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3phase 4 wire system is more reliable or 3 phase 3 wire systems?
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Answer Posted / suraj chawardol
We should have clear concept regarding where 3 phase 3 wire system used and where 3 phase 4
Wire system used
1.3 phase 3 wire system= In India electrisity is generat at 11 or 33 kv.then it is step up with the help of tranformer. To transfer it from generation station to substation 3 phase 3 wire system is used. Then it is step down at substation or directly feed to application having such rating. Genarally 11 kv feeder are brought near to distrubution transformer near to load ( near to home genarally called DP). The input to distribition transformer is 11 kv feeder and output of transformer is 440 v , 3 ,phase 4 wire system. ie 3 phase R,Y,B and one neutral.
2. 3phase 4 wire system = the secondary side of transformer is star connected so line voltage become 1/sq root 3, ie near 240 v . Our home appliances are design to work at Approximataly 230 v ,50 hz so we need any one phase and neutal for single phase load .
3. Also for high power application we need 3 phase 3 wire system such as Induction motor.
4. Both the system have its own importance depending on applications.
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Dear all, I just want to ask an expert on this forum for some insights. For the magnetic balance test, when applied voltage on a Delta-Star transformer e.g. Dyn11, the following relationships apply for HV side: 1. H1-H2 = H2-H3 H3-H1 2. H2-H3 = H3-H1 H1-H2 3. H3-H1 = H1-H2 H2-H3 For the LV side also: 4. X1-X0 = X2-X0 X3-X0 5. X2-X0 = X3-X0 X1-X0 6. X3-X0 = X1-X0 X2-X0 Is there a similar pattern for Y-d, Y-Y, D-d? And how about Y-z, D-z, Z-y transformers? I've tested a YNzn5 transformer and for LV side I don't see the pattern. In this particular case I got for LV side the following (see values below): H1-H0 H2-H0 H3-H0 X0-X1 X0-X2 X0-X3 128.0 119.9 7.2 29.2 13.3 15.8 70.7 128.4 59.2 23.4 22.0 3.6 7.2 120.1 128.1 13.4 29.3 15.8 What is the relationship here for LV? For row 1 I see the relationship, for row 3 I also see but it's shifted, but for row 2 I don't see such relationship. Any suggestions, answers, someone?
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