Different Groups of Systems of Electric Traction: As already mentioned, systems of electric traction may be divided into two main groups. (1) The group consisting of vehicles which receive electric power from a distributing network fed at suitable points from either a central power station or substations suitably spaced. This group is further subdivided into: […]
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Different Types of Traction System: The various types of traction system commonly used are described below. 1. Direct Steam Engine Drive. The steam engine drive used to be widely employed for railway work. In this types of traction System drive, the reciprocating steam engine is invariably used for getting the necessary motive power because of
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Systems of Track Electrification AC Electrification System: As even in single phase electrification, the substations are necessarily required to keep the voltage drop within permissible limits. The type of substations required depends upon the nature of primary supply and system of AC electrification system. High Voltage AC Supply Arrangements of power supply to the various
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Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 12: 552. The electric motor used for traction work should be mechanically (a) small in overall dimensions (specially in its overall diameter). (b) light in weight and robust in construction. (c) capable to withstand continuous vibrations. (d) all of the above. Answer : (d) all
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Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 3: 102. The most suitable motor for a steel mill requiring a motor having high starting torque, wide speed range and precise speed control is (a) plain squirrel cage induction motor. (b) wound rotor induction motor. (c) dc series motor. (d) dc shunt motor. Answer
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Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 1: 1. The basic elements of an electric drive are : (a) electric motor and the transmission system. (b) electric motor, the transmission and control system. (c) the transmission and control system. (d) electric motor and conversion equipment. Answer : (b) electric motor, the transmission
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Electrical Power Engineering Interview Questions and Answers: AC Distribution Interview Questions and Answers Braking and Mechanical Considerations Interview Questions and Answers Bus Bar Protection Interview Questions and Answers Circuit Breakers Interview Questions and Answers Circuit Breaking Interview Questions and Answers Cogeneration and Energy Conservation Interview Questions and Answers Combined Operation of Power Plants Interview Questions
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Power Converters Interview Questions and Answers: 1. What is freewheeling diode? Ans. Freewheeling diode is a bypass or commutating diode. It is connected across motor terminals to allow for dissipation of energy stored in motor inductance and to provide for continuity of motor current when the thyristors are blocked. It also provides protection against transient overvoltages.
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Single Phase Full Wave Controlled Rectifier (or Converter): In case of Single Phase Full Wave Controlled Rectifier (or Converter) both positive and negative halves of ac supply are used and, therefore, the effective value of dc voltage is high and ripple content is less compared to half-wave rectifiers. There are two basic configurations of Single
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What is a Power Converter? Solid-state power converter are employed for obtaining the appropriate form of electrical energy such as direct current or adjustable-frequency alternating current (required to operate most electronic circuits and motor drives) from fixed-frequency alternating current. Types of Power Converters: AC to DC converters : AC to DC converters convert alternating current
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