Specifications

7SR242 Duobias Performance Specification
©2010 Siemens Protection Devices Limited Chapter 3 - Page 17 of 45
2.2 37,37G Undercurrent
2.2.1 Reference
Parameter Value
Is
37-n Setting 0.05, 0.10…5.0 xIn
t
d
37-n Delay setting
0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010…
10000, 10100… 14400 s
Is
37-n U/I Guard Setting 0.05, 0.10…5.0 xIn
Parameter Value
Is
37G-n Setting 0.05, 0.10…5.0 xIn
t
d
37G-n Delay setting
0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010…
10000, 10100… 14400 s
2.2.2 Operate and Reset Level
Attribute Value
I
op
Operate level
100 % Is, r 5 % or r 1% In
Reset level
d 105 % I
op
Repeatability
r 1 %
-10 °C to +55 °C
d 5 %
Variation
f
nom
- 3 Hz to f
nom
+ 2 Hz
d 5 %
2.2.3 Operate and Reset Time
Attribute Value
t
basic
Element basic operate time
1.1 to 0.5 xIs: 35 ms, r 10ms
t
op
Operate time following delay
t
basic
+ t
d
, r 1 % or r 10ms
Repeatability
r 1 % or r 10ms
Overshoot time < 40 ms
Disengaging time < 60 ms