Closeup of singlephase polemount transformer. This is a picture I took of the singlephase polemount transformer supplying my parents' cottage on Old Lakeshore Road, about 12 miles from Dunville Ontario. The transformer supplies their 200A electric service, as well as the electric services of various other cottages along that road. This image (Nikon D2h with wearable computer system), has been downcompressed to get it within the 100k

IEEE C57.12.00 C57.12.20 ANSI C57.12.00 C57.12.20 IEC 76 GB10318

Pole-mounted distribution transformer with center-tapped secondary winding used to provide 'split-phase' power for residential and light commercial service, which in North America is typically rated 120/240 V

Pole mounted Polemount single phase closeup transformer

Summarization

The single-phase pole-mounted distribution transformers are specifically designed for the decentralization distribution network of servicing residential overhead distribution loads of town and countryside. They are also suitable for light and diversified power applications. These transformers are designed for the application conditions normally encountered on electric utility power distribution systems.

Offers 2 basic transformer types and 2 kinds of metal core types Conventional type and Complete Self Protect type, and for the transformer core, 2types of materials are available: C.R.G.O. core and amorphous metal core.

Standards

IEEE C57.12.00 C57.12.20 ANSI C57.12.00 C57.12.20 IEC 76 GB10318

Feature of outer structure

(1) Cover mounted high voltage porcelain bushing with eyebolt terminal are mounted on flat embossments on the cover and have undercut gasket seats for improved sealing. The eyebolt connectors are cast bronze plated with tin to accommodate both aluminum and copper conductors.

(2) One-piece fasten ring prolongs the life of the transformer, facilitates inspection and maintains even pressure around the entire rim. It combines with a specially formed tank rim, drawn cover and gasket to form an effective seal which will not deteriorate with age.

(3) Low voltage tank-wall bushing terminals are clamp type and tinplated.

(4) Tank is equipped with self-sealing pressure release device.

(5) Support lugs, welded to the tank, conform to ANSI standards are made of hot-rolled steel.

(6) Tank is supplied with a tank grounding bolted ring-type connector suitable for use with copper or aluminum.

Conventional Type

The transformer is cylinder sealing structure. Each one is fixed with grounding devices, hooks, support lugs which conforms to ANSI standard, and one or two high voltage bushing on the cover, low voltage bushing on the wall of the tank and eyebolt connecting terminals. The tap changer should be adjusted basing on the instruction after the power off.

Complete Self Protect Type

This type of transformers are CSP type, which can protect itself from thunder and lighting, short circuit and protect the transiting and distribution line from current failure because of self-malfunction.

Except from some similarities such as cylinder tank, hooks, lifting lugs, grounding devices, nameplates, core and winding with the conventional type. This type of transformers have characteristics and devices as follows:

One or two high voltage bushings are on the cover with fuse.

One or two high voltage arresters are installed on the wall of the tank, whose top end is near to the high voltage bushing, and connected to the bushing by a copper strip. One secondary breaker switch is above the winding inside the tank,and here are operating handle, overload reset and signal light

Low voltage bushing is educed from the wall of the tank, grounding device is fixed to position X2. One end of the single bushing leads out through the high voltage bushing, the other end is ground connection.

Core:C.R.G.O. core and amorphous metal core can be chosen.

Pole Mounted Transformers, Rating Details
General technical information is listed below. Information on less
common requirements can be obtained through your ABB sales
representative.
− kVA: 10, 15, 25, 37, 50, 75, 100, 167
− Temperature rise : 65 °C
− Cooling type : ONAN
− Single Phase
− Hertz : 60, 50
− Polarity : Additive or Subtractive
− Primary Voltage : 2400V through 34500 GrdY / 19920V
− Secondary Voltage : 120 / 240V, 240 / 480 V, 347V, 600V
− Insulation Class : 25kV (150kV BIL) and below
− Taps: none, or as an option, 4 x 2,5% HV (any combination of full capacity above nominal and /or reduced capacity
below nominal)
Options
− Four HV winding taps complete with externally operated
tapswitch
− Dual voltage primary complete with externally operated voltage switch
− Extra creep bushing
− Surge arrester bracket
− Internal Fault Detector (IFD)
− Non conductive transformer cover
− Biodegradable vegetable oil (BIOTEMP®)
− Stainless steel tank and cover