• Title/Summary/Keyword: Endwinding

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Analysis of Correlation Endwinding Breakdown and Insulation Test for Stator winding of Hydro-Generator (수력발전기 고정자권선의 단말부 절연파괴와 절연특성시험과의 관련성 분석)

  • Lee, D.L.;Lee, K.H.;Choi, K.N.;Kim, H.L.;Oh, B.K.
    • Proceedings of the KIEE Conference
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    • 2005.07e
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    • pp.103-105
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    • 2005
  • The test were performed to analyze the cause of endwinding breakdown of hydro-generator which had been in service after being constructed 1971. we conducted insulation diagnostic tests and checked visual inspection and operating condition of protective relays. On the basis of these test results, this paper tried to present the importance of service environment for the generator stator winding.

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Numerical and experimental analysis of temperature distribution in TEFC induction motor (전폐형 유도전동기의 온도분포에 관한 수치 및 실험적 해석)

  • Yun, Myeong-Geun;Go, Sang-Geun;Han, Song-Yeop;Lee, Yang-Su
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.21 no.3
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    • pp.457-472
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    • 1997
  • We studied the temperature distribution and heat transfer characteristics of TEFC induction motor with thermal network program for more efficient design and better cooling performance of it. We knew the characteristics and the windage loss of outer cooling fan from fan test experiments. Frame axial and peripheral heat transfer coefficients and endwinding heat transfer coefficient were measured by various model experiments and then, compared with other experimental results. Frame was the main heat transfer surface, load-side and fan-side surface were not thermally symmetric from the heat flux distribution analysis. Steady and unsteady temperature distributions were measured by real motor experiments. From the results, we knew that rotor surface temperature was higher than coil temperature and the hottest spot in the coil was loadside endwinding outside surface. We compared the simulation results with those of real motor test and the two results showed a good agreement.

Comparison of Nondestructive and Destructive Tests in High Voltage Motor Stator Windings (고압전동기 고정자 권선에서 비파괴와 파괴시험의 비교)

  • Ju, Young-Ho
    • Proceedings of the KIEE Conference
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    • 1999.07e
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    • pp.2097-2100
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    • 1999
  • Nondestructive and destructive tests were performed the stator windings of three high voltage motors prior to the rewind. Nondestructive tests included ac current increase rate($\Delta$I), dissipation factor(${\Delta}tan{\delta}$), and maximum partial discharge(Qm) The destructive tests included breakdown at three phases with ac voltage. Flashover occurred between the connected winding of endwinding and the stator flame. In two cases creeping discharge occurred between the individual phase windings and the wedges In the stator ends. The results of destructive tests could rarely be determined the breakdown voltage.

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The Design of a patch Sensor for Partial Discharge diagnosis in Rotating Machine Stator Windings (회전기 고정자 권선의 부분방전 진단을 위한 평면 Patch Sensor 설계)

  • Yang, Sang-Hyun;Lim, Kwang-Jin;Park, Noh-Joon;Park, Dae-Hee
    • Proceedings of the KIEE Conference
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    • 2008.10a
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    • pp.97-98
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    • 2008
  • In 6.6kV Rotary Machine Stator Windings, Corona Discharge, Discharge at Conductor Surface, Slot Discharge and Endwinding Discharge is happended by electronic degradation. Also, if Partial Discharge cause in inner-part of Rotary Machine Stator Windings, it will be happended voltage and current pulse. In case of discharge spark, RF electromagnetic wave, which transmits at discharge position, can happen. To detect this kind of RF electromagnetic wave efficiently, we have designed Planar Antenna Sensor with the CST MWS simulation program. Also we have confined the application possibility, which can analyzes the partial discharge in Rotary Machine Stator Windings. In the Future, sample of planar antenna sensor will be able to compare with the data of simulation by CST MWS program.

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Properties of On-Line Partial Discharge in Hydrogenerator Stator Windings (수력발전기 고정자 권선의 운전중 부분방전 특성)

  • Kim, Byong-Han;Kim, Hee-Dong
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.55 no.4
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    • pp.172-177
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    • 2006
  • During normal machine operation, partial discharge(PD) tests were performed with partial discharge analyzer(PDA) in two hydrogenerators. Six cable couplers were installed in circuit ring bus and endwinding of three phases. PDA showed that the normalized quantity number(NQN) and the partial discharge magnitude$(Q_m)$ were very low in hydrogenerator #1 and #2, respectively. The trend analyses of NQN and $Q_m$ value are available for monitoring of the insulation condition in hydrogenerator stator windings. The insulation condition of stator winding can be assessed. Discharge at conductor surface was discovered in B phase(C2 coupler) of hydrogenerator #1. Internal discharges were generated in A and C phases(C2 coupler) of hydrogenerator #1 and in A, Band C phases(C1 and C2 couplers) of hydrogenerator #2. Slot discharges occurred in A, Band C phases(C1 coupler) of hydrogenerator #1. The stator windings of two hydrogenerators were in good condition.

