1MRS750886-MUM
63
REU 513
User’s Guide
ABB Substation Automation
Products and Systems
2.2.1.
Low-set stage U>
Starting
•
Close switch S1 and slowly increase the test voltage until the relay starts and the
indicator L3 is lit.
•
Read the start voltage value from the voltmeter.
Operate time
Test according to selected characteristics. Note that the maximum continuous
voltage withstand of 2 x U
n
must not be exceeded.
Definite-time characteristic
•
Set the test voltage at 2 x the setting value of stage U>.
•
Switch off S1 and clear indicators and reset output relays. The clock is started
by closing switch S1 and stopped by closing output contact PO1.
•
When the relay starts, the START indicator on the front panel is lit with yellow
light. When the relay operates, the red indicator turns on.
Inverse-time characteristic
At inverse-time characteristic, the operate time is measured at two different test
voltage values (1.1 x U> and 1.4 x U>). The operate times thus obtained are
compared with the operate times obtained from the voltage/time curves of the
concerned inverse-time characteristic.
•
Set the test voltage at one of the two defined test voltages.
•
Switch off S1 and clear indicators and reset output relays. The clock is started
by closing switch S1 and stopped by closing output contact PO1.
•
When the relay starts, the START indicator on the front panel is lit with yellow
light. When the relay operates, the red indicator turns on.
2.2.2.
High-set stage U>>
Starting
•
Close switch S1 and slowly increase the test voltage until the relay starts and
indicator L2 is lit.
•
Read the start voltage value from the voltmeter.
Operate time
Test according to selected characteristics. Note that the maximum continuous
voltage withstand of 2 x U
n
must not be exceeded.
Definite-time characteristic
•
Set the test voltage at 2 x the set start value of stage U>>.
•
Switch off S1 and clear indicators and reset output relays. The clock is started
by closing switch S1 and stopped by closing output contact PO2.
