Hitachi Relion 670 Series Applications Manual page 336

Section 15
Monitoring
• Disturbance reports are not stored.
• LED information (yellow - start, red - trip) is not stored or changed.
Operation = On:
• Disturbance reports are stored, disturbance data can be read from the local HMI and from a PC
for example using PCM600.
• LED information (yellow - start, red - trip) is stored.
Every recording will get a number (0 to 999) which is used as identifier (local HMI, disturbance
handling tool and IEC 61850). An alternative recording identification is date, time and sequence
number. The sequence number is automatically increased by one for each new recording and is
reset to zero at midnight. The maximum number of recordings stored in the IED is 200. The oldest
recording will be overwritten when a new recording arrives (FIFO).
15.6.4.1 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.
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To be able to delete disturbance records, Operation parameter has to be On.
The IED flash disk should not be used to store any user files. This causes lack of space
for new disturbance recordings.
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