Current Transformer

[022574]

Hi,

May I know if a current transformer can be overloaded?
Let say I have a 100/5A CT and continuous current at primary varies from 140 to 210Amps,
Is there a possible that this CT will fail due to overloading?

Thank you and hoping any reply.

 

[Marmite]

To answer that question you would need the CT thermal rating factor. 100/5 is the ratio. The thermal rating factor could be 1, but it is more likely to be something else.

Regards
Marmite

https://www.google.com.au/url?sa=t&...BnMmzv8TTAhVGf7wKHRpCAlcQFggxMAM&url=https://

http://www.siemens.com/download?BTLV_44820&usg=AFQjCNGTfR3wPsxtTZnC05OC5XzWzWH7Ew

 

[022574]

Thank you for the reply,
but how can I identify the CT TRF for the attached CT Specs?

Regards,
22574

 

[022574]

Here is the attachment.
Thank you.

22574

 

[7anoter4]

From the attached list a 100/5 A CT withstand 1 sec 100*100=10 kA ,the maximum current
permissible in order to maintain the protection class error [ALF] it is 10 times the rated[1000 A] and the metering accuracy factor [SF]=5 -class 0.2.
rated output is 10 VA for 0.2 class and 15 VA for 0.5 class.
See for more information- for instance:
file:///D:/D_My%20Documents/Engineering/Metering/Current%20Transformers%20Cahier%20Shneider%20Electric%20194.pdf

 

[022574]

The 1000A permissible current to withstand is only 1second,
How about the max permissible continuous current ?

Thank you.

22574

 

[jghrist]

Unless you can find a thermal rating factor, you will have to limit continuous current to the rated primary current (100A).