• Title/Summary/Keyword: 와전류손실

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Eddy Current Losses Characteristic Analysis of Canned Induction Motor (캔드형 유도전동기의 와전류 손실 특성 해석)

  • Song, Jung-Tae;Li, Jian;Cho, Yun-Hyun
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.859_860
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    • 2009
  • 본 논문에서는 유한요소법을 이용하여 캔드형 유도전동기의 와전류 손실 해석에 대해 다루고자 한다. 본 논문에서 제시하는 캔드형 유도전동기는 회전자와 고정자 사이에 물이나 화학물질이 흐를 수 있도록 고정자와 회전자를 얇은 캔으로 밀봉한 유도전동기로 산업분야에 이용되는 특수한 전동기이다. 캔드형 유도전동기의 캔에서 와전류로 인하여 발생되는 캔 손실이 상당히 크므로 전동기의 손실을 고려해야 한다. 캔드형 유도전동기의 와전류 손실 해석을 하기 위해 이론적인 등가회로도 법을 이용하여 와전류 손실 부분을 나타내며, 캔의 유무에 따라 와전류 손실 특성을 나타내고자 한다.

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Eddy Current Loss Analysis of Power Transformer Using Finite Element Method (유한요소법을 이용한 전력용 변압기의 와전류 손실 해석)

  • Lee, Ji-Yeon;Choi, Kil-Sun;Hahn, Sung-Chin
    • Proceedings of the KIEE Conference
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    • 2008.10c
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    • pp.71-73
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    • 2008
  • 본 논문에서는 유한요소법을 이용한 전력용변압기의 와전류 손실 해석에 대해 다루고자 한다. 와전류 손실 해석에서 사용할 전력용 변압기 설계 치수는 3D 자계 해석을 통해 검토하였다. 검토한 치수를 바탕으로 전력용 변압기를 2D 모델링하여 와전류 손실 해석을 하였으며, 2D, 3D 두 해석 결과 비교를 통해 와전류 손실에 대해 분석 및 검토하였다.

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Eddy Current Loss of the Cooling Plate According to its Shape for 600 KJ SMES (600 kJ SMES용 열 전도판의 구조에 따른 와전류 손실 특성)

  • Lee, Sang-Yub;Kwak, Sang-Yeop;Park, Myung-Jin;Kim, Woo-Seok;Lee, Ji-Kwang;Choi, Kyeong-Dal;Bae, Joon-Han;Kim, Seok-Ho;Sim, Ki-Duk;Seong, Ki-Chul;Jung, Hyun-Kyo;Hahn, Song-Yop
    • Proceedings of the KIEE Conference
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    • 2007.04c
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    • pp.132-133
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    • 2007
  • 본 논문에서는 600kJ급 SMES용 열전도판의 와전류 손실의 해석에 대해서 나타내었다. SMES의 운전 상태는 충전, 운전, 방전의 3가지 구간으로 나누어 볼 수 있다. 이 중 방전 구간에서는 SMES 코일에서의 전류 감소에 의해서 와전류 손실이 발생한다. 이때 발생하는 와전류 손실은 짧은 시간동안 발생하지만 그 크기가 크기 때문에, SMES 시스템 설계 시 냉각 시스템의 효율과 안정성을 위해서 반드시 고려되어야만 한다. 본 논문에서는 이러한 열 전도판의 와전류 손실을 해석하고, 그 형상의 변화에 따른 와전류 손실 값들을 분석하였다.

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Analysis of Eddy Current Loss Considering Interaction Effect in Metal Sheath of 154 kV Three Phase Power Cable (154 kV 3상 전력 케이블의 상호작용에 따른 금속 Sheath에서 발생하는 와전류 손실 분석)

  • Im, Sang Hyeon;Kim, Ki Byung;Park, Gwan Soo
    • KEPCO Journal on Electric Power and Energy
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    • v.6 no.4
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    • pp.389-392
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    • 2020
  • In order to accurately predict the losses in the power cable, analysis of the eddy current losses in the metal sheath is required. The copper loss is easily calculated by the resistance and current of the conductor, but it is difficult to measure and predict the eddy current generated from the metal sheath. For this purpose, the previous study analyzed the eddy current loss in single phase cable, but there is a limit to apply it because three phase cables are used in real environment. Therefore, in this paper, the eddy current loss occurring in the metal sheath of three phase cable according to the cause was analyzed theoretically. In addition, the eddy current loss occurring in the triangular and horizontal array were predicted through electromagnetic numerical analysis.

