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                   NOTHING IS IMPOSSIBLE

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SELECTION OF MOTORS FOR DIFFERENT DUTY CYCLES

   SELECTION OF MOTORS FOR DIFFERENT DUTY CYCLES : 1. Continuous duty cycle :                          It denotes the motor operation at a constant load torque to reach steady state temperature. The load time and. temperature time graph are shown in fig 1.1 EXAMPLES :               Paper mill drives compressors, conveyers, centrifugal pumps and fans                                              fig. 1.1 2. Short time duty :                   It denotes the operation of motor at constant load for short period followed by rest to cool down to the original starting temperature. Short time duty timings are generally 10, 30, 60 and 90 minutes. The load time and the temperature time graph are shown in fig 1.2  EXAMPLES :               Crane drivers, drives for household appliances, sluice gate drives, valve drives and machine tool drives                                              fig 1.2 4. Intermittent period duty with starting :
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single bus bar and single busbar with sectionalisation

                                            BUS BAR 1.                               SINGLE BUS BAR                 In this way, only one set bus - bar is attached to the entire generating station.  All transformers, generators and feeders are connected to this single bus - bar.  Generators are connected to the bus - bar via isolator and circuit breakers.  Similarly to incoming and outgoing feeders via isolator and circuit breakers are attached with bus bar. This system will suitable for both A.C and D.C ADVANTAGES:                         1.  Only one circuit breaker is required for each                              outgoing circuit.  So it's simple and cost effective.              2.  Since there are no transfer circuit breakers and                        disconnectors, the operation is simple              3.  The number of circuit breakers required is low.                        So the cost of maintenance is low.              4.  The potentia
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ELECTRICAL TRACTION

                              ELECTRICAL TRACTION : ELECTRIC TRACTION :            Electric traction means a locomotion in which the driving force is derived from electric motors.  There are many advantages of electric traction over other forms of jocomotion in the current days of traction in any country of development.  In fact, it is a fast-paced, safest and economical way of transporting and transporting goods to the modern day. In this type of drive the locomotive is equiped with a d.c series motor or ac series motor or three phase induction motor. The electric energy is directly fed into the motor and torque developed by the propelling the train.                             TRACTION SYSTEMS : The most commonly used traction methods are as follows. 1.  Steam engine drive  2. Internal combustion engine drive  3. Battery electric drive  4. Internal combustion engine electric drive  5. Electric drive               IDEAL TRACTION SYSTEM OF REQUIREMENTS : 1.The u
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