Aug 10, 2012
Furnace switchgear achieves rated currents of 4 500 ABack
Berlin|Mannheim|Components|Design|Flow|Safety|Siemens|Switchgear|System|Systems|Testing|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
Updated 44 minutes ago The US Department of Defense’s technology arm Defense Advanced Research Projects Agency (Darpa) will start testing the use of high-performance fighter jets to deliver “cheaper, faster and easier” ways of launching small satellites into space. The Darpa-led Airborne...
Updated 57 minutes ago South Africa’s gross domestic product (GDP) growth has slowed from 4.1% in the last quarter of 2014 to 1.3% in the first quarter of this year, weighed down by a contracting manufacturing sector, Statistics South Africa (StatsSA) revealed in its quarterly GDP update...
Updated 59 minutes ago When the Eskom board suspended four executives in March, Public Enterprises Minister Lynne Brown based her support for the move largely on what she perceived as a lack of “credible information” flowing from the managers on a range of issues, including plant...
Recent Research Reports
Steel 2015: A review of South Africa's steel sector (PDF Report)
Creamer Media’s Steel 2015 report provides an overview of the key developments in the global steel industry and particularly of South Africa’s steel sector over the past year, including details of production and consumption, as well as the country's primary carbon...
Projects in Progress 2015 - First Edition (PDF Report)
In fact, this edition of Creamer Media’s Projects in Progress 2015 supplement tracks developments taking place under the Renewable Energy Independent Power Producer Procurement Programme, which has had four bidding rounds. It appears to remain a shining light on the...
Electricity 2015: A review of South Africa's electricity sector (PDF Report)
Creamer Media’s Electricity 2015 report provides an overview of State-owned power utility Eskom and independent power producers, as well as electricity planning, transmission, distribution and the theft thereof, besides other issues.
Construction 2015: A review of South Africa’s construction sector (PDF Report)
Creamer Media’s Construction 2015 Report examines South Africa’s construction industry over the past 12 months. The report provides insight into the business environment; the key participants in the sector; local construction demand; geographic diversification;...
Liquid Fuels 2014 - A review of South Africa's Liquid Fuels sector (PDF Report)
Creamer Media’s Liquid Fuels 2014 Report examines these issues, focusing on the business environment, oil and gas exploration, the country’s feedstock supplies, the development of South Africa’s biofuels industry, fuel pricing, competition in the sector, the...
Water 2014: A review of South Africa's water sector (PDF Report)
Creamer Media’s Water 2014 report considers the aforementioned issues, not only in the South African context, but also in the African and global context, and examines the issues of water and sanitation, water quality and the demand for water, among others.
This Week's Magazine
While economic forecasts for the African continent are most favourable, African airlines may not be able to benefit from the expected growth in the region’s gross domestic product (GDP), International Air Transport Association VP: Africa Raphael Kuuchi has warned....
The Automotive Production and Development Programme (APDP) will need to change substantially post 2020, says Metair Investments South African operations COO Ken Lello. “We must not make tweaks. We have to change. What we are doing is not sustainable.”
Banking group Absa’s forecast is for the rand to end the year at around R13 against the dollar, weakening further to R13.50 by 2016, says Absa sectoral analyst Jacques du Toit. He warns that possible interest rate hikes in the US may see capital being pulled from...
The Dispute Resolution Centre at the Bargaining Council for the Civil Engineering Industry (BCCEI) is now open to handle party-to-party disputes. The BCCEI represents the interests of all level four to nine Construction Industry Development Board companies.
Communications technology firm Ericsson sub-Saharan Africa head Fredrik Jejdling says the company’s commitment to sustainability and corporate responsibility has been integrated into all facets of its operations, which has provided it with sustainable revenue...
Next ArticleGerman company develops new electric arc furnace