Io High During Startup
Posted 02 March 2007 - 08:08 PM
The supply to this motor comes from a panel which is at the output of a 13.8 kv/400 volts Dyn11 transformer.
The incoming panel to transformer has a Sepam relay which monitors overcurrent/earth fault etc.
Now, it is observed that during startup and before the starter is bypassed by the Bypass contactor the Io current is to the range of 50 amps (13.8kvside) but dissappears after the softstarter is bypassed.
What could be the cause of this abnormal Io current during startup?
Posted 16 March 2007 - 04:07 PM
May be your soft starter isnt working and your motor is having a direct start but i am not so sure couse you will here it if such a motor is having a direct start.
Posted 18 March 2007 - 06:39 AM
Posted 20 March 2007 - 07:23 AM
Io is residual current. This current is monitored by Sepam relay.
I am suspecting the relay itself, as there are no effects on plant as well the generator is also not reading it.
Posted 20 March 2007 - 07:26 PM
Posted 21 March 2007 - 03:48 AM
Some of our regulations in Australia prevent us from doing that, and therefore it become more difficult and more expensive to find a resolution.
Posted 05 August 2007 - 11:35 AM
We corrected the CT connections and and I0 went back to zero.
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