Aims
Knowledge and Understanding
Having successfully completed this module, you will be able to demonstrate knowledge and understanding of:
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exposure to a range of insulation materials and composites used in HV insulation systems and their electrical properties
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different requirements and compromised decision in practice when selecting insulation materials
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communication and presentation skills
Subject Specific Intellectual
Having successfully completed this module, you will be able to:
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learn a comprehensive range of testing and measurement techniques to characterise insulation materials
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acquire knowledge of electric field modelling and electric field control
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acquire knowledge of partial discharges, condition monitoring and insulation quality assessment
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expose to frontier research activities in high voltage insulation
Subject Specific Practical
Having successfully completed this module, you will be able to:
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design insulation system according to IEC standards
Insulation System Design, Electrical Breakdown and Materials (8 Lectures)
Review of electrical insulating materials, properties, composites, use in HV equipment, partial discharges, material ageing, surface and bulk breakdown processes. Cable, transformer, capacitors and Bushing Insulation design and stress control.
HV Testing and Measurement Techniques (6 Lectures)
International, BSI and IEEE Standards. Partial discharge, capacitance tan delta, withstand, lightening impulse etc. Material based of current IEC standards. Condition monitoring and assessment of HV insulation systems.
Research Issues (6 lectures)
Solid Insulation: Electrical treeing and short-term breakdown processes, test geometries, environmental factors. Short term breakdown tests. Condition assessment, partial discharge detection and characterisation.
Liquid Insulation: Discharges in oil, DGA and degradation of transformer oil.
Gas Insulation: Production of corona, plasma, problems and applications
Electrical Field Control and Insulation Design (4 lectures)
Bushing design
Cable insulation design
Assessment methods
Method | Hours | Percentage contribution |
275 kV Bushing Insulation Design - Students work in groups to design 275 kV bushing based on materials and dimensions provided using one of the two electric field grading methods. The electric field at crucial regions needs to be simulated using available software. Assessment based on the electric field, PD inception voltage and flashover voltage should be made on the bushing. | - | 60% |
Partial discharges and clsssifcation - In this work the students work in paris. They are required to do 10 minutes oral presentation on PD and PD classification/identification. They are also required to write a program that can identify PD type from an unknown data obtained from HV laboratory. | - | 40% |
Referral Method: By set coursework assignment(s)