Title :
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
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;
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
DOI :
10.1109/UPEC.2008.4651444
