Specifications

7SR242 Duobias Performance Specification
©2010 Siemens Protection Devices Limited Chapter 3 - Page 41 of 45
2.16 87HS High-Set Differential
2.16.1 Reference
Parameter Value
ICT
Multiplier 1.00x
Is
Setting 1, 2 … 30 xIn
ts
Delay setting 0, 0.005… 1s
2.16.2 Operate and Reset Level
Attribute Value
I
op
Operate level
r 5% of setting or r 0.01In
Reset level  95% of I
OP
Repeatability
r 2%
Transient overreach  5%
-10 °C to +55 °C
Variation
f
nom
- 3 Hz to f
nom
+ 2 Hz
2.16.3 Operate and Reset Time
Attribute Value
0 to 3 x I
OP
, 30 ms, r 10ms
t
basic
Element basic operate time
0 to 5 x I
OP
, 25 ms, r 10ms
t
op
Operate time following delay
t
basic
+ t
d
, r 1% or r 10ms