Electrical Insulations and Discharges
A tantárgyleírás hatályossága
| Subject name (Hungarian, English) |
Villamos szigetelések és kisülések
Electrical Insulations and Discharges
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| Subject code | BMEVIVEMA19 | ||||||||||||
| Subject type | — | ||||||||||||
| Training Level | — | ||||||||||||
| Course types and hours (weekly/semester) |
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| Assessment type | vizsga | ||||||||||||
| Credits | 5 | ||||||||||||
| Subject coordinator |
DR. Tamus Zoltán Ádám
position: egyetemi docens
contact:
tamus.adam@vik.bme.hu
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| Responsible department |
Villamos Energetika Tanszék
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| Faculty | Villamosmérnöki és Informatikai Kar | ||||||||||||
| Subject website | — | ||||||||||||
| Primary curriculum type | — | ||||||||||||
| Direct prerequisites – Strong prerequisite | none | ||||||||||||
| Direct prerequisites – Weak prerequisite | none | ||||||||||||
| Direct prerequisites – Parallel prerequisite | none | ||||||||||||
| Direct prerequisites – Milestone prerequisite | none | ||||||||||||
| Direct prerequisites – Exclusion | none |
Objectives
Basics of electrical insulation technology, basic types of insulation and breakdown. Insulation problems in electrical engineering.
Insulating materials in the electric field, layered insulations, dielectric refraction and its role in insulations, stress control solutions. Composite insulation materials
Dielectric polarisation: the relationship between field quantities and charges. Macro and micro characteristics of polarisation. Polarizability.
Elementary polarisation processes I: Electron polarisation and its models. The Clausius-Mossotti relation. Ion polarisation
Elementary polarisation processes II: Orientation polarisation and ion hopping polarisation
Dielectric response function and its characteristics in the time and frequency domain.
Measurement of the dielectric response in time and frequency domains using current and voltage measurements. Relationship between dielectric response and insulation condition
Electric discharges in gases (collisions, photo- and thermal ionisation, laws of electric arc). Physical processes producing and consuming charge carriers.
Partial discharges: corona discharges (electron avalanche, plasma discharge, channel discharge), cavity discharges, creep discharges, and lightning discharges. Breakdown: flashover and spillover, spark discharge, electric arc.
Electrostatic discharges (suppressed spark discharges, propagating discharges, discharges on the surface of a layer of deposited dust). Detrimental effects of discharges (fires, explosions, ESD). Industrial applications of discharges.
Development of flashover processes in insulating liquids. Breakdown of pure and commercial liquids.
Electrical strength breakdown in solid insulating materials. Electrical breakdown cases: intrinsic breakdown, electromechanical breakdown, thermal breakdown, electrical ageing
Statistical theory of breakdown, effect of stress and duration on dielectric strength
Practices:
Calculation of electric fields, electric fields of layered structures, dimensioning of insulations
Calculation of dielectric constants of rare gases in different models (electronic polarisation), application of the Clausius-Mossotti relation
The dielectric constant of ionic crystalline materials, optical range and low frequency. Determination of the time constant of ion polarisation
Determination of the electrical model of insulations, interpretation of the dielectric response function based on measurement results
Analytical modelling of gas breakdown, calculation of Paschen curve for noble gases
Calculation of discharge energy and interpretation of measurement results.
Investigation of electrostatic charging and the different factors of charging on typical arrangements
Learning outcomes
Ez a tantárgy a KKK rendeletben meghatározott, következő kompetenciák fejlesztését szolgálja:
Knowledge
No learning outcomes recorded.
Skills
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Attitudes
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Autonomy and responsibility
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Oktatási módszertan
Tanulástámogató anyagok
Online források
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In-term assessments
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