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Disturbance report (DRP)
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Analog-signal trigger (over/under function)
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A disturbance report can be manually triggered from the local HMI, a front-connected
PC, or SMS. When the trigger is activated, the manual trigger signal is generated. This
feature is especially useful for testing. Refer to Operators manual for procedure.
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Any binary signal state (logic one or a logic zero) can be selected to generate a trigger.
The binary signal must remain in a steady state for at least 15 ms to be valid.
When a binary signal is selected to generate a trigger from a logic zero, the selected sig-
nal will not be listed in the indications list of the disturbance report.
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All analog signals are available for trigger purposes, no matter if they are recorded in
the disturbance recorder or not. But the disturbance recorder function must be installed
in the terminal.
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Under certain circumstances the fault condition may reoccur during the postfault re-
cording, for instance by automatic reclosing to a still faulty network. In order to capture
the new fault it is possible to allow retriggering during the PostFault recording.
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The parameters for the disturbance report function are set via the local HMI or PST (Pa-
rameter Setting Tool). Refer to the Technical reference manual for setting parameters
and path in local HMI.
The settings include:
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Disturbance Report (On/Off)
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Re-trigger during post-fault state (On/Off)
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Sequence number (0-255) (normally not necessary to set)
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Recording times for the Disturbance Report and the event/indication
logging, including pre-fault time, post-fault time, and limit time for the
entire disturbance
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