• 제목/요약/키워드: Winding Resistance

검색결과 160건 처리시간 0.031초

삼상유도전동기 권선저항 측정이 효율 산출에 미치는 영향에 관한 연구 (A Study on the Measurement of the Winding Resistance Influences the Efficiency Evaluation of 3phase Induction Motors)

  • 강병국;김광민;이주
    • 조명전기설비학회논문지
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    • 제30권3호
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    • pp.73-78
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    • 2016
  • 3phase induction motor consumes 40% of national electric power. so It is one of the most important electric device for the national power policy. The efficiency measurement is carried out by IEC standards. After the temperature rise test, It's difficult to measure the winding resistance immediately. because of inertia and power cut-off time. Therefore, IEC standards suggest the measurement time. But during the measurement time, the winding temperature cools down. It causes the value of winding resistance is variable. Several conditions which possibly occurred by the measurement time of IEC 60034-1 are suggested. and The efficiency evaluation of 3phase induction motors is carried out by IEC 60034-2-1 with the several conditions. As the results, we find out the winding resistance rapidly goes down within 15 sec. so It proves that the winding resistance should be measured within 15 sec. for the efficiency evaluating of 3phase induction motor.

초전도발전기의 계자권선 보호저항 선정에 관한 연구 (Protection Resistance Determination for Field Winding in Superconducting Generator)

  • 강준선;나완수;권영길;손명환;류강식
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 A
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    • pp.238-240
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    • 1999
  • In this paper, the protection resistance determination for the field winding in superconducting generator is suggested. To protect the field winding in a generator, they usually use the external resistance to decrease the field current more rapidly when quench occurs in the winding. Since the field winding is actually separated into four sections (magnets), we have choices to insert 1, 2, and 4 external resistances. For each case, the current decay and the voltages across e winding are calculated, and we can choose the best external resistance.

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초전도 한류소자의 병렬연결에 따른 자속구속형 초전도 한류기의 특성 분석 (Characteristics of a Flux-Lock Type Superconducting Fault Current Limiter According to the Parallel Connection of the Superconducting Elements.)

  • 오금곤;정병익;최효상
    • 전기학회논문지P
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    • 제57권2호
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    • pp.198-201
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    • 2008
  • We investigated the operating characteristics of the flux-lock type superconducting fault current limiter(SFCL) with the parallel connection between the primary and secondary windings which are connected with two superconducting units in series. The parallel connection for current level increase of the flux-lock type SFCL is necessary to apply the SFCL into the power system. The resistance generated in superconducting units was dependent upon the winding direction of the primary and the secondary coils, which can reduce the power burden. The resistance of the superconducting elements in the subtractive polarity winding is higher than that of the additive polarity winding. The fault current limiting effect of the subtractive polarity winding is better than that of the additive polarity winding. From this results, we confirmed that the power capacity of the flux-lock type SFCL could be increased by the parallel connection of the superconducting units.

이중 ?치를 이용한 변압기형 초전도 한류기의 권선전류와 초전도소자 저항에 따른 전력소모 및 누적에너지 분석 (Analysis on Power Consumption and Accumulated Energy According to Resistance of Superconducting Element and Winding Current of Transformer Type SFCL Using Double Quench)

  • 한태희;임성훈
    • 한국전기전자재료학회논문지
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    • 제29권10호
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    • pp.630-634
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    • 2016
  • In this paper, we analyzed the power consumption and the accumulated energy in HTSC (high-TC superconducting elements) according to the resistance of HTSC element and the winding current of transformer type SFCL (superconducting fault current limiter) using double quench. For the analysis, two different inductances of the one secondary winding among two secondary windings comprising the transformer type SFCL were selected and the short-circuit tests were carried out. The consumed power and the accumulated energy in HTSC element connected into the secondary winding with larger inductance were analyzed to be larger compared to the one connected into the secondary winding with lower inductance.

변압기의 권선변형 검증을 위한 LVI 시험기 개발 (The Development of LVI Tester for WInding Deformation Measurement in Power Transformers)

  • 조국희;김광화;곽희로
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2000년도 학술대회논문집
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    • pp.251-256
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    • 2000
  • The assessment of the condition of a transformer winding which is suspected of having suffered short circuit damage can be difficult. Conventional test such as winding resistance, magnetisation current or insulation resistance will only detect damage if a permanent electrical fault exists. Visual inspection of windings necessitates the removal of oil and in many cases only a very small proportion of the winding can be seen. We describe the characteristics. As the front rise time of recurrent-surge generator pulse less than 1000ns and the peak value of pulse is about 500V, we have the good results of detecting winding deformation in the LVI test of transformers.

