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An electrical transformer in which the primary and secondary coils have some or all windings in common.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Electrical Engineering) a transformer in which part of the winding is common to both primary and secondary circuits
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌɔ toʊ trænsˈfɔr mər)

a transformer having a single coil that serves as both a primary coil and a secondary coil.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
With the help of the loan, NTDC is going to purchase autotransformers and shunt reactors for its high voltage transmission lines and grid stations.
The EACC is also investigating Kenya Pipeline over alleged irregular payment of Sh30 million to Redline Limited for the supply, installation and commissioning of three autotransformers.
The project envisages the purchase, supply, installation and commissioning of six single-phase autotransformers instead of similar equipment installed at the transformer substation of this hydroelectric station over 40 years ago, which has developed a service life and are in poor technical condition.
He covers magnetism, magnetic induction, inductance in alternating-current circuits, single-phase isolation transformers, autotransformers, current transformers, three-phase circuits, three-phase transformers, single-phase loads for three-phase transformers, transformer installation, transformer cooling, transformer maintenance, harmonics, direct-current generators, direct-current motors, alternators, three-phase motors, single-phase motors, motor maintenance and troubleshooting, motor nameplate data, and motor installation.
One substation contains three single-phase autotransformers with a capacity of 167.3 MVA each, which makes them the largest transformers for mobile substations ever built at Siemens.
ABB will also deliver two 400/132 kV autotransformers to step down the voltage for distribution to, and advanced IEC 61850-compliant open automation, protection and telecommunication systems for local and remote control and monitoring of substation assets.
Two autotransformers of 250 MVA each and the relevant equipment totaling $8.23 million arrived in Bishkek, according to the press service of the Power Plants JSC.
Request of international offers to supply autotransformers for the Romanian & Semaf made passengers suburbs coaches.
- construction of Datka-Kemin power transmission line and Kemin substation with additional installation of autotransformers on Datka and Kemin substations,
Apart of typical standard components, the scope of work also includes civil works & erection of three single phase 167 MVA autotransformers plus one spare unit including their accessories & 11 KV bus ducts (supplied under package B).