大电流互感器五相外电流杂散磁场分析与等效方法
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摘要
利用正、负序分解法,定性分析了五相外电流在大电流互感器铁心中产生的杂散磁场的特性,基于单相外电流产生杂散磁场的物理数学模型,并运用相量法得到了杂散磁场的解析方程。通过试验验证了解析模型的正确性,并对如何实施大电流互感器抗外磁场干扰性能测试提出了建议。
The characteristics of stray magnetic field caused by five-phase current in heavy current transformer core are qualitative analysed with positive and negative sequence components method. Based on the mathematical model of single-phase current stray flux, the mathematical expression is obtained with phasor method. The correctness of mathematical model is verified by physical experiments. Some suggestions on how to measure the performance of heavy current transformer against external magnetic field interference are put forward.
The characteristics of stray magnetic field caused by five-phase current in heavy current transformer core are qualitative analysed with positive and negative sequence components method. Based on the mathematical model of single-phase current stray flux, the mathematical expression is obtained with phasor method. The correctness of mathematical model is verified by physical experiments. Some suggestions on how to measure the performance of heavy current transformer against external magnetic field interference are put forward.
引文
[1]Arnold A.Leakage phenomena in ring-type current transformers[J].Journal of the Institution of Electrical Engineers,1934,74(449):413-423.
[2]Seely S.Effect of stray flux on current transformers[J].Journal of Science and Technology,1970,37(3):115-120.
[3]梁之林,王朔.220k V电流互感器故障分析[J].变压器,2010,47(4):72-76.
[4]沙玉洲,王骞,袁韬,等.大型发电机用TPY级电流互感器同时适用于两种不同工作条件时参数的确定[J].变压器,2015,53(1):11-14.
[5]张皓,赵伟,屈凯峰,等.外部电流对电流互感器误差性能影响的研究[J].变压器,2008,45(9):24-28.
[6]Forrest H E.Influence of leakage flux under various conditions[J].Electrical Review,1948(9):51-54.
[7]屈凯峰.大电流互感器电磁屏蔽及抗干扰能力检定测试方法研究[D].北京:清华大学,2009.
[8]吴迪顺.大电流电流互感器的屏蔽[J].变压器,1980,17(4):1-7.
[9]张皓.电流互感器非均绕等安匝检定方法物理机理研究[D].北京:清华大学,2007.
[10]Imamura M,Nakahara M,Yamaguchi T,et al.Analysis of magnetic fields due to three-phase bus bar currents for the design of an optical current transformer[J].IEEE transactions on magnetics,1998,34(4):2274-2279.
[11]Namjoshi K,Lavers J D,Biringer P.Eddy-current power loss in toroidal cores with rectangular cross section[J].IEEE transactions on magnetics,1998,34(3):636-641.
[12]Pfuntner R.The accuracy of current transformers adiacent to high-current busses[J].Transactions of the American Institute of Electrical Engineers,1951,70(2):1656-1662.
[13]Shao H,Wu J,Lin F,et al.Effects of stray magnetic fields on the iron core of DCC[C].Precision Electromagnetic Measurements(CPEM),2012 Conference on,2012:492-493.
[2]Seely S.Effect of stray flux on current transformers[J].Journal of Science and Technology,1970,37(3):115-120.
[3]梁之林,王朔.220k V电流互感器故障分析[J].变压器,2010,47(4):72-76.
[4]沙玉洲,王骞,袁韬,等.大型发电机用TPY级电流互感器同时适用于两种不同工作条件时参数的确定[J].变压器,2015,53(1):11-14.
[5]张皓,赵伟,屈凯峰,等.外部电流对电流互感器误差性能影响的研究[J].变压器,2008,45(9):24-28.
[6]Forrest H E.Influence of leakage flux under various conditions[J].Electrical Review,1948(9):51-54.
[7]屈凯峰.大电流互感器电磁屏蔽及抗干扰能力检定测试方法研究[D].北京:清华大学,2009.
[8]吴迪顺.大电流电流互感器的屏蔽[J].变压器,1980,17(4):1-7.
[9]张皓.电流互感器非均绕等安匝检定方法物理机理研究[D].北京:清华大学,2007.
[10]Imamura M,Nakahara M,Yamaguchi T,et al.Analysis of magnetic fields due to three-phase bus bar currents for the design of an optical current transformer[J].IEEE transactions on magnetics,1998,34(4):2274-2279.
[11]Namjoshi K,Lavers J D,Biringer P.Eddy-current power loss in toroidal cores with rectangular cross section[J].IEEE transactions on magnetics,1998,34(3):636-641.
[12]Pfuntner R.The accuracy of current transformers adiacent to high-current busses[J].Transactions of the American Institute of Electrical Engineers,1951,70(2):1656-1662.
[13]Shao H,Wu J,Lin F,et al.Effects of stray magnetic fields on the iron core of DCC[C].Precision Electromagnetic Measurements(CPEM),2012 Conference on,2012:492-493.