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变压器和应涌流分析 被引量:28

Research on sympathetic inrush in operating transformer
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摘要 以2台单相变压器并联运行为例,利用励磁涌流偏向时间轴一侧的特点,解释了和应涌流的产生机理及其变化特点,指出和应涌流产生的本质原因是由于合闸变压器励磁涌流流过系统电阻使得其他变压器工作母线电压偏移,导致铁芯饱和造成的。初步分析了系统电阻、线路阻抗、空投变压器不同剩磁以及运行变压器二次侧负载对和应涌流的影响,讨论了和应涌流对变压器差动保护和后备保护的危害,其非周期分量长期作用引起的电流互感器局部暂态饱和以及差流中二次谐波含量降低是造成差动保护误动的主要原因。提出了相应的防范措施:在条件允许的情况下将电流互感器从P级更换为TP级以防止其暂态饱和;在满足灵敏度要求的前提下适当提高发电机及变压器差动保护的定值;尽量避免可能产生和应涌流的运行操作;正确整定变压器电流距离保护的各段定值;利用二次谐波分量构成零序二次谐波制动判据防止差动保护误动;寻求更可靠的主保护原理或完善纵差保护原理。 Taking two single-phase transformers in parallel as example,the principle and characteristics of sympathetic inrush are explained according to the fact that the inrush current leans to time axis. The sympathetic inrush is essentially caused by the deviation of bus voltage and the consequent core saturation of adjacent transformer during the inrush current of the energized transformer running across the system resistance. The influence of system resistance,line impedance, different residual fluxs of no- load transformer and secondary load of operating transformer on sympathetic inrush are analyzed and the harm of sympathetic inrush to transformer differential protection and back- up protection are discussed. The local transient saturation of current transducer caused by the permanent effect of nonperiodic component of sympathetic inrush and the decrease of secondary harmonic in differential current are main factors resulting in the misoperation of differential protection,and corresponding countermeasures are proposed:change current transducer from P rank to TP rank to prevent its saturation if possible;increase settings of generator and transformer differential protection while the sensitivity is satisfied;try to avoid the operation causing sympathetic inrush; correctly set sect settings of transformer current distance protection;apply secondary harmonic to form the zero- sequence secondary harmonic triggering criterion to avoid the misoperation of differential protection;find out more reliable main protection principle or improve the principle of longitudinal differential protection.
出处 《电力自动化设备》 EI CSCD 北大核心 2006年第10期7-12,共6页 Electric Power Automation Equipment
基金 国家自然科学基金项目(50347026 50467002) 云南省科技攻关项目(2003GG10) 云南省自然科学基金项目(2005F0005Z 2004E0020M 2002E0025M)~~
关键词 变压器 和应涌流 差动保护 应对措施 transformer sympathetic inrush differential protection countermeasure
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  • 1唐跃中,刘勇,郭勇,刘世明,陈德树.几种变压器励磁涌流判别方法的特点及其内在联系的分析[J].电力系统自动化,1995,19(9):53-59. 被引量:54
  • 2孙志杰,陈云仑.波形对称原理的变压器差动保护[J].电力系统自动化,1996,20(4):42-46. 被引量:115
  • 3朱亚明,郑玉平,叶锋,顾洁纯,王正航.间断角原理的变压器差动保护的性能特点及微机实现[J].电力系统自动化,1996,20(11):36-40. 被引量:51
  • 4王维俭.电气主设备继电保护原理及应用[M].北京:中国电力出版社,1998..
  • 5王维俭 候炳蕴.大型机组断电保护理论基础[M].北京:中国电力出版社,1996..
  • 6王怀智.大坝发电厂1号机组大差保护误动原因的分析研究.第六届全国继电保护学术研讨会论文集[M].深圳:中国电机工程学会继电保护专业委员会,1996..
  • 7胡玉峰 陈德树 尹项根 等(HU Yu-feng CHEN De-shu YIN Xiang-gen et al):.微机变压器保护中几种谐波制动计算的比较(The Comparison of Several Harmonic-restraint Algorithms Used in Microcomputer-based Transformer Relay)[J].继电器,.
  • 8Grcar B,Dolinar D,Ritonja J,et al.System Analysis of Differential Power Transformer Protection.In:Proceedings of Fourth International Conference on Developments in Power System Protection,(IEE Pub No 302).1989:220~224.
  • 9Minorsky N. Nonlinear Oscillation. Van Nostrand(NJ):Princeton,1962.432~433.
  • 10陈增田.电力变压器保护(第2版)[M].北京:水利电力出版社,1989..

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