You are viewing the waveform or measuring the current? If you are measuring the waveform in its output of VSI, you will get the sinus waveform with harmonics. For measuring the current you should have true RMS meter.
There is another softstarter also available in market. That is magnetic soft starter. This work on principle of flux compansating technique. I have seen this up to rating of 5.4MW. This is alos very robust in construction.
Dear Mr. Kabos,
First of all where are u measuring this current? Is this reading taken from the relay. Hope connection must be residual for the earth fault element. In this condition there are chaces of some curent in earthfault element due to mismatch of the CTs. Tell about the problem in detail?
A 660kw induction motor when stopped after large vibration during service, has shown damage to bearing .When the shaft was attended (welding was carried out at damaged area of bearing seat) and bearing were replaced, the motor was re-assembled after rotor balancing was carried out.
Now there is...
