1.2kV thru 44kV Class

Dry-Type Medium Voltage (Power)

Distribution Transformer

Typical Specification

CANADA

CSI-2004 (Section 26 12 16) Page 1 of 4 SPS# 25, Rev: 02

Canada

595 Southgate Drive

Guelph, Ontario

N1G 3W6

Phone: 1-888-798-8882

Fax: 1-519-822-9701

CSI-2004 (Section 26 12 16) Page 1 of 4 SPS# 25, Rev: 02

E-mail:

1GENERAL

1.1SCOPE

AThis section defines dry-type, enclosed and ventilated medium voltage(power) transformers as indicated.

BTransformers shall be designed, constructed and rated in accordance with CSA and NEMA/ANSI standards.

CTransformers shall be designed, constructed and rated (where applicable) in accordance with the Canadian Energy Efficiency Regulations (SOR/94-651); for medium voltage, dry-type distribution transformers.

1.2RELATED DOCUMENTS

ADrawing and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section

1.3REFERENCES

AANSI C57.12.01, C57.12.91, C57.110 for non-linear loads, C57.18.10 for rectifier duty, CSA C9

BCSA C22.2 No. 47, UL 1562

CNEMA ST-20

DCanadian Energy Efficiency Regulations (SOR/94-651)

1.4SUBMITALS

ASubmit shop drawing and product data for approval and final documentation in the quantities listed according to the Conditions of the contract.

iCustomer name. Customer location and customer order number shall identify all transmittals.

iiProduct Data including KVA rating, Temperature Rise, Detailed enclosure dimensions, Primary & Secondary nominal voltages, primary voltage taps, no load & full load losses, impedances, unit weight, warranty; Efficiency (where applicable) per Canadian Energy Efficiency Regulations (SOR/94-651).

1.5STORAGE AND HANDLING

AStore and handle in strict compliance with manufacturer’s instructions and recommendations. Protect from potential damage from weather and construction operations. Store so condensation will not form on or in the transformer housing and if necessary, apply temporary heat where required to obtain suitable service conditions.

BHandle transformer using proper equipment for lifting and handling, use when necessary lifting eye and/or brackets provided for that purpose.

1.6WARRANTY

AThe transformer shall carry a 1 year limited warranty.

(For details, refer to the manufacturers published warranty)

2PRODUCTS

2.1General construction:

ATransformer core shall be manufactured from quality non-aging, cold rolled, fully processed silicon steel laminations. Cores are to be precisely cut to close tolerances to eliminate burrs and improve performance. Typically they would be step-lap, fully mitered construction for optimum energy efficiency and low noise level. Cores are to be carefully assembled and rigidly held secure with structural steel clamps to minimize gaps. Glass resin I beams that can withstand 2000lbs per square inch shall be used as blocking coil supports for superior resistance to axial short circuit forces.Primary and secondary terminations to be mounted on separate insulated supports.

2.2Voltage and kVA Requirements:

APrimary Voltage: [44000][34500][25000][13800][12470][6900][4160][2400][1200][other]

BPrimary Voltage BIL Rating: [10][20][30][45][60][95][110][125][150][other]

CSecondary Voltage: [120/208][277/480][347/600][other]

DSecondary Voltage BIL Rating: [10][20][30][45][other]

EkVA rating: [750][1000][1250][1500][2000][2500][3000][4000][5000][7500][other]

FSystem Frequency: 60 [50] [other] Hertz

2.3Key Requirements:

AThe manufacturer will provide third party test results verifying short circuit capability on the standard design construction concept used by the manufacturer.

BThe following production tests must be completed on all transformers. Pass fail criteria will be per ANSI C57.12.01 and C57.12.91.

iPolarity

iiRatio

iiiResistance of coils

ivInsulation resistance test

vPower frequency voltage-withstand tests on each winding.

viInduced voltage test

viiNo load loss

viiiLoad loss

ixImpedance test

CFor the following type tests please refer to job-specific data sheet.

iTemperature rise test

iiBIL

iiiPartial Discharge

ivSound level

DStandard impedance at 60Hz: [5% to 8.5%] [other]

EName Plate Rating: Linear load, 60Hz

2.4Basic Requirements:

AThree-phase, common core construction. Convection air cooled [Fan Cooled]

BAverage winding rise by resistance shall not exceed 150 °C [115°C] [80°C] in a maximum 40 deg. C ambient.

