Operate And Reset Level; Operate Time - Siemens 7SR242 Duobias Technical Manual

2.16.2 Operate and Reset Level

Attribute
Operate level
nd
2 Bias Slope Type = Line
I
OP
Operate level
nd
2 Bias Slope Type = Curve
87BD Operate Level
Reset level
Repeatability
Transient overreach
Variation
2.16.3
Attribute
Element basic operate time
t Switched from 0 to x I
basic
(Inrush Action: Enabled)
t Operate time following delay
op
©2015 Siemens Protection Devices Limited
-10 °C to +55 °C
f - 3 Hz to f + 2 Hz
nom nom

Operate Time

Value
3 x I
OP
10 x I
t
basic
Chapter 3) 7SR242 Duobias Performance Specification
Value
I I
OPERATE 87 INITIAL SETTING
I M I
OPERATE 1 RESTRAIN
I M I
OPERATE 2 RESTRAIN
Where
I I I
OPERATE 1 2
I I
1 2
I
RESTRAIN
2
st
B = 87BD 1 Bias slope limit
st
M = 87BD 1 Bias slope
1
M = 87BD 2nd Bias slope
2
I I
OPERATE 87 INITIAL SETTING
I M I
OPERATE 1 RESTRAIN
2
I
RESTRAIN
I
OPERATE
2
Where
2 2 2 2
K = B – 2M B
1
10% of I or 0.1In
OP
90% of I
OP
2%
5%
, 35 ms, 10ms
OP
, 30 ms, 10ms
OP
+ t , 1% or 10ms
d
and
and
(for I B)
RESTRAIN
and
and
2
K
(for I B)
RESTRAIN
Chapter 3 Page 45 of 50