Recording Times - ABB RET650 Applications Manual

1MRK 504 169-UEN A
13.6.3.1
Transformer protection RET650 2.2 IEC
Application manual
The IED flash disk should NOT be used to store any user files. This
might cause disturbance recordings to be deleted due to lack of disk
space.

Recording times

The different recording times for Disturbance report are set (the pre-fault time,
post-fault time, and limit time). These recording times affect all sub-functions more
or less but not the Event list (EL) function.
Prefault recording time (PreFaultRecT) is the recording time before the starting
point of the disturbance. The setting should be at least 0.1 s to ensure enough
samples for the estimation of pre-fault values in the Trip value recorder (TVR)
function.
Postfault recording time (PostFaultRecT) is the maximum recording time after the
disappearance of the trig-signal (does not influence the Trip value recorder (TVR)
function).
Recording time limit (TimeLimit) is the maximum recording time after trig. The
parameter limits the recording time if some trigging condition (fault-time) is very
long or permanently set (does not influence the Trip value recorder (TVR)
function).
Operation in test mode
If the IED is in test mode and OpModeTest = Off. Disturbance report function does
not save any recordings and no LED information is displayed.
If the IED is in test mode and OpModeTest = On. Disturbance report function
works in normal mode and the status is indicated in the saved recording.
Post Retrigger
Disturbance report function does not automatically respond to any new trig
condition during a recording, after all signals set as trigger signals have been reset.
However, under certain circumstances the fault condition may reoccur during the
post-fault recording, for instance by automatic reclosing to a still faulty power line.
In order to capture the new disturbance it is possible to allow retriggering
(PostRetrig = On) during the post-fault time. In this case a new, complete recording
will start and, during a period, run in parallel with the initial recording.
When the retrig parameter is disabled (PostRetrig = Off), a new recording will not
start until the post-fault (PostFaultrecT or TimeLimit) period is terminated. If a new
trig occurs during the post-fault period and lasts longer than the proceeding
recording a new complete recording will be started.
Disturbance report function can handle a maximum of 3 simultaneous disturbance
recordings.
Section 13
Monitoring
M12179-88 v5
M12179-492 v4
M12155-173 v7
289