about relay in phase current 1

[bulancak]

in abb'S handbook it says" set motor relay in phase current to 0,58 In (rated current ) " so what does this "relay in phase current " mean??

 

[bulancak]

i think it has something to do with line current versus winding current??

 

[ScottyUK]

The winding current in a delta connected winding is 0.58x line current. If the O/L relay is inside the delta and not in the line then the reduction must be applied to ensure the motor is protected.


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If we learn from our mistakes I'm getting a great education!

 

[rbulsara]

It applies to conventional star-delta starter wiring where all six leads of the motor are brought out and the O/L relay is placed in the delta loop. It also allows a relay of smaller range to be used.