Neutral grounding, also known as neutral earthing, involves connecting the neutral point of the supply system, rotating machines, or transformers to the earth directly or through certain circuit elements. In …
What is VCB? VCB stands for Vacuum Circuit Breaker. In vacuum circuit breakers, the vacuum is used as the arc quenching medium. Vacuum offers the highest insulating strength. So it has …
An underground cable essentially consists of one or more conductors covered with suitable insulation and surrounded by a protecting cover. Although several types of underground cables are available, the type …
By parallel operation of single-phase transformers, we mean two or more transformers are connected to the same supply bus bars on the primary side and to a common bus bar/load on …
Armature reaction in alternator is the effect of armature flux on the field flux (i. e., rotor ampere-turns). Read this article to learn more. We have already discussed the effect …
The interesting thing about the parallel operation of the DC series generator is that DC series generators are not usually employed for the supply of power. Instead, DC series motors …
An electrical power transformer has to go through a number of transformer testing procedures for confirming its specifications and performances. In this article, you will learn different types of transformer …
Insulation Resistance or IR Test is carried out by maintenance engineers to ensure the healthiness of the overall insulation system of electrical equipment. It reflects the presence or absence of …
The effects of voltage and frequency variation on the transformer is discussed in this article. Usually, power transformers are not subjected to wide frequency variations. Also, modest voltage variations occur …
MCB or Miniature Circuit Breaker is an electromechanical device that protects an electric circuit from an overcurrent. The overcurrent in an electrical circuit may result from short circuit, overload or faulty design. This article explains different MCB …
In an SF6 Circuit breaker, sulphur hexafluoride gas is used as the arc quenching medium. The sulphur hexafluoride gas (SF6) is an electronegative gas and has a strong tendency to absorb …
The most appropriate type of substation depends on such factors as voltage level, load capacity, environmental considerations, site space limitations, and transmission line right of way requirements. The design criteria …
The rating of circuit breaker is given according to the duties that are performed by it. For complete specifications, standard rating and various tests of switches and circuit breakers IS …
A lightning arrester is connected to protect a piece of equipment from lightning and switching surges. Overvoltages may cause the burning of insulation of substation equipment if not well protected. …
Condition monitoring for transformers is the process of monitoring a parameter of conditions in transformer (moisture, temperature, etc.), in order to identify a significant change which is indicative of a …
Part 1Part 2Part 3Part 4Part 5 16. Out of the following circuit breakers, which one has the lowest voltage range ? (A) Air-break circuit breaker (B) Tank type oil …