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
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
Released for: Schneider Electric USA
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