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By John Markus; Vin Zeluff; Electronics

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To supply some lighting and small motors single-phase at 120 V, autotransformers of small capacity are employed to step down the 277 V to 120 V. Secondary voltages and connections will be explored further in discussing transformers and transformer connections. OVERHEAD VERSUS UNDERGROUND Although the original distribution system pioneered by Thomas Edison was a direct current low-voltage system installed underground, the widespread expansion of electric systems was based principally on the adoption of alternating current (through the application of transformers) and the very economic overhead type of construction.

The timing of the weld is of great importance and may be regulated by electronic timing devices. High-Frequency Heating High-frequency heating generates heat in materials by high-frequency sources of electric power derived from the normal (60-Hz) power supply. High-frequency heating is of two types: induction and dielectric. Induction heating. ) and is placed inside a coil connected to a high-frequency source of power; the high-frequency magnetic field induces in the material high-frequency eddy currents which heat it.

This type of system may be operated with the loop normally open or with the loop normally closed. Open Loop In the open-loop system, the several sections of the feeder are connected together through disconnecting devices, with the loads connected to the several sections, and both ends of the feeder connected to the supply. At a predetermined point in the feeder, the disconnecting device is intentionally left open. Essentially, this constitutes two feeders whose ends are separated by a disconnecting device, which may be a fuse, switch, or circuit breaker.

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