The ABB order booked in quarter four 2016 comprises five DCBs rated at 145kV, 3150A nominal current and a fault level of 40kA. An earth switch for each circuit breaker was included. ABB will supply the units from Sweden to a tight delivery schedule and the cold commissioning will be done by ABB's local engineering team.
The DCBs, required to bypass the current limiting reactors to start large motors, will help to address the challenge of space at the Oxygen Train 17 project substation. The ABB units are compact because they provide the functionality of a circuit breaker and a disconnector combined in a single unit. Without the need for separate disconnectors, up to 50 to 75 percent less space is required. Unplanned outages are reduced by up to 70 percent according Cigré report on high-voltage circuit breakers reliability, (group A3.06 October 2012), which means a low life-cycle. During construction, there is less civil work.
The environmental impact of the ABB DCBs is substantially lower - an ABB study shows that energy savings over 40 years’ service corresponds to a CO2 savings equivalent to removing five cars from the road. Maintenance intervals are significantly reduced to 15 years, depending on environmental pollution - natural and industrial - and reliability is increased because of the evolution of primary breaking technology from ABB.
Confidence Mabulwana, Regional Market Manager for High Voltage Products, ABB South Africa, says, "We are proud to provide Fluor with a compact solution for Sasol that delivers higher substation availability and lower environmental impact."
The ABB DCB solution provides outage reduction in both maintenance and failure compared to conventional solutions, says Hennie Wagenaar, Sales Manager: Industry, Electrification Products, ABB South Africa. "Our DCBs give a higher reliability of the disconnecting function since the primary contacts are gas enclosed and protected from pollution. Maintenance intervals are longer giving an overall increase of availability for substations."
ABB's also cater for industrial automation via a PIU (Process Interface Unit) that makes breakers ready for future substation automation, allowing the DCBs to be connected to the substation automation and control system.
ABB (ABBN: SIX Swiss Ex) is a pioneering technology leader in electrification products, robotics and motion, industrial automation and power grids, serving customers in utilities, industry and transport & infrastructure globally. Continuing more than a 125-year history of innovation, ABB today is writing the future of industrial digitalization and driving the Energy and Fourth Industrial Revolutions. ABB operates in more than 100 countries with about 132,000 employees. (www.abb.com)