Search results
Results From The WOW.Com Content Network
In electrical engineering, a transformer is a passive component that transfers electrical energy from one electrical circuit to another circuit, or multiple circuits.A varying current in any coil of the transformer produces a varying magnetic flux in the transformer's core, which induces a varying electromotive force (EMF) across any other coils wound around the same core.
Instrument transformers may also be used as an isolation transformer so that secondary quantities may be used without affecting the primary circuitry. [ 14 ] Terminal identifications (either alphanumeric such as H 1 , X 1 , Y 1 , etc. or a colored spot or dot impressed in the case) indicate one end of each winding, indicating the same ...
A current transformer has a primary winding, a core, and a secondary winding, although some transformers use an air core. While the physical principles are the same, the details of a "current" transformer compared with a "voltage" transformer will differ owing to different requirements of the application.
Formerly, distribution transformers for indoor use would be filled with a polychlorinated biphenyl (PCB) liquid. Because these chemicals persist in the environment and adversely affect on animals, they have been banned. Other fire-resistant liquids such as silicones are used where a liquid-filled transformer must be used indoors. Certain ...
An isolation transformer is a transformer used to transfer electrical power from a source of alternating current (AC) power to some equipment or device while isolating the powered device from the power source, usually for safety reasons or to reduce transients and harmonics. [1]
A special form of auto transformer called a zig zag is used to provide grounding on three-phase systems that otherwise have no connection to ground. A zig-zag transformer provides a path for current that is common to all three phases (so-called zero sequence current).
The Transformers animated series launched a decades-long toy and movie empire when it captured kids’ imaginations in 1984. As Key notes, “the fact that there were action figures and toys that ...
That's why you can use your cellphone safely when it is being charged, even if your cellphone has a metal shell and is connected to the secondary circuit. Operating at high frequency and supplying low power, power converters have much smaller transformers compared with those of fundamental-frequency, high-power applications.