K-rated Transformers

[MatthewEE]

I'm curious what most people are seeing nowadays with respect to K rating for dry-type xfmrs in various applications. It seems like K-ratings above K1 are becoming a thing of the past. Is that what you're seeing as well?

 

[infinity]

Out in the field over the last 10 years with the exception of maybe a data facility K rated transformers seem to be a thing of the past for general use.

 

[jim dungar]

Out in the field over the last 10 years with the exception of maybe a data facility K rated transformers seem to be a thing of the past for general use.

Except, it seems, for public (government money) projects where the design specifications are still using boiler plate language from several decades ago.

 

[infinity]

Except, it seems, for public (government money) projects where the design specifications are still using boiler plate language from several decades ago.

Highly probable. In the private sector commercial world it appears that they're trying every angle to save money. I remember working on a project for 911 center where they were still using K-rated transformers and isolated grounds. When I asked the engineer why he said it was part of their boiler plate spec from the last two decades.

 

[JoeStillman]

I think developments in computer power supplies like higher frequency switching have affected the harmonic content a lot. We'd be using k-rated transformers for all our LED lights too if the old technology was in use for them.