Medium Voltage Dry Type Transformer sound level/noise issues.

Issue:
What would be some of the causes for excessive Sound levels (dB Decibels) for Medium Voltage Transformers ?

Product Line:
MV Transformers

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

Cause:
Transformer noise levels

Resolution:
The majority of sound level issues are the result of the following possible conditions:

1. An overexcited core caused by an elevated primary voltage. An overexcited core can result in elevated secondary voltages, sound levels, and temperatures. A corrective
action would be to lower the incoming voltage, or change the tap links located on the front of the Transformer coil assemblies.

2. Inadequately designed installation. SquareD/Schneider Electric recommends a minimum clearance of 10 ft on all sides of the Transformer except for the floor. Avoid installing Transformers in corners, hallways, stairways, or near heating and air conditioning ducts. Hard surfaces can also reflect and/or amplify sound waves. Use acoustic absorbing materials on walls, floor, and ceiling when installing .

3. Upon Transformer delivery, confirm the shipping washers placed between the core & coil assembly mounting channels and the base channels have been removed. Removal of the shipping washers will allow the core & coil assembly mounting channels to rest upon the vibration/sound isolation pads located between the core & coil assembly mounting channels and the base channels.

Released for:Schneider Electric USA