SSAB is a highly-specialized global steel company that develops performance steel and provides services for better performance and sustainability. The company is a leading producer of advanced high-strength steels; quenched and tempered steels; strip, plate and tubular products; as well as construction solutions. The company has production plants in Sweden, Finland and the United States, and has an annual steel production capacity of 8.8 million tons.
SSAB has a facility in Borlange, Sweden that features a finishing mill that carries out the final step in the production of steel coils. The finishing mill motors were installed and put into production in 1981/1982 but were, for years, plagued by arc flashes that resulted in damage of varying degrees of severity.
An arc flash is the heat and light produced by an arc caused by a fault in electrical equipment. An arc flash is an extremely serious and dramatic event and is one of the most serious incidents that can occur in an electrical installation. Arc-flash temperatures can reach 20,000 C and the energy and shrapnel produced in the blast can cause injury and serious damage.
Normal short-circuit measures are too slow to protect against arcing events like this.
The ABB solution
Much work has been carried out over the years to mitigate the effects of arc flash. ABB has had an effective arc flash countermeasure product, Arc Guard TVOC, on the market for several decades.