Industrial Power Engineering and Applications Handbook by KC Agrawal

By KC Agrawal

By no means ahead of has loads flooring been lined in one quantity reference resource. This five-part paintings is bound to be of serious price to scholars, technicians and practising engineers in addition to apparatus designers and brands, and will develop into their one-stop store for all info wishes during this topic area.This ebook can be of curiosity to these operating with: Static Drives, Static Controls of electrical automobiles, velocity regulate of electrical vehicles, tender beginning, Fluid Coupling, Wind turbines, turbines, portray techniques, Effluent therapy, Electrostatic portray, Liquid portray, software Transformers, middle Balanced CTs, CTs, VTs, present Transformers, Voltage Transformers, Earthquake engineering, Seismic trying out, Seismic results, Cabling, Circuit Breakers, Switching Surges, Insulation Coordination, Surge defense, Lightning, Over-voltages, flooring Fault Protections, Earthing, Earth fault safeguard, Shunt Capacitors, Reactive regulate, Bus structures, Bus Duct, & emerging mains

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For still higher ratings, HT motors should be used. 17. The legends to represent these mountings are given below: 1 Floor mounting 2 3 4 5 6 7 8 9 10 Wall mounting Ceiling mounting Wall mounting Wall mounting Flange mounting Flange mounting Flange mounting Foot-cum-flange mounting Foot-cum-flanges on both sides B3 B6fB7 B8 v5 V6 B5 v1 v3 B3fB5 B17 Nore For brevity, the prefix IM, representing ‘International Mounting’, has been omitted from thcsc legends. In common practice the different types of mountings are represented as noted above.

For one or more of the following reasons: 1 To contain the start-up inrush current, as a result of low start-up impedance and to control the same as needed through external resistance in the rotor circuit. 2 To provide a smoother start. 3 To meet the requirement of a high start-up torque and yet contain the start-up inrush current. The latest trend, however, is to select only squirrel cage motors as far as practicable and yet fulfil most of the above load requirements. Fluid couplings and static (IGBT or thyristor) drives can meet the above requirements by starting at no load or light load and controlling the speed as desired, besides undertaking energy conservation.

The main flux, thus cutting the copper coil (ring), induces a current in the ring. The current in the copper ring opposes the main flux in that area of the pole and behaves like an artificial second winding, and develops a rotating field. Although the torque so developed is extremely low, it is enough to rotate such small drives, requiring an extremely low starting torque, of the order of 40-50% of the full load torque. Theory, performance and constructional features of induction motors 1/29 Vr(1-4) 0- Im -0 Centrifugal switch opens here Main winding Disconnect switch t Start hnding XL > XL, Note Phase shift is obtained by increasing R XL1 - 3 P COT, (a) Schematic diagram Tsi I Speed Nr ---+ 7585% N, (d) Speed-torque characteristics of a split phase motor "1 1 ; I,",.

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