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 free electrons. The contacts of the breaker are opened in a …
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 of the substation can vary among the system. With the …
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 375/1951 may be consulted. A circuit breaker is required to …
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. Lightning is one of the most serious causes of overvoltages. …
Transformer Oil Filtration Plant is a self-contained unit to upgrade the quantity of oil. The duty cycle begins from pumping the dirty oil from the equipment (or container) to a heat chamber. After heating the oil to a predetermined …
What is Transformer Oil? Transformer oil is mineral insulating oil derived from crude petroleum. It is a mixture of various hydrocarbons. It consists partly aliphatic compounds (open chain compounds) with the general formula CnH2n+2 and CnH2n. Many oils also contain certain …
Air blast circuit breaker employs a high-pressure air blast as an arc quenching medium. The construction and working of different types of air blast circuit breakers are explained in this article. This type of circuit breaker has been used earlier …
The operating principle and arc forming phenomenon were explained in the previous article. Now it is very important to extinct the arc to avoid the serious dangers. As long as this arc is sustained in between the contacts the …
The substation earthing system comprises of a grid (earth mat) formed by a horizontal buried conductors. Read about design of substation earthing system here. The grounding system in substation is very important. The functions of grounding systems or earth mat in …