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Disturbance recorder
Disturbance recorder function is to record the phenomenon about the occurrences of the fault
with 1ms accuracy; the function starts to operate when TRC trip command is issued. The
function has unique overcurrent relays, so the relays can instruct to start the disturbance
recorder function. The function can also start to operation when an instruction is inputted at
the PLC connection points, for which the user can enter the address of the instruction origin.
The function has variable recording and sampling times so the user can adjust set the
recording capacity with settings. The function can also record 256 signals generated in IED
logics; hence, the user can read the IED behaviors from the disturbance recorder. Note that
recording number of the phenomena is ruled by the recording and sampling times.
Recording time and amount
8.3.1
Time settings
(i)
Period of the recording is set using the [Record Time]. The disturbance recorder can operate
before the occurrence of the fault; the time before the fault occurrence can be set using the
[Pre-fault Time]. The user can choose a time among 0.1 sec. to 10.0 sec.
Setting [Pre-fault time]
Pre-fault information
Start of recording
Trip command setting
(ii)
As shown in Figure 8.3-1, the disturbance recorder start when the trip command is issued,
provided On is set for the [Trip Trig.Sw]. The user has to set Off for the setting, if the
disturbance recorder shall not start with the trip command.
Relays within disturbance recorder
8.3.2
Four relays are provided in the disturbance recorder exclusively: OC-DRT, EF-DRT, UV-DRT,
and UVS-DRT relays.
OC-DRT relay setting
(i)
An overcurrent relay within the disturbance recorder (OC-DRT) is provided. The user should
set a pick-up value for the relay to commence the disturbance recorder. Use the setting [OC-
DRT]; then set On for the [OC-DRT-EN] if this relay operation is required to commence the
recording.
Setting [Record Time]
Fault
Succeeding formation
Trip command issued
Figure 8.3-1 Period of recording time
- 752 -
6F2T0207 (0.01)
End of recording
GRE200 (5,6)
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