
–
–
;
I
B
A
C
C
3
3
1
1
p
2 [ ]
------ - I
2 [ ]
[ ]
------ - I
–
;
I
w
=
C
C
3
3
c
...
[
]
+
+
I
w
;
Id
=
I
B
total
C
C
c
c
,
2 [ ] ... I
,
,
[
]
)
w
;
B
B
total
5.3 SYSTEM SETUP
comp
1
1
[ ]
[ ]
-- - I
-- - I
w
–
w
A
B
3
3
1
1
-- - I
[ ]
-- - I
[ ]
w
–
w
B
C
3
3
1
1
[ ]
[ ]
-- - I
w
–
-- - I
w
A
C
3
3
1
[ ]
w
–
------ - I
w
B
3
1
[ ]
------ - I
w
–
w
C
3
1
------ - I
[ ]
w
–
w
A
3
1
1
-- - I
[ ]
-- - I
[ ]
w
+
w
A
C
3
3
1
1
[ ]
[ ]
-- - I
w
+
-- - I
w
A
B
3
3
1
1
[ ]
[ ]
-- - I
w
+
-- - I
w
B
C
3
3
1
[ ]
------ - I
w
–
w
B
3
1
------ - I
[ ]
w
–
w
C
3
1
[ ]
w
–
------ - I
w
A
3
2
1
1
1 [ ]
-- - I
1 [ ]
-- - I
1 [ ]
-- - I
1 [ ]
=
–
–
C
A
B
3
3
3
1
2 [ ]
------ - I
2 [ ]
–
C
A
3
c
c
c
1 [ ]
2 [ ]
...
[
]
+
I
+
+
I
w
C
C
total
5
.
5-47
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