Current differential protection based on Non-Conventional Instrument Transformer and IEC61850

Author

Liu, Kun ; Dong, Xinzhou ; Bo, Zhiqian

Author_Institution

Dept. of Electr. Eng., Tsinghua Univ., Beijing

fYear

2008

fDate

1-4 Sept. 2008

Firstpage

1

Lastpage

5

Abstract

Non Conventional Instrument Transformer (NCIT) and IEC 61850 are crucial technologies in digital substations. But they bring some new uncertainties to protection IEDs, especially the time synchronization issue in current differential protection. The paper analyzes the time delay of transferring sampled values from NCIT to current differential relay in NCIT and IEC61850 based digital substation, then finds out the delay-non-deterministic problem, at last presents a novel current differential protection scheme by using Phase-Locked Loops (PLL ) technology.

Keywords

instrument transformers; substation protection; IEC61850; current differential protection; differential relay; digital substations; instrument transformer; phase-locked loops technology; time synchronization; Delay effects; Digital relays; IEC standards; Instrument transformers; Power system protection; Power system simulation; Power transformer insulation; Protective relaying; Substation automation; Substation protection;

fLanguage

English

Publisher

ieee

Conference_Titel

Universities Power Engineering Conference, 2008. UPEC 2008. 43rd International

Conference_Location

Padova

Print_ISBN

978-1-4244-3294-3

Electronic_ISBN

978-88-89884-09-6

Type

conf

DOI

10.1109/UPEC.2008.4651444

Filename

4651444