High Voltage Transformers

High voltage transformers are normally used in high voltage labs for testing purpose. This transformer is subjected to transient voltages and surges during their normal operation when the insulation under test breaks down. To withstand these impulse voltages, the insulation of these transformers must be carefully designed. These are usually single phase, core type transformers. … Read more

Distribution Transformer | All Day Efficiency of Distribution Transformer

Distribution Transformer The step down transformers used for electric power distribution purpose are referred as distribution transformer. There are several types of transformer used in the distribution system. Such as single phase transformer, three phase transformer, pole mounted transformer, pad mounted transformer, and underground transformer. Distribution transformers are generally small in size and filled with … Read more

Step Up Transformer

A transformer is static electrical equipment which transforms electrical energy (from primary side windings) to the magnetic energy (in transformer magnetic core) and again to the electrical energy (on the secondary transformer side). The operating frequency and nominal power are approximately equal on primary and secondary transformer side because the transformer is a very efficient … Read more

Step Down Transformer

Transformers are able to work in two regimes, as voltage step-up and voltage step-down transformers. The step-up transformers are described in our previous page. A step-down transformer converts the high voltage (HV) and low current from the primary side to the low voltage (LV) and high current value on the secondary side. This transformer type … Read more

Electrical Power Transformer | Definition and Types of Transformer

Definition of Transformer A transformer is a static machine used for transforming power from one circuit to another without changing frequency. This is a very basic definition of transformer. Since, there is no rotating or moving part, so a transformer is a static device. Transformer operates on an ac supply. A transformer works on the … Read more

What is an Autotransformer?

An autotransformer is a kind of electrical transformer where primary and secondary shares same common single winding. So basically it’s a one winding transformer. Autotransformer Theory In an auto transformer, one single winding is used as primary winding as well as secondary winding. But in two windings transformer two different windings are used for primary … Read more

Tertiary Winding of Transformer | Three Winding Transformer

What is Tertiary Winding? What is Three Winding Transformer? In some high rating transformer, one winding in addition to its primary and secondary winding is used. This additional winding, apart from primary and secondary windings, is known as Tertiary winding of transformer. Because of this third winding, the transformer is called three winding transformer or … Read more

What is Earthing Transformer or Grounding Transformer

Stability on External Earth Fault(E/F) on Delta Side of Star-Delta Power Transformer If the earthing transformer on the Delta Side is outsides the Zone of protection the Earth Fault(E/F) in the delta system outside Current Transformer (CT) locations would produce current distributions as shown which circulate within the differential CT secondaries and is kept out … Read more

Toroidal Transformer

The small transformers used in commercial electrical devices as TV, computers, audio systems can be built from two different core shapes: EI or square shape and toroidal shape. In the past, the EI core shape was more popular. Nowadays, because of their important advantages, the toroidal transformers become very large majority in applications where the … Read more

Isolation Transformer

Transformers are electromagnetic devices which transform alternating current (AC) electrical energy from primary to secondary side. The energy is transformed with equal frequency and approximately equal power by means of the transformer core magnetic field. Thus they provide galvanic isolation in the electrical system. The isolation transformers operate in the same way as other transformer … Read more