Restricted Earth Fault Protection; Reference; Operate And Reset Level; Operate And Reset Time - Siemens 7SR242 Duobias Technical Manual

2.14 64H Restricted Earth Fault Protection

2.14.1 Reference

Parameter
I Setting
s
t Delay setting
d

2.14.2 Operate and Reset Level

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

2.14.3 Operate and Reset Time

Attribute
t Element basic operate time
basic
t Operate time following delay
op
Repeatability
Overshoot time
Disengaging time

2.14.4 Harmonic Rejection

Harmonic Rejection
nd th
2 to 15 harmonic
©2015 Siemens Protection Devices Limited
-10 °C to +55 °C
f - 3 Hz to f + 2 Hz
nom nom
Chapter 3) 7SR242 Duobias Performance Specification
Value
0.005, 0.010... 0.95 xIn
0.00, 0.01... 20.0, 20.1... 100.0, 101....1000, 1010 ...
10000 , 10100 ... 14400 s
Value
100 % Is, 5 % or 1% xIn
95 % I , 5 % or 0.1% xIn
op
1 %
-5 %
5 %
5 %
Value
0 to 2 xIs, 40 ms, 10ms
0 to 5 xIs, 30 ms, 10ms
t + t , 1% or 10ms
basic d
1% or 10ms
< 40 ms
< 50 ms
40:1 minimum (50/60Hz)
Chapter 3 Page 42 of 50