Differential; Reference; Operate And Reset Level; Operate Time - Siemens 7SR18 Solkor Manual

2.11 87L Differential

2.11.1 Reference

Parameter
Initial Setting
st
1 Bias Slope
st
1 Bias Slope Limit
nd
2 Bias Slope
Delay setting

2.11.2 Operate and Reset Level

Attribute
Operate level
I
OP
nd
2 Bias Slope
Operate Level
Reset level
Repeatability
Transient overreach
-10 °C to +55 °C
Variation
f
nom

2.11.1 Operate Time

Attribute
t Element operate time (fault line)
Op
Unrestricted ©2018 Siemens Protection Devices Limited
Value
0.1, 0.15 ... 2.5 xIn
0.1, 0.15 ... 0.7 x
0.5, 0.6 ... 20 xIn
0.5, 0.55 ... 2 x
0, 0.005 ... 60 s
Value
I
OPERATE
I
OPERATE
I
OPERATE
Where: -
B = 87BD 1
M = 87BD 1
1
M = 87BD 2
2
± 10 % of I
≥ 90 % of I
± 2 %
≤ 5 %
- 3 Hz to f + 2 Hz
nom
Value (Typical)
30 ms ± 5 ms (fault line)
50 ms ± 5 ms (below fault line)
7SR18 Performance Specification
>
I and
87 INITIAL SETTING
> ´
M I and
1 RESTRAIN
> ´
M I (for I
2 RESTRAIN RESTRAIN
I operate = +
+
I restrain =
2
st
Bias slope limit
st
Bias slope
nd
Bias slope
or ± 0.1In
OP
OP
>
B)
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