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K - Factor

K - Factor

K - Factor

(OP)
Could anyone give me any good websites which discusses the K factor (US) or factor K (europe)

RE: K - Factor

I'm not sure of any websites, but, K-factor gives you and idea of how much heat a transformer can take.  For example, a K-4 xfmr can take 4 times as much heat as a standard xfmr, and so on.  As a side note, K-factor doesn't address harmonic mitigation, only heat.

Mike

RE: K - Factor

jstickley

That was an excellent link and I vote a star for you.

RE: K - Factor

(OP)
Thanks for your links,

Jstickley, the K-factor or Factor K I was talking about was to do with transformer derating due to harmonics.

RE: K - Factor

The K-Factor (used for rating transformers for harmonic currents) was has been introduced for marketing purposes in the US and is a very peculiar way to describe how harmonic currents lead to additional heating in a transformer.

Search the IEEE Transactions on Industry Applications for a very intresting dicussion on the origin of K-Factor and the drawbacks of that definition.

In Europe it is not common to use the K-Factor rating.

Two different applications have to be distinguised:

Dedicated converter transformer:
In this case it is common (and recommend by the approbiate IEC-standard) to specify the current harmonics for the most unfavorable operating condition when buying a transformer.

Distribution transfomer:
In this case most people don't worry about harmonics (regarding transformer heating!). I guess the reason is that in Europe the lines are not as much loaded with harmonics as in the US.

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