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12th Annual Meeting of China Association for Science and Technology on Information and Communication Technology and Smart Grid (AMCST 2010 E-BOOK)

Fuzhou,China,11.1-11.3，2010

ISBN: 978-1-935068-23-5 Scientific Research Publishing, USA

E-Book 660pp Pub. Date: November 2010

Category: Computer Science & Communications

Price: $120

Title: Analysis to a Transformer Protection Event
Source: 12th Annual Meeting of China Association for Science and Technology on Information and Communication Technology and Smart Grid (AMCST 2010 E-BOOK) (pp 18-20)
Author(s): Jun-yi Zhai, Pingdingshan Power Supply Company, Pingdingshan, Henan, China 467001
Li-wei Duan, Pingdingshan Power Supply Company, Pingdingshan, Henan, China 467001
Shi-min Du, Pingdingshan Power Supply Company, Pingdingshan, Henan, China 467001
Ling-ling Cao, Pingdingshan Power Supply Company, Pingdingshan, Henan, China 467001
Abstract: This paper carried out a detailed experimental analysis to related switches and protective devices of typical leapfrog tripping accident of power grid, found out the reason that failures to operate of compound voltage lockout over-current protection of transformer medium-low-voltage side, that the protection could not accurately provide logical conditions of compound voltage when breakdown occurred, and put forward concrete solutions that delayed widening 5~10s should be increased in logical conditions of start-up circuit of compound voltage at medium-low-voltage side in order to guarantee high backup protection can operate reliably. This paper has a certain reference value for preventing accidents recurrence and increasing reliability of protective devices.
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