87Hs High-Set Differential; Reference; Operate And Reset Level; Operate And Reset Time - Siemens 7SR242 Duobias Technical Manual

2.17 87HS High-Set Differential

2.17.1 Reference

Parameter
ICT Multiplier
Is Setting
ts Delay setting

2.17.2 Operate and Reset Level

Attribute
I Operate level
op
Reset level
Repeatability
Transient overreach
Variation

2.17.3 Operate and Reset Time

Attribute
Element basic operate time
t
basic
Switched from 0 to x I
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
OP
Chapter 3) 7SR242 Duobias Performance Specification
Value
1.00x
1, 2 ... 30 xIn
0, 0.005... 1s
Value
5% of setting or 0.01In
95% of I
OP
2%
5%
Value
3 x I , 30 ms, 10ms
OP
5 x I , 25 ms, 10ms
OP
t + t , 1% or 10ms
basic d
Chapter 3 Page 46 of 50