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81331 Rev 01 Nov 2010

Bushing Tests

SF6 dead tank circuit breakers occasionally utilize condenser bushings with test

taps which should be routinely tested whenever the overall insulation of the

breaker is tested.

The table supplied may be used to measure the C1 insulation on condenser

bushings, if so equipped. The HV lead is connected to each bushing top

terminal, in turn, and the LV Red lead is connected to the respective bushing test

tap. For all tests, test mode is UST-R. At the completion of each test, the HV

and Red leads are then moved to the next bushing to be tested.

Diagnostic Tests

These tests provide flexibility for performing more diagnostic tests in the event

that an area of concern presents itself. Each test line allows the operator to

choose between test modes UST-R, and GST-GND. A detailed description of

the tests performed should be documented on the form, both in the

Specimen/Connection field and the form Comments field.

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Delta 4000 Bedienerhandbuch Seite 74