Event number
Event channel
Event block name
Event code
Description
6363
99
FRQV1
27
f<<< Trip OFF
6364
99
FRQV1
28
f<<<< Start ON
6365
99
FRQV1
29
f<<<< Start OFF
6366
99
FRQV1
30
f<<<< Trip ON
6367
99
FRQV1
31
f<<<< Trip OFF
6368
99
FRQV1
32
f> Block ON
6369
99
FRQV1
33
f> Block OFF
6370
99
FRQV1
34
f>> Block ON
6371
99
FRQV1
35
f>> Block OFF
6372
99
FRQV1
36
f>>> Block ON
6373
99
FRQV1
37
f>>> Block OFF
6374
99
FRQV1
38
f>>>> Block ON
6375
99
FRQV1
39
f>>>> Block OFF
6376
99
FRQV1
40
f< Block ON
6377
99
FRQV1
41
f< Block OFF
6378
99
FRQV1
42
f<< Block ON
6379
99
FRQV1
43
f<< Block OFF
6380
99
FRQV1
44
f<<< Block ON
6381
99
FRQV1
45
f<<< Block OFF
6382
99
FRQV1
46
f<<<< Block ON
6383
99
FRQV1
47
f<<<< Block OFF
The function registers its operation into the last twelve (12) time-stamped registers. The table below
presents the structure of the function's register content.
Table. 5.3.14 - 134. Register content.
Date and time
Event code
f Pre-trig (Hz)
f Fault (Hz)
Used SG
dd.mm.yyyy hh:mm:ss.mss
6336-6383 Descr.
Start/Trip –20ms frequency
Fault frequency
Setting group 1...8 active
5.3.15 Rate-of-change of frequency (df/dt>/<; 81R)
The rate-of-change of frequency function is used to detect fast drops or increases in frequency. If the
load changes fast this function detects and clears the frequency-based faults faster than conventional
underfrequency and overfrequency protections. One of the most common causes for the frequency to
deviate from its nominal value is an unbalance between the generated power and the load demand. If
the unbalance is big the frequency changes rapidly.
The rate-of-change of frequency protection can also be applied to detect a loss of mains situation. Loss
of mains is a situation where a part of the network (incorporating generation) loses its connection with
the rest of the system (i.e. becomes an islanded network). A generator that is not disconnected from
the network can cause safety hazards. A generator can also be automatically reconnected to the
network, which can cause damage to the generator and the network.
A
AQ
Q-F205
-F205
Instruction manual
Version: 2.04
200
© Arcteq Relays Ltd
IM00013
Summary of Contents for AQ F205
Page 1: ...AQ F205 Feeder protection IED Instruction manual ...
Page 2: ......