1600 kVA three-phase transformer for a complete transformer plant
Students Name: Sliusarchyk Mykola
Qualification Level: magister
Speciality: Electrical Energetics, Electrical Engineering and Electromechanics
Institute: Institute of Power Engineering and Control Systems
Mode of Study: part
Academic Year: 2022-2023 н.р.
Language of Defence: ukrainian
Abstract: Complete transformer substations in a mobile block-container building at a voltage of 35/0.4 kV are designed for receiving, transforming and distributing electrical energy of three-phase current with an industrial frequency of 50 Hz. Benefits: • minimum terms of installation, adjustment and commissioning due to full factory readiness; • increased reliability of electrical equipment; • connection of low-power consumers along the route; • 6(10) kV intermediate substations are unnecessary; • reduction of losses on long lines; • the possibility of dismantling and moving in a short time; • convenience and guaranteed safety of operation. The purpose of this master’s thesis is the design of a three-phase transformer with a capacity of 1600 kVA for a complete transformer substation. The practical value of the obtained results lies in the possibility of using them for the design, development (or modernization of existing) transformers after performing additional calculations and drawings of all nodes and details. The relevance of this master’s thesis lies in the development of a three-phase power transformer with improved technical and economic indicators due to the use of modern design methods and techniques. The design of power three-phase transformers includes a wide range of issues. The development of the transformer design is based on the performance of electromagnetic, mechanical and thermal calculations, which provide the specified basic electrical indicators and operational parameters. During construction, the required mechanical strength of nodes, electrical strength of insulation, dynamic and thermal resistance of windings during short circuit must be ensured. The 8 design of the transformer as a whole should ensure operational reliability. During the development of components and parts of the transformer, it is necessary to try to obtain the lowest consumption of materials and the lowest labor intensity of production, in order to reduce the price of the transformer to a minimum. Important operational requirements are mechanical and electrical strength, as well as resistance to heating of windings and other parts and the entire transformer. The insulation of the windings and other parts of the transformer must withstand without damage atmospheric and switching overloads that may occur in the network in which the transformer will work. The mechanical strength of the windings must guarantee their protection against damage and mechanical deformation during short-circuit currents that are hundreds of times higher than the rated current of the transformer. Heating of windings and other parts from losses occurring in the transformer during rated operation and short circuit of long duration should not lead to insulation of windings and other parts, as well as transformer oil, to thermal wear or destruction in less time than the normal life of the transformer. Keywords: complete transformer substation, power transformer, magnet wire, winding. List of used literary sources: 1. A.I. Honcharuk "Calculation and construction of transformers". – M.; "Energostanizdat", 1991. 2. Zahirnyak M. V., Nevzlin B. I. Electric machines: a textbook. — K.: Znannia, 2009. — 399 p. — ISBN 978-966-346-644-6 3. DSTU 3270-95 Power transformers. Terms and definitions. 4. DSTU 2790-94 Power supply systems with a nominal voltage of more than 1000 V: sources, networks, converters and consumers of electrical energy. Terms and definitions. 5. IEC 60076-2:1993 Power transformers – Part 2: Temperature rise. 6. IEC 60076-11:2004 Power transformers – Part 11: Dry-type transformers.