TRANSFORMER TURNS RATIO TESTING 5 – 0
A Transformer Turns Ratiometer does exactly as its name implies; it is
used primarily for checking how many Turns of wire are in the primary
side and the secondary side of a transformer. The Turns Ratio test set
does not tell exactly how many turns of wire are in the primary and
secondary coils. But rather, it measures and displays the Ratio of
(or comparison of) the number turns in the primary coil to the number
of turns in the secondary coil.
This is an extremely useful device for checking for shorted turns and
incorrect settings of tap changers.
It is important to understand that the Nameplate Ratio on most
transformers is the Voltage ratio (Voltage in: Voltage out) and this Ratio
is determined, basically, by the number of turns of wire on the Primary
(High side), the number of turns of wire on the Secondary (Low Side).
On a single phase Transformer the Turns Ratio is the same as the Voltage
Ratio.
A Single Phase transformer:
For example: The High Side Winding may contain 940 Turns : Low Side
Winding 440 Turns.
Therefore:
3 Phase Transformers (of different configurations) the turns ratio &
voltage ratio can be different.
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