University of Manitoba
DISTRIBUTION-TRANSFORMERS
LIQUID COOLED EXTERIOR MOUNTED
Section 16321
Req. #
1.1
Page 1
RELATED WORK
.1
Basic Electrical Materials and Methods
.2
Wiring and Cable
Section 16050
Section 16120
1.2
Standards
.1
CAN/CSA-227.2-88. The transformers shall comply with the most recent revision of CSA
Standard C227.4-M1978; (Three-Phase Dead Front Pad-mounted Distribution Transformers).
1.3
SOURCE QUALITY CONTROL
.1
Submit Production Test Certificate to Consultant.
1.4
SHOP DRAWINGS
.1
Submit shop drawings in accordance with Section 16050.
.2
Indicate:
.1
Dimensioned positions of mounting devices.
.2
Dimensioned positions of terminations.
.3
Identified internal and external component layout on assembly drawing.
.4
Insulating liquid capacity.
1.5
MAINTENANCE DATA
.1
Provide maintenance data for liquid cooled transformers for incorporation into manual
specified in Section 16050.
.2
Include insulating liquid maintenance data.
1.6
DELIVERY AND STORAGE
.1
Ship transformer empty, with first full of liquid shipped separately for field filling. Manufacturer
shall supply manpower and all equipment required for filling.
.2
Ship transformer pressurized with inert gas.
1.7
TRANSFORMER CHARACTERISTICS
.1
General: The Transformers shall be three-phase, oil-filled, self-cooled type ONAN. They shall
be of radial feed, dead-front design with (3) three externally clamped primary bushing wells
complete with inserts for connection to elbow-terminated high voltage cables. Secondary
bushings shall be epoxy type complete with NEMA 4-hole spades. (Provide price adder for
Bay-0-Net expulsion fuses.)
.2
Transformers: to CSA C2-M1982.
.3
Liquid cooled, outdoor, distribution transformer type ONAN.
.4
Primary voltage: 4160V, 60 Hz, 3ø, 3W.
.5
Secondary voltage: [347/600V,] Y connected, 3 phase, 4 wire, grounded neutral suitable for
delta-Y connection.
.6
Capacity: [500] kVA.
.7
Basic impulse level: 60 kV; primary: 30 kV secondary.
.8
Impedance: not less than 5.5%, nor more than 6.5%.
.9
KVA: [500] Phase: 3 Primary Voltage: 4l60 Delta Secondary Voltage: [600V/347] Bil:
Primary: 60kV: Secondary: 30kV Taps: Standard 4-2.5% +(-) Temperature Rise: 65°C.
.10
Windings: Copper
2.1
MOUNTING
.1
Transformers suitable for pad mounting.
2.2
VIBRATION DAMPERS
.1
Interior anti-vibration mountings to isolate not less than 90% of disturbing vibrations.
2.3
VOLTAGE TAPS
Date revised December 18, 2012
University of Manitoba
DISTRIBUTION-TRANSFORMERS
LIQUID COOLED EXTERIOR MOUNTED
Section 16321
Req. #
Page 2
.1
Four 2.5% taps, 2-FCAN, 2-FCBN.
2.4
TAP CHANGER
.1
Externally operated off-load tap changer, with provision for padlocking.
2.5
HIGH VOLTAGE BRUSHINGS
.1
Bushings: to EEMAC L9-2, 1979.
2.6
INSULATION LIQUID
.1
Insulating liquid: transformer oil.
2.7
ACCESSORIES
.1
Oil sign gauge.
.2
Provision only for installation of a Kirk-key interlock in the access door.
.3
If Bay-O-Net fuses are provided, the access compartment shall be provided with a full “fliptop” roof to facilitate removal of the fuses.
.4
Anchor devices, setting templates and means for bolting down to rails.
.5
Bi-directional skid base.
.6
Factory install accessories.
2.8
FINISH
.1
Finish tank exterior in accordance with Section 16050 - Electrical General Provisions. A high
quality, two component isocyanate-free acrylic coating is required. Color shall be equipment
grey.
2.9
EQUIPMENT IDENTIFICATION
.1
Provide equipment identification in accordance with Section 16050 - Electrical General
Provisions on Size #1.
Line 1 – Transformer ID.
Line 2 - Building Name & KVA Rating.
Line 3 – Primary Voltage & wires / Secondary Voltage & Wires.
Line 4 – Fed from Panel & Room Number.
2.10
WEATHERPROOF
.1
All equipment and ancillary devices shall be weatherproof and suitable for ± 40°C (-40°F104°F) ambient temperatures.
3.1
INSTALLATION
.1
Install transformers only after other work in area is completed and in accordance with
manufacturer’s instructions.
.2
Use spreader bars on slings when lifting transformers into place.
.3
Set and secure transformer in place, rigid, plumb, square.
.4
Ensure internal connections are mechanically tight.
.5
Make connections.
.6
Connect transformer ground terminal to system ground.
.7
Set taps to produce rated secondary voltage at no-load (347/600V).
4.1
TESTS
.1
The following tests shall be made in accordance with the National Standard of Canada
Specification CAN3-C-88-M79 for power transformers and reactors:
.1
Resistance measurements of all windings on the rated voltage connection and at the
tap extremes.
.2
Ratio tests on the rated voltage connection and on all tap connections.
Date revised December 18, 2012
University of Manitoba
DISTRIBUTION-TRANSFORMERS
LIQUID COOLED EXTERIOR MOUNTED
Section 16321
Req. #
Page 3
.3
.4
.5
.6
.7
.8
.9
.10
.11
4.2
Polarity and phase relationship tests.
Existing current and loss on the rated voltage connection at rated voltage and 110 per cent of
rated voltage.
Impedance and load loss at rated current on the rated voltage connection of each unit and on
the tap extremes.
Applied potential tests from each winding to ground and to the other windings.
Induced potential tests to test turn-to-turn and line-to-line insulation and, in the case of graded
insulation, line-to-ground insulation.
Pressure tests to establish the integrity of the tank
and cooling system.
Operational tests to show the correct functioning of all devices associated with the
transformer.
Insulation tests on auxiliary devices and wiring.
Core insulation tests.
SUBMISSION
.1
Submit test results to Consultant and include in Maintenance Manuals.
Date revised December 18, 2012