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EMF equation of transformers lets you calculate the RMS values of induced voltages in the primary and secondary windings of a transformer. An alternating voltage, when applied to the primary of a transformer, produces an alternating magnetic field which induces EMF in the secondary windings. The produced magnetic flux is alternating in nature and lags … Read more
An electric motor converts electrical energy to mechanical energy. In general, an electric motor consists of a stator, a rotor, winding, bearings, and casing. The motor rotates due to the force of attraction or repulsion between the stator or rotor fields. This article provides you an overview of the parts of a motor. Parts of … Read more
Induction motors are robust and reliable and are used in all industries across the globe. Various methods are followed to start induction motors, out of which star-delta starters are the most commonly used ones to reduce the starting current. Star-delta starters are cheaper than soft-starters and are widely seen in small-scale industries. Typically, star-delta starters … Read more
A magnetic core and windings are two basic parts of a transformer. The windings are wound over the core and the core encircles the windings. Based on the way the core and the winding are made, transformers are classified into two types: Core type and shell type transformers. Both of them refers to the arrangement … Read more
A transformer is the device that makes power systems flexible, scalable and help save cost by reducing power loss. Here you can learn the selection and sizing of transformers and code & standards related to transformers. Transformer Nameplate Selection and sizing of a transformer is the process of determining the basic transformer parameters such kVA, … Read more
An autotransformer is a single-winding electrical transformer. It is also known as variac or dimmer stat. It is made of a single-winding coil. This single-winding setup makes them cheaper, more efficient, and have better voltage regulation than normal transformers. They are much more useful in cases in which the voltage ratio is less than 2 … Read more
The basic parts of a transformer are the core, the primary winding, and the secondary winding. Apart from these, there are various other components such as insulation, transformer oil, cooling arrangements, protection relays, enclosure, etc present in larger transformers. Let’s discuss the working principle of a transformer before diving into the topic. Transformer – Principle … Read more
What are K-factor rated transformers? K-factor rated transformers are capable of withstanding the heating effects caused by harmonic load currents. They are specially designed for non-linear harmonics generating loads. It is defined in the ANSI/IEEE C57.110 standard. Electronic circuits, switched-mode power supplies and semiconductor switches draw a large amount of non-linear current causing distorted current. … Read more
A certain amount of current is drawn by a transformer from the source connected to it primary even when no load is connected to its secondary. A part of this current is used to create flux in the transformer core. This current is known as magnetization current. Definition of magnetization current Magnetization current can be … Read more
Transformer inrush current or magnetization inrush current is a transient input current drawn by a transformer during its energization. Depending on several factors, the magnitude of the magnetization inrush current can be somewhere from 5 to 30 time the rated full load current of the transformer. This happens even when the transformer is energized at … Read more
