ABB Ltd

About: ABB Ltd is a company organization based out in Zurich, Switzerland. It is known for research contribution in the topics: Voltage & Signal. The organization has 6222 authors who have published 6852 publications receiving 83994 citations.

A universal algorithm for homophonic coding

Abstract: This contribution describes a coding technique which transforms a stream of message symbols with an arbitrary frequency distribution into a uniquely decodable stream of symbols which all have the same fiequency.

Airblast atomizer nozzle

Abstract: In an airblast atomizer nozzle (2) for the operation of a burner (1) operated with liquid and gaseous fuels (4, 6) the intermediate wall (18) between the inner (14) and outer (13) air duct is held via inner and outer support elements (21) which have a sliding fit (28) and which can be designed as swirl vanes. The atomizer edges (19) of the airblast nozzle (2) are angled in the direction of the nozzle axis (11). The nozzle is distinguished by small dimensions, a low pressure loss and a negligible tendency to coking.

Experiences gamifying developer adoption of practices and tools

Abstract: As software development practices evolve, toolsmiths face the continuous challenge of getting developers to adopt new practices and tools. We tested an idea with industrial software developers that adding game-like feedback to the development environment would improve adoption of tools and practices for code navigation. We present results from a pre-study survey of 130 developers' opinions on gamification and motivation, usage data from a study with an intact team of six developers of a game on code navigation practices, and feedback collected in post-study interviews. Our pre-study survey showed that most developers were interested in gamification, though some have strong negative opinions. Study results show that two of the six study developers adjusted their practices when presented with competitive game elements.

Converter-fed synchronous machine for pumped hydro storage plants

Abstract: Pumped hydropower is gaining importance as a key technology for the integration of large quantities of renewable electricity, in particular from wind and solar sources. With the progress in power electronics, it has recently become possible to build frequency converters with a rated power in excess of 100 MVA, paving the way for a new variable speed pumped hydropower solution based on synchronous machines whose stator is driven with a variable frequency. This solution, refered to as converter fed synchronous machine (CFSM), is offering even higher flexibility and efficiency than DFIM (doubly-fed induction machine). A first CFSM plant with a rated power of 100 MVA has been installed in Switzerland and has been in productive operation since late spring 2013. As a further step a new CFSM power converter type based on modular multi-level converter (MMC) technology is proposed. This topology, powered by advanced IGCT (integrated gate-commutated thyristor) power semiconductor devices, enables a total power conversion efficiency greater than 98.5%. Very smooth waveforms and special starting algorithms make it possible to use standard generator and transformer insulation schemes. Due to a modular converter construction, the accessible range of rated power spans from approximately 50 MVA up to 500 MVA. Built-in redundancy enables a very high availability.