By Jeffrey J. Keljik
Up to date to the 2011 nationwide electric Code, electrical energy three: strength iteration AND supply, 10E explores a variety of different types of turbines and the supply of unmarried part and three-phase strength to the client website. Its thorough insurance of energy iteration and supply comprises issues akin to DC turbines, polyphase circuits, three-phase wye and delta connections, electric features of three-phase alternators, substitute strength resources, transformers, and extra. a great source for either beginner and working towards electric staff, electrical energy three emphasizes electric procedure operation, giving readers a high-quality knowing of electric systems and the way to use them whereas troubleshooting.
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Extra resources for Electricity 3 : power generation and delivery
The points (1-23-4-5-6) are displaced 60 electrical degrees apart from one another. TWO-PHASE CONNECTIONS In a two-phase connection (Figure 7-8), the windings are spaced 90° apart. Lines A2 and B1 are often connected to form a three-wire, two-phase system. The A and B phase voltages are designed to be equal. Transmission Using Transformers Three-phase transmission saves material, installation time, and maintenance costs. A three-phase, 4-wire WYE system can provide 60° 1 A 2 6 B C 3 5 4 Figure 7-7 Six-phase connection (double wye).
Voltage control refers to intentional changes in the terminal voltage made by manual or automatic regulating equipment, such as a field rheostat. Voltage regulation refers to automatic changes in the terminal voltage due to reactions within the generator as the load current changes. Voltage regulation is defined as the percent difference between the voltage output when there is no electrical load (E@NL) and the terminal voltage is at full-rated current capacity (E@FL). The formula used to determine the percent of voltage regulation follows: E@NL – E@FL × 100 = % regulation E@FL For example, it is inherent in the design of a shunt generator for the output voltage to fall off as the load increases if there is no change in field resistance.
2. Restore the residual field by momentarily connecting a battery to the generator output leads. Because the field circuit is connected across the output leads, the current renews the magnetic field. Caution: If the armature is not free to rotate, damage to the armature assembly may occur. When the battery voltage is high enough in Method 3, the generator armature rotates as a motor. The rotation produced does not contribute to restoring the residual flux. However, this effect, called motorizing, is useful because it is a rough check of the overall generator operation.