Application considerations for class-1 div-2 inverter-fed motors

Paes, Richard; Lockley, Bill; Driscoll, T.; Melfi, M.J.; Rowe, V.; Rizzo, S.

doi:10.1109/tia.2005.861378

Cited by 7 publications

(2 citation statements)

References 20 publications

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“…The PI/Al 2 O 3 nanocomposite samples and electrodes are cleaned with anhydrous alcohol, then desiccated in the vacuum oven at 120 °C for 2 hours before corona-aging tests to avoid the influence of water absorption on the dielectric behavior of PI 25 . The running temperature of inverter-fed motor polyimide insulation reaches 140 °C 26 or higher during the practical operation and the polyimide films in many power electronic devices including insulated gate bipolar translator (IGBT) have to sustain the operating temperature of 150 °C 27 . Thus the experiments are carried out on 0 wt%, 2 wt% and 5 wt% PI/Al 2 O 3 nanocomposites films at 80 °C, 120 °C and 160 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

“Thermal Stabilization Effect” of Al2O3 nano-dopants improves the high-temperature dielectric performance of polyimide

Yang

et al. 2015

Sci Rep

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Insulation performance of the dielectrics under extreme conditions always attracts widespread attention in electrical and electronic field. How to improve the high-temperature dielectric properties of insulation materials is one of the key issues in insulation system design of electrical devices. This paper studies the temperature-dependent corona resistance of polyimide (PI)/Al2O3 nanocomposite films under high-frequency square-wave pulse conditions. Extended corona resistant lifetime under high-temperature conditions is experimentally observed in the 2 wt% nanocomposite samples. The “thermal stabilization effect” is proposed to explain this phenomenon which attributes to a new kind of trap band caused by nanoparticles. This effect brings about superior space charge characteristics and corona resistance under high temperature with certain nano-doping concentration. The proposed theory is experimentally demonstrated by space charge analysis and thermally stimulated current (TSC) tests. This discovered effect is of profound significance on improving high-temperature dielectric properties of nanocomposites towards various applications.

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Section: Resultsmentioning

confidence: 99%

“Thermal Stabilization Effect” of Al2O3 nano-dopants improves the high-temperature dielectric performance of polyimide

Yang

et al. 2015

Sci Rep

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“…This may remove the requirement of a purging or prestart system. New reduced certification requirements may be applicable for certain MV technologies because of more sinusoidal output waveforms [15]. Some important factors that must still be evaluated are given in [12], [15], and [16].…”

Section: Hazardous Area Considerationsmentioning

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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Experience with new large adjustable speed drive technology for multiple synchronous motors

Endrejat

Blerk

Vignolo

2008

2008 5th Petroleum and Chemical Industry Conference Europe - Electrical and Instrumentation Applications

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New Voltage Source Inverter technology now exists with high output voltage (≥11kV) suitable for high power synchronous motor applications. The technology with an advanced control system can be used as a multiple motor soft starter and adjustable speed drive for selected motors with significant benefits. Design, commissioning and operation experience is described for a first of its kind installation with three synchronous motors rated 11kV 17MW. The overall control and communication system is described with specific attention to safety, redundancy and process availability. New synchronization and desynchronization scheme experience is described. Unique synchronous motor protection and excitation control schemes for both adjustable speed and line operation are outlined. Site recordings prove system ride-through capability in terms of voltage dips and bypass of internal power cells. Conclusions are given which support new voltage source technology as a viable alternative to conventional load commutated inverter technology for certain large synchronous motor applications. Suggestions are made for additions to present medium voltage adjustable speed drive standards.Index Terms -adjustable speed drive, synchronous motors, voltage source inverter, medium voltage, load commutated inverter

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Application considerations for class-1 div-2 inverter-fed motors

Cited by 7 publications

References 20 publications

“Thermal Stabilization Effect” of Al2O3 nano-dopants improves the high-temperature dielectric performance of polyimide

“Thermal Stabilization Effect” of Al2O3 nano-dopants improves the high-temperature dielectric performance of polyimide

The soft starters

Experience with new large adjustable speed drive technology for multiple synchronous motors

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