Three-phase short-circuit analysis, short-circuit current calculation, selection and calibration of high and low voltage equipment, transformer relay protection, substation II. Factory power supply and distribution, load calculation, short circuit calculation, lightning protection and grounding summary this graduation. Description of Contents Chapter 1 Mine Power Supply System Section 1 Overview Section 2 Wiring and Operation Mode of Power Lines Section 3 Main Wiring of Substation Section 4 Mine Power Supply System Chapter 2 Load Calculation of Power Supply and Distribution System and Transformer Selection Section 1 Overview. In this design, in the high-voltage power supply and distribution of the factory, two transformers are selected to operate normally due to the secondary load. 29 panzhihua university Undergraduate Graduation Design (Thesis) Conclusion By completing the power supply and distribution system of a mine in Panzhihua Iron and Steel Company. Section IV Mine Power Supply System Chapter II Load Calculation and Transformer Selection of Power Supply and Distribution System Section I Overview Section II Load Calculation Section III Power Factor Improvement Section IV Transformer Selection Chapter III Short-circuit Current and Calculation Section I Overview. "Mine Power Supply" is one of the teaching materials for secondary vocational education of mine mechanical and electrical specialty. It systematically and comprehensively introduces mine power supply technology, including mine power supply system, load calculation of power supply and distribution system, transformer selection, short-circuit current calculation and power supply and distribution.