Power Transformers

PTI Power Transformers are designed and manufactured to meet specific customer requirements and specifications along with the applicable CSA, ANSI, NEMA, IEEE, IEC Standards. PTI prides itself in design flexibility which allows our products to be optimized to customer needs while continuing to meet the highest standards of quality and manufacturing techniques.

Small Power

Single Phase and Three Phase Small Power Transformers are available in a variety of configurations in accordance with the latest versions of CSA, ANSI, and IEC Specifications.

These transformers can also be customized to meet the requirements of individual industrial, commercial, and utility specifications.

The transformers can be provided with a variety of Terminations to meet customer requirements for new installations, replacement or retrofit situations.

A variety of Cooling Fluids are also available to meet the necessary flame retardent and/or environmental conditions.

Transformers are generally of Shell Type Construction and are available up to 5000kva and 69Kv Insulation Class.

Standard Features

All features listed as standard in the appropriate CSA, ANSI, or IEC Standard. These are generally as listed below.

  • Fully Mitred Step-Lap Core Design
  • Circular Coil Construction
  • Externally Operated De-Energized Tapswitch
  • Provision for Lifting and Jacking
  • Primary and Secondary terminations in the form of:
    • Cover Mounted Bushings
    • Sidewall or Cover Mounted Throats
    • Sidewall, Top or Bottom Entry, Cable Junction Boxes
  • Tank Base suitable for Hauling or Skidding
  • Stainless Steel faced Ground Pads
  • Standard Powder Coat Paint Finish
  • Standard Finish Colours:
    • ASA 70 Grey - (Munsell 5.0 BG 7.0/0.4)
    • Equipment (Dark) Green - (Munsell 9 GY 1.5/2.6)
    • Seafoam Green - (Munsell 4.82 G 4.07/3.35)
  • See page giving details of standard method of Radiator Mounting
  • Supplied with 55C, 65C, or dual 55/65C Temperature Rise. Look below to Table 2 for uprating details. For Cooling class designations table click here.
Table 1 - Standard Accessories

CSA C88

CSA C88

CSA C2

ANSI C57

ANSI C57

Accessory

Conservator Sealed <2500Kva >200Kv BIL

Conservator (a)

Yes No No No No

Non Dehydrating Breather

Yes No No No No

Pressure Relief Device (b)

Yes Yes No No Yes

Pressure Relief Device (c)

No No Yes No No

Liquid Level Gauge (d)

Yes Yes No No Yes

Top Oil Thermometer (e)

Yes Yes No No Yes

Drain Valve

Yes Yes No Yes Yes

Drain Plug

No No No No No

Sample Valve

Yes Yes No See (f) See (f)

Top Filter Valve

Yes Yes No Yes Yes

Vacuum/Pressure Gauge

Yes Yes No No Yes

Explanation Notes:
(a) Conservator is complete with Drain and Shut Off Valves
(b) This is the large automatic/self sealing emergency relief device
(c) This is the small manual/automatic relief device (50scfm @ 15psig)
(d) No contacts supplied up to 7500Kva
(e) Contacts supplied over 1000Kva
(f) Sample Device is part of the Drain Valve

Table 2 - ONAN/ONAF & 55/65C kVA Ratings

ONAN

ONAN/ONAF*

ONAN/ONAF*

OA/FA**

OA/FA**

Typical ONAN Kva Rating

55°/65°C*** 55°C 55°/65°C*** 55°C 55°/65°C***

@ 55°C

500

500/560 500/665 500/745 500/625 500/700

750

750/840 750/1000 750/1120 750/940 750/1050

1000

1000/1120 1000/1333 1000/1500 1000/1250 1000/1400

1500

1500/1680 1500/2000 1500/2235 1500/1875 1500/2100

2000

2000/2240 2000/2667 2000/2980 2000/2500 2000/2800

2500

2500/2800 2500/3325 2500/3725 2500/3125 2500/3500

3000

3000/3360 3000/4000 3000/4470 3000/3750 3000/4200

4000

4000/4480 4000/5333 4000/5960 4000/5000 4000/5600

5000

5000/5600 5000/6667 5000/7450 5000/6250 5000/7000

* - CSA Designation with 33% uprating with Fan Cooling
** - ANSI Designation with 25% uprating with Fan Cooling
*** - 55/65C Temperature Rating allows 12% uprating

Optional Features

All features listed as "optional extras" in the appropriate CSA, ANSI, or IEC Standard. These can include such items as listed below.

  • 50Hz designs
  • 55C or 55/65C temperature rise designs
  • Fan Cooling Package(s) for ONAF operation
  • Special designs for high Ambient Temperature site conditions
  • Special designs for high altitude, over 1000m, site conditions
  • Multiple Voltage Primary or Secondary Windings
  • Special de-energized Tap ranges
  • All copper winding designs
  • Alternate cooling liquids for less-flammable or environmental requirements
  • Primary and Secondary Lightning Arresters as Distribution, Intermediate, or Station Class
  • Lightning Arrester Discharge Counters
  • Primary, Secondary, and Neutral Current Transformers for Relaying or Metering Applications
  • On Load Tapchanging Equipment
  • Neutral Grounding Resistors
  • Winding Temperature Indicators
  • Sudden Pressure (Rapid Rise) Relay
  • Conservator Design
  • Gas Detector Relay
  • Silica Gel Dehydrating Breather
  • Detachable Cooling Radiators with Shut Off Valves
  • Pressure Vacuum Bleeder Device
  • Various contact arrangements on all devices and gauges
  • Water Coolers in lieu of traditional cooling radiators
  • Special designs to match existing equipment locations
  • Ground Fault Protection
  • Siesmic Boltdown and Certification
  • Special Paint Finishes for corrosive environments
  • Special Finish Colours

Many other features, protective devices, components, and variations are available upon request.

