Partial discharge inception testing on low voltage motors

Bogh, D.; Coffee, J.; Stone, G.C.; Custódio, J. R.

doi:10.1109/pcicon.2004.1352807

Cited by 16 publications

(7 citation statements)

References 6 publications

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“…A type signs the benign, B type can be defined as medium and C type can also severe. [2] For every type of windings which are experienced short rise time voltage impulses of significant magnitude, high voltage stresses will be created many areas. These areas are listed as between conductors in different phases, between a conductor and ground and between adjacent turns in the line-end coil as shown fig.…”

Section: The Causes Of Partial Discharge At Motorsmentioning

confidence: 99%

Partial discharge inception voltage change in low voltage electric motors Case study: high dc current excitation effect

Ozcelik¹,

Onal²

2017

ARTTE

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Section: The Causes Of Partial Discharge At Motorsmentioning

confidence: 99%

Partial discharge inception voltage change in low voltage electric motors Case study: high dc current excitation effect

Ozcelik¹,

Onal²

2017

ARTTE

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“…This technique has been mainly developed to determine the quality and state of the insulation and prevent its premature aging and failure (for a comprehensive reference, see [23]). While such techniques have long been established for form-wound HV and MV machines, with many devices commercially available (e.g., [24]- [27]), the increased use of power electronics converters has also led to such techniques being developed for detection of PD in random-wound LV windings (e.g., [28]- [32]). Earlier techniques, notably for the HV and MV machines, were designed for offline application, with the rotor removed to increase the confidence in the signals, but methods for online detection have found recent interest, notably in the context of PD occurring with converter-fed LV machines.…”

Section: B Review Of Rf-based Bearing Current Detectionmentioning

confidence: 99%

On Radio-Frequency-Based Detection of High-Frequency Circulating Bearing Current Flow

Muetze

Niskanen

Ahola

2014

IEEE Trans. on Ind. Applicat.

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The possibility of bearing damage caused by inverterinduced bearing currents in modern variable-speed drive systems has been well recognized today. Further research is needed to develop appropriate nonintrusive methods for detection and monitoring of such currents. A radio-frequency-based nondestructive method has been applied to detect discharge bearing currents. The method is understood to work on the energy that is radiated in the electric field during the bearing discharge event. We show that the method is also applicable to high-frequency circulating bearing currents that have so far been associated with ohmic bearing characteristics and no discharges occurring. The analysis and understanding of the applicability of the method to detect such currents also contributes to further understanding of the electric characteristics of the bearing, notably the moment the current conduction begins.

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“…The amplitude of these overvoltages could become higher than the Partial Discharges Inception Voltage (PDIV) level due to resonant and reflection phenomena; if this occurs Partial Discharges (PDs) activity can take place [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Electrical aging tests on conventional and nanocomposite enamelled wires varying both the relative humidity and the applied voltage amplitude

Guastavino

Lollo

Porcile

et al. 2012

2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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Electrical machines and in particular electrical motors used in industry applications are usually coupled with inverter drives in order to better control both the motor torque and speed. Due to the presence of these inverter drives, the stator motor windings are subjected to severe voltage waveforms. When the electrical motors having stator windings insulated by means of type I random wire wound are subjected to this kind of severe voltage waveforms, reliability problems, due to the insulating system degradation, increase. In this research work, conventional and nanocomposite enamels have been analyzed: suitable twisted pair specimens insulated by the studied enamels have been prepared and tested. The tests were performed applying sinusoidal voltages having different amplitudes and varying the relative humidity. During the aging tests campaign the amplitude voltage waveform have been always set higher than the partial discharges inception voltage in order to operate in presence of surface partial discharges. The enamel breakdown conditions have been chosen as end-point criterion and the lifetime values have been collected and compared. In order to evidence the behavior of the considered conventional and nanocomposite enamels, the material life curves have been computed. Analyzing the obtained results it has been possible to find out the relations among the time to breakdown, the relative humidity and the voltage amplitude.

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Partial discharge inception testing on low voltage motors

Cited by 16 publications

References 6 publications

Partial discharge inception voltage change in low voltage electric motors Case study: high dc current excitation effect

Partial discharge inception voltage change in low voltage electric motors Case study: high dc current excitation effect

On Radio-Frequency-Based Detection of High-Frequency Circulating Bearing Current Flow

Electrical aging tests on conventional and nanocomposite enamelled wires varying both the relative humidity and the applied voltage amplitude

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