Triggering - ABB REU 523 Technical Reference Manual

REU 523
4.1.8.4.
4.1.8.5.
4.1.8.6.
4.1.9.
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Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
Writing the value 1 to parameter M2 will clear the recorder memory, restart the
storing of new data and enable the triggering of the recorder. Recorder data can be
cleared by performing a master reset. Writing the value 2 to parameter V246 will
restart the unloading process by setting the time stamp and the first data ready to be
read.

Triggering

The user can select the start or trip signal from any protection stage, except for the
trip signal from high-set stage U>>, and/or the external binary input signal to trigger
the disturbance recorder, either on the rising or falling edge of the signal(s).
Triggering on the rising edge means that the post-triggering recording sequence will
start when the signal is activated. Correspondingly, triggering on the falling edge
means that the post-triggering recording sequence will start when the active signal
is reset. The trigger signal(s) and the edge are selected with parameters
V241...V244; see tables 4.1.10.4-5 and 4.1.10.4-6. The recorder can also be
triggered manually using parameter M1.
Triggering of the disturbance recorder is only possible if the recorder has not already
been triggered.
Settings and unloading
The setting parameters for the disturbance recorder are V parameters V240...V244
and V246, and M parameters M15, M18, M20 and M80...M82.
Unloading the recorder requires that M80 has been set. Unloading is done using a
PC application. The uploaded recorder data is stored in separate files defined by the
®
comtrade format.
Event code of the disturbance recorder
The disturbance recorder generates an event code (E31) on triggering of the recorder
by default. The event mask is defined using serial parameter V158.
Recorded data of the last events
The REU 523 records up to five events. This enables the user to analyze the last five
fault situations in the electrical power network. Each event includes the maximum
and the minimum value of the measured main voltages, the voltage measured at the
time of the trip, the minimum positive-phase-sequence value, start durations, and the
time stamp. Additionally, information on the number of starts is provided.
Recorded data and the number of starts are non-volatile by default. A master reset
will erase the contents of the recorded events and the number of starts.
The REU 523 will collect different data depending on whether an over or an
undervoltage stage has started. The collected data and the time stamp will be stored
in the first event register and the four previously stored events will move one step
forward. When a sixth event is stored, the oldest event will be cleared.
When an overvoltage stage starts, the REU 523 will start to collect the maximum
voltage value and measure the start duration, expressed as a percentage of the set
operate time. If the stage is reset before the operate time has elapsed, the maximum
voltage value captured during the start and the start duration will be stored.
1MRS 750942-MUM