Accelerated life testing of high voltage stator coils with enhanced PET-mica insulation system

Haq, Saeed Ul; Omranipour, R.

doi:10.1109/eic.2011.5996202

Cited by 10 publications

(4 citation statements)

References 3 publications

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“…In 2011, GE developed enhanced polyethylene glycol terephthalate (PET)-mica tape through using PET films as backing material for mica paper, processed in an optimised vacuum pressure impregnation (VPI) treatment [26]. PET is a linear, thermoplastic polymer which exhibits a high melting point (265°C) and excellent stability.…”

Section: Novel Insulation Materials and Systemsmentioning

confidence: 99%

“…The reductions in ground wall thickness over the past decade have been made possible due to One way to increase the amount of mica in the ground wall other than the use of flat glass is to replace the glass cloth backings in mica paper tapes with thermoplastic films with a one-quarter thickness of the glass cloth (down to about 0.0065 mm). In this regard, PET films have been widely used [26]. Newer polyester films made by polyethylene naphthalate having better thermal stability are replacing PET films.…”

Section: Novel Insulation Materials and Systemsmentioning

confidence: 99%

“…VE life curve for the enhanced PET-mica system compared to other systems[26] Temperature tests at rated stator current[28] Glass filaments in the standard method and Powerfab's method[29] Thickness of the standard tape and Powerfab's tape[29] …”

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confidence: 99%

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High power density technologies for large generators and motors for marine applications with focus on electrical insulation challenges

Ghassemi

2020

High Voltage

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High power density generators and motors are envisaged in modern all-electric ships where electrical power for both propulsion and service loads is provided through a common electrical platform known as an integrated power system. Three recent high-power density technologies for generators and motors proposed for marine applications are reviewed, and the author focuses on their electrical insulation challenges. These technologies are high-frequency (high-speed) generators (200-400 Hz), superconducting generators, and novel insulation materials and systems. For high-speed generators, high loss in magnetic materials may shorten its insulation life. Thus, these generators should be designed to be cooled by water instead of air. For superconducting generators, the most significant concern is the integrity of the insulation system over the large thermal excursion whenever the system is cycled between room temperature and operating temperature. In novel insulation materials and systems section: (i) using mica paper tapes containing boron nitride filler in the binding resin of the glass backing insulation, developed by Toshiba and Von Roll, resulted in a 15% increase in the MVA of generators for the same slot dimensions and operating temperatures, (ii) GE developed an enhanced polyethylene glycol terephthalate-mica tape having superior voltageendurance characteristics, (iii) Isovolta has introduced a mica paper tape using a flat glass fibre backing material, called Powerfab, rather than the more common woven structure, leading to a 15% reduced mica tape, and (iv) adding novel nanocomposites as fillers to ground wall insulation, introduced by Siemens, is a promising technique towards more high power density designs. Furthermore, accelerated aging of insulation systems especially those in electrical rotating machines exposed to voltage pluses with high slew rates up to hundreds of kV/μs and high-repetition rates ranging from hundreds of kHz to MHz is discussed. These voltage pulses are generated by wide bandgap-based converters envisaged in the medium voltage DC architecture for future U.S. naval ships.

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Section: Novel Insulation Materials and Systemsmentioning

confidence: 99%

Section: Novel Insulation Materials and Systemsmentioning

confidence: 99%

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High power density technologies for large generators and motors for marine applications with focus on electrical insulation challenges

Ghassemi

2020

High Voltage

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“…However, their mechanical performance is far from satisfactory for wire insulation because these materials are hard and brittle in nature, which makes it impossible to survive a coil-winding process when used as wire insulation. Alternatively, plate-shaped ceramic particles were formed into thin sheets to impose mechanical bendability for electrical insulation such as mica papers [7,8]; however, the utilization of organic resin binders limited the enhancement of thermal performance. A commercial mica tape braided wire SK-650 from Von Roll offers temperature resistance beyond 500°C [9], but the loose contact of the mica tape to the wire and the thick braid is unfavorable for fabrication of dense windings.…”

Section: Introductionmentioning

confidence: 99%

Ceramic / inorganic-organic nano-hybrid composites for thermally stable insulation of electrical wires. Part II: Properties of the composite insulated wires

Pang

Hodgson

2020

IEEE Trans. Dielect. Electr. Insul.

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The paper Part I reported on the fabrication of high temperature capable electrical wires insulated with a new type of composite coatings comprising particulate ceramics and silicon-containing inorganic-organic nano-hybrids. This second paper studies the thermal, mechanical and dielectric properties of these composite insulated wires in accordance with relevant national standards. Techniques for materials characterization were also applied to provide information for better understanding the coatings' performance as wire insulation. Results showed that insulated wires have moderate dielectric strength comparable to ceramic insulation and excellent thermal stability, with insulation sustained for over 100 days at 500°C and prolonged period at 450°C under constant high temperature ageing and there is no obvious insulation degradation after thermal cycling for 20 times. The insulated wires demonstrated good mechanical properties, with interim flexibility allowing a minimal bending radius of 3 mm for 1.2 mm insulated wires. The resistance to abrasion and cutting through are also good enough to satisfy most practical applications.

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Historical Development of Insulation Materials and Systems

2014

Electrical Insulation for Rotating Machines

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Accelerated life testing of high voltage stator coils with enhanced PET-mica insulation system

Cited by 10 publications

References 3 publications

High power density technologies for large generators and motors for marine applications with focus on electrical insulation challenges

High power density technologies for large generators and motors for marine applications with focus on electrical insulation challenges

Ceramic / inorganic-organic nano-hybrid composites for thermally stable insulation of electrical wires. Part II: Properties of the composite insulated wires

Historical Development of Insulation Materials and Systems

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