﻿ 电磁式电流互感器的GIC直流偏磁谐波分析

# 电磁式电流互感器的GIC直流偏磁谐波分析The Harmonics Analysis of Current Transformer under DC Bias Induced by GIC

Abstract: Geomagnetic induced current (GIC) and the High Voltage Direct Current (HVDC) systems under mono-polar operation may lead to DC bias of current transformers (CT), which may have an effect on transferring characteristics of CT and result in the mal-operation of metering devices and transformer differential protection. This paper analyzes the generation mechanism of DC bias of CT caused by GIC, and an equivalent analysis model for CT in the AC power system is established based on Jiles-Atherton model in PSCAD/EMTDC. This article also analyzes the distortion levels of the exciting current and its harmonics under the condition of DC bias induced by different amplitudes of GIC, and how CT ratios have effect on its saturation is discussed as well.

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