Publisher by : I. International Pvt Ltd Format Available : PDF, ePub, Mobi Total Read : 68 Total Download : File Size : 41,7 Mb Description : With energy resources becoming scarce and costly, and electrical energy being the most sought after form of energy, The designers of electrical systems are faced with the challenge of guaranteeing energy efficiency, quality and scheduling To The satisfaction of the corporate customers. This demands that the electrical systems designers to be more versatile and more effective managers of energy resources. This data handbook is intended to be used as design assistance To The beginners in the field of Electrical Systems design and provides them an easy access To The relevant data required for their design without having to waste their time and energy in searching For The required data to be used in the design problem. This design data handbook is not intended for specialists in the field, but rather For The students of Electrical Engineering who are just entering the field of electrical systems design.
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The most common B design has normal starting torque, starting current, breakdown torque, and full load slip. As can be expressed, the starting torque exerted by an induction motor started on full voltage exceeds the starting torque of one started on reduced voltage. In fact, that torque is proportional to the square of the applied voltage.
Reduced starting voltage lower starting current, but it also increases the time needed for the motor to accelerate because of reduced starting torque. A motor that can operate continuously within the temperature limits of its insulation system after it has reached normal operating temperature equilibrium is rated as continuous duty.
A motor that never reaches equilibrium temperature and must be shut down to cool periodically is rated as intermittent duty. Fractional horse power AC motor frame sizes are 42, 48, and 56 and integrated horse power AC motor frame sizes are to Motor Horsepower A measure of the rate of work equal to lifting 33, lb to a height of 1 ft per 1 minute.
One horsepower equals W. For motors it is a function of torque and speed. Ambient Temperature: The temperature of the air surrounding the motor. A counter mounted cooktop and not more than two wall mounted ovens all supplied from the same branch circuit may be considered as a single unit for the purpose of load estimation based on the following rule.
The following example illustrate the procedure: Example: Determine the estimated branch circuit demand load for the following household electric cooking equipment. Each of these units is supplied from an individual branch circuit.
Electrical Systems Design
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Theodore R Bosela