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Before explaining inductance, let us recall what an inductor is. An inductor is a passive device that opposes sudden change in current through it by inducing an emf across it. Actually, an inductor is a coil of conducting wire. When current flows through an inductor, it produces a magnetic flux around it. Hence, this flux … Read more
In our previous article, we discussed how an inductor behaves in a DC circuit. In this article, we shall discuss how an inductor behaves in an AC circuit. Suppose there is an inductor. We have connected this inductor across an alternating electrical source. The alternating source generates a pure sinusoidal signal. Now, we shall consider … Read more
An inductor is any type of coil of a conductive wire. We all know from our childhood that when a current flows through a coil, it becomes a magnet. It means that whenever a current flows through the coil, it produces a magnetic flux surrounding it. Obviously, if we change the amplitude of the current, … Read more
Power systems deliver electricity from generation stations to consumer ends. Nowadays, power system networks become very complex. This increased complexity disrupts the voltage and frequency. Hence, the system needs to maintain voltage and frequency to ensure reliable and efficient power flow. For example, changes in load, major faults, switching operations, and renewable energy integration can … Read more
Breakdown Voltage (BDV) of Transformer Oil Breakdown Voltage (BDV) indicates the voltage above which an oil electrically breaks down. According to IS 335, new unfiltered transformer oil should have a breakdown voltage above 30 kV (rms) when tested with a 2.5 mm gap. For filtered new transformer oil, it is greater than 60 kV (rms) … Read more
Transformer oil plays two major roles inside a transformer. It strengthens the electrical insulation between live parts and between live and dead parts inside the transformer tank. It also removes heat from the core and windings by carrying the heat to the radiators. To perform efficiently, transformer oil must possess several important properties. Each of … Read more
Transformer oil is a special type of refined petroleum oil. It provides both insulation and cooling to electrical equipment. Additionally, we utilize insulating oil in power transformers and distribution transformers. We fill the gaps between the core, windings, and interior of the transformer tank with this oil. The presence of oil in the gaps enhances … Read more
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
An autotransformer utilizes a single continuous winding. On the other hand, a two-winding transformer consists of two separate windings, one for the primary and the other for the secondary. In an autotransformer, the secondary is tapped from a specific turn of its winding. It saves some copper. Obviously, copper means money. So this optimizes the … 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