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 …
Continue ReadingCurrent Transformer (CT) – Construction and Working Principle
The Motor Control Centre is used in general to describe combinations of enclosures, busbars, circuit breakers, power contactors, power fuses, protective relays, controls and indicating devices. Read more about switchgear …
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 …
Continue ReadingIntroduction to Gas Insulated Substations / Switchgears (GIS)
As per IEC 60947, switchgears with rated voltages up to 1000 V ac and 1500 V dc are termed as low voltage switchgear. The term ‘switchgear’ is a generic term …
A fuse protects an electrical circuit or device from excessive current when a metal element inside it melts to create an open circuit. In this post, we will look into the …
We have already given an introduction to substation earthing system in an article published earlier. Today we are going to discuss the design of substation earthing system. Before 1960s the …
What is a Static Relay? There are two basic classifications of relays – Electromechanical Relays and Solid State Relays (Static relay). One main difference between them is electromechanical relays have …
The ratio of output in kWh to the input in kWh of a transformer over a 24-hour period is known as all day efficiency. The ordinary or commercial efficiency of …
In oil circuit breakers, some insulating oil (e.g., transformer oil) is used as an arc quenching medium. Working Principle of Oil Circuit Breaker When the contacts of the oil circuit …
Continue ReadingOil Circuit Breakers – Types, Working and Construction