Identify the operating principle of a power Describe the construction of different types of Tariff for a given installation and set of circumstances. Power rating of a capacitor to improve power factor of a load, location of power factor correctionĬapacitors, efficient control of heating and lighting systems, recycling heat from heating and lightingĬost of energy: cost of running a system using the different tariffs available, selection of appropriate Tariff structures: domestic, Domestic Economy, Domestic Smart, business (eg Economy all-purpose,Įconomy combined premises, evening and weekend), restricted hour, methods of controllingĮnergy consumption: load scheduling, power factor correction techniques, calculation of apparent Speed control: change of stator voltage and frequency Starting methods: direct on-line, stator voltage reduction, rotor resistance method On rotor resistance and reactance torque equations for a three-phase induction motor torque/speedĬharacteristics, stator and rotor losses, efficiency calculations Resistance, reactance, and induced voltage standstill conditions slip speed the effect of rotor speed Operating principles: production of a rotating magnetic field in the stator synchronous speed rotor Type: single cage, double cage, wound rotor Parks small supermarket administration office of a college, including computer stations.Ĥ. Light scheme: produce a scheme for one of the following developments or equivalent, given theĪppropriate plans: small commercial development to involve roads, tunnel, pedestrian areas and car Interior lighting design codes, lighting for visual tasks, emergency lighting Lighting design: quality of light, control of glare, luminance distribution, consistency of lighting levels, Of earth fault relays and residual current circuit breaker, position in circuit, calculation of ‘time to clear’Ĭommon lamp types: low pressure mercury, high pressure mercury, low pressure sodium, high Operating principles: characteristics and circuit positions of over-current relays, high rupture capacityįuse, and miniature circuit breaker, calculations of ‘time to clear’ over-current faults, discriminationsĮarth fault protection devices: basic construction of earth fault relay and residual current circuitīreaker, performance requirements of earth fault protection, principle of operation and characteristics Rupture capacity fuse, overcurrent relay and miniature circuit breaker Over-current protection devices: basic construction of oil, vacuum and airblast circuit breakers, high Regulation, losses on load, efficiency of transformer, calculation of efficiency under load conditions,Įffects of load changes on losses, load conditions for maximum efficiency, calculation of maximumĬonnections: star-stare, delta-star, delta-zigzag Transformer, voltage regulation, approximate formula for voltage regulation, calculation of voltage Operating principles: derive the equivalent circuit for an ideal transformer on load, phasor diagram forĪn ideal transformer on load, identify the no-load losses, derive the equivalent circuit to represent noload losses, leakage reactance, winding impedance, derive the complete equivalent circuit,Ĭomponents of the equivalent circuit referred to one winding, phasor diagram for the loaded
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