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CTs performance

CTs performance

CTs performance

(OP)
Hi,
I am new to this forum. But I found it is very helpful.
 It is like a classroom where we can discuss and get answers from teachers.

Today, I have another question. I am reading through IEEE buff book. On page 126,127, it says :Device1 146VA at 40A at 52.4'.device2 realy instantaneous unit: 40VA at 40A AT 78.5.
 i am not sure where those values are from.Thanks in advance.

RE: CTs performance

(OP)
The reason I am askinh this question is, I found the degree values I got  from  the power factors are slightly larger than those used on Page 126,127.

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