NDLI: Analysis of Electromagnetic Transient and Adaptability of Second-Harmonic Restraint Based Differential Protection of UHV Power Transformer

Content Provider	IEEE Xplore Digital Library
Author	Xiangning Lin Jingguang Huang Linjun Zeng Bo, Z.Q.
Copyright Year	1986
Abstract	An autotransformer is used as the main type of UHV transformer, but the internal fault model of autotransformer provided by most simulation software is not available. To find out the existing problems of the application of the differential protection of UHV transformer, a three winding autotransformer model is firstly built according to the existing Unified Magnetic Equivalent Circuit transformer model provided by EMTDC software. Furthermore, the internal fault model of UHV transformer is set up. By virtue of above models, the energization and internal faults are simulated to validate the well-applied differential protection using second-harmonic blocking. It can be proven that the second-harmonic ratios of three phase inrushes of the UHV power transformer are all below 10% in some energization scenarios. In this case, the maloperation of the differential protection by means of 15%~20% second-harmonic restraint ratio cannot be avoided. On the other hand, the second-harmonic ratio of the fault current is relatively high in the beginning of fault inception for some light faults, leading to the short time delay of operation of protection. This discovery will encourage the research and development of the novel scheme of the main protection of UHV transformer.
Sponsorship	IEEE Power Engineering Society
Starting Page	2299
Ending Page	2307
Page Count	9
File Size	933418
File Format	PDF
ISSN	08858977
Volume Number	25
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electromagnetic analysis Transient analysis Protection Power transformers Circuit faults Circuit simulation Electromagnetic modeling Analytical models Application software Equivalent circuits UHV Autotransformer EMTDC harmonic inrush internal fault
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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