Impact of high THD-F

[SKhaja]

Greetings Gents,

I have a situation where I had to get a power metering study done at one of the plant facilities for determining load amps at overhead busses connected to a LVS.

This was done to check whether or not the existing MCCB feeding the overhead bus is sufficient. What I discovered was that these busses have a high THD-F content (greater than 14%).

Could someone inform what implications could this have particularly when it comes to the sizing of cables ?

Thanks in advance.

 

[ron]

In the US we only have harmonic standards at the utility meter (point of common coupling), so I could refer you to the THD limits of IEEE 519, but that is not fair to compare the limit of the whole service to a particular feeder.

Generally no impact from THD to feeder sizing.