- #1
nothing909
- 170
- 4
I just want to know if my method is correct in answer a question like this...
Three impedances z1=(2-j5), z2=(3+j4) and z3=(8+j0) are connected in delta to a 3 phase, 400v 50Hz supply.
1. Find the three line currents Ia, Ib and Ic
2. Find the S,P and Q and power factor for the load
3. If the nodes are now connected in star with a neutral connected, find the current in the neutral wire.
I'm on question 3 and I just want to know if this is the correct method to work it out:
1. Work out Yan, Ybn and Ycn.
2. Work out Vn'n using the equation Vn'n=(VanYan)(VbnYbn)(VcnYcn)/Yan+Ybn+Ycn
3. Work out the new phase voltages by doing Van'=Van-Vn'n , Vbn'=Vbn-Vn'n , Vcn'=Vcn-Vn'n
4. Work out the new phase currents by doing Ian'=Van'/Zan' , Ibn'=Vbn'/Zbn' , Icn'=Vcn'/Zcn'
5. Add all the new phase currents up and that'll give me the current in the neutral?
Is that the correct method to work it out? Have I did a step wrong or missed anything out?
Three impedances z1=(2-j5), z2=(3+j4) and z3=(8+j0) are connected in delta to a 3 phase, 400v 50Hz supply.
1. Find the three line currents Ia, Ib and Ic
2. Find the S,P and Q and power factor for the load
3. If the nodes are now connected in star with a neutral connected, find the current in the neutral wire.
I'm on question 3 and I just want to know if this is the correct method to work it out:
1. Work out Yan, Ybn and Ycn.
2. Work out Vn'n using the equation Vn'n=(VanYan)(VbnYbn)(VcnYcn)/Yan+Ybn+Ycn
3. Work out the new phase voltages by doing Van'=Van-Vn'n , Vbn'=Vbn-Vn'n , Vcn'=Vcn-Vn'n
4. Work out the new phase currents by doing Ian'=Van'/Zan' , Ibn'=Vbn'/Zbn' , Icn'=Vcn'/Zcn'
5. Add all the new phase currents up and that'll give me the current in the neutral?
Is that the correct method to work it out? Have I did a step wrong or missed anything out?