81Under/Over Frequency; Reference; Operate And Reset Level; Operate And Reset Time - Siemens 7SR224 Technical Manual

2.16 81Under/Over Frequency

2.16.1 Reference

Parameter
Fs Setting
Hyst Hysteresis setting
td Delay setting

2.16.2 Operate and Reset Level

Attribute
Operate level
F
op
overfrequency
Reset level
underfrequency
Repeatability
Variation -10 °C to +55 °C

2.16.3 Operate and Reset Time

Attribute
Element basic
overfrequency
operate time
t
(for ROCOF
basic
between 0.1
underfrequency
and 5.0 Hz/sec)
t Operate time following delay
op
Repeatability
Disengaging time
©2010 Siemens Protection Devices Limited
7SR224 Argus Performance Specification
Value
40, 40.01... 69.99 Hz
0, 0.1... 80%
0.00, 0.01... 20.0, 20.5... 100.0, 101....1000, 1010 ... 10000 ,
10100 ... 14400 s
Value
, ± 10mHz
100 % F
s
± 10mHz
(100 % - hyst) xF
op,
± 10mHz
(100 % + hyst) xF
op,
± 1 %
≤ 5 %
Value
Typically < 110ms
Maximum < 150ms
Typically < 110ms
Maximum < 150ms
, ± 1 % or ± 10ms
t + t
basic d
± 1 % or ± 10ms
< 100 ms
Chapter 3 Page 40 of 49