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

Kun Liu, Xinzhou Dong, Z. Bo
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引用次数: 11

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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基于非常规仪表变压器和IEC61850的电流差动保护
非常规仪表变压器(NCIT)和IEC 61850是数字化变电站的关键技术。但它们给保护ied带来了新的不确定性,特别是现行差动保护中的时间同步问题。分析了NCIT和基于IEC61850的数字变电站中NCIT向电流差动继电器传送采样值的延时问题,找出了延时不确定性问题,最后提出了一种新的基于锁相环技术的电流差动保护方案。
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