Post Retrigger - ABB RET650 Technical Manual

Section 14
Monitoring
14.4.6.12
472
Manual trigger
A disturbance report can be manually triggered from the local HMI, PCM600 or via
station bus (IEC 61850). When the trigger is activated, the manual trigger signal is
generated. This feature is especially useful for testing.
Binary-signal trigger
Any binary signal state (logic one or a logic zero) can be selected to generate a trigger
(Triglevel = Trig on 0/Trig on 1). When a binary signal is selected to generate a trigger
from a logic zero, the selected signal will not be listed in the indications list of the
disturbance report.
Analog-signal trigger
All analog signals are available for trigger purposes, no matter if they are recorded in
the disturbance recorder or not. The settings are OverTrigOp, UnderTrigOp,
OverTrigLe and UnderTrigLe.
The check of the trigger condition is based on peak-to-peak values. When this is
found, the absolute average value of these two peak values is calculated. If the average
value is above the threshold level for an overvoltage or overcurrent trigger, this trigger
is indicated with a greater than (>) sign with the user-defined name.
If the average value is below the set threshold level for an undervoltage or
undercurrent trigger, this trigger is indicated with a less than (<) sign with its name.
The procedure is separately performed for each channel.
This method of checking the analog start conditions gives a function which is
insensitive to DC offset in the signal. The operate time for this start is typically in the
range of one cycle, 20 ms for a 50 Hz network.
All under/over trig signal information is available on the local HMI and PCM600.

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 maximum 3 simultaneous disturbance
recordings.
1MRK 504 135-UEN A
Technical manual