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2.16 81 Under/over frequency
2.16.1 Reference
Parameter
Fs
81-n Setting
Hyst
81-n Hysteresis setting
td
81-n Delay setting
2.16.2 Operate and Reset Level
Attribute
F
Operate level
op
Reset level
Repeatability
Variation
2.16.3 Operate and Reset Time
Attribute
Element basic
operate time
t
(for ROCOF
basic
between 0.1 to
10 Hz/sec)
t
Operate time following delay
op
Repeatability
Disengaging time
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Value
43, 43.01... 68 Hz
0, 0.1... 80%
0.00 ... 14400 s
Value
100 % F
overfrequency
(100 % - hysteresis) xF
underfrequency
(100 % + hysteresis) xF
1 %
-10 °C to +55 °C
5 %
Value
Typically
overfrequency
Maximum
Typically
underfrequency
Maximum
t
basic
1 % or
100 ms
Chapter 3) 7SR17 Rho Performance Specification
,
10mHz
s
10mHz
op,
10mHz
op,
110ms
150ms
110ms
150ms
+ t
,
1 % or
10ms
d
10ms
Chapter 3 Page 39 of 46
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