_ _ 1
_ _ 2
_ 2
_ _ 1
_ _ 2
_ 1
_ _ 1
_ _ 2
IDA
I A W
I A W
Vn W
IDB
A I B W
B I B W
Vn W
IDC
I C W
I C W
é
ù
é
ù
é
ù
ê
ú
ê
ú
ê
ú
= ×
+
× ×
ê
ú
ê
ú
ê
ú
ê
ú
ê
ú
ê
ú
ë
û
ë
û
ë
û
_ _ 1
_ _ 2
_ 2
_ _ 1
_ _ 2
_ 1
_ _ 1
_ _ 2
IDA
I A W
I A W
Vn W
IDB
A I B W
B I B W
Vn W
IDC
I C W
I C W
é
ù
é
ù
é
ù
ê
ú
ê
ú
ê
ú
= ×
+
× ×
ê
ú
ê
ú
ê
ú
ê
ú
ê
ú
ê
ú
ë
û
ë
û
ë
û
_ _ 1
_ _ 2
_ 2
_ _ 1
_ _ 2
_ 1
_ _ 1
_ _ 2
IDA
I A W
I A W
Vn W
IDB
A I B W
B I B W
Vn W
IDC
I C W
I C W
é
ù
é
ù
é
ù
ê
ú
ê
ú
ê
ú
= ×
+
× ×
ê
ú
ê
ú
ê
ú
ê
ú
ê
ú
ê
ú
ë
û
ë
û
ë
û
1
2
3
EQUATION1879 V1 EN-US
(Equation 1)
where:
1.
is the resulting Differential Currents
2.
is the current contribution from the W1 side
3.
is the current contribution from the W2 side
1
2
3
_ _ 1
_ _ 2
_ _ 3
_ 2
_ 3
_ _ 1
_ _ 2
_ _ 3
_ 1
_ 1
_ _ 1
_ _ 2
_ _ 3
IDA
I A W
I A W
IL A W
Vn W
Vn W
IDB
A I B W
B I B W
C IL B W
Vn W
Vn W
IDC
I C W
I C W
IL C W
é
ù
é
ù
é
ù
é
ù
ê
ú
ê
ú
ê
ú
ê
ú
= ×
+
× ×
+
× ×
ê
ú
ê
ú
ê
ú
ê
ú
ê
ú
ê
ú
ê
ú
ê
ú
ë
û
ë
û
ë
û
ë
û
4
EQUATION1882-ANSI V1 EN-US
(Equation 2)
where:
1.
is the resulting Differential Currents
2.
is the current contribution from the W1 side
3.
is the current contribution from the W2 side
4.
is the current contribution from the W3 side
and where, for equation
and equation
:
ID_A
is the fundamental frequency differential current in phaseA (in W1 side primary
amperes)
ID_B
is the fundamental frequency differential current in phase B (in W1 side primary
amperes)
ID_C
is the fundamental frequency differential current in phaseC (in W1 side primary
amperes)
I_A_W1
is the fundamental frequency phase current in phaseA on the W1 side
I_B_W1
is the fundamental frequency phase current in phaseB on the W1 side
I_C_W1
is the fundamental frequency phase current in phaseC on the W1 side
I_A_W2
is the fundamental frequency phase current in phaseA on the W2 side
I_B_W2
is the fundamental frequency phase current in phase B on the W2 side
I_C_W2
is the fundamental frequency phase current in phase C on the W2 side
Table continues on next page
Section 6
1MRK 502 066-UUS B
Differential protection
120
Technical manual
Summary of Contents for Relion 670 series
Page 1: ... RELION 670 SERIES Generator protection REG670 Version 2 1 ANSI Technical manual ...
Page 2: ......
Page 48: ...42 ...
Page 62: ...56 ...
Page 182: ...176 ...
Page 692: ...686 ...
Page 726: ...720 ...
Page 1014: ...1008 ...
Page 1242: ...1236 ...
Page 1362: ...1356 ...
Page 1386: ...1380 ...
Page 1422: ...1416 ...
Page 1431: ...1425 ...