Aug 10, 2012
Furnace switchgear achieves rated currents of 4 500 ABack
Berlin|Mannheim|Components|Flow|Safety|Siemens|Switchgear|System|Systems|Germany|Turkey|United States|Electronics|Flow|Furnace Switchgear Systems|Maintenance|Products|Services|Steel|Systems|Environmental|Power
© Reuse this
Electronics company Siemens reports that its Simetal Sivac-X 4K furnace switchgear has reliably switched a rated current of more than 4 500 A with a single circuit breaker during a successful type test according to IEC 62271.
Global testing services provider, the CESI group, performed the type test in Mannheim and Berlin, in Germany.
“This is significantly more than conven- tional furnace switchgears achieve. “The switchgear has a rated voltage of 40.5 kV and can supply electric arc furnaces (EAFs) with up to 300 MVA of power,” the company states.
The lightning impulse voltage is 200 kV, which makes the switchgear suitable for the North American market.
The switchgear has achieved the fault arc qualification of Internal Arc Classified A FLR of 40 kA/1s and also meets the highest demands for personnel safety.
The core component is the 3AH4 medium-voltage circuit breaker.
The Simetal Sivac-X 4K switchgear is designed to meet the extreme requirements of high-power EAFs and ensures a reliable power supply, as well as safe plant operation. Long maintenance intervals of up to 10 000 switching cycles increase availability and reduce operating costs.
The 3AH4 range of frequency circuit breakers are designed for use under extreme environmental conditions. These include high temperatures, high air pollution, unstable operating currents, frequent short-circuit releases and operating cycles with more than 100 switching cycles a day.
For this reason, the circuit breakers have a rugged, insulated support design and are equipped with freely accessible vacuum interrupters. This enables the interrupters to be replaced easily at the end of their life span of about 30 000 switching cycles.
The circuit breaker is specifically designed so that air can flow freely along the heat sinks. This enables the switching device to operate at up to 4 500 A in ambient temperatures of up to 40 °C without forced cooling.
The drive for the 3AH4 circuit breaker range is designed for up to 120 000 switching cycles over its entire life cycle.
About 400 furnace switchgear systems of the Simetal Sivac-X range are in use worldwide. Siemens offers switchgear for operating voltages ranging from 15 kV to 40.5 kV and rated currents from 1 250 A to meet the specific requirements of 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 range of products also includes the customised protection circuit, which is essential for the operational safety of the vacuum circuit breakers and connected components.
The arcing-fault tested design, the metal encapsulation, interlocks, the capacitive voltage testing system and the IP4X degree of protection ensure maximum safety for personnel.
The first 3AH4 furnace circuit breakers, with rated currents of 3 150 A and 4 000 A respectively, are in use in steelworks in Germany and Turkey. The first US-bound 4 000 A switchgear is currently being delivered.
Edited by: Chanel de Bruyn© Reuse this Comment Guidelines (150 word limit)
Other Foundries, Forges and Die-Casting News
Recent Research Reports
Defence 2014: A review of South Africa's defence industry (PDF Report)
Creamer Media’s Defence 2014 report examines South Africa’s defence industry, with particular focus on the key participants in the sector, the innovations that have come out of the sector, local and export demand, South Africa’s controversial multibillion-rand...
Road and Rail 2014: A review of South Africa's road and rail infrastructure (PDF report)
Creamer Media’s Road and Rail 2014 report examines South Africa’s road and rail transport system, with particular focus on the size and state of the country’s road and rail network, the funding and maintenance of these respective networks, and the push to move road...
Real Economy Year Book 2014 (PDF Report)
This edition drills down into the performance and outlook for a variety of sectors, including automotive, construction, electricity, transport, steel, water, coal, gold, iron-ore and platinum.
Real Economy Insight: Automotive 2014 (PDF Report)
This four-page brief covers key developments in the automotive industry over the past 12 months, including an overview of South Africa’s automotive market, trade figures, production and the policies influencing the sector.
Real Economy Insight: Construction 2014 (PDF Report)
This five-page brief covers key developments in the construction industry over the past 12 months. It provides an overview of the sector and includes details of employment in the sector, infrastructure and municipal spending, as well as insight into companies’...
Real Economy Insight: Electricity 2014 (PDF Report)
This five-page brief covers key developments in the electricity industry over the past 12 months, including details of State-owned power utility Eskom’s generation activities, funding and tariffs, independent power producers and prospects for the sector.
This Week's Magazine
Integrated energy and chemical company Sasol has partnered with Unisa Graduate School of Business Leadership (SBL) professor and founder and CEO of PanAvest Partnership Dr Douglas Boateng to publish a series of books on executive supply chain management aimed at...
The World Wide Fund for Nature’s (WWF’s) 2014 Living Planet Index (LPI) indicates that there has been a 52% decline in vertebrate species since 1970. The Index tracked the trends of 10 000 discrete populations of over 3000 vertebrate species between 1970 and 2010.
Rwanda has joined a number of East African countries seeking to import electricity from Ethiopia as its demand grows. After it became apparent several generation project it is implementing will not come on stream early enough, now plans to import 400 MW from Ethiopia...
Metrorail’s first new passenger train will arrive in November next year, says Passenger Rail Agency of South Africa (PRASA) CEO Lucky Montana. “Next year we will be able to put our hands around the infrastructure and equipment we have been talking about for so long.”
The Competition Commission has launched an investigation into what it says are “price fixing, market division and collusive tendering in the market for the manufacture and supply of automotive components to original equipment manufacturers” (OEMs, or vehicle...
Next ArticleGerman company develops new electric arc furnace