Typical Outline Drawing

 

Medium Power

Single Phase and Three Phase Medium Power Transformers are available in a variety of configurations in accordance with the latest versions of CSA, ANSI, and IEC Specifications.

These transformers can also be customized to meet the requirements of individual industrial, commercial, co-generation and utility specifications.

The transformers can be provided with a variety of terminations to meet customer requirements for new installations, replacement or retrofit situations.

A variety of cooling fluids are also available to meet the necessary environmental conditions.

Transformers are generally of Core Type Construction and are available up to base rating of 30MVA at 145kV with or without Load Tapchanging Equipment.

Standard Features

All features listed as standard in the appropriate CSA, ANSI, or IEC Standard. These are generally as listed below.

  • Externally Operated De-Energized Tapswitch
  • Provision for Lifting and Jacking
  • Primary and Secondary terminations in the form of:
    • Cover Mounted Bushings
    • Sidewall or Cover Mounted Throats
    • Sidewall, Top or Bottom Entry, Cable Junction Boxes
  • Tank Base suitable for Hauling or Skidding
  • Stainless Steel faced Ground Pads
  • Standard Powder Coat Paint Finish
  • Standard Finish Colours:
    • ASA 70 Grey - (Munsell 5.0 BG 7.0/0.4)
    • Equipment (Dark) Green - (Munsell 9 GY 1.5/2.6)
    • Seafoam Green - (Munsell 4.82 G 4.07/3.35)
  • See page giving details of standard method of Radiator Mounting
  • Supplied with 55C, 65C, or dual 55/65C temperature rise. Look below to Table 2 for uprating details. For Cooling class designations table click here.
Table 1 - Standard Accessories

CSA C88

CSA C88

CSA C2

ANSI C57

ANSI C57

Accessory

Conservator Sealed <2500Kva >200Kv BIL

Conservator (a)

Yes No No No No

Non Dehydrating Breather

Yes No No No No

Pressure Relief Device (b)

Yes Yes No No Yes

Pressure Relief Device (c)

No No Yes No No

Liquid Level Gauge (d)

Yes Yes No No Yes

Top Oil Thermometer (e)

Yes Yes No No Yes

Drain Valve

Yes Yes No Yes Yes

Drain Plug

No No No No No

Sample Valve

Yes Yes No See (f) See (f)

Top Filter Valve

Yes Yes No Yes Yes

Vacuum/Pressure Gauge

Yes Yes No No Yes

Explanation Notes:
(a) Conservator is complete with Drain and Shut Off Valves
(b) This is the large automatic/self sealing emergency relief device
(c) This is the small manual/automatic relief device (50scfm @ 15psig)
(d) No contacts supplied up to 7500Kva
(e) Contacts supplied over 1000Kva
(f) Sample Device is part of the Drain Valve

Table 2 - ONAN/ONAF & 55/65C Kva Ratings

ONAN

ONAN/ONAF*

ONAN/ONAF*

OA/FA**

OA/FA**

Typical ONAN Kva Rating

55°/65°C*** 55°C 55°/65°C*** 55°C 55°/65°C***

@ 55°C

500

500/560 500/665 500/745 500/625 500/700

750

750/840 750/1000 750/1120 750/940 750/1050

1000

1000/1120 1000/1333 1000/1500 1000/1250 1000/1400

1500

1500/1680 1500/2000 1500/2235 1500/1875 1500/2100

2000

2000/2240 2000/2667 2000/2980 2000/2500 2000/2800

2500

2500/2800 2500/3325 2500/3725 2500/3125 2500/3500

3000

3000/3360 3000/4000 3000/4470 3000/3750 3000/4200

4000

4000/4480 4000/5333 4000/5960 4000/5000 4000/5600

5000

5000/5600 5000/6667 5000/7450 5000/6250 5000/7000

* - CSA Designation with 33% uprating with Fan Cooling
** - ANSI Designation with 25% uprating with Fan Cooling
*** - 55/65C Temperature Rating allows 12% uprating

Optional Features

All features listed as "optional extras" in the appropriate CSA, ANSI, or IEC Standard. These can include such items as listed below.

  • 50Hz designs
  • 55C or 55/65C temperature rise designs
  • Fan Cooling Package(s) for ONAF operation
  • Special designs for high ambient temperature site conditions
  • Special designs for high altitude, over 1000m, site conditions
  • Multiple Voltage Primary or Secondary Windings
  • Special de-energized tap ranges
  • All copper winding designs
  • Alternate cooling liquids for less-flammable or environmental requirements
  • Primary and Secondary Lightning Arresters as Distribution, Intermediate, or Station Class
  • Lightning Arrester Discharge Counters
  • Primary, Secondary, and Neutral Current Transformers for Relaying or Metering Applications
  • On Load Tapchanging Equipment
  • Neutral Grounding Resistors
  • Winding Temperature Indicators
  • Sudden Pressure (Rapid Rise) Relay
  • Conservator Design
  • Gas Detector Relay
  • Silica Gel Dehydrating Breather
  • Detachable Cooling Radiators with Shut Off Valves
  • Pressure Vacuum Bleeder Device
  • Various contact arrangements on all devices and gauges
  • Water Coolers in lieu of traditional cooling radiators
  • Special designs to match existing equipment locations
  • Ground Fault Protection
  • Siesmic Boltdown and Certification
  • Special Paint Finishes for corrosive environments
  • Special Finish Colours

Many other features, protective devices, components, and variations are available upon request.

Typical Outline Drawing