Analysis of Eddy Current Loss on Permanent Magnets of Interior Permanent Magnet Synchronous Motor for Railway Transit (철도차량용 매입형 영구자석 동기전동기의 영구자석 와전류 손실 분석 연구)

  • Park, Chan-Bae;Lee, Hyung-Woo;Lee, Byung-Song
    • Journal of the Korean Society for Railway
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    • v.15 no.4
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    • pp.370-375
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    • 2012
  • In order to apply Interior Permanet Magnet Synchronous Motor(IPMSM) to the propulsion system of the railway transit, 110kW class IPMSMs with high-power density are designed as a concentrated winding model and a distributed winding model in this study. The concentrated winding model designed in this study is 6 poles/9 slots and the distributed winding model is 6 poles/36 slots. In general, the eddy current losses in the permanent magnets of IPMSM are caused by the slot harmonics. The thermal demagnetization of the magnet by the eddy current losses at high rotational speed often becomes one of the major problems in the IPMSM with a concentrated windings especially. A design to reduce eddy current losses in permanent magnet design is important in IPMSM for the railway vehicle propulsion system which requires high-speed operation. Therefore, a method to devide the permanent magnet is proposed to reduce the eddy current losses in permanent magnet in this study. Authors analyze the variation characteristics of the eddy current losses generated in permanent magnet of the concentrated winding model by changing the number of the division of the permanent magnets.

Analysis of Eddy Current Distribution and Loss in Metal Sheath of 154 kV Single Power Cable (154 kV 단상 전력 케이블의 금속 Sheath에서 발생하는 와전류 분포 및 손실 분석)

  • Im, Sang Hyeon;Kim, Kyoung Youn;Kim, Ki Byung;Park, Gwansoo
    • KEPCO Journal on Electric Power and Energy
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    • v.6 no.2
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    • pp.115-118
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    • 2020
  • As interest in the reduction of energy loss has increased in recent years, analysis of losses in power cables is becoming more important. The overall loss in the transmission system can be measured, but there are many difficulties in researching the loss in each internal structure. There are various factors in the type of loss, and the loss of external factors by previous research has been studied. However, there is little research on the cable internal loss. Since the metal sheath inside the cable is made of aluminum having a high conductivity, an eddy current is generated due to the current flowing in the conductor, thereby causing an eddy current loss inevitably. In this paper, the eddy current loss in metal sheath of 154 kV Cable was researched through FEM (Finite Element Method) electromagnetic analysis.

Analysis of Eddy Current Loss in the Bobbin Type Cooling Plate for Winding (권선 보빈형 열전도판의 와전류 손실 해석)

  • Park, Myung-Jin;Kwak, Sang-Yeop;Lee, Sang-Yeop;Kim, Woo-Seok;Lee, Ji-Kwang;Choi, Kyeong-Dal;Bae, Joon-Han;Kim, Seok-Ho;Sim, Ki-Duk;Seong, Ki-Chul;Jung, Hyun-Kyo;Hahn, Song-Yop
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.144-145
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    • 2007
  • SMES의 운전 상태는 충전, 운전, 방전의 3가지 모드로 나눌 수 있으며, 충 방전 구간에서 와전류 손실이 발생한다. SMES의 에너지 방전 시 마그넷에서의 전류 감소로 인한 와전류 손실은 비록 짧은 시간동안 발생하지만 그 크기가 냉동기의 정격 열 부하 용량에 비해 상대적으로 크기 때문에, SMES 시스템 설계 시 이에 대한 영향을 고려해야 한다. 본 논문은 고온초전도 선재를 이용하여 개발 중인 600 kJ SMES의 방전 시, 마그넷을 냉각시키기 위한 권선 보빈형 열전도판의 분할과 슬릿의 위치에 따른 와전류 손실 변화를 3차원 유한요소법을 이용해 해석하고 그 결과를 제시하였다.

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Analysis of Eddy Current and Hysteresis Loss Distribution from Fixing Structure of 154 kV Underground Transmission Cable (154 kV 지중송전선로의 고정용 금구류에서 발생하는 와전류 및 히스테리시스 손실 분포 해석)

  • Song, Hyeeun;Im, Sanghyeon;Kim, Kyoung Youn;Park, Gwansoo
    • KEPCO Journal on Electric Power and Energy
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    • v.4 no.1
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    • pp.9-12
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    • 2018
  • The use of underground transmission power lines is expanding for the beauty and convenience of the near city. However, there is a lack of research on the losses from underground transmission power lines, especially those that support three-phase cables operating 24 hours a day. Since the supporting the cable is made of a material having a conductivity and a magnetic permeability, an eddy current and a hysteresis loss are generated due to a magnetic field caused by a current flowing in the cable. Losses occurring in this case adversely affect the power energy transfer efficiency, so research on loss is necessary. Therefore, in this paper, we analyzed the eddy currents and hysteresis losses that occur in a supporting a cable through three - dimensional finite element analysis.