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Every facility, regardless of size, has process loads which are considered critical. However, what does the term “critical” mean? A process engineer's ideas of a critical load may differ from those of an electrical engineer, an HSE engineer, or plant engineer. This paper defines critical loads and discusses a methodology to evaluate if a load should be considered critical. The methodology considers...
There is a need for reliable, efficient and safe high power electrical systems in the petrochemical industry e.g. for air separation/oxygen plants. Such air separation plants use large synchronous motors. These motors cannot be started directly on line and a specialized redundant, cost effective, static frequency converter start system is proposed for a number of such trains. Redundancy is built in...
Medium voltage (MV) synchronous machines (SMs) are expected to ride through adjustable speed drive (ASD) faults, excitation faults, system faults/disturbances and supply transfers. Models suitable for direct-on-line and ASD ride-through simulations are discussed. Case studies, simulation and test results are presented for an 11 kV ASD for 17 MW SMs and for a 55 MW SM. It is shown that line fed and...
An overview is given of conventional and modern large adjustable speed drive technologies (MW range). Overall efficiency is evaluated for different adjustable speed drive topologies, motor types, control methods and system configurations. Efficiency improvement opportunities are investigated. It is shown how modern technology can be applied safely with existing/standard petrochemical motors (identified...
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