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Quick Start Tutorial
© 2011 Megger Sweden AB
Make sure to follow local safety regulations! Local safety regulations most certainly prescribe
all bushing connections to be earthed/grounded when working on the transformer e.g.
connecting the FRAX test leads. The ground braid shall go from the top clamp the shortest
way to the bottom of the bushing. Good ground connection is essential.
Important! The test connection polarity is important since reversed polarity will produce
different results. The user has to establish a polarity convention. In this software it is assumed,
and recommended, that H1-H0 imply the red/yellow connectors (source and reference) is
connected to H1 and the black (measure) is connected to H0.
Connect FRAX test leads:
Make sure to remove paint and or rust from the nuts or bolts used on the flange for proper
measurement ground connections.
Connect the red and yellow (source and reference) to the clamp at the top of a bushing and
corresponding ground braid to the base of bushing. Make sure that the braid do not touch
any conducting part at top of bushing.
Connect the black (measure) lead to the clamp at the top of the other bushing and the
corresponding ground braid to the base of bushing. Make sure that the braid do not touch
any conducting part at top of bushing.
Following local safety regulations, remove possible ground connections from top of the
bushings.
Using an easy repeatable cable setup is crucial to ensure reliable FRA results.
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