Aug 10, 2012
Furnace switchgear achieves rated currents of 4 500 ABack
Berlin|Mannheim|Flow|Siemens|Switchgear|Germany|Turkey|United States|Electronics|Flow|Furnace Switchgear Systems|Steel
© 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
Other Furnaces, Kiln, Ovens and Dryers News
A new modular oven and operator panel with a colour display is being offered by global technology group Siemens’ Industry Automation Division for its Maxum Edition II gas chromatograph, used to separate and analyse gas by chromatography.
British technology company Dyson says its patented Airblade hand dryer is the first hand dryer to earn the Carbon Reduction Label from nonprofit organisation Carbon Trust.
Recent Research Reports
Steel 2014: A review of South Africa's steel sector (PDF Report)
Creamer Media’s Steel 2014 report provides an overview of 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 steel and stainless...
Projects in Progress 2014 - First Edition (PDF Report)
This publication contains insight into progress at the delayed Medupi and Kusile coal-fired projects, in Mpumalanga and Limpopo respectively, as well as at the Ingula pumped-storage scheme, which is under construction on the border between the Free State and...
Automotive 2014: A review of South Africa's automotive sector (PDF Report)
The report provides insight into the business environment, the key participants in the sector, local construction demand, geographic diversification, competition within the sector, corporate activity, skills, safety, environmental considerations and the challenges...
Construction 2014: A review of South Africa's construction sector (PDF Report)
Construction data released during 2013 hints at a halt to the decline in the industry during the last few years, with some commentators averring that the industry could be poised for recovery. However, others have urged caution, noting that the prospects for a...
Electricity 2014: A Review of South Africa's Electricity Sector (PDF Report)
This report provides an overview of the state of electricity generation and transmission in South Africa and examines electricity planning, investment in generation capacity, electricity tariffs, the role of independent power producers and demand-focused initiatives,...
Defence 2013: A review of South Africa's defence industry (PDF Report)
Creamer Media’s 2013 Defence Report examines South Africa’s defence industry, with particular focus on the key players in the sector, the innovations that have come out of the defence sector, local and export demand, South Africa’s controversial...
This Week's Magazine
Updated 14 minutes ago The Electronic Systems Laboratory (ESL) of the Department of Electrical and Electronic Engineering at Stellenbosch University is strongly reaffirming its position as one of South Africa’s leading centres for satellite technology and expertise. It is currently...
Updated 14 minutes ago The world’s lowest-cost diesel-electric locomotive is not made in China, but in Pretoria, at RRL Grindrod Locomotives’ newly upgraded 30 000 m2 plant. The company’s locomotive pricing is “more competitive than any other original-equipment manufacturer (OEM)...
Updated 14 minutes ago The South African Defence Review 2012, released to the public at the end of last month (despite the year given in its title) recommends the creation of the post of Chief Defence Scientist. This official would be responsible for the management of defence technology...
Updated 14 minutes ago AltX-listed engineering technology company Ansys has been awarded an R188-million contract by Transnet to supply integrated dashboard display systems to the freight rail utility’s locomotives. Black-owned and controlled Ansys developed the bespoke integrated system...
Updated 14 minutes ago South Africa’s sole nuclear power station Koeberg, which is located in the Western Cape, breached a major operations milestone on April 4, which marked the thirtieth anniversary of Unit 1 having been connected to the grid. Eskom, which operates the two-unit plant,...