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Rotor Contactors


ram14375

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They are? I have never seen that. Are you saying that you have 6 slip rings then? Because if you only have 3 slip rings as I have always seen, how would you connect in Delta?
"He's not dead, he's just pinin' for the fjords!"
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They are? I have never seen that. Are you saying that you have 6 slip rings then? Because if you only have 3 slip rings as I have always seen, how would you connect in Delta?

 

dear jraef

We have only three slip and the these are shorted thru short circuit contactors

The delta connection i have mentioned is in the contactors which are used for shorting the rotors.

The short circuit contactors links are made in delta and star in certain cases

i would like to know the differences

ram

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Hi ram

 

Yes you are correct, the contactors can be arranged such that each pole shorts ring to ring, or connect each pole between a ring and a virtual star point.

 

The difference between the two connections, is the voltage across the contactor poles when the contactor is open, and the current through the poles when the contactor is closed.

 

The voltage in the delta connection is root three higher than in the star connection.

 

Best regards,

Mark.

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Hi ram

 

Yes you are correct, the contactors can be arranged such that each pole shorts ring to ring, or connect each pole between a ring and a virtual star point.

 

The difference between the two connections, is the voltage across the contactor poles when the contactor is open, and the current through the poles when the contactor is closed.

 

The voltage in the delta connection is root three higher than in the star connection.

 

Best regards,

Mark.

Dear Mark

thanks for your reply,

kindly let me know which connection would be advantageous

If he have a motor with rotor voltage 1455v and 1105 amps what is the contactor voltage/current rating if it is used in

star

delta

thanks

ram

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