• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 18 Issue 2
Apr.  2005
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Article Contents
LUTao. OperationalEquation and Setting ofDifferentialProtection for Impedance-M atching Balance Transformer[J]. Journal of Southwest Jiaotong University, 2005, 18(2): 158-162.
Citation: LUTao. OperationalEquation and Setting ofDifferentialProtection for Impedance-M atching Balance Transformer[J]. Journal of Southwest Jiaotong University, 2005, 18(2): 158-162.

OperationalEquation and Setting ofDifferentialProtection for Impedance-M atching Balance Transformer

  • Publish Date: 25 Apr 2005
  • If impedance matching coefficientKZ≠3 + 1 for an impedance-matching balance transformer with differential protection based on phase current on primary side, there is inherent differential curren,t andmay result inmal-operation. Thisproblem was solved by taking the differences in phase currenton primary side as the parameters to form the operationalequations. Setting ruleswere discussed and formulaewere derived for impedance-matching balance transformersbased on the 3-slope operation characteristic, where the effects of normalmismatch curren,t current-transformer saturation and inrush currenton differential currentprotectionwere taken into consideration.

     

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      沈阳化工大学材料科学与工程学院 沈阳 110142

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