Assortment of small ceramic bushings for voltages from a few hundred to a few thousand voltsHigh-voltage bushings on a utility transformer at an electrical substation. These probably operate at several hundred thousand volts.
In electric power, a bushing is a hollow electrical insulator that allows an electrical conductor to pass safely through a conducting barrier such as the case of a transformer or circuit breaker without making electrical contact with it. Bushings are typically made from porcelain, though other insulating materials are also used.
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