METHODS OF STARTING OF SYNCHRONOUS MOTOR
(1) By using a starting motor. This motor is directly coupled to the motor. It may be an induction motor…
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USES OF DC GENERATORS
1. Shunt generators with field regulators are used for ordinary lighting and power supply purposes. They are also used for…
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CHARACTERISTICS OF DC GENERATOR
Following are the three most important characteristics or curves of a dc generator: 1. No-load saturation Characteristic (E0/If): It is…
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AUTO TRANSFORMER TAP CHANGING
Figure shows diagrammatically auto-transformer tap changing. Here, a mid-tapped auto-transformer or reactor is used. One of the lines is connected…
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TAP CHANGING TRANSFORMERS
The excitation control method is satisfactory only for relatively short lines. However, it is not suitable for long lines as…
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TRANSFORMER EXTERNAL FAULTS
External faults are those faults or hazards that occur outside the transformer. These hazards present stresses on the transformer that…
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THREE PHASE TRANSFORMER WINDING CONNECTIONS
A three-phase transformer bank can be easily created by using three single-phase transformers. The two sides of these three transformers…
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PROPERTIES OF TRANSFORMER OIL
Even though the basic functions of the oil used in transformers are (a) heat conduction and (b) electrical insulation, there…
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THERMAL AND VOLTAGE CONSIDERATIONS OF PRACTICAL TRANSFORMER
THERMAL CONSIDERATIONS The losses in the windings and the core cause temperature rises in the materials. This is another important…
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THREE PHASE TRANSFORMER WINDING CONNECTIONS
1) DELTA DELTA CONNECTION 1. Suitable for both un-grounded and effectively grounded sources. 2. Suitable for a three-wire service or…