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고온초전도변압기의 특성해석 (The Characteristics Analysis of a HTS Transformer)

  • 이희준;차귀수;이용욱;한송엽
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제49권1호
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    • pp.27-31
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    • 2000
  • This paper presents the performance evaluation of an HTS transformer. Numerical calculation by finite element method was used to evaluate the performance. BSCCO-2223 HTS tapes and double pancake winding were adopted in this design. Four double pancake windings were used in total. Among them two windings were connected in series for high voltage winding and two windings are connected in parallel for low voltage winding. Propertied of various type of the winding arrangement were examined. Characteristics of the transformer during the transient which was caused by sudden short were simulated. The current limiting effect, temperature rise and resistance growth of the superconducting winding were shown.

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No-insulation 기법을 적용한 소용량 고온 초전도 코일의 영구전류 특성에 관한 연구 (A Study on the Basic Characteristics of Persistent Current Mode Operation for Small Scale High Temperature Superconducting Coil with No-insulation Winding Method)

  • 이태성;이우승;최석진;조현철;김형준;이지호;강재식;권오준;이해근;고태국
    • 한국초전도ㆍ저온공학회논문지
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    • 제14권3호
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    • pp.23-27
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    • 2012
  • This paper aims to evaluate the feasibility of using no-insulation High Temperature Superconducting (HTS) coil in persistent current mode system. A HTS coil in persistent current mode system usually includes one or more non-superconducting joints in its circuit. And the current decaying rate of the coil is affected by the resistance of joint in persistent current circuit. If the resistance of joint is large, decaying rate of the current drastically increases. Therefore, reducing the joint resistance of the HTS coil is very important in persistent current mode system. In this paper, the no-insulation HTS coil is suggested as a way to reduce the joint resistance with the embedded parallel contact resistance naturally made by no-insulation winding method. Two small coils are fabricated with insulation and no-insulation winding method, and persistent current mode system experiment of each coil is preformed and analyzed.

절연진단법을 이용한 고전압전동기 고정자권선의 절연특성분석 (Analysis of Insulation Characteristics for High-voltage Motor Stator Winding using Insulation Diagnostic Test)

  • 오봉근;강현구;김현일;임기조
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2009년도 하계학술대회 논문집
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    • pp.404-405
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    • 2009
  • Insulation diagnostic tests for high voltage motor stator winding were conducted to analyze the insulation characteristics. Test motors were manufactured same factory and year(1996). Insulation characteristics of moisture winding are different from those of deteriorative winding. Insulation resistance and disscipation factor test results are sensitive to moisture winding. AC current, disscipation factor tip-up and PD test results are sensitive to deteriorative winding. Also, Capacitance value for stator winding insulation material has characteristic of increasing in moisture winding.

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변압기 권선변형 진단에 적용하기 위한 LVI 시험기 개발 (The development of LVI tester for application of transformers winding deformation diagnosis)

  • 조국희;김광화
    • 조명전기설비학회논문지
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    • 제16권5호
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    • pp.97-103
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    • 2002
  • 본 논문은 LVI 시험기를 개발하여 모델 변압기 및 유입식 변압기에 적용해 LVI 시험 분석기술을 개발하였다. LVI시험기는 본체, 터미널 박스 및 케이블로 구성하였고, ANSI규격에서 요구하는 출력특성을 갖도록 설계 제작하였다. 모델 변압기는 탭들을 만들어 변압기의 권선변형 모델을 만들 수 있도록 하였고, 유입식 변압기는 실제 현장에서 사용되는 3상 변압기이다. LVI 시험기는 펄스폭이 1000 ㎱ 이하의 파두 시간과 펄스 최대 전압 500 V로 제작되었다. LVI 시험기로써 실험을 실시하여 성능을 평가한 결과 측정된 파형 분석으로 권선의 축방향과 반경방향으로의 움직임을 구별할 수 있어 변압기 예방 진단에도 효과가 기대된다.

Short-circuit Analysis of Solenoid and Pancake Type Bifilar Winding Magnets using BSCCO tape

  • Park Dong Keun;Ahn Min Cheol;Yang Seong Eun;Yoon Il Gu;Kim Young Jae;Ko Tae Kuk
    • 한국초전도ㆍ저온공학회논문지
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    • 제7권4호
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    • pp.28-31
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    • 2005
  • To verify the feasibility of bifilar winding type superconducting fault current limiter (SFCL) using BSCCO tape, two types of magnets were fabricated and tested by short-circuit in this research. Even if the FCL using high Tc superconducting (HTS) tape has zero resistance in normal state, it needs to be wound as a bifilar winding for zero inductance. Solenoid type and pancake type bifilar winding magnets are designed and fabricated with the same length of BSCCO tape. The test system consists of AC power supply, transformer, fault switch, load and bifilar winding magnet. The applied AC voltages during fault duration, 0.1s, were from 0.5V to 20V. The test results without bifilar winding magnet were compared with those with each type magnets. The test results include voltage against magnet, transport current and generated resistance curve. Thermal stability, the recovery time, was studied from the results of two type magnets. The pancake type was the most effective to limit fault current but the solenoid type was thermally the most stable. From this research, short-circuit characteristics of the two types were obtained.