87Ref Restricted Earth Fault Protection; Reference; Operate And Reset Level; Operate And Reset Time - Siemens 7SR17 Rho Manual

Chapter 3) 7SR17 Rho Performance Specification

2.17 87REF Restricted Earth Fault Protection

2.17.1 Reference

Parameter
Is 87REF Setting
t 87REF Delay setting
d

2.17.2 Operate and Reset Level

Attribute
I Operate level
op
Reset level
Repeatability
Transient overreach
(X/R 100)
Variation

2.17.3 Operate and Reset Time

Attribute
t Element basic operate time
basic
t Operate time following delay
op
Repeatability
Overshoot time
Disengaging time
Chapter 3) Page 40 of 46
-10 °C to +55 °C
f - 3 Hz to f + 2 Hz
nom nom
Value
0.005, 0.006... 2.00 x In
0.00 ... 60 s
Value
100 % Is, 5 % or 1% x In
95 % I , 5 % or 0.1% x In
op
1 %
-5 %
5 %
5 %
Value
2 x Is, 40 ms, 10ms
5 x Is, 30 ms, 10ms
t + t , 1% or 10ms
basic d
1% or 10ms
< 40 ms
< 50 ms
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