NDLI: Elimination of inrush current of transformers and distribution lines

Content Provider	IEEE Xplore Digital Library
Author	Asghar, S.J.
Copyright Year	1996
Description	Author affiliation: Dept. of Electr. Eng., Aligarh Muslim Univ., India (Asghar, S.J.)
Abstract	Repeated switching of distribution transformers take place due to poor generation and load shedding. The transformers mounted on electric locomotives are also regularly reswitched after crossing each buffer zone between two substations. The steady state magnetizing current of a transformer is about 5% of the full load current, but the transient inrush current may be as high as ten times the full-load current. The switching instant decides the nature and magnitude of the switching current and it is used here to control the inrush current. Another method is adopted by placing a capacitor at the secondary side of the unloaded transformer connected at the sending or receiving end of the distribution line. A third method is proposed using the distribution line as a low-pass filter. In the case of a three-phase transformer, when it is switched, inrush current flows in either one or two phase windings. Instead of simultaneous switching of all the phases (windings), each winding of the transformer is switched at predetermined switching instants sequentially. Thus inrush currents are contained to a steady-state level using an instant-controlled switching circuit. Switching of all phases completes within 1/3 or 1/4 of the power-cycle depending upon the mode of transformer configuration and the switching strategy. The switching current is found to be the same as the steady-state no-load current. These schemes are useful for traction transformers as well as for poorly supplied and poorly maintained distribution lines including traction lines which are subjected to repeated switching.
Starting Page	976
Ending Page	980
File Size	491828
Page Count	5
File Format	PDF
ISBN	0780327950
DOI	10.1109/PEDES.1996.536404
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-01-08
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Surges Steady-state Power system transients Capacitors Low pass filters Switching circuits Heating Power transformer insulation Production systems Stress
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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