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7SR18 Performance Specification
Unrestricted ©2018 Siemens Protection Devices Limited
Page
37 of
2.11 87L Differential
2.11.1
Reference
Parameter
Value
Initial Setting
0.1, 0.15 … 2.5 xIn
1
st
Bias Slope
0.1, 0.15 … 0.7 x
1
st
Bias Slope Limit
0.5, 0.6 … 20 xIn
2
nd
Bias Slope
0.5, 0.55 … 2 x
Delay setting
0, 0.005 … 60 s
2.11.2
Operate and Reset Level
Attribute
Value
I
OP
Operate level
2
nd
Bias Slope
B)
I
(for
I
M
I
and
I
M
I
and
I
I
RESTRAIN
RESTRAIN
2
OPERATE
RESTRAIN
1
OPERATE
SETTING
INITIAL
87
OPERATE
>
×
>
×
>
>
Where: -
I
operate =
+
I
restrain =
+
2
B = 87BD 1
st
Bias slope limit
M
1
= 87BD 1
st
Bias slope
M
2
= 87BD 2
nd
Bias slope
Operate Level
±
10 % of I
OP
or
±
0.1In
Reset level
≥
90 % of I
OP
Repeatability
±
2 %
Transient overreach
≤
5 %
Variation
-10 °C to +55 °C
f
nom
- 3 Hz to
f
nom
+ 2 Hz
2.11.1
Operate Time
Attribute
Value (Typical)
t
Op
Element operate time (fault line)
30 ms ± 5 ms (fault line)
50 ms ± 5 ms (below fault line)
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