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  1. bashar2008

    CT short time thermal current

    is that means that secondary current has calculated to be able to attain 50 x In=250 Amp. for 1 sec? thank you sir for your kind attention
  2. bashar2008

    CT short time thermal current

    hi all i have seen a low tension CT of a ration 400/5 and read that its Ith=20KA and i wondered how can they specify that short time current level, as i know it is specified for primary current which it is not built in ct i mention that i know if the current in primary side risen up it is not...
  3. bashar2008

    Temperature rise as K?

    starting temp=20 degree C temp. rise = 140 degree Kelvin Final temp limit of appliance = 20+140 = 160 degree C thanks
  4. bashar2008

    Transformer testing

    i think according to IEC standards we apply 70KV (for 33KV winding) in power frequency withstand test for one minute and check transformer and we apply abt. 25 KV after that for partial dischage test in order to chech the 33kv winding insulation . thanks
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