Event Code; Recorded Data - ABB REU 523 Technical Reference Manual

1MRS 750942-MUM
4.1.7.6.
4.1.8.
ABB Automation
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
Parameter Description
V245 Length of recording after triggering. The total recording length is 40
cycles.
V246 Status of the recorder
M18 Used for giving the disturbance recorder a unique identification number
M20 Used for designating the disturbance recorder the name of the station
where the relay is located. The maximum length of a name is 15
characters.
M80 Used for designating the rated voltage and unit of the primary voltage
transformer(s). The format of the parameter is XXXX,YY; where XXXX is
the voltage value ranging between 0.00...600, and YY is the unit, e.g.
20.0,kV. The rated voltage and unit are used for calculating the primary
values for the analogue channels in a special PC program used for
unloading the disturbance recorder. Setting the parameter M80 also
enables display of the primary values on the LCD.

Event code

It is possible to set the disturbance recorder to generate an event code into the event
register when the recorder is triggered. To enable the event code to be generated, set
the event mask in serial parameter V158. The event code generated is E31.

Recorded data

When one of the overvoltage stages starts, recording of the highest measured voltage
value as well as the start duration, measured as a percentage of the set operate time,
begins. If the started protection stage resets before the operate time has elapsed, the
highest voltage value captured during the starting and the start duration are stored in
the event register at the moment of reset.
On the other hand, if either of the overvoltage stages trips, both the values at the
moment of tripping and the values captured during the starting are memorized.
The same principle applies to the undervoltage stages: if a stage only starts, the
lowest voltage value as well as the lowest calculated positive-phase-sequence value
and the start duration are stored in the event register. In case the starting is followed
by a trip, the values at the moment of tripping as well as the values captured during
the starting are memorized.
The event register takes the latest five events. The recording of a new sequence is
only possible after all the stages that caused the previous event have reset.
How many times (range: 0...255) a protection function has started can be read via
the MMI submenu "Number of starts" under "Recorded data" or via the parameters
V5...V8.
REU 523
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