
solutions
#1
Posted 12 October 2002 - 07:32 AM
Could anyone tell me more about "resonance" ? I 'm always confusing it.
Besides, how to switch the capacitors to correct the power factor? Detailed descriptions are more preferable.
Thanks a lot.
Lewis
;c;
#2
Posted 12 October 2002 - 08:34 AM
Could anyone tell me more about "resonance" ?
how to switch the capacitors to correct the power factor?
Using a power factor relay, you control contactors that switch the capacitors in and out of circuit. The power factor relay measures the power factor and if the measured power factor is higher than the highest power factor, a bank is opened, if the measured power factor is less than the set power factor, a bank is switched on. If it is still lower, another bank is switched on.
Best regards,
Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters
#3
Posted 12 October 2002 - 03:03 PM
How can I solve the problem of resonance?
And what capacitance of the capacitor should I use to insert to the system? What does it depend on?
How should I arrange the capacitors in a appropriate order?
Thank you.
Lewis
#4
Posted 14 October 2002 - 07:05 AM
How can I solve the problem of resonance?
And what capacitance of the capacitor should I use to insert to the system? What does it depend on?
How should I arrange the capacitors in a appropriate order?
Thank you.
Lewis
;a;
#5
Posted 16 October 2002 - 09:33 AM
How can I solve the problem of resonance?
Avoid adding capacitance to a lightly loaded supply.
what capacitance of the capacitor should I use to insert to the system? What does it depend on?
- Maximum correction required
- Minimum correction required
- stepsize required
- target power factor
You determine the maximum correction by esatblishing the worst case load conditions, and similarly the lowest correction from the minimum load conditions. The step size is determined by the load increments and the capacitor increments required to keep the power factor within you required bounds.
Best regards,
Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters
#6
Posted 16 October 2002 - 11:41 AM
Thanks for your help first.
Assuming I need to correct the power factor for a residential building.
1:What should I pay more attention ?
2:How can I monitor the resonance?
3:What is the "stepsize"?
4:Why sould I set the switching delay time?
5:How the switching sequence should be?
Thanks
Lewis:cool:
#7
Posted 16 October 2002 - 05:41 PM
The first question I would ask, is why correct a residential building? Generally, the power factor is not too bad and residential buildings are generally charged on KWHr only in which case there is no advantage in power factor correcting them!
I don't believe that there are any hard and fast or correct answers to your questions, you just do what seems best for your application.
Best regards,
Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters
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