GE Servicenter Mini-unit substation User manual

1
INSTALLATION INSTRUCTIONS
Servicenter™mini-unit substation
Three-phase 22.5 kVA models
Receiving
Upon receipt of shipment, examine the
package for any damage that may have
occurred in transit. While unpacking,
examine the unit for broken, bent, loose
parts, or other damage. If injury from
outside sources is evident, file a damage
claim with the transportation company
and notify the nearest sales office.
Storage and handling
The storage area should be clean. Before
placing the unit in service after a period of
storage, be sure it is clean and dry by
observing the instruction under
“Installation”. The unit may be fork truck
lifted or raised by the lifting holes located
on the top core clamps under the
transformer cover.
Installation preparation and mounting
If the interior moisture is evident by the
appearance of rust, the unit should be
dried. Megger readings of 10 Megohms
minimum should be obtained before
installation. Free circulation of air is
essential for proper operation of the unit.
The servicenter will perform at its rated
output when surrounding air does not
exceed 40 °C (105 °F) and adjacent
structures permit free movement of
cooling air. The unit must be mounted
upright.
Connections
NOTE: Do not make or change
connections while unit is
energized!
The unit must be mounted upright.
Reference should be made to the wiring
diagram (Figure 1) when making
connections.
A new grounding electrode conductor is to
be connected to the neutral bar of the
secondary in accordance with the National
Electrical Code.
If a primary terminal strip is bonded to the
enclosure by means of the neutral bonding
screw, it may be removed for special
applications.
Make certain that all connections are
electrically tight to prevent joint heating.
If aluminum cable is used, adequate
preparation of the aluminum cable and
protection of the joint is essential.
Secondary branch circuit breaker ampere
ratings and branch circuit conductor sizes
must be selected in accordance with the
National Electrical Code.
The servicenter is factory connected on
the primary side for the nominal rated
three-phase delta connected input
voltage. If the primary input voltage is
other than nominal, the transformer taps
may be adjusted in accordance with
instructions provided with the
transformer.
The primary main breaker and the
secondary main breaker may be changed
using breakers of equal voltage ratings
and “equal to” or “lower” current ratings.
However, the use of primary breakers with
current ratings lower than those supplied
may result in nuisance tripping. This is due
to in-rush currents in the primary winding
which occur when the transformer is
energized.
NOTE: Primary and secondary
breakers with current ratings
higher than those supplied must
not be used.
After all electrical connections have been
made and the required branch circuit
breakers installed, the inside metal cover
plate must have the corresponding branch
circuit breaker knockouts removed and
the cover-plate reinstalled. Fasten the
cover-plate in place, being sure that no
cables are caught between the cover-plate
and the framework. Also, ensure that all
breakers are aligned with the knock-out
holes in the cover-plate. Branch circuit
positions should be recorded on the
identification labels provided.
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Servicenter mini-unit substation

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1TQC1930E0005 IS REV.A DEC.2020 (475A484AAP001 - REV 003)
—
We reserve the right to make technical
changes or modify the contents of this
document without prior notice. With regard
to purchase orders, the agreed particulars
shall prevail. ABB Inc. does not accept any
responsibility whatsoever for potential
errors or possible lack of information in
this document.
We reserve all rights in this document and in
the subject matter and illustrations
contained therein. Any reproduction,
disclosure to third parties or utilization of
its contents – in whole or in parts – is
forbidden without prior written consent of
ABB Inc. Copyright© 2020 ABB
All rights reserved
—
ABB Inc.
305 Gregson Drive
Cary, NC 27511
electrification.us.abb.com
GE is a trademark of GE.
Manufactured by ABB Ltd under license
from General Electric Company.
After the inner cover is in place, the unit
should be energized and breaker operation
checked out by operating the circuit breakers.
Verify correct output voltage and polarity.
The outer cover should then be closed and
secured. Padlock mounting holes are
provided and may be used to secure the
outer cover of the unit.
Loading
Loads may be applied either from line-to-line
or from line-to-neutral. Care should be taken
to balance the loads, if possible.
Do not exceed the rated current on any
transformer phase where:
Current = Nameplate kVA or Current = kVA .
208 X sqrt 3 120 X 3
Preventive maintenance
The only preventive maintenance required is
periodic inspection of connections, operation
of circuit breakers, and removal of
accumulated interior dust, dirt and lint.
Renewal parts
Field repairs are usually uneconomical except
for replacement of the circuit breakers. No
spare parts or renewal parts are
recommended. If conditions of operation
dictate the need for standby equipment, a
complete spare unit is recommended.
Wiring diagrams
SERVICE CENTER MINI-UNIT SUBSTATION
INSTRUCTION AND INSTALLATION SHEET
(Three-Phase - 22.5 kVA Models)
FIGURE 1 - TYPICAL WIRING DIAGRAM
DO NOT MAKE OR CHANGE CONNECTIONS
WHILE UNIT IS ENERGIZED !!
Page 2 of 2
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Figure 1 - typical wiring diagram
NOTE: Do not make or change connections
while unit is energized.
H1
1 2
(3) (4)
5 6
7 8
(9)
(15)
(10)
(16)
11
17
13
12
18
14
7 6 5 4 3 2 1 7 6 5 4 3 2 1 7 6 5 4 3 2 1
H2 H3
X1
H1
NEUTRAL IS BONDED
TO ENCLOSURE BY
USE OF BONDING
SCREW
SECONDARY MAIN
3-POLE TYPE THQL
70A, 240V
PRIMARY MAIN
3-POLE TYPE TED
70A, 480V
GROUND
WHEN
REQUIRED
SECONDARY
MAIN
BREAKER
PRIMARY
MAIN
BREAKER
H2
LINE
1
LINE
3
LINE
2
H3
X2
X0 X1 X2 X3
X3
NEUTRAL
NEUTRAL
N, XO