A Study on The Insulation Diagnostic and Life Evaluation for the Pumped Storage Generator/Motor (양수 발전 전동기 고정자 권선 절연진단 및 수명평가에 관한 연구)

  • Park, Jong-Jeong;Kim, Hee-Dong;Lee, Young-Jun;Ju, Young-Ho;Han, Sang-Ok
    • Proceedings of the KIEE Conference
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    • 1998.07e
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    • pp.1717-1720
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    • 1998
  • In pumped storage Generator-motor stator windings gradually deteriorates due to mechanist, thermal, electrical stresses. These stresses combine to result in loose windings, delamination of the stator insulation and/or electrical tracking of the endwinding, all of which can lead to stator insulation failures. Since the degration of generator-motor is gradually occurred, regular inspection system is necessary to monitor degrading. The result of this diagnosis is a basic for the maintxnance of generator-motor.

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Microstructure Property of High Voyage Motor Stator Insulation (고압전동기 고정자 권선 절연재료의 미세구조 특성)

  • 김희동;주영호
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.05a
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    • pp.513-517
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    • 1999
  • High voltage motor(rated 6.6kV and 448kw) has failed in the stator endwinding area during normal service. Experiments on microstructure property were conducted using the control and aged insulations, which were drawn out from stator windings of the high voltage motor. The analyses were characterized using stereozoom microscope(SM), scanning electron microscope(SEM) and energy dispersive X-ray spectroscopy(EDS). SM result shows that large voids are present in the interface between turn insulation and groundwall insulation. SEM results indicated that the groundwall insulation is rarely thermal stress. EDS results showed that chemical elements in the high voltage motor stator insulations were Al, Si, O, K and Fe.

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On-line partial discharge measurement techniques of hydro-generator windings (수력 발전기 권선에서의 운전중 부분방전 측정기법)

  • 황동하;김진봉;김용주;박명수;김택수
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.45 no.2
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    • pp.294-300
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    • 1996
  • In hydro-generator, a groundwall insulation of stator windings gradually deteriorates due to mechanical, thermal, electrical and environmental stresses. These stresses combine to result in loose windings, delamination of the stator insulation and/or electrical tracking of the endwinding, all of which can lead to stator insulation failures. Conventionally, off-line tests such as partial discharge measurement, DC/AC current and .DELTA.tan.delta. tests has been used for estimation of winding condition. However, off-line test requires large power supply and generator outage. In addition, major cause of insulation problems such as loose wedges and slot dischages may not be found with off-line diagnoses. This paper introduces the on-line partial discharge measurement techniques using frequency spectrum analyzer(FSA) for the generator stator windings. The experimental results from the UIAM #1 hydro-generator confirms a optimistic application of on-line generator diagnosis method as a reliable tool for evaluation of winding condition.

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The Design of a Planar Antenna Sensor for Partial Discharge diagnosis in 6.6kV Rotary Machine Stator Windings (6.6kV 회전기 고정자 권선에서 부분방전 진단을 위한 평판 안테나 센서 설계)

  • Lim, Kwang-Jin;Lwin, Kyaw-Soe;Shin, Dong-Hoon;Park, Noh-Joon;Park, Dae-Hee
    • Proceedings of the KIEE Conference
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    • 2007.11a
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    • pp.222-223
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    • 2007
  • In 6.6kV Rotary Machine Stator Windings, Corona Discharge, Discharge at Conductor Surface, Slot Discharge and Endwinding Discharge is happended by electronic degradation. Also, if Partial Discharge cause in inner-part of Rotary Machine Stator Windings, it will be happended voltage and current pulse. In case of discharge spark, RF electromagnetic wave, which tranmits at discharge position, can happen. To detect this kind of RF electromagnetic wave efficiently, we have designed Planar Antenna Sensor with the CST MWS simulation program. Also we have confined the application possibility, which can analize the partial discharge in Rotary Machine Stator Windings. In the Future, sample of planar antenna sensor will be able to compare with the data of simulation by CST MWS program.

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Rotor fan effects on end winding heat transfer in totally enclosed fan cooled induction motor (전폐형 유도전동기 엔드와인딩 표면의 열전달에 미치는 회전자팬의 영향)

  • Yun, Myeong-Geun;Go, Sang-Geun
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.21 no.7
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    • pp.928-938
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    • 1997
  • The end winding is an important part in induction motor for thermal analysis. But there is little information on the heat transfer coefficient of that surfaces because of geometrical complexity. So our experimental object is to know the heat transfer coefficient of end winding and find the optimum design parameter of rotor fan. Carbon coated papers were used for a uniform heat generating surfaces which were easy to fabricate. The experiments of some parameters were performed as varying rotation speed of rotor fan. We obtained the local and average Nusselt number of the end winding surfaces by correcting radiation and conduction losses errors. The results showed that the average Nusselt number increased with rotor fan blade number and width but decreased with end winding length. However, the increasing limits existed in the case of rotor fan width and blade number. So optimum design value were obtained for rotor fan width and blade numbers.