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Which Is Better- Three Phase Switching Or Two Phase Switching


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#1 deep

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Posted 19 March 2010 - 12:03 PM

Hi ,
I am using Thyristors for capacitor switching and have a question
Which switching is better for both capacitor and thyristor? All three phases or two phases only.
What is benefit and loss between them.

Regards,
Deep

#2 PowerQualityDoctor

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Posted 22 March 2010 - 03:21 PM

QUOTE (deep @ Mar 19 2010, 01:03 PM) <{POST_SNAPBACK}>
Hi ,
I am using Thyristors for capacitor switching and have a question
Which switching is better for both capacitor and thyristor? All three phases or two phases only.
What is benefit and loss between them.

Regards,
Deep



In short:
2 switches - less initial cost, less losses, capacitors always has voltage (longer discharge time after shutdown).
3 swtiches - allows unbalanced control (if the load is not equal on all phases)

To summarize, if the load is balanced, 2 switches is better.
Free Power Quality analysis at http://www.powerqualitydoctor.com

#3 marke

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Posted 03 April 2010 - 11:58 PM

Two switches is technically easier and lower cost.
The major disadvantage is that one phase is always connected to the capacitors which can be a problem if there is leakage to ground.
Two phase control also has lower power dissipation.

Best regards,




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