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Are all Low Voltage Dry Type Distribution Transformers tested before they leave the factory? If so, what are the standard routine commercial product tests done on each Transformer?

Issue:
ST-20 Standard for Transformers

Product Line:
LV Transformers

Environment:
Applies to Low Voltage Transformers by SquareD/Schneider Electric

Cause:
Transformer testing

Resolution:

Every SquareD/Schneider Electric Low Voltage Dry Type Distribution Transformer receives and must pass the following tests per NEMA ST-20 before it is allowed to leave the factory:

Visual
Polarity and Phase Relation
Ratio-tests
No-load Losses and excitation Current
Dielectric - Applied potential and Induced potential

As well, there are additional tests completed per NEMA ST-20 on first design of each transformer rating:

Impedance
Load Loss
Dielectric - Impulse
Audible Sound Level



CTA-ID : 2000250
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