Update Documentation P341/EN AD/F43
MiCOM P341
(AD) -31
The recorder stores actual samples which are taken at a rate of 24 samples per cycle.
Each disturbance record consists of a maximum of 8 analog data channels for P341 and
thirty-two digital data channels.
Note: The relevant CT and VT ratios for the analog channels are also
extracted to enable scaling to primary quantities.
If a CT ratio is set less than unity, the relay will choose a scaling factor
of zero for the appropriate channel.
The “DISTURBANCE RECORDER” menu column is shown below:
Setting Range
Menu Text Default Setting
Min. Max.
Step Size
DISTURBANCE RECORDER
Duration 1.5s 0.1s 10.5s 0.01s
Trigger Position 33.3% 0 100% 0.1%
Trigger Mode Single Single or Extended
Analog Channel 1 VAN
Unused, VAN, VBN, VCN, VN1, A, B, C, N,
Sensitive, Frequency
Analog Channel 2 VBN As above
Analog Channel 3 VCN As above
Analog Channel 4 VN1 As above
Analog Channel 5
A-1
As above
Analog Channel 6
B-1
As above
Analog Channel 7
C-1
As above
Analog Channel 8
Sensitive
As above
Digital Inputs 1 to 32
Any output contact or optical input or internal
digital signal
Inputs 1 to 32
Trigger
No Trigger
No Trigger, Trigger L/H except Dedicated
Trigger H/L Trip Relay O/P’s which are set to
Trigger L/H
Note: The available analog and digital signals will differ between relay types
and models and so the individual courier database in the Relay Menu
Database (P341/EN MD) should be referred to when determining
default settings etc.
The pre and post fault recording times are set by a combination of the “Duration” and
“Trigger Position” cells. “Duration” sets the overall recording time and the “Trigger Position”
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 0.5s pre-fault and 1s post fault recording times.
If a further trigger occurs whilst a recording is taking place, the recorder will ignore the trigger
if the “Trigger Mode” has been set to “Single”. However, if this has been set to “Extended”,
the post trigger timer will be reset to zero, thereby extending the recording time.
As can be seen from the menu, each of the analog channels is selectable from the available
analog inputs to the relay. The digital channels may be mapped to any of the opto isolated
inputs or output contacts, in addition to a number of internal relay digital signals, such as
protection starts, LED’s etc. The complete list of these signals may be found by viewing the
available settings in the relay menu or via a setting file in MiCOM S1. Any of the digital
channels may be selected to trigger the disturbance recorder on either a low to high or a
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