Jump to content


hkharmonic

Member Since 07 Apr 2006
Offline Last Active Apr 19 2007 03:42 PM
-----

Posts I've Made

In Topic: Switchgear for capacitor

23 May 2006 - 03:27 PM

Hello Marke.

Thanks for your advise. Actually, the rating of 50KVar is the total reactive power for the capacitor after adding the detuned reactor. The manufacturer catalogue suggest the detuned capacitor bank should be used with a larger rating of switchgear. So, I am curiosity for why we have to pay for it ?

I think it may due to the system's harmonic and capacitor's detuning frequency.(i.e. 189 Hz) Is it right ?

I can realize for the reduction of inrush current as the impedance of capacitor increases as well. But, in this point of view, the switchgear for the detuned capacitor should be used with a smaller rating than the general one. Agree?

Thanks,

hkharmonic

In Topic: 2-phase loading in 3-phase circuit

09 April 2006 - 02:59 AM

Dear Mark,

It's poor that for the imbalance power factor. The system I think exactly has the problem you mentioned. But, why the total imbalance in power factor will appears? Is it because the phase-Y without load connected overcompensated by capacitor ?

Apart from the penalty for the lead power factor on one phase, will the power factor can be improved on the other two phases ? Beacuse there is no penalty for the power factor in leading sign in HK.

Best regards,

HK

In Topic: 2-phase loading in 3-phase circuit

08 April 2006 - 03:04 PM

Hello Mark,

Thanks for your advise. For power factor correction, 3-phase capacitors (Ph-R, Y & B) were connected to the system. Will it function the same as to connect across only 2-phases ?

For the existing 3-phase PFC, any bad effect ? Will it waste the phase of capacitor without load connected ?

Best regards,

HK

In Topic: 2-phase loading in 3-phase circuit

07 April 2006 - 02:06 PM

Dear Friend,

We have conducted an energy audit to a 2-phase loading which was supplied by a 3-phase circuit (Phase R & B). We found that the power factor with both the leading and lagging signs for the phases. Why?

Since we're not often work with the 2-phase loading, so would the expert here can give me some advise on how's the 2-phase loading works ? i.e. power factor, current

Thanks,

HK