A prismatic upto KV or magnetic upto KV oil sight glass is provided on the expansion bowl. A top terminal is provided to connect to the over head line. Arcing horns are provided on request in between top shield and base plate. It is connected with a copper lead to the last condenser foil of the core directly. During normal service this test tap is electrically connected to the mounting flange trough test tap cover.
The threaded test tap cover must be fixed properly before putting into service. As bushing is a self contained unit, as such there is no specific maintenance to be carried out. However , a periodical check of the oil level and cleaning of the porcelain will normally be sufficient.
In order to determine the healthiness of the bushing , measurement of capacitance and tan delta may be carried out during annual maintenance. These values are to be compared with the pre-commissioning test results. Tan delta value more than 0. Which motor can conveniently operate on lagging as well as leading power factor?
A synchronous motor B wound rotor induction motor C squirrel cage induction motor D any of the above. Synchronous motor can operate at A Lagging power factor only B Leading power factor only C Unity power factor only D Lagging, leading and unity power factor only.
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