Technical Development on Partial Discharge Measurement and Electrical Insulation Techniques for Low Voltage Motors Driven by Voltage Inverters

Ōkubo, H.; Hayakawa, Naoki; Montanari, Gian Carlo

doi:10.1109/tdei.2007.4401236

Cited by 96 publications

(37 citation statements)

References 53 publications

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“…For various reasons, the method has not been widely applied to low-voltage machines yet. However, the occurrence of PD in low-voltage motors under application of voltage surges has been subject to several investigations [116], [117], and the possible use of the PD method for low-voltage motors has been recently reported in [118] and [119]. Since the voltage level in low-voltage mains-fed machines is too low to induce PDs, the method is only applied to inverter-fed machines that are subject to repetitive voltage surges.…”

Section: F Pdmentioning

confidence: 99%

A Survey on Testing and Monitoring Methods for Stator Insulation Systems of Low-Voltage Induction Machines Focusing on Turn Insulation Problems

Grubic

Aller

Lü

et al. 2008

IEEE Trans. Ind. Electron.

411

178

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Abstract-A breakdown of the electrical insulation system causes catastrophic failure of the electrical machine and brings large process downtime losses. To determine the conditions of the stator insulation system of motor drive systems, various testing and monitoring methods have been developed. This paper presents an in-depth literature review of testing and monitoring methods, categorizing them into online and offline methods, each of which is further grouped into specific areas according to their physical nature. The main focus of this paper is on testing and monitoring techniques that diagnose the condition of the turn-to-turn insulation of low-voltage machines, which is a rapidly expanding area for both research and product development efforts. In order to give a compact overview, the results are summarized in two tables. In addition to monitoring methods on turn-to-turn insulation, some of the most common methods to assess the stator's phase-to-ground and phase-to-phase insulation conditions are included in the tables as well.

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Section: F Pdmentioning

confidence: 99%

A Survey on Testing and Monitoring Methods for Stator Insulation Systems of Low-Voltage Induction Machines Focusing on Turn Insulation Problems

Grubic

Aller

Lü

et al. 2008

IEEE Trans. Ind. Electron.

411

178

View full text Add to dashboard Cite

show abstract

“…Also, nverter power supplies implement the pulse modulation (PWM) technique, for which insulated gate bipolar transistors (IGBTs) are used as high speed switching devices, to improve the controllability of the motor torque and to reduce the switching loss [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Winding Coil Diameter on AC Insulation Breakdown Voltage of Polyamideimide/Nanosilica Wire

Park¹,

Woo²,

Lee³

et al. 2016

Transactions on Electrical and Electronic Materials

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The AC insulation breakdown voltage was investigated for seven types of winding coils made of polyamideimide (PAI), flexural PAI (nanosilica 5 wt%) and anti-corona PAI (nanosilica 15 wt%) wires with various winding coil diameters of φ5, φ15 and φ25 mm. The winding coil was made of enameled wire with an enamel thickness of 30~50 μm, and the rectangular copper wire had a thickness of 0.77~ to 0.83 mm and width of 1.17~ to 1.23 mm, respectively. The insulation breakdown voltages of the original PAI coils with diameters of φ5, φ15 and φ25 mm were 7.30, 6.58, and 5.95 kV, respectively, and those values decreased as the winding coil diameter increased, regardless of the wire types.

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“…And inverter power supplies with pulse modulated (PWM) technique, in which insulated gate bipolar transistors (IGBTs) are used as high speed switching device, can improve the controllability of the motor torque and reduce the switching loss [1][2][3]. Partial discharge (PD) is a key factor in the mechanism of the insulation breakdown due to the inverter surge [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ambient Temperature on Insulation Lifetime of Inverter Surge Resistant Enameled Wire Prepared with Organic/Inorganic Hybrid Nanocomposite

Park

2016

Transactions on Electrical and Electronic Materials

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Inverter surge resistant enameled wire was prepared with an organic/inorganic hybrid nanocomposite, and the effect of ambient temperature on the insulation lifetime of the enameled wire in the form of twisted pair was studied by a withstanding voltage tester. The organic polymer was Polyesterimide-polyamideimide (EI/AI) and the inorganic material was a Nano-sized silica (average particle size : 15 nm). The enamel thickness was 50 μm and the ambient temperature was 100℃, 150℃, 200℃, and 250℃, respectively. Transmission electron microscopy (TEM) observation showed that Nano-sized Silica were evenly dispersed in EI/AI. There were many air gaps in a twisted pair, therefore, when voltage was applied to the twisted pair, enamel erosion took place in the air gap area because of partial discharge accordi, ng to Paschen's law. As ambient temperature increased, insulation lifetime decreased according to Arrhenius relationship, which was explained by the increasing mobility of polymer chains in EI or AI. And insulation breakdown voltage value at 10 kHz was 1,864.5 sec (31.1 min), which is 1.9 times higher than at 20 kHz, 981.6 sec (16.4 min).

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Technical Development on Partial Discharge Measurement and Electrical Insulation Techniques for Low Voltage Motors Driven by Voltage Inverters

Cited by 96 publications

References 53 publications

A Survey on Testing and Monitoring Methods for Stator Insulation Systems of Low-Voltage Induction Machines Focusing on Turn Insulation Problems

A Survey on Testing and Monitoring Methods for Stator Insulation Systems of Low-Voltage Induction Machines Focusing on Turn Insulation Problems

Effect of Winding Coil Diameter on AC Insulation Breakdown Voltage of Polyamideimide/Nanosilica Wire

Effect of Ambient Temperature on Insulation Lifetime of Inverter Surge Resistant Enameled Wire Prepared with Organic/Inorganic Hybrid Nanocomposite

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