Study of Non-Conventional Instrument Transformer and IEC61850 impact on current differential protection

Author

Liu, Kun ; Shenxing, S. ; Dong, X. ; Bo, Z.

Author_Institution

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

fYear

2008

fDate

13-15 Aug. 2008

Firstpage

1

Lastpage

6

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

IEC standards; differential transformers; phase locked loops; power transformer protection; substation protection; IEC61850; current differential protection; delay-non-deterministic problem; digital substations; nonconventional instrument transformer; phase-locked loops; time synchronization; Automatic control; Communication system control; Delay effects; IEC standards; Instrument transformers; Phase locked loops; Power transformer insulation; Substation automation; Substation protection; Uncertainty; IEC 61850; MU; NCIT; PLL; time synchronization;

fLanguage

English

Publisher

ieee

Conference_Titel

Transmission and Distribution Conference and Exposition: Latin America, 2008 IEEE/PES

Conference_Location

Bogota

Print_ISBN

978-1-4244-2217-3

Electronic_ISBN

978-1-4244-2218-0

Type

conf

DOI

10.1109/TDC-LA.2008.4641711

Filename

4641711