Evidence of charge injection resulting from fast pulse operation of inverter drives

Hudon, C.; Amyot, N.; Kandev, Nédeltcho

doi:10.1109/ceidp.1998.732997

Cited by 4 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both space charge accumulation and PD erosion will cause turn insulation degradation and eventually the pre-mature failure of the stator-winding insulation system [3,4]. Despite the increased interest in turn insulation degradation, the mechanisms related to space charge formation and ageing are not well understood in medium voltage form-wound stator coils.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Charge injection into enamelled wires studied by thermally stimulated depolarization current (TSDC)

Haq

Jayaram

Cherney

et al.

CEIDP '05. 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2005.

View full text Add to dashboard Cite

The paper reports on measurements of thermally stimulated depolarization current (TSDC) that is applied to characterize changes in medium voltage rotating machine enamelled wires that have been exposed to ageing under a pulse width modulated (PWM) waveform. An elevated temperature polarization process is used which provides various information on the relaxation processes in multiple coated magnetic wires such as the disorientation of dipoles and the release of charges from trapping sites. The thermoelectrets were prepared at various polarizing fields and measurements of TSDC are carried out both as a function of time and temperature over the range of 23 to 2000C. The various trapping levels, which have discreet energy differences having distinct peaks in the thermograms, are discussed on the basis of space charge polarization.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Curves 1 and 2 represent the current release from a specimen polarized for lh at 1 kV and 1.5 kV steep-front unipolar pulses. Effect of polling field on TSDC spectra of sJmll bar specimens for T. = 12OT: steep-fron unipolar pulse (1) 1 kV, (2) 1.5 kVp (3) 2 kVp, (4) 2.5 kVp,(5) 3 kVp, (6) 3.5 kVp.…”

mentioning

confidence: 99%

Charge injection into enamelled wires studied by thermally stimulated depolarization current (TSDC)

Haq

Jayaram

Cherney

et al.

CEIDP '05. 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2005.

View full text Add to dashboard Cite

show abstract

Aging Time Effect on PD and Space Charge Behavior in magnet wire under High PWM Voltages

Zhou

Deng

et al.

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation

View full text Add to dashboard Cite

New tools to determine the partial discharges of inverter fed motor

Guo

Wen

Zhan

et al.

Proceedings of the 2004 IEEE International Conference on Solid Dielectrics, 2004. ICSD 2004.

View full text Add to dashboard Cite

With the development of AC drive and power electronic elements, inverter supplies apply to W o n motors widely. At the same time, inverter mechanism brings on premature insulation aging in numbers of inverter fed motors all over the world. Insulation aging seems to be correlated with the partial discharges (PD) activity of surges with very fast rise time and high frequency. With the traditional method, it is hard to distinguish the PD signals from the surges. This paper introduces a new instrument, which can accurately measure the characteristics of PD during lOOns rise time surges. In addition, it can also be used to measure the partial discharge inception voltage (PDIV) and other characteristics of PD in inverter fed motors under local surge conditions. INSTRUCTIONSIn the past few years, rapid advances in power electronic components have lead to a new source of voltage surges [l]. Inverter Fed Drives (IFDs) of the PWM-type using IGBTs apply to traction motors widely. But these IFDs can create up to 20,000 fast risetime voltage surges per second, which lead to the electrical breakdown of the interturn insulation in motor windings.In lots of cases, the breakdown occurred at the first turn of windings of the motor [2-31.It is known that the reflected wave at the motor's terminal can lead to overshoot which is about twice to three times of normal condition, while the first turn of stator winding may take on about 90% of voltage under fast risetime voltage surges. Therefore, during the effect of fast cut-off surges, the first turn may take on over 20 times of voltage than normal magnitude. This overshoot is the main reason for breakdown of minor insulation in windings, especially of interturn insulation around the first turn of windings of variable frequency traction motor.It has been shown that the breakdown of minor insulation in windings is correlated to the partial discharge activity of surges with very fast risetimes and high magnitudes [4-61. But current partial discharge measuring systems are completely inappropriate for the measurement of partial discharges at PWM inverter fed motor, for the frequency spectra of the surges 6om the PWM inverters the frequency spectra of the pulses of partial discharges are found in the same measurement range and the surges are able to hide completely the signal of the partial discharges [7-91. In addition, only sine-shaped operation voltages are used in current PD measuring systems, which is very different from the IFDs [ll-131. This paper discusses a new PD measuring system, which has been developed to detect the partial discharge signals in traction motors fed by PWM inverter. That's a new tool to study the insulation aging caused by fast risetime surges. TEST CIRCUITThe fundamental circuit diagram of the experimental setup is presented in Figure 1. Unlike the PD measuring systems described earlier, this system is intended to be effectively and economically applied to monitor the partial discharges in inverter fed motors. Here, C, is the equivalent capacitance of the test s...

show abstract

Evidence of charge injection resulting from fast pulse operation of inverter drives

Cited by 4 publications

References 5 publications

Charge injection into enamelled wires studied by thermally stimulated depolarization current (TSDC)

Charge injection into enamelled wires studied by thermally stimulated depolarization current (TSDC)

Aging Time Effect on PD and Space Charge Behavior in magnet wire under High PWM Voltages

New tools to determine the partial discharges of inverter fed motor

Contact Info

Product

Resources

About