The assembly of the apparatus used to change some characteristic (e.g. voltage, a.c. to d.c., frequency, p.f etc.) of electric supply is called a sub-station. The four major types of substations are explained in this article. Sub-stations are an important part of the power system. The continuity of supply depends to a considerable extent upon the successful operation of … [Read more...] about 4 Major Types of Electrical Substations
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 current in its primary. Current transformers, along with voltage or potential transformers are Instrument transformer. Current transformers are designed to provide a scaled-down replica of the current … [Read more...] about Current Transformer (CT) – Construction and Working Principle
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 oil are explained in this article. Organic oils of vegetative or animal origin are good insulators but tend to decompose giving rise to acidic by-products … [Read more...] about Properties of Good Transformer Oil
It is fair to say that without discriminative protection it would be impossible to operate a modern power system. The protection is needed to remove as speedily as possible any element of the power system in which a fault has developed. So long as the fault remains connected, the whole system may be in danger from three main effects of the fault, namely: it … [Read more...] about Why we need Power System Protection?
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 introduction to Gas insulated Substations.Gas Insulated Substation (GIS) also called SF6 Gas Insulated Metalclad Switchgear is preferred for 12kV, 36kV, 72.5kV, 145 kV, 245 kV, 420 … [Read more...] about Introduction to Gas Insulated Substations / Switchgears (GIS)