Dry test transformer energy storage sound

How to test a transformer noise level?

It is necessary to take many read-ings around the transformer and to aver-age them. The resultant will become the transformer noise level. The industry standard defining audible sound level testing for low voltage dry-type transformers is NEMA ST 20 and IEEE C57.12.91-2011 for medium voltage dry-type transformers.

How do you test a low voltage dry-type transformer?

The industry standard defining audible sound level testing for low voltage dry-type transformers is NEMA ST 20 and IEEE C57.12.91-2011 for medium voltage dry-type transformers. The test procedure for low voltage dry-type transformers is to take a minimum of four measurements one foot away from the contour of the transformer surface.

Can a symmetrical transformer be a noise level meter?

Since the transformer is not necessarily symmetrical, we cannot take one read-ing of noise level from a sound level meter and call the noise level of the unit. It is necessary to take many read-ings around the transformer and to aver-age them. The resultant will become the transformer noise level.

What are typical load sound levels for liquid-immersed three-phase transformers?

Typical load sound levels for liquid-immersed three-phase transformers from 300 kvar to 300 Mvar reactive power according to CIGRE working group A2.54 are shown in Fig. 6.7 (50 Hz) and Fig. 6.8 (60 Hz). Specification of sound levels below the typical average will likely result in increased mass, dimensions, and also costs.

What is a test description for a dry-type transformer?

1. Scope This is a general test description for dry-type transformers at SGB and will apply if no specific customer requirements are given for the individual tests. Special customer standards or values are not included in this description. If not indicated, the description is exemplary for a three-phase transformer with two winding systems.

How do I measure the sound level of a transformer?

The transformer will always be measured at IP00 AN, if applicable also in AF and with the FAN ́s alone. Sound level measurement in an enclosure (e.g. IP21) is a special test and must be ordered separately. 4.4.1.