Category: 10. Transformers

Audio Transformers are designed for use in audio amplifier applications for coupling and impedance matching of amplifiers and speakers. As well as stepping up (increase) or stepping down (decrease) a signal voltage, transformers also have one very other useful property, isolation. Since there is no direct electrical connection between their primary and secondary windings, transformers provide…

Three-phase Transformers are the backbone of electrical power distribution whether Delta or Star connected windings. A three-phase electrical system in used to generate and transmit electric power over long distances for use by offices and industry. Three-phase voltages (and currents) are raised or lowered by means of three phase transformers as the three phase transformer…

Current Transformers produce an output in proportion to the current flowing through the primary winding as a result of a constant potential on the primary. The Current Transformer ( C.T. ), is a type of “instrument transformer” that is designed to produce an alternating current in its secondary winding which is proportional to the current being measured in its…

The primary and secondary windings of an Autotransformer are linked together both electrically and magnetically reducing the cost over conventional transformers. Unlike the previous voltage transformer which has two electrically isolated windings called: the primary and the secondary, an Autotransformer has only one single voltage winding which is common to both sides. This single winding is “tapped”…

Multiple Winding Transformers can have two or more primary or seconday winding allowing for different combinations of voltages and currents. Multiple Winding Transformers generally have one single primary winding with two or more secondary windings. But the beauty of transformers is that they allow us to have more than just one winding in either the…

Transformers can provide a voltage on their secondary winding but to transfer electrical power between their input and output they need to be loaded. In the previous transformer tutorials, we have assumed that the transformer is ideal, that is one in which there are no core losses or copper losses in the transformers windings. However,…

A simple two-winding transformer construction consists of each winding being wound on a separate soft iron limb or core which provides the necessary magnetic circuit. A transformer construction provides a magnetic circuit, known more commonly as the “transformer core”, which is designed to provide a path for the magnetic field to flow around. This magnetic…

Transformers are electrical devices consisting of two or more coils of wire used to transfer electrical energy by means of a changing magnetic field. In this tutorial about transformer basics, we will se that a transformer has no internal moving parts, and are typically used because a change in voltage is required to transfer energy…