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Chapter 3) 7SR158 Performance Specification
2.6
81R Rate-of-Change-of-Frequency (df/dt)
2.6.1
Reference
Parameter
R
Setting
s
t
Delay setting
d
F
Nominal Frequency
nom
2.6.2
Operate Level
Attribute
R
Operate Level
op
Repeatability
Variation
2.6.3
Operate and Reset Time
Attribute
Element basic operate time
(for ROCOF
1.3x setting)
t
basic
Element basic operate time
(for ROCOF
2x setting)
t
Operate time following delay
op
Repeatability
Chapter 3 - Page 22 of 24
Value
0.050, 0.075 ...10.0 Hz/s
0, 0.01 ... 20, 20.1 ... 100, 101 ... 1000, 1010 ... 10000,10100
... 100000, 101000 ... 864000s
50 Hz or 60 Hz
Value
R
-10 °C to +55 °C
Value
Typically
Maximum
Typically
Maximum
t
,
50 mHz/s (Fnom
3Hz)
s
1 %
5 %
215 ms
300 ms
185 ms
200 ms
+ t
,
1 % or
10 ms
basic
d
1 % or
10 ms
©2013 Siemens Protection Devices Limited
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