Monitoring Of Demand Values - ABB REU 523 Technical Reference Manual

REU 523
4.1.6.
4.1.7.
4.1.8.
4.1.8.1.
4.1.8.2.
30
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual

Monitoring of demand values

The REU 523 provides four different kinds of demand values. The first value shows
the maximum voltage whereas the second value shows the minimum voltage of the
three main voltages. The third value shows the average voltage of the three main
voltages during one minute whereas the forth value shows the average voltage
during ten minutes.
The demand values can be set to zero by performing a master reset or through
communication using a V parameter.
Commissioning test
The function test is used for testing the configuration as well as the connections to
and from the relay. By selecting this test the eight internal signals from the
protection stages and the IRF function can be activated and tested one by one.
Provided that the internal signals from the protection stages have been set to be
routed to the output contacts (PO1, PO2, SO1 and SO2) with the switches of
SGR1...8, the output contacts will be activated and the corresponding event codes
generated when the test is run. The test will not generate protection function event
codes. Additionally, if the CBFP function is in use and PO1 is activated, PO2 will
be activated, too.
The state of the binary input can be monitored by selecting the binary input test, and
the LEDs can be turned on by selecting the LED test. Refer to the Operator's Manual
for more detailed instructions on how to perform the tests.
Disturbance recorder
Function
The REU 523 features an integrated disturbance recorder for recording monitored
quantities. The recorder continuously captures the curve forms of the voltages as
well as the status of both the internal signals and the external binary input signal and
stores these in the memory.
Triggering of the recorder will generate an event code. After the recorder has been
triggered, it will continue to record data for a pre-defined post-triggering time. An
asterisk will be shown on the LCD on completion of the recording. The status of the
recording can also be viewed using a SPA parameter.
As soon as the recorder has been triggered and the recording has finished, the
recording can be uploaded and analyzed by means of a PC provided with a special
program.
Disturbance recorder data
One recording contains data from the three analogue channels and the eight digital
channels for a preselected time. The analogue channels, whose data is stored either
as RMS curves or momentary measured values, are the voltages measured by the
relay. The digital channels, referred to as digital signals, are the start and trip signals
from the protection stages and the external binary input signal linked to the relay.
1MRS 750942-MUM