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Instruction Booklet
IB02402001E
December 2010
Instructions for the Eaton Type
MPCV Network Protection Relay
EaToN CoRPoRaTIoN www.eaton.com
For more information visit: www.EatonElectrical.com
IB02402001E
Instruction Bulletin
Page
26
Effective: September 2004
Instruction for the
Cutler-Hammer Type MPCV
Network Protection Relay
Relay Conversion Guidelines
1. CNJ relay should be replaced with the CNJ dummy
plate Style No. 508B559G01.
2. BN Relay (if present) should be replaced with either a
BN dummy plate Style No. 435D857G03 or BN Jack
Plate Style No. 435D857G04. In the event that there is
already a BN Dummy or Jack Plate present — DO NOT
remove the plate.
3. The Aux 1 points 7 and 8 of the AUX I/O ports — need a
breaker “b” contact (NC) input connected for communi-
cations and the anti-pumping feature. This contact input
gives the relay the status of the network protector —
open or close. This wiring change is recommended but
not required unless communications and anti-pumping
features are required.
4. Additional wiring changes and components are required
for 480 and 600 volt units. The MPCV Relay is designed
to function at 125 volts Line-to-Ground.
Energized to GRD-Y Current Transformer Rewiring (216Y/125)
A. To permit the relay to function properly requires that the
energized CTs be changed to a GRD-Y connected
scheme.
B. Remove the leads from the transformer side bus con-
nection to the CT.
C. Connect the three loose leads from the CTs together and
splice them with two additional lengths of AWG-16
Teflon
coated wire. One wire should go to GROUND
and the other wire should be connected to terminal 5 on
the relay connector.
Note: If the relay responds during test in a close mode at 180
degrees (reverse current) or a trip mode in phase or at 60 degrees,
then the CTs are connected in reverse polarity. Reverse the CT
connections on all three phases to correct this situation.
Energized to GRD-Y Current Transformer Rewiring (480Y/277)
A. To permit the relay to function properly requires that the
energized CTs be changed to a GRD-Y connected
scheme.
B. Remove leads 12, 22 and 32 from the CT and insulate the
free-end of the wire. If two or more wires are connected
at the same point, remove all of them and connect them
together. Insulate the connection.
C. Connect the CTs together and splice them with two addi-
tional lengths of AWG-16 Teflon coated wire. One wire
should go to GROUND and the other wire should be
connected to terminal 5 on the relay connector.
Note: If the relay responds during test in a close mode at 180
degrees (reverse current) or a trip mode in phase or at 60 degrees,
then the CTs are connected in reverse polarity. Reverse the CT
connections on all three phases to correct this situation.
D. Wires T2 and T3 connected at the potential transformers
must be on tap “B” and not tap “C.” If electromechanical
relays are to be re-installed, these two leads must be
reconnected to tap “C.”
Note: If the network protector is wired for an electromechanical
watt-var relay, the wiring must be changed over to the watt trip
characteristic. The MPCV can be set for a watt-var trip characteristic
even though the input is connected as a watt characteristic.