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MV Soft Staters on Synchronous Motors


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#1 mrmediumvoltage

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Posted 23 July 2004 - 03:35 PM

Does anyone have experience applying soft starters on synchronous motors? How is proper field protection and application achieved?

#2 marke

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Posted 01 August 2004 - 12:12 AM

Hello mrmediumvoltage

My experience is limited and very old!
The applications that I was accociated with many years ago, the motors were started as induction motors and then swiched to synchronous motor control. In this case, we applied a soft starter to the stator, and bridged the soft starter at full speed. The synchronous excitation etc were applied once at full speed, in the traditional manner.

Best regards,

#3 marke

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Posted 01 August 2004 - 12:12 AM

Hello mrmediumvoltage

My experience is limited and very old!
The applications that I was accociated with many years ago, the motors were started as induction motors and then swiched to synchronous motor control. In this case, we applied a soft starter to the stator, and bridged the soft starter at full speed. The synchronous excitation etc were applied once at full speed, in the traditional manner.

Best regards,

#4 jraef

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Posted 03 August 2004 - 08:24 PM

We do it all the time. As Marke described it, the starting function is no different than using any other starting method on the ammortisseur winding, it is just imperitive that the soft starter be in Bypass before the field is energized. We just interlock the Field Application Relay control to an Auxiliary contact of the Bypass Contactor. The excitation system can be / is the same. In many cases users will reuse the existing exciter system if it is relatively new and in good working order.
"He's not dead, he's just pinin' for the fjords!"




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