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FRAX User's Manual
© 2011 Megger Sweden AB
5.5.2 Ground braid practice
The ground braid shall go from the C-clamp the shortest way to the bottom of the bushing.
Good ground connection is essential for reliable test results. Look at the next two pages for
more information.
The braid cable set consists of 4 x 3 meter tin plated copper braids. Many transformers have
bushings shorter than 3 m, which suggests two braids, one for each bushing, to be enough
when it comes to length.
The remaining braids can be used if bushings are taller than 3 m. See picture below how to
joint two braids.
The C-clamp allows a two braid practice, not necessary when using FRAX, but useful if
compatibility with previous two braid measurements is required.
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