Transformer Differential Protection Applications of the Applicant Electronic Current Transformer

Abstract:

This paper mainly analyses, improvement and experiment using the device of Wuhan Hua gong Electric Automation Co., Ltd. existing. As a comparison, this paper firstly analyzes the measuring principle of electromagnetic current transformer and the saturation problem, coil measurement principle and error, a brief summary of the distinction between the two. One time, two times of converter and the merging unit as part of electronic current transformer, this paper also made some analysis. Then analyzed some improvement of transformer differential protection of electronic current transformer based on improved. Firstly, the hardware protection data interface part of, through the analysis of the reasonable selection, then it is based on transformer differential protection of electronic current transformer, the two line ratio braking curve formulation through the analysis of unbalanced current sources, make do with electromagnetic current transformer current unbalance and the ratio braking curve based on the comparative analysis. Finally, the relay protection software the program is changed the basic function of the device is tested, the test results showed that the improved protection device.

• Periodical: Applied Mechanics and Materials (Volumes 644-650)
• Pages: 3818-3820
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.644-650.3818
• Online since: September 2014
• Authors: Li Xue Mei*
• Keywords: Electronic Current Transformer (ECT), Magnetic Current Transformer, Power System, Solution, Synchronic Sampling Method

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