Transformer differential protection using calculated power

Author

Liping Wang ; Xiaoru Wang

Author_Institution

Sch. of Electr. Eng., Southwest Jiaotong Univ., Chengdu, China

Volume

1

fYear

2011

Firstpage

363

Lastpage

367

Abstract

A new differential protection principle for transformer is proposed utilizing calculated power in this paper. It is able to discriminate between inrush and internal fault of transformers with large capacity and extra high voltage, preventing the maloperation due to magnetizing inrush. The calculated power is derived based on two-port network equivalent. An algorithm is presented that is practical for implementing in microcomputer relays. The effectiveness is proved by applying the proposed method to a Y/D-11 two-winding transformer rated 667MVA, 500 /10.5kV by via EMTDC simulation.

Keywords

fault diagnosis; power transformer protection; relay protection; transformer windings; Y/D-11 two-winding transformer; apparent power 667 MVA; calculated power; inrush fault; internal fault; magnetizing inrush; microcomputer relays; transformer differential protection; two-port network equivalent; voltage 10.5 kV; voltage 500 kV; Automation; Power transformers; Relays; Surge protection; Surges; Windings; Calculated power; Differential protection; Magnetizing inrush; Transformer; Two-port network;

fLanguage

English

Publisher

ieee

Conference_Titel

Advanced Power System Automation and Protection (APAP), 2011 International Conference on

Conference_Location

Beijing

Print_ISBN

978-1-4244-9622-8

Type

conf

DOI

10.1109/APAP.2011.6180428

Filename

6180428