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Energy Conservation in Electrical Drives

Energy Conservation in Electrical Drives: Application of Variable Speed Drives : Several drives are driven at constant speeds by induction or synchronous motors, although operation of Application of Variable Speed Drives could lead to saving of substantial amount of energy. Such practice was adapted in the past because of nonavailability of efficient methods of speed control …

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Conventional DC and AC Traction Drives

Conventional DC and AC Traction Drives: The commonly used Conventional DC and AC Traction Drives are The dc Traction Drives Employing Resistance Control: The dc traction drives employing resistance control are: 1500 V dc traction on Bombay-Igatpuri-Pune section for main line and Bombay suburban 750 V dc traction in underground trains at Calcutta. 550 V …

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Features of Traction Drives

Features of Traction Drives: Various Features of Traction Drives are: 1. Large torque is required during start and acceleration in order to accelerate the heavy mass. 2. The motor is subjected to torque overloads during acceleration and when negotiating up gradients. 3. Because of economic reasons single phase supply is used in ac traction. Indian …

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Dynamics of Electrical Drives

Dynamics of Electrical Drives: Classification of Load Torques : As we know already, the nature of Classification of Load Torques depends on particular application. A low speed hoist is an example of a load where the torque is constant and independent of the speed (Fig. 2.3). At low speeds, windage torque is negligible. Therefore, net …

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Dynamic Electric in Electric Drives

Dynamic Electric in Electric Drives: Basic Elements of Electric Drive : Basic Elements of Electric Drive- Before discussion makes clear that an electric drive system basically consists of a mechanical load to which the required mechanical motion is imparted through a transmission drive usually equipped with gears or pulleys. Gearless transmission is possible sometimes, in …

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Transmission Line Overvoltage Protection

Transmission Line Overvoltage Protection: Transmission Line Overvoltage Protection against natural or lightning overvoltages and minimizing the lightning overvoltages are done by suitable line designs, providing guard and ground wires, and using surge diverters. Switching surges and power frequency overvoltages are accounted for by providing greater insulation levels and with proper insulation co-ordination. Protection against Lightning …

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Applications of Electric Drives

Applications of Electric Drives: The industrial Applications of Electric Drives are numerous. To arrive at a particular motor of suitable size for a given application, a knowledge of the following is very much necessary: The torque-speed curve of the industrial load is required. This fixes up the type of motor required to drive the load. …

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