Please use side menu if you cannot use dropdown boxes, or the header boxes
CAGE Code: 5DME2
ITAR Registration Code: M28889

- March 28th 2017 -
Call: 1 (800) 377-3244
We Are Open Monday-Friday 8 am - 5 pm PT

Single and 3-Phase 50/60 Hz, Dry and Oil-Filled Transformers

Distribution transformers are high power or high KVA (up to 1000 KVA or 1MVA) and are usually a step down electrical transformers used for the distribution of electric power. Distribution electrical transformer can be single phase or 3 phases, and usually mounted on a pad. These electrical transformers are either dry type or oil filled.

In the distribution of electrical power by the utility power generator, the high voltage transformers are used to do the transmission or distribution over large distances. The high voltages mean the current through the cables can be lower, and since the copper losses are square of the amperages, this will minimize the power loss over the great distances.

At the destination, these high voltage electrical transformers steps down into lower voltage and so that they are useable before it enters into a building.

CWS designs and manufactures high voltage transformers from 415 volts to 22,9000 volts, mainly in 3 phases. These electrical transformers ranges from 100 KVA to 1,000 KVA and are designed with amorphous cores or grain oriented silicon steel lamination cores.

Both dry and oil filled distribution electrical transformers using grain oriented silicon steel lamination are available from CWS.

Single Phase and 3 Phase Oil Filled Distribution transformers are fail-safe with a long life expectancy. The fluid used are Shell Diala or BP JS-V/JS-A which are extremely stable and long lasting.

Newer types of distribution electrical transformers that offers much energy savings during idling are designed and built using amorphous metals and nanocrystalline core materials. These types of distribution electrical transformer are also called Amorphous Metal Transformers (AMT).

AMT are built using very thin (0.25 micron thickness) foils made of Metglass or equivalent material. The main advantage of amorphous core electrical transformer is the core loss, which is about 75% less than a conventional silicon iron lamination core.

In an electrical transformer, there are 2 classes of losses that determine the efficiency, core loss and copper loss. Core loss is the losses due to the core material during the electrical voltage transformation and is dependent on the flux density of the core. Core loss is not dependent on the amount of current flowing into the transformer.

Copper loss, on the other hand, is due to the I2R losses (ampere squared multiple by winding resistance). So the higher the current, the higher is this copper loss. Amorphous core electrical transformer therefore has much higher efficiency at low or no load (idling), and not as efficient as silicon steel lamination electrical transformer at full load. This is mainly because of its lower maximum flux density requiring more copper windings. To compensate for this, AMT is built larger in size to compensate of this flux density deficiencies.

CWS designs and built many amorphous core transformers for the oil field industries and a major customer who purchase CWS amorphous transformer is Shell Oil Corporation in Houston.

Disclaimer: Coil Winding Specialist, Inc., its affiliates, agents, and employees acting on behalf of Coil Winding Specialist, Inc. (collectively, CWS) disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. CWS reserves the right at any time and from time to time to make changes to design, technical specification, or construction of any product listed on this website without notice. CWS also reserves the right to discontinue or limit sale of any product or service available throughout this website on temporary or permanently basis without notice. CWS highly recommends customers not to use its products offered on this website for inappropriate use and applications. Products should be tested for its suitability by prospective customers in all possible applications and conditions. Customers using or selling CWS products for use in other than recommended applications do so entirely at their own risk and agree to fully indemnify CWS from any damages arising or resulting from such use or sale.

Any Comments, Suggestions or Questions? Contact us! Email:
CWS 353 West Grove Ave. Orange, California 92865
Call us Toll Free: 1-800-679-3184 or 1 (800) 377-3244

Tel: (714) 279-9010, Fax: (714) 279-9482

Copyright 2008, Coil Winding Specialist, Inc
Updated July, 2013

CAGE Code: 5DME2(Registered with