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Current-Transformer Saturation Compensation for Transformer Differential Relays

Hajipour, E ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1109/TPWRD.2015.2411736
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2015
  4. Abstract:
  5. Current-transformer (CT) saturation threatens accurate discrimination between internal fault current and magnetizing inrush current of a transformer and endangers the proper operation of a differential relay. Thus, compensation of CT saturation could substantially improve the performance and security of transformer differential relays. So far, almost all of the technical literature in this field has focused exclusively on fault current compensation. However, this paper proposes an efficient compensation algorithm to reconstruct the fault and inrush currents which are distorted by CT saturation. Some of the attractive features of the proposed method are its accuracy, fast response time, desired sample-by-sample output, no dependency on power system topology, immunity against noise and harmonics, and its simplicity. These features are extracted through the application of numerous test cases reflecting a wide range of variations in fault and inrush currents. The proposed algorithm proves to be fast, accurate, and reliable
  6. Keywords:
  7. Current transformer (CT) ; Fault current ; Saturation ; Electric fault currents ; Electric instrument transformers ; Electric relays ; Electric transformers ; Saturation (materials composition) ; Compensation algorithm ; Current transformer saturation ; In-rush current ; Internal fault currents ; Magnetizing inrush currents ; Power system topology ; Signal compensation ; Transformer differential relay ; Electric currents
  8. Source: IEEE Transactions on Power Delivery ; Volume 30, Issue 5 , 2015 , Pages 2293-2302 ; 08858977 (ISSN)
  9. URL: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7057675