5A CT secondary
5A CT secondary
(OP)
My system has a 1200:5A MR CT that is being used on the 800:5A tap. If the transformer was fully loaded at it's 2 stage forced cooling rating, the total CT secondary Amps would be 6. Is it ok to use a CT with a nominal current above the 5A rating?






RE: 5A CT secondary
RE: 5A CT secondary
RE: 5A CT secondary
RE: 5A CT secondary
RE: 5A CT secondary
RE: 5A CT secondary
Take a look at page 6 of the attached pdf.
3.2.1.3 For a multi-ratio internal bushing current transformer with a maximum rating equal to the nameplate rating of the equipment in which it is installed, but which is operating on a reduced tap, the calculated equipment capability should
be reduced by the factor:
SQRT(It/In)
Where It is the reduced tap current rating, and In is the maximum current rating of the current transformer.
If information is not readily available on the continuous thermal rating factor of a bushing current transformer, the manufacturer should be consulted.
RE: 5A CT secondary
RE: 5A CT secondary
What is the manufacturer and Cat # of the CT?
RE: 5A CT secondary
RE: 5A CT secondary
RE: 5A CT secondary