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Optimizing the operation of current differential protection by power differential relay for three phase transformer

Bahmani, B ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: 10.1109/IEEEGCC.2006.5686196
  3. Publisher: 2006
  4. Abstract:
  5. To avoid the needless trip by magnetizing inrush current, the second harmonic component is commonly used for blocking differential relay in power transformers. However, the main problems of the current comparison method are in the very high inrush currents and relatively small fault currents regarding winding short circuits. Also The second harmonic component in fault current is increased in long lines which may blocks the relay operation. This paper describes a method to discriminate internal fault from inrush current and faults with a high second harmonic component by the sum of active power flowing into the transformer from each terminal. The average power is almost negligible for energizing, but an internal fault consumes large amounts of power
  6. Keywords:
  7. Active power relays ; EMTP ; Magnetizing Inrush ; Protection ; TACS ; Transformer ; Electric relays ; Harmonic analysis ; Power transformers ; Transformer protection
  8. Source: 2006 IEEE GCC Conference, GCC 2006, Manama, 20 March 2006 through 22 March 2006 ; 2006 ; 9780780395909 (ISBN)
  9. URL: https://ieeexplore.ieee.org/document/5686196