CT
CT
(OP)
What is meant by 5p10 in an ct.
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RE: CT
“10”…………….Declare composite error at accuracy limit primary current (Ex 2.5 & 10)
“P”………………Indicates the CT classification (Ex. P=Protection, M=Metering, TP)
“15”……………..Rated secondary reference voltage (Ex. 10,15,20, 30, 75).
The rate accuracy factor other than 20 should be indicated in the designation.
NOTE: There is an equivalence ANSI designation (Ex C100 to C800)
RE: CT
1 - cuky - should your "15" be "5"
2 - can you remind me how we determine the rated burden (needed to transform the voltage into a current).
RE: CT
Thanks for your observation, I mixed-up the above numbers. Please correct as follow:
"5"....Composite error
<5% at rated accuracy limit primary current.
"10"...Rate accuracy limit factor
i.e. Overcurrent = 10 x rated normal current.
The prefer way to express the burden in IEC generally is given in VA and is calculated as follow:
Sb = Zb.I2ns
Were:
Sb= Burden (VA)
Zb= Burden (Ohm)
Ins=Rated secondary current(amp).
RE: CT
RE: CT
http://www.bender.org/ws50x80s.pdf
etc. IEC CT
RE: CT
http://www.photonicpower.com/app_notes1.pdf
for optically powered CT