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 …
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 …
Primary and Back-up Protection Primary protection (Main protection) is the essential protection provided for protecting an equivalent/machine or a part of the power system. As a precautionary measure, addition protection …
1. What is a Circuit Breaker? Circuit Breaker is a mechanical device designed to close or open contact members, thus closing or opening an electrical circuit under the normal or …
