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Design of a SF6 Load Breaker Switch for Compact Distribution Substation

Akbari, Mohammad | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47476 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Vakilian, Mehdi
  7. Abstract:
  8. Electrical energy customer and load growth on the one hand and the problems of allocation of land for the development of the power networks on the other hand, make the tendency to use less space in the electrical industries. One of the solutions used in power distribution networks, especially in crowded areas is compact substation which requires less space than ordinary substations and also the prefabricated types of this substation can be used in the distribution system. In a compact distribution substation, all components must be designed with a minimum size. Therefore, the insulation system of the compact substation should be designed based on these requirements.
    In the distribution system applications, under most cases the installation of the circuit breaker as a fast switch is not necessary, so load break switch (LBS) is employed. LBS should act as a disconnecting switch (isolation and reliable disconnecting) while it should be able also to break small electrical current (load current) like circuit breaker. So LBS’s must be able to extinguish the arc in compared with sectioners. The best way to quench the arc and decrease the isolation distance is the application of SF6 gas as the arc quenching medium. Therefore, SF6 gas helps us to have a smaller LBS. This property provides a major advantage to design a compact distribution substation.
    In this thesis, a LBS with SF6 gas medium (to be used in a compact distribution substation) is designed. In the early chapters different types of switches and switching operation principles, compact substations, SF6 gas properties and numerical solution methods are explained. To address the requirements of the standards on the tests of the switches, in the thesis the followings are discussed: Electrical Field and the Internal Insulation Design of Switch, Electromagnetic Forces and Design of Mechanical Strength and Switch Thermal Calculations and Analysis. The LBS analysis is carried out, a sample is designed, and finally this design is optimized
  9. Keywords:
  10. Numerical Method ; Numerical Solution ; Insulation Design ; Electrical Field ; Load Break Switch ; Compact Distribution Substation ; Thermal Considerations ; Short Circuit Forces ; Mechanical Strength

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