Multiple re-strikes phenomenon when using vacuum circuit breakers to start refiner motors

Eichenberg, Julia; Hennenfent, H.; Liljestrand, Lars

doi:10.1109/papcon.1998.685530

Cited by 15 publications

(5 citation statements)

References 2 publications

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“…4,5 Due to the above similarities, there is a risk that such issues arise in WPs as well. Indeed, high-frequency, high-voltage transients are suspected to have contributed to failures in offshore WPs.…”

Section: Introductionmentioning

confidence: 99%

“…The combination of vacuum circuit breaker (VCB), which is widely used in MV networks because of its outstanding breaking properties and low maintenance requirements, and cable networks has been recognized in industrial systems as a cause of problems with transient overvoltage (TOV) if care is not taken. 4,5 Due to the above similarities, there is a risk that such issues arise in WPs as well. Indeed, high-frequency, high-voltage transients are suspected to have contributed to failures in offshore WPs.…”

Section: Introductionmentioning

confidence: 99%

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Transients in collection grids of large offshore wind parks

2007

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transients in collection grids of large offshore wind parks

2007

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“…DOL-started motors are occasionally switched (interrupted) during startup (e.g., locked rotor condition, emergency stop, or process trip). It may result in overvoltages because of multiple reignitions and virtual current chopping, which may be significant depending on the system's reactances and capacitances [17], [18], resulting in insulation damage. The situation is more significant during startup because of the poor power factor.…”

Section: Motor Stator Winding Insulation Damage and Protectionmentioning

confidence: 99%

The soft starters

Endrejat

Pillay

2008

IEEE Ind. Appl. Mag.

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ARGE PUMPS AND COMPRESSORS IN THE MEGA-watt range are often required by the petrochemical industry. The associated motors are often large enough for soft starting or may also be so large to dictate the requirement of soft starting. Soft starting may also be required because of the nature of the process or the driven equipment. Direct online (DOL) starting results in the severe transients in the machine and associated power system, which can be avoided by soft starting. One or more large drives in a process plant can often benefit from the adjustable-speed operation for improved process control or energy savings. The reliability of the process is, however, extremely important because outages frequently result in major production or financial losses. Therefore, a reliable, flexible, safe, and cost-effective system is required.

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“…Considering all the topologies presented in figure 2, switching over-voltages or repetitive re-strikes in vacuum circuit breakers can be a problem for all of them, as long feeder cables in combination with short cables and transformers are involved. These phenomena are known from literature, [7], to occur in combination with vacuum circuit breaker operation. These phenomena are related with system parameters found in industrial plants as well as in off-shore collection grids, due to the extensive use of cables, regardless of the type of vacuum circuit breaker.…”

Section: Switching Overvoltagesmentioning

confidence: 99%

Collection grid topologies for off-shore wind parks

Frankén¹,

Dahlgren²,

Nielsen³

2005

18th International Conference and Exhibition on Electricity Distribution (CIRED 2005)

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Offshore wind parks are expected to be a growing market for the future wind power industry. Today, some offshore wind parks are erected, especially around the coast of Denmark, and future expansions will be seen in Denmark and in the rest of northern Europe as well as in other parts of the world. The existing wind parks are in sizes up to about 200 MW, covering areas up to 20-30 km 2. The sizes of the erected wind turbine generators, WTG are about 1-2 MW and the distances between the towers are from 600-700 m almost up to 1000 m. The collection grid of an offshore wind park interconnects all the WTG, into switchgear and step-up transformers on a platform if long distances from shore or, at short distances, in a land-based switchyard. The offshore platform is then connected to the main grid on shore by subsea transmission cables. As the wind parks cover large areas, it requires a quite lot of sub-sea cable to interconnect all the WTG in a wind park. The total sub-sea cable length of a collection grid of a size of 150 MW wind park is assumed to be as much as 50 km or maybe more. This paper discusses system grounding, switching overvoltages, and reliability of supply for a number of alternative configurations of offshore collection grids. TOPOLOGIES OF COLLECTION GRIDS The circumstances, given in the previous section, have influence on the electrical system. For the feeder cables in the collection grid, which connect a number of WTG to the centrally located platform, the longest feeders will be long, CIRED2005 Session No 5

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Multiple re-strikes phenomenon when using vacuum circuit breakers to start refiner motors

Cited by 15 publications

References 2 publications

Transients in collection grids of large offshore wind parks

Transients in collection grids of large offshore wind parks

The soft starters

Collection grid topologies for off-shore wind parks

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