Testing; Test Tap; Test Tap Adapter - ABB GSB 245 Technical Manual

T R A N S F O R M E R B U S H I N G S T Y P E G S B T E C H N I C A L G U I D E
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Testing

Routine testing
The bushing is routine tested according to
applicable standards. The tests include
measurement of partial discharge quantity, tan δ,
capacitance, and dry power frequency voltage
withstand test. The flange is separately tightness
tested with helium. A visual inspection is
performed and an individual routine test report is
issued with each bushing.
Type tests
Complete type tests have been performed and
reports are available on request.
Seismic qualification
GSB bushing with composite insulator have been
qualified in shake table tests for High
Performance Level IEEE 693-2005. Executed tests
also satifies seismic requirements for AG5 (0.5g)
of IEC TS 61463.

Test tap

The outer conducting layer of the condenser body
is connected to the insulated test tap. During
operation the protective cap must be fitted to
ground the outer conducting layer to the flange.
The maximum test voltage is 2 kV, 50 Hz for
1 minute. The maximum service voltage is 600 V.
Voltage tap, U

Test tap adapter

For permanent connection of the test tap to
measuring circuits, a test tap adapter is
sometimes required, for example if the IEEE
dimension standard for measuring tap is not
used.
= 6 kV, available as option.
r
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02 Test tap.
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03 Test tap adapter.
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