Help needed interpreting current transformer description
Help needed interpreting current transformer description
(OP)
I got a description of current transformer that asks for
3000/2500/2200/1000-5-5-5-5
Is this asking for four kinds of current transformers or is
this one current transformer with four wire coils?
Thanks!
3000/2500/2200/1000-5-5-5-5
Is this asking for four kinds of current transformers or is
this one current transformer with four wire coils?
Thanks!






RE: Help needed interpreting current transformer description
Probably for a multi-ratio CT. It is one CT with multiple tap on the secondary that allow you to have different ratio. For a multi ratio 3000:5 CT, the standard ratio with secondary tap are:
300:5 X3 - X4
500:5 X4 - X5
800:5 X3 - X5
1000:5 X1 - X2
1200:5 X2 - X3
1500:5 X2 - X4
2000:5 X2 - X5
2200:5 X1 - X3
2500:5 X1 - X4
3000:5 X1 - X5
See IEEE std C57.13 1993
RE: Help needed interpreting current transformer description
A little important thing to add:
If it's a class C200 3000:5 multi ratio, the class C200 only applied on the 3000:5 ratio. On the 1500:5 tap, it will be like a C100.
RE: Help needed interpreting current transformer description
You did not post the accuracy class but do not assume each core to have the same accuracy.
RE: Help needed interpreting current transformer description
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Help needed interpreting current transformer description
RE: Help needed interpreting current transformer description
Exactly correct, accept a ratio written as 3000/2500/2200/1000:5A is multi-ratio per CSA and not IEEE (splitting hairs of course).
The tap configurations in this case are the same as the IEEE 3000:5A MR designation. In some other cases, there are minor deviations between CSA and IEEE.
Randyman-
By the letter of the law (standard) something rated as 3000/2500/2200/1000:5:5:5:5A would only mean 4 cores/windings in a single unit.