Download Power Transmission And Distribution, 2nd Edition by Anthony J. Pansini PDF
By Anthony J. Pansini
This paintings describes undefined, mechanical and financial issues linked to the profitable making plans, layout, building, upkeep and operation of electric transmission and distribution of strength.
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Extra resources for Power Transmission And Distribution, 2nd Edition
Sample text
The voltage induced in the rotating primary depends on its relative position to the secondary; the rotation in one direction causes the voltage in the secondary to be added to the primary voltage, rotation in the opposite direction subtracts the voltage. Voltage regulators are most often located at the supply substation. They may be used in two ways: individual regulators associated with individual outgoing feeders; or one, larger in size, that regulates the voltage on a bus from which two or more primary feeders are supplied.
In general, standard distribution transformers usually are of additive polarity, while substation transformers are of subtractive polarity. Single-Phase Transformer Connections A typical arrangement of the method of bringing the terminals of the primary and secondary coils out through the tank of a single-phase distribution transformer is shown in Figure 2-19. To provide for flexibility of connection, the primary and secondary coils are usually each ar- Figure 2-18. ) Distribution System Electrical Design 47 ranged in two sections, each section of a coil having the same number of turns and, consequently, generating the same voltage.
They may also be employed on the last portion of a primary circuit, farthest from the source, usually in the boosting capacity. Often, a standard distribution transformer is used for this purpose. The primary and secondary coils are connected in series, essentially operating as an autotransformer. The primary coil is connected across the incoming primary circuit in the usual manner, while the outgoing primary is connected between the terminal of the primary not connected to the secondary and the terminal of the secondary coil.