ABB GSB 245, Technical Manual

TR A N S FOR M E R BUS H I NG S T YPE G S B 

T EC H N I C A L  G U I D E

7

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Testing

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02 Test tap.

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03 Test tap adapter.

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

r

= 6 kV, available as option.

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.