CEfficiencies: (where applicable)

iMeets or exceedsCanadian Energy Efficiency Regulations (SOR/94-651)efficiencies at 50% of rated load on units having a primary voltage BIL rating greater than 1.2kV.

iiEfficiencies are calculated under a linear load profile.

iiiEfficiencies, no-load losses, load losses and impedance values will be calculated at temperature reference of 75°C at Unity Power Factor (UPF).

ivRefer to the Canadian Energy Efficiency Regulations for product exemption criteria.

DFour high voltage taps shall be provided;two at 2.5% FCAN and two at 2.5% FCBN. Off circuit tap selection shall be by tap links.

EImpregnation: vacuum impregnated polyester resin.

FSound level to meet NEMA ST-20

GEnclosure: ventilated NEMA 1, [NEMA 2][NEMA 3R][NEMA 3R c/w filters][totally enclosed] [other].

HEnclosure Finish: [ANSI 61 Grey][ANSI 61 Greysuitable for UL50 outdoor applications][other].

IAnti-vibration pads/isolators shall be used between the transformer core and coil and the enclosure.

JCSA approved.

Options:

  • Fan mounted provisions only for future forced air-cooling.
  • Forced air-cooling. 120V Power will be supplied/ not supplied.
  • Forced air cooling with 30% overload capacity without exceeding natural cool kVA rating.
  • Taps shall be FCAN XX%., FCBN XX%, and RCBN XX%.
  • Lightning arrestors: Station class, Intermediate class or Distribution class.
  • A grounding resistor shall be provided. (Rating to be specified by customer.)
  • A Neutral Ground Monitor shall be provided.
  • Thermometers: [dial 2 contacts][dial 3 contacts][4-20mA o/p thermocouple input][other]
  • Trip Thermostat (1 per phase): [N.O. 200°C][N.C. 200°C][other]
  • Alarm Thermostat (1 per phase): [N.O. 180°C][N.C. 180°C][other]
  • Nameplate shall be Aluminum or Stainless Steel.
  • A Kirk key interlock to prevent unauthorized access shall be provided. (Option: Kirk key interlock with indicating signal light that indicates doors are open shall be provided).
  • A current transformer on the HV or LV windings shall be provided to the specification in job-specific data sheet. (customer to provide ratio and accuracy requirement)
  • An electrostatic shield shall be provided.
  • Transformer shall be designed to handle the current harmonics provided in job-specific data sheet.
  • Duty Cycle shall be to attached job-specific data sheet.
  • Potential transformer shall be provided to the specification provided in job-specific data sheet.(customer to provide ratio and accuracy requirement)
  • A strip heater powered from separate source shall be provided.
  • Seismic: Meets all seismic parameters for IBC 2009 and NBCC 2005 for ground level installations only for all locations in North America.
  • Anti-vibration options: [Anti-vibration Pads][Super W Pads][Spring Isolators][Springs & Snubbers]
  • Low Sound Level: [-3 dB][ -5 dB][-8 dB][other]
  • Manufacturer has the ability to guarantee EMF levels as low as 10mG on the enclosure top and four sides from a distance of 1 meter for most units and kVA ranges. (Contact manufacturer for details on pricing and availability.)
  • SPD (Surge Protection Device)
  • Rolling and Skidding Base: [2 directions] [4 directions].
  • Provision for Lifting and Jacking.

2.5Acceptable Product and Manufacturer:

AHammond Power Solutions Inc. (Canada: 1-888-798-8882).

BSubstitutions are permitted, subject to meeting all requirements of this specification and also having written approval by engineering 10 days prior to bid closing.

3EXECUTION

3.1Installation

AThe installing contractor shall install the Dry-Type Medium Voltage (Power) Transformer per the manufacturer's recommended installation practices as found in the installation, operation, and maintenance manual and comply with all applicable codes.

BMake sure that the transformer is level.

CThe transformer shall be mounted on a concrete pad unless otherwise indicated.

DCheck for damage and loose connections.

EMount transformer on suitable isolation pad to minimize vibrations.

FInstall seismic restraint where indicated on the drawing.

GCoordinate all work in this section with all work of other sections.

HTake Infrared Picture to verify connections accuracy or deficiencies.

IPrior to energizing transformer, verify secondary voltages and if necessary adjust secondary taps.

JReport of the Commission of the transformer shall include:

iPrimary & Secondary Voltages

iiPrimary & secondary THDi & THDv

CSI-2004 (Section 26 12 16) Page 1 of 4 SPS# 25, Rev: 02