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Current Transformer Thermal Factor

thread248-502224

Current Transformer Thermal Factor

Current Transformer Thermal Factor

(OP)
Hi Gents,
I had a question - is the thermal factor rating on a current transformer refer to continuous or overload capability of an instrument to carry increase in current? For example, if 1000:5 CT has TF of 2.0 at 40 degree C ambient, does this mean that this device can carry 2000Amps continuously at 40 degree constant ambient temperature?
Thank you for clarifying.
EE

RE: Current Transformer Thermal Factor

Curious: Take a look at both IEEE Std 57.13 and the following link (which explains how the Thermal Rating Factor is applied).

https://www.hyee-current-transformer.com/info/curr...

The short form is that for higher thermal factors, the local ambient must be MUCH lower, because the CT winding total temperature (ambient plus rise) is limited to 85 C.

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