Three similar coils,each of resistance 20ohm and inductance 0.07H are connected in star to a 415V,3-phase,50 Hz supply
A delta-connected capacitor bank connect to the system to improve the overall power factor to unity.
Find the capacitance per phase:
IL (Line curret)= IP(phase current)
IL=Vp/XL
IL=[415/√3]/ [20+2*pi*50*j0.07]
=8.06<-47.7 deg
power factor=cos-47.7
=0.673
P(Real power)=√3*VL*IL*cosθ
=3899W
S=3899/0.672
=5793 VA
For unity power factor,
cos θ=1
θ=90
When the apparent power times the sinθ, I get 0 for the reactive power.I will also get 0 for the capacitance?
How can I find the current going into capacitor ?Then , I can make use of V=RI to find the impedance?
A delta-connected capacitor bank connect to the system to improve the overall power factor to unity.
Find the capacitance per phase:
IL (Line curret)= IP(phase current)
IL=Vp/XL
IL=[415/√3]/ [20+2*pi*50*j0.07]
=8.06<-47.7 deg
power factor=cos-47.7
=0.673
P(Real power)=√3*VL*IL*cosθ
=3899W
S=3899/0.672
=5793 VA
For unity power factor,
cos θ=1
θ=90
When the apparent power times the sinθ, I get 0 for the reactive power.I will also get 0 for the capacitance?
How can I find the current going into capacitor ?Then , I can make use of V=RI to find the impedance?