The improvement of the digital differential relay in on-load tap changer transformer

Author

Zhao, W.K. ; He, J.H. ; Bo, Z.Q. ; Klimek, A.

Author_Institution

Dept. of Electr. Eng., Beijing Jiaotong Univ., Beijing, China

fYear

2009

fDate

6-7 April 2009

Firstpage

1

Lastpage

4

Abstract

An advanced method for improving the sensitivity of the digital differential protection is presented in this paper. The new approach based on adaptive adjustment of the percentage differential protection takes into account the tap position of the power transformer with on-load tap changer. The digital differential protection can be more sensitive to the faults of transformer by reducing the unbalance current caused by the tap changing. The presented method has been tested by the internal fault of transformer model set up with PSCAD, which is proved to be suitable for sensitivity improvement.

Keywords

on load tap changers; power transformer protection; relay protection; PSCAD; digital differential protection; digital differential relay; on-load tap changer transformer; power transformer; transformer faults; Automation; Current transformers; Digital relays; On load tap changers; PSCAD; Power system protection; Power system relaying; Power transformers; Protective relaying; Testing; Differential protection; Digital relay; PSCAD; Sensitivity; Transformer tap changer;

fLanguage

English

Publisher

ieee

Conference_Titel

Sustainable Power Generation and Supply, 2009. SUPERGEN '09. International Conference on

Conference_Location

Nanjing

Print_ISBN

978-1-4244-4934-7

Type

conf

DOI

10.1109/SUPERGEN.2009.5348004

Filename

5348004