81 Frequency Protection - "F>" Or "F - Siemens Reyrolle 7SR5 Manual

10.28 81 Frequency Protection – "f>" or "f<"
Reference
f
set
f
Hysteresis
t
delay
Operate and Reset Level
f
op
Operate and Reset Time
t
basic
t
op
Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019
Parameter
Setting
Applied frequency (for operate time)
Hysteresis
Delay setting
Attribute
Operate level
Reset level Over frequency
Under frequency
Repeatability
Variation IEC -10 °C to +55 °C
60255-1
f
rated
Attribute
Element basic Over frequency
operate time (for
ROCOF between 0.1
Under frequency
and 5 Hz/s)
Operate time following delay
Repeatability
Disengaging time
10.28 81 Frequency Protection – "f>" or "f<"
Value
43 to 68 Hz, Δ 0.01 Hz
0 to 2 %, Δ 0.1 %
0 to 20 s, Δ 0.01 s
20 to 100 s, Δ 0.1 s
100 to 1000 s, Δ 1 s
1000 to 10000 s, Δ 10 s
1000 to 14400 s, Δ 100 s
Value
f : ± 10 MHz
set
(100 % - hysteresis) ⋅ f
(100 % + hysteresis) ⋅ f
± 1 %
≤ 5 %
± 5 % ≤ 5 %
Value
Typically < 110 ms
Maximum < 150 ms
Typically < 110 ms
Maximum < 150 ms
t + t
basic delay
± 1 % or ± 10 ms
< 100 ms
Technical Data
± 10 mHz
op
± 10 mHz
op
± 1 % or ± 10 ms
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