High Voltage Engineering - [2160904]

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Teaching Scheme

Theory
Tutorial Practical Total
3 0 2 5

Examination Scheme

Theory Examination Practical Examination Total
ESE (E) PA (M) ESE Viva (V) PA (I)
- - - - -

    ESE = End Semester Examination, PA = Progressive Assessment


Semester   
:   
6
Course Type   
:   
-
Credit   
:   
5

Syllabus Content

Electrical field distribution and breakdown strength of insulating materials - fields in homogeneous, isotropic materials - fields in multi-dielectric, isotropic materials - numerical method: Finite Difference Method (FDM), Finite Element Method (FEM), charge simulation method (CSM)
Gases as insulating media - ionization and decay processes, Townsend first ionization coefficient, photoionization, ionization by interaction of metastable with atoms, thermal ionization, deionization by recombination, deionization by attachment–negative ion formation, mobility of gaseous ions and deionization by diffusion, relation between diffusion and mobility, examples - cathode processes – secondary effects, photoelectric emission, electron emission by positive ion and excited atom impact, thermionic emission, field emission, Townsend second ionization coefficient, secondary electron emission by photon impact, examples - transition from non-self-sustained discharges to breakdown, the Townsend mechanism, examples - the streamer or ‘kanal’ mechanism of spark, examples - the sparking voltage– Paschen’s law, penning effect, the breakdown field strength, breakdown in non-uniform fields - effect of electron attachment on the breakdown criteria, partial breakdown, corona di
Liquid as insulators, breakdown in liquids - electronic breakdown, suspended solid particle mechanism, cavity breakdown, electroconvection and electro-hydrodynamic model of dielectric breakdown, examples -static electrification in power transformers, transformer oil filtration, transformer oil test, alternative liquid insulations like vegetable oils, esters and silicon oils - breakdown in solids, intrinsic breakdown, streamer breakdown, electromechanical breakdown, edge breakdown and treeing, thermal breakdown, erosion breakdown, tracking - breakdown of solid dielectrics in practice, partial discharges in solid insulation, solid dielectrics used in practice
Generation of high direct voltages, half and full wave rectifier circuits, voltage multiplier circuits, Van de Graff generators, electrostatic generators, examples - generation of alternating voltages, testing transformers, cascaded transformers, resonant transformers, examples - impulse voltages, Standard lightning and switching surge and associated parameters and their corrections, impulse voltage generator circuits, Marx circuit, operation, design and construction of impulse generators, examples - impulse current generator - control systems
High direct voltage measurement, peak voltage measurements by spark gaps, sphere gaps, reference measuring systems, uniform field gaps, rod gaps, factors affecting sphere gap measurements, examples - electrostatic voltmeters - ammeter in series with high ohmic resistors and high ohmic resistor voltage dividers - generating voltmeters and field sensors - the measurement of peak voltages, the Chubb–Fortescue method, highvoltage capacitors for measuring circuits - voltage dividing systems and impulse voltage measurements, generalized voltage generation and measuring circuit, voltage dividers, interaction between voltage divider and its lead, the divider’s low-voltage arm - digital recorders, errors inherent in digital recorders
The lightning mechanism, energy in lightning, nature of danger - simulated lightning surges for testing - switching surge test voltage characteristics - laboratory high-voltage testing procedures and statistical treatment of results, examples - insulation coordination, insulation level, statistical approach to insulation coordination, correlation between insulation and protection levels - modern power systems protection devices, M O A – metal oxide arresters
Measurement of d.c. resistivity - dielectric loss and capacitance measurements, the Schering bridge, current comparator bridges, loss measurement on complete equipment, null detectors - partialdischarge (PD) measurements, the basic PD test circuit, PD currents, PD measuring systems within the PD test circuit, measuring systems for apparent charge, sources and reduction of disturbances, other PD quantities, calibration of PD detectors in a complete test circuit, digital PD instruments
Testing of insulators and bushings, testing of isolators and circuit breakers Testing of cables, testing of transformers - testing of surge diverters - radio interference measurements - design, planning and layout of high voltage laboratory

Reference Books

SrTitleAuthorPublicationAmazon Link
1High Voltage Engineering: FundamentalsKuffel, E., Zaengl W.S., Kuffel JA division of Reed Educational & Profession Publis
2High Voltage EngineeringNaidu M. S. and Kamaraju VTata McGraw- Hill   
3High Voltage Engineering, Problems and SolutionsRakosh Das BegamudreNew Age International Publishers   
4High Voltage Engineering-Theory and PracticeM. KhalifaMarcel Dekker   

Course Outcome

After learning the course the students should be able to

  • Understand the basic generation and measurement of High voltage and High current for testing purposes
  • Comprehend Breakdown phenomenon in air, solid and liquid insulation
  • Test high voltage electrical Equipment with various testing devices.