Measurements and Recording P746/EN MR/A11
MiCOM P746 (MR) 8-
11
MR
If the Protection Event setting is enabled a further set of settings is revealed which allow the
event generation by individual DDB signals to be enabled or disabled.
For further information regarding events and their specific meaning, refer to relay menu
database document (P746/EN MD).
1.3 Disturbance recorder
The integral disturbance recorder has an area of memory specifically set aside for record
storage. The number of records that may be stored by the relay is dependent upon the
selected recording duration. The relay can typically store a minimum of 50 records, each of
1.5 seconds duration. Disturbance records continue to be recorded until the available
memory is exhausted, at which time the oldest record(s) are overwritten to make space for
the newest one.
Each disturbance record consists of up to 21 analogue data channels and up to 32 digital
data channels. The relevant CT ratios for the analogue channels are also extracted to
enable scaling to primary quantities.
Setting Range
Menu Text Default Setting
Min. Max.
Step Size
DISTURB. RECORDER
Duration 600 s 100.0 ms 10.5 s 10.00 ms
This sets the overall recording time.
Trigger Position 33.3% 0.0% 100.0% 0.10 %
This sets the trigger point as a percentage of the duration. For example, the default
settings show that the overall recording time is set to 1.5s with the trigger point being at
33.3% of this, giving 0.5 s pre-fault and 1.0 s post fault recording times.
Trigger Mode Single Single / Extended
When set to single mode, if a further trigger occurs whilst a recording is taking place, the
recorder will ignore the trigger.
“ANALOG CHANNEL” submenus
Analog. Channel 1 VAN Any analog channel
The Phase A calculated voltage is assigned to this channel.
Analog. Channel 2 VBN As above
The Phase B calculated voltage is assigned to this channel.
Analog. Channel 3 VCN As above
The Phase C calculated voltage is assigned to this channel.
Analog. Channel 4 IA-T1/Ix-T1 As above
The terminal 1 phase A calculated current is assigned to this channel.
Analog. Channel 5 IB-T1/Ix-T1 As above
The Terminal 1 Phase B calculated current is assigned to this channel.
Analog. Channel 6 IC-T1/Ix-T2 As above
The Terminal 1 Phase C calculated current is assigned to this channel.
Analog. Channel 7 IA-T2 /Ix-T3 As above
The Terminal 2 Phase A calculated current is assigned to this channel.
Analog. Channel 8 IB-T2/Ix-T4 As above
The Terminal 2 Phase B calculated current is assigned to this channel..
To Next Page