A current limiting reactor, also known as a series reactor, is an inductive coil with a large inductive reactance compared to its resistance. It is used to limit short-circuit currents …
Percentage reactance of power system elements such as generator, transformer and reactor are extensively used in short circuit calculation when any fault occurs in the system. Most faults in the …
Transformer windings are one of the most important parts of a transformer. There are different types of transformer windings available on the market. The selection of transformer windings is based …
Three-phase transformers are used in three-phase circuits to step up and step down the voltage according to the needs in a power system. You know that electric power is generated …
Open Delta Connection is a method of transformer connection used to transform three-phase power using two single-phase transformers. In this article, you will learn how this connection is done and …
This article covers transformer impedance testing, one of the acceptances tests for new transformers, and a method for routine testing. The results of this test should compare directly to the …
An electrical substation is an integral part of a generation, transmission and distribution system. A substation can interrupt or establish electrical circuit, change the voltage, frequency or other characteristics of …
Transformer bushing types are categorized based on their material, manufacturing, and design mainly into the following types: OIP (Oil-Impregnated Paper) Bushing RIP (Resin Impregnated Paper) Bushing RIS (Resin Impregnated Synthetic) …
A current transformer (CT) is a type of transformer that is used to measure AC current. It produces an alternating current (AC) in its secondary which is proportional to the AC …
Please read Ideal Transformer and Practical Transformer before continuing. Consider a practical transformer on no load i.e., secondary on open-circuit as shown in figure below. The primary will draw a small …
Amazed why secondary of current transformer should not be open? If it is left open it may destroy the current transformer. So it is very important that the secondary of …
Ideal Transformer An ideal transformer is one that has no winding resistance no leakage flux i.e., the same flux links both the windings no iron losses (i.e., eddy current and …
Even though the basic functions of the oil used in transformers are heat conduction and electrical insulation, there are many other properties which make a particular oil eminently suitable. Properties of good transformer …
The percentage impedance of a transformer is marked on most nameplates – but what is it and what does the Z% figure mean? The impedance of a transformer is the total opposition …
An induction motor may be considered to be a transformer with a rotating short-circuited secondary. The stator winding corresponds to the transformer primary and the rotor winding to the transformer …
Gas-insulated substations (GIS) have been used in power systems over the last three decades because of their high reliability, easy maintenance, small ground space requirement, etc. This article is an …
