Steel Plant EAF Electrical System :: essays research papers

The advance(a) steel plant receives low current, high voltage index from the generators of the galvanising utility company. The purpose of the steel plant primary transformer is to step-down this voltage. The transformer then provides high current, low voltage power for the EAF furnace. Large furnaces with transformers rated at 100MVA or higher is not uncommon. There are unremarkably two stages to this process. The transformer premier(prenominal) steps-down the voltage from high to medium levels. There are different standards for a medium-level voltage in different countries usually between 30 to 33 kV for Europe and Japan, but for the USA it is usually 34.5 kV. Finally, a non-buoyant duty furnace transformer powers the EAF. This special furnace transformer is knowing to allow the electric arc to do work within the desired current and voltage range. To safeguard the EAF electrical organisation from the primary power supply are two types of switches a vacuity switch and a m otorized disconnect switch. These two switches are designed to isolate the EAF electrical system from the primary transformer in case of an emergency. otherwise electrical systems virtually the EAF are the delta closure, the power cables, the current conduction arm, and the electrode h one-time(a)s. The power cables provide a connection between the delta closure and the current conducting arm. It is usually do of copper wires, with a rubber water jacket around the outside for water-cooling the cables. The power cable is connected with the current conducting arm, usually made of copper clad steel or aluminum alloys. This system weighs a lot less than the old bus-bar design that a lot of the older furnaces used. The current conducting arm conducts current directly from the power cable to the electrode holders. The electrode holders must(prenominal) withstand thermal cycling (not so much for our furnace, since our furnace should have a continuous feed) and severe mechanical loading and wear due to vibrations, knottiness forces and such.