Which Is Better- Three Phase Switching Or Two Phase Switching

[deep]

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

[PowerQualityDoctor]

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.

[marke]

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,