Power Transformer

A three-phase autotransformer has a star winding on both the primary and secondary sides. Suppose an imbalance arises in the three-phase current. It may happen on either the primary or the secondary side. In both cases, it produces zero-sequence current through the winding. For example, suppose an earth fault occurs in any one of the … Read more

Cause of Voltage Regulation Every electrical source has some internal or inherent impedance. It may be a battery, a transmission line, a power transformer, or any other device that can supply electric power. Due to this inherent impedance, there is always a voltage drop in that system. When we measure the voltage across the open … Read more

Two types of losses occur in a transformer. We refer to these losses collectively as losses in Transformers. These two losses are no-load losses and copper losses. We also often refer to the no-load losses as core losses. These losses occur due to the magnetic material of the core of the transformer. These losses include … Read more

The power that enters through the primary of a power transformer does not remain the same at the output circuit. In simple words, a transformer cannot transfer the entire input power to the load. A transformer is an electrical machine. So, it has its own efficiency level. No machine in the universe can have 100% … Read more

Not only a power transformer, but all transformers have only two main parts. These are the windings and the core. All other parts associated with the transformer are just there to support the working of the transformer. Actually, the principle of a transformer is based on these two elements — the winding and the transformer … Read more

Traditional distribution transformers use cold-rolled grain-oriented (CRGO) silicon steel for their core. However, in recent years, manufacturers have preferred using amorphous iron materials. The amorphous core material is typically an amorphous iron alloy. It is mainly an iron alloy, with a small quantity of boron and silicon. Unlike CRGO steel, the amorphous material is non-crystalline … Read more

In this article, we are going to discuss the theory behind a condenser bushing. We have mainly focused on how the capacitor grading improves the voltage distribution along the thickness of the insulation. We also call it a capacitor graded bushing. There are mainly two types of condenser bushings. These are the OIP bushing and … Read more

We also refer to a resin-bonded paper bushing or a synthetic resin-bonded paper bushing, respectively, as SRBP or RBP bushings, in short form. Before entering the actual discussion of resin-bonded paper bushings, let us understand the meaning of resin-bonded paper. What is the meaning of resin-bonded? We all know that paper is a cellulose material, … Read more

An OIP bushing uses concentric cylindrical capacitors in series between the central conductor and outer insulator housing of the bushing. An OIP bushing serves the same purpose as the other types of bushings do. That means it provides proper insulation between the live conductor and the grounded metallic tank of electrical equipment, such as power … Read more

RIP bushing is a kind of condenser bushing or capacitor-graded bushing. The full form of RIP bushing is Resin Impregnated Paper Bushing. The working principle of an RIP bushing is similar to that of an OIP bushing, and construction-wise, they are almost similar. The only difference is that in an OIP bushing, we use oil … Read more