Effects of geomagnetically induced current on transferring characteristics of current transformer and transformer differential protection

被引：1
作者：
Zheng, Tao [1 ]
Chen, Peilu [1 ]
Liu, Lianguang [1 ]
Mao, Anlan [2 ]
机构：
[1] State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University
[2] China Electric Power Research Institute (Wuhan)
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2013年 / 37卷 / 22期
关键词：
Current transformer; DC bias; Geomagnetically induced current (GIC); Partial transient saturation;
D O I：
10.7500/AEPS201210105
中图分类号：
学科分类号：
摘要：
DC bias may affect the transferring characteristics of the current transformer, threatening the operation of differential protection. Compared with the DC bias caused by high voltage direct current (HVDC) transmission, the bias magnetic flux resulting from geomagnetically induced current (GIC) is more complex, especially when considering its effects on current transformer transferring characteristics. The differences between GIC bias and DC bias are analyzed in detail. According to the equivalent circuit of current transformer, the mechanism of current transformer saturation due to GIC is discussed. Then based on the characteristics of GIC, simulation models are developed in PSCAD/EMTDC, where low frequency sinusoidal currents are adopted to emulate GIC. Simulations are conducted to analyze current transformer transient saturation and partial transient saturation, the results of which demonstrate that effects of GIC may result in mal-operation of transformer differential protection, and should be given prompt attention. © right.
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页码：84 / 89
页数：5
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