Post Retrigger - ABB REG650 Technical Manual

1MRK 502 034-UEN -
13.6.6.12
Technical Manual
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 respond to any new trig condition, during a
recording. 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 fetched.
Disturbance report function can handle maximum 3 simultaneous disturbance
recordings.
Section 13
Monitoring
411