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4.38
SEL-787 Relay
Instruction Manual
Date Code 20081022
Protection and Logic Functions
Basic Protection
Table 4.14
Equations Associated With U.S. Curves
Curve Type
Operating Time
Reset Time
Figure
U1 (Moderately Inverse)
U2 (Inverse)
U3 (Very Inverse)
U4 (Extremely Inverse)
U5 (Short-Time Inverse)
Table 4.15
Equations Associated With IEC Curves
Curve Type
Operating Time
Reset Time
Figure
C1 (Standard Inverse)
C2 (Very Inverse)
C3 (Extremely Inverse)
C4 (Long-Time Inverse)
C5 (Short-Time Inverse)
t
p
TD
0.0226
0.0104
M
0.02
1
–
----------------------
+
⎝
⎠
⎛
⎞
•
=
t
r
TD
1.08
1
M
2
–
----------------
⎝
⎠
⎛
⎞
•
=
t
p
TD
0.180
5.95
M
2
1
–
----------------
+
⎝
⎠
⎛
⎞
•
=
t
r
TD
5.95
1
M
2
–
----------------
⎝
⎠
⎛
⎞
•
=
t
p
TD
0.0963
3.88
M
2
1
–
----------------
+
⎝
⎠
⎛
⎞
•
=
t
r
TD
3.88
1
M
2
–
----------------
⎝
⎠
⎛
⎞
•
=
t
p
TD
0.0352
5.67
M
2
1
–
----------------
+
⎝
⎠
⎛
⎞
•
=
t
r
TD
5.67
1
M
2
–
----------------
⎝
⎠
⎛
⎞
•
=
t
p
TD
0.00262
0.00342
M
0.02
1
–
----------------------
+
⎝
⎠
⎛
⎞
•
=
t
r
TD
0.323
1
M
2
–
----------------
⎝
⎠
⎛
⎞
•
=
t
p
TD
0.14
M
0.02
1
–
----------------------
⎝
⎠
⎛
⎞
•
=
t
r
TD
13.5
1
M
2
–
----------------
⎝
⎠
⎛
⎞
•
=
t
p
TD
13.5
M
1
–
--------------
⎝
⎠
⎛
⎞
•
=
t
r
TD
47.3
1
M
2
–
----------------
⎝
⎠
⎛
⎞
•
=
t
p
TD
80
M
2
1
–
----------------
⎝
⎠
⎛
⎞
•
=
t
r
TD
80
1
M
2
–
----------------
⎝
⎠
⎛
⎞
•
=
t
p
TD
120
M
1
–
--------------
⎝
⎠
⎛
⎞
•
=
t
r
TD
120
1
M
–
--------------
⎝
⎠
⎛
⎞
•
=
t
p
TD
0.05
M
0.04
1
–
----------------------
⎝
⎠
⎛
⎞
•
=
t
r
TD
4.85
1
M
2
–
----------------
⎝
⎠
⎛
⎞
•
=
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