INSTALLATION
2-1
Unpacking the Unit
The shipping container should contain your Relay and this
manual. Inspect the unit and inform GE MULTILIN of any
damage. If re-shipment is required the original container and
packing should be used.
Mounting the Relay
The Relay is designed to be panel mounted. It should be
located so that the keypad is accessible with the door
opening from the right. The unit should be mounted so that
the display is easily visible. It is recommended that the relay
be mounted as far away as possible from heavy current
sources and strong magnetic fields.
The 4 mounting studs of the Relay are equipped with (1) #10
internal star lockwasher, (1) 10-32 threaded hex spacer
0.25" long, (1) #10 split lockwasher, and (1) 10-32 hex nut.
Remove only the split lockwasher and the 10-32 hex nut
before installing the Relay in the panel. Then use this split
lockwasher and hex nut to secure the Relay in the panel.
The dimensions of the unit and the necessary cutout dimen-
sions are shown in Figure 2.1.
To reduce the required space behind the mounting panel an
optional depth reducer is available. This reduces the depth to
6.25". It increases the width of the front panel to 15.33". For
mounting dimensions see Fig. 2.2.
Making Wiring Connections
All wiring connections to the Relay are made at the back of
the unit as shown in Figure 2.10. All terminals are also
identified in Table 2-1 with their functions.
Figure 2.5 shows the connections for a typical installation.
The actual connections made to the Relay will vary according
to the application. All contacts in the figure are shown in the
state they will have with control power applied to the unit. The
contacts are shown in the “non-active” state.
The relay can be removed from the outside case for the
purpose of checking and/or calibration. The wiring is to the
outside and remains intact.
WARNING
Extreme caution must be exercised when the chassis is
withdrawn from an in service unit as this exposes live
terminals.
Power Supply Connections
Depending upon the ordered power supply, the Relay is
designed to operate within one of the following voltage
ranges:
1. 90-260 VAC and 95-280 VDC
2. 20-60 VDC
No internal or external adjustments are required to use any
of the above supply voltages.
Power supply connections are made at terminals 63 and 64.
The relay is grounded by connecting terminal 62 directly to
the dedicated ground entering the switchgear enclosure.
Surge Ground Connection
For safety and optimum noise immunity due to transients, a
low impedance connection must be made between the surge
ground terminal and the switchgear ground. This must be a
separate, dedicated wire tied directly to the switchgear cop-
per bus strip (flat, braided wire is ideal).
CAUTION
FAILURE TO MAKE PROPER GROUND CONNECTIONS
MAY CAUSE DAMAGE TO THE RELAY.
Current Transformers
The three current transformers supply the Relay with cur-
rents proportional to the current in each of the phases of the
feeder being protected. They are connected to terminals 49
to 54 as shown in Figure 2.5. Observe correct polarity when
connecting the current transformers to the unit.
The CT terminal with the dot marked on it must be connected
to the terminal marked “:5/:1”. Each CT should have the
same physical orientation, with polarity connected as shown
in Figure 2.5. The sides of the CT which are not marked with
a polarity dot are connected together and grounded.
Residual ground sensing is provided by connecting the com-
mon terminals of the three CTs together through the ground
sensing input terminal 56 as shown in the wiring diagram,
Figure 2.5. These connections allow the relay to check the
vector sum of all three phase currents. If this is not zero, a
ground fault condition is sensed by the unit.
For typical CT wiring of the Relay with the optional Metering
Transducer Module (MTM) see Figure 2.7A and Figure 2.7B.
Voltage Transformers
Separate voltage transformers are needed for voltage sens-
ing and terminals 35 to 38 are used for this. The transformers
can be connected in either Wye or Open Delta configuration
as shown in Figure 2.6.
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