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Optimal Coordination of Automatic Line Switches for Distribution Systems

Department of Electrical Engineering, St. John’s University, 499, Sec. 4, Tam King Road, Tamsui District, New Taipei City 25135, Taiwan
Department of Electrical Engineering, National Taiwan University of Science and Technology, 43, Sec. 3, Keelung Road., Taipei 106, Taiwan
Author to whom correspondence should be addressed.
Energies 2012, 5(4), 1150-1174;
Received: 20 February 2012 / Revised: 31 March 2012 / Accepted: 17 April 2012 / Published: 23 April 2012
For the Taiwan Power Company (Taipower), the margins of coordination times between the lateral circuit breakers (LCB) of underground 4-way automatic line switches and the protection equipment of high voltage customers are often too small. This could lead to sympathy tripping by the feeder circuit breaker (FCB) of the distribution feeder and create difficulties in protection coordination between upstream and downstream protection equipment, identification of faults, and restoration operations. In order to solve the problem, it is necessary to reexamine the protection coordination between LCBs and high voltage customers’ protection equipment, and between LCBs and FCBs, in order to bring forth new proposals for settings and operations. This paper applies linear programming to optimize the protection coordination of protection devices, and proposes new time current curves (TCCs) for the overcurrent (CO) and low-energy overcurrent (LCO) relays used in normally open distribution systems by performing simulations in the Electrical Transient Analyzer Program (ETAP) environment. The simulation results show that the new TCCs solve the coordination problems among high voltage customer, lateral, feeder, bus-interconnection, and distribution transformer. The new proposals also satisfy the requirements of Taipower on protection coordination of the distribution feeder automation system (DFAS). Finally, the authors believe that the system configuration, operation experience, and relevant criteria mentioned in this paper may serve as valuable references for other companies or utilities when building DFAS of their own. View Full-Text
Keywords: distribution feeder automation system; protection coordination; underground 4-way automatic line switch distribution feeder automation system; protection coordination; underground 4-way automatic line switch
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Yang, M.-T.; Gu, J.-C. Optimal Coordination of Automatic Line Switches for Distribution Systems. Energies 2012, 5, 1150-1174.

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