Download Assistant Engineer Electrical (Level-6)

Internal-6, Ass. Eng-(Ele) 261/ 063.1.19
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1.
FUNDAMENTALS
 Role of resistance, inductance and capacitance in electric circuits.
 Series and parallel connection of resistance, inductance and capacitance.
 Ohm’s law and Kirchhof’s law, Electric power and energy.
 Alternating current fundamentals: Principle of generation of alternating voltages
and currents and their equations and waveforms, average, peak and rms values,
A.C. through resistance, inductance, capacitance and through their combinations,
active and reactive power
 Three phase AC systems: Principle of three phase AC generation, star delta
connection, three phase three wire and three phase four wire systems
2.
POWER PLANTS
 Hydroelectric power plants: Merits and demerits, classifications and respective
layouts, selection of sites, types of water turbines, their working principles and
applications, governing of water turbines, Hydro-plant auxiliaries.
 Diesel electric power plants: Merits and demerits, selection of sites, elements of a
diesel plant and its layout.
 Non conventional power generation: Photo voltaic or solar cells, solar power
generation, wind power generation.
3.
ELECTRICAL MACHINES
 D.C. generators: Working principle, types of D.C. generators, losses and
efficiency, application of series, shunt and compound generators.
 D.C. motors: Working principle, types of D.C. motors, applications of D.C. series
and shunt motors, losses and efficiency, speed control, starters.
 Synchronous generator: Construction and working principle, equation of induced
E.M.F., voltage and frequency regulation, losses and efficiency, parallel operation
and synchronizing, alternators connected to infinite bus bars, different types of
excitation systems, drying of alternators.
Internal-6, Ass. Eng-(Ele) 261/ 063.1.19
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Synchronous motors: Working principle, application, starting.
Three phase induction motors: Construction and working principle, types, starting
and speed control, applications.
Transformers: Construction, working principle, voltage regulation, losses and
efficiency, parallel operation, oil test, role of transformer oil, cooling of
transformers, Bucholtz protection, three phase transformer connection.
Prerequisites for starting of generators in hydro and diesel station.
Necessity of cooling in power stations
Role of auxiliary equipments in power stations, storage batteries, their capacities,
charging and maintenance.
Necessity of black start units in power stations.
4.
CONTROL AND PROTECTION
 Necessity of D.C. system in power stations.
 Working principle and construction of vacuum and gas filled circuit breakers,
specification, rating, testing and selection of circuit breakers.
 Over current, earth fault and under voltage relays, isolators and contactors
 Overload and short circuit protection, earth fault protection, differential
protection, distance protection.
 Instrument transformers and their role in system protection.
 Power line carrier communication and its importance.
 Surge arrestor and its importance in protection against lightening.
5.
SUB-STATION AND TRANSMISSION LINE
 Substations: Equipments used in substations, general layout of substation, bus bar
arrangements, earthing of equipments in a substation.
 Transmission lines: Overhead transmission line and under ground cabling,
necessity of high voltage transmission, choice of voltage level, conductor
spacing, voltage regulation and efficiency of short and medium transmission lines,
sag, tension and clearances, supports and cross arms, insulating materials and their
classification, conducting materials, vibrations and dampers in transmission lines,
live line maintenance.
 Lightening phenomenon, types and functions of lightening arrestor, over head
earth wire.
6.
DISTRIBUTION AND CONSUMER SERVICE
 Primary distribution system: Radial system, ring main system and interconnected
network system
 Secondary distribution system: Three phase four wire distribution, single phase
two wire distribution
 Voltage regulation
 Selection of supports and conductors in secondary distribution system
 Earthing of electrical system and equipment
 Consumer supply connection
 Fuse, MCB and MCCB protection
 Consumer supply energy meters: Construction and principle of operation,
creeping errors and their compensation, testing of energy meters
Internal-6, Ass. Eng-(Ele) 261/ 063.1.19
7.
POWER SYSTEM OPERATION AND MAINTENANCE
 Concept of demand factor, diversity factor, load factor and load curves, load
duration curves, power factor correction and improvement
 Operation of substation during normal and abnormal condition
 Synchronizing and system restoration
 Preventive maintenance in electrical system for transmission lines and its
equipment, distribution lines and its equipments, transformers, switchgears,
motors, generators, turbines excitation system, and communication system used
in power system
 Maintenance of D.C. system
 Safety and precautions, safety rules and regulation, safety tools and devices.
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(1)
GENERAL:
History of power development in Nepal; hydro power potential; energy supply
demand trends; challenges and prospects of hydropower development; Hydropower
development policy, 2058; Role of HMG institutions; NEA and private sectors in
power development; NEA organizational structure and functions of different business
groups; understanding of performance contract.
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