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7UT51 v3
.05
.1
1000
100
10
1
.1
.01
.05
.1
Time Overcurrent Characteristic Curves for
7UT51
Version 3.0
Protective Relay
Figure 8.1
Moderately Inverse Time Overcurrent Characteristic Curves
PRIM-2330C
Time Overcurrent Protection (50HS and 50/51)
Multiples of Pickup Current (
1
10
1
10
Multiples of Pickup Current (
Moderately
Inverse
I/I p
)
100
32
20
15
10
7
5
3
2
1.5
1
0.7
0.5
100
I/I p
)
0.054196
t =
+ 0.09328
0.02
(
I/I p
)
- 1
≤
TD
= time dial setting ( 0.5
I/I p
= current in multiples of pickup
t
= operating time in seconds
Time value tolerance is ±5% for
1000
1000
100
10
1
.1
.01
1000
× TD
≤
TD
32.0, steps of 0.01)
I/I p
> 2.
103
8
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