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March 9, 2019

7 Installation Tips To Effectively Reduce Electrical Transformer Noise

Electricity is a valuable thing that we need everywhere in home, office or in public places too. There are different types of electrical works that provide us comfort either in form of kitchen equipment or other households. For all these purposes we need electricity but what if electricity goes in that case we need a power generator. Still, the noise that originates from a power generator can’t be eliminated entirely, but it can be effectively reduced through proper assembly and design as well as following the correct installation guidelines.

What Is The Foremost Reason For Transformer Noise?

The primary cause of transformer generated noise is Magnetostriction which is basically the contraction and expansion of the iron core due to the magnetic influence of fluctuation currents which travels through the transformer coils.

The sound frequency that is produced is double the frequency of the power line operating frequency of the Transformer, for example, a 50Hz Transformer is producing sound at 100Hz. Besides the central frequency, harmonics are also created. Therefore, the typical office environment is approximately 50 decibels which means, the location of a 300KVA Transformer in such an area is likely to be the source of complaints. The 5-decibel difference in the usual office ambient sound level and the extreme sound level of the Transformer may not seem significant, but it should be kept in consideration that a 3-decibel rise in sound level measurement signifies twice of the actual level, making the 5-decibel escalation considerably higher than average.

It is palpable that even the most well-designed transformer can cause an issue when located in an area without considering the surroundings. The noise levels of the transformer can be reduced through proper installation.

Guidelines To Take Into Consideration For Proper Transformer Installation:

  • The highest sound level of the transformer must be matched against the probable ambient of its location. In the case of it being higher than the estimated ambient, the unit should be moved to a more suitable area.
  • Providing that the transformers are installed in areas such as motels or office buildings, it is advisable to have at least one unpopulated room between the transformer and the populated area.

  • The base of the transformer installation (for example: concrete floor) must weigh at least ten times more than the transformer, meaning that the mounting surface must not be exceeding the sound level.
  • Transformers must not be installed in corner locations as the sound will be echoed out into the room.
  • Ensure that the transformer unit is not mounted on thin walls such as curtain walls or plywood as they will amplify the sound levels.
  • Always ensure that the manufacturer’s installation instructions are carried out precisely, making sure that any vibration suppression devices included in the transformer design is incorporated.
  • When you are looking to purchase transformers, it can be highly advantageous to consider units that operate at sound levels which is below NEMA standards and the size of the units are 30KVA and larger. Units that have vibration isolation pads when shipped from the factory can help with ensuring the most trouble-free and quietest installation possible. Encapsulation can significantly suppress noise levels in units under 30KVA and in such a case vibration isolation pads will not be required.

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