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Voltage transformer in GIS

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ravindranathan

Electrical
Joined
Sep 30, 2006
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35
Location
IN
How is it possible to have such small size voltage transformer within 220kV GIS?
If we consider the ratio--220kV/110V and the turns that needs to be wound 2000--it is huge--still how do manufacturers manage to put it in such a small enclosure.

 

The main reason is that the GIS is enclosed in SF6 and dielectric clearance is significantly reduced compared with air. The AIS VT must have a large bushing to maintain the clearance between the energized part on top (xx kV) and the base tank at ground potential (V=0).

See the illustration below.

VT_GIS_vs_AIS_hy0zvq.jpg
 
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