2008•Unpublished venueRequires access

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

Kun Liu, Xinzhou Dong, Zhiqian Bo

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.

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Available abstract

Key concepts: Differential protection, Current transformer, IEC 61850, Protective relay, Relay, Electronic engineering, Transformer, Differential (mechanical device)