Title :
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
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;
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
DOI :
10.1109/TDC-LA.2008.4641711
