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hkharmonic

Member Since 07 Apr 2006
Offline Last Active Apr 19 2007 03:42 PM
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Topics I've Started

Switchgear for capacitor

22 May 2006 - 03:30 PM

Hi, I have a question and want seeking for your advise.

For sizing the correct switchgear's rating for the "general & detuned" type capacitors, do we need to reserve extra rating for the detuned one ?

For example, we have two 3 phase capacitors (general & detuned) with the same capacity of 50KVar. How's the rating of switchgears we have to select ? Is there any difference in sizing the switchgear for detuned and general type capacitors ?

Switchgear for general capacitor = ( 50k / (sqrt(3)*380) ) * 1.35 .............. Correct ??

Switchgear for detuned capacitor = ???


Thank you in advance.

hkharmonic


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