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Common VT Wirings
Check the installation direction of the VTs.
VT Check Measuring Values
Connect a three-phase measuring voltage equal to the rated voltage to the relay.
Now adjust the voltage values in the nominal voltage range with the corresponding nominal frequencies that are not
likely to cause over-voltage or under-voltage trips.
Compare the values shown in the device display with the readings of the measuring instruments. The deviation must
be according to the specifications in the Technical Data section.
It is imperative that the secondary sides of measuring transformers be
grounded.
For current and voltage sensing function, externally wired and appropriate
current and voltage transformer must be used, based on the required input
measurement ratings. Those devices provide the necessary insulation
functionality.
Take the connection of the measuring transformers
(open delta/Wye connection) into account.
EMR-4000
www.eaton.com
IM02602009E
49
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