Milind Posted December 9, 2006 Report Share Posted December 9, 2006 Hi !! I have a question regarding power factor control relay. As you know these relays can sense the power factor and switch on or switch off the capacitor banks to achieve required power factor. This relay gets current input ( may be through CTs ) and voltage input ( may be through PTs ). My questions is: In orer to calculate the system PF and control capacitor banks accordingly, does the MAGNITUDE of the current signal and voltage signal is of any importance or the relay will ignore the actual values and just see what is the phase angle between current and voltage? regards, Milind Link to comment Share on other sites More sharing options...
marke Posted December 9, 2006 Report Share Posted December 9, 2006 Hello Milind If the power factor relay measures displacement power factor only, then the magnitudes of the voltage and current waveforms are not important. If the power factor relay measures true power factor (displacement plus distortion) then the amplitude and waveform shape are important. Controlling capacitor banks can only affect displacement power factor, so many such relays measure displacement power factor only. Best regards, Mark Empson | administratorSkype Contact = markempson | phone +64 274 363 067LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters Link to comment Share on other sites More sharing options...
jOmega Posted December 10, 2006 Report Share Posted December 10, 2006 see: http://www.ssac.com/motorpro/lwndsmp.pdf jΩ Link to comment Share on other sites More sharing options...
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