Can the PT windings' polarities be swapped without affecting the measurements ?
Issue
Both the primary and the secondary PTs have been reversed for ease of installations in some cases as shown below.
Normal PT setup Both of PTs primary and secondary sides are reversed
Product Line
All Powerlogic devices that need a set of PTs
Resolution
Swapping the polarity at both the primary and secondary sides of the PT as shown in above diagram cancels the effect - the signal will not be inverted and the meter should be able to monitor the system as designed. However, if only one of the sides is swapped, the signal will be inverted and the meter might not read the correct voltage values.
Publié pour: Schneider Electric Belgium
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