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Siemens Furnace Switchgear Achieves Rated Currents of 4,500 Amperes
05/11/2012 - The Simetal Sivac-X 4K furnace switchgear from Siemens has reliably switched a rated current of more than 4,500 amperes with a single circuit breaker in the test laboratory during the course of a successful type test according to IEC 62271. The switchgear has a rated voltage of 40.5 kilovolts, and can supply EAFs with power up to 300 MVA.
The Simetal Sivac-X 4K furnace switchgear from Siemens has reliably switched a rated current of more than 4,500 amperes with a single circuit breaker in the test laboratory during the course of a successful type test according to IEC 62271.
The switchgear has a rated voltage of 40.5 kilovolts, and can supply electric arc furnaces with power up to 300 MVA. The lightning impulse voltage is 200 kilovolts, making the switchgear suitable for the North American market. The switchgear has achieved the fault arc qualification of IAC A FLR of 40 kA/1 s. The core component is the 3AH4 medium-voltage circuit breaker, which has a life cycle of up to 120,000 switching cycles. The type test according to IEC 62271-200 was performed by the CESI group in Mannheim and Berlin.
The Simetal Sivac-X 4K switchgear has maintenance intervals of up to 10,000 switching cycles to increase availability and reduce operating costs. The circuit breaker is designed so that air can flow freely along the heat sinks, enabling the switching device to operate at up to 4,500 amperes in an ambient temperature of up to +40°C without forced cooling.
Siemens offers switchgear for operating voltages ranging from 15 to 40.5 kilovolts and rated currents from 1,250 amperes to meet the specific requirements of electric steelmakers. According to the specific circumstances in the electric steel plant, the switchgear can be designed as an open unit with a permanently installed furnace circuit breaker, as a two-field system in a metal enclosure with a permanently installed circuit breaker, or as a single-field solution in a metal enclosure with a withdrawable furnace circuit breaker mounted on a traveling carriage.
The first 3AH4 furnace circuit breakers, with rated currents of 3,150 and 4,000 amperes, respectively, are in use in steelworks in Germany and Turkey. The first 4,000-ampere switchgear is currently being delivered in the U.S.
The Siemens Industry Sector (Erlangen, Germany) is a leading supplier of innovative and environmentally friendly products and solutions for industrial customers. With end-to-end automation technology and industrial software, solid vertical-market expertise, and technology-based services, the Sector comprises the divisions Industry Automation, Drive Technologies, and Customer Services, as well as the Business Unit Metals Technologies.
The Metals Technologies Business Unit (Linz, Austria), part of the Siemens Industry Sector, is one of the world’s leading life-cycle partners for the metallurgical industry. The business unit offers a comprehensive technology, modernization, product and service portfolio as well as integrated automation and environmental solutions covering the entire life cycle of plants.
