Star Connection

Star Connection

Star connection is denoted by ‘ Y ‘. It is a 4-wire system and one of the type of Three-phase circuit. It consists of 3 phase wires and 1 neutral. There are two types of star connection, 4 –wire 3 – phase system (three-phase wires and one neutral wire) and 3 – wire 3 phase system (three-phase wires). Star Connections are mainly used for the Power Transmission Network for longer distances. This type of connections are required when there is need for a neutral point. It is mostly used in low and medium voltage distribution systems....

Current and Voltages in Star Connection

The Common point of the Star Connection is called Neutral or Star Point. Consider VR, VB , VY are three phase voltages and VRB, VBY , VRY are line voltages:...

Delta Connection

It is also called mesh connection. Delta connection is a 3- wire system and all the three wires are phases. No neutral wire in delta connection. Delta connection is denoted by Δ . Delta Connection is generally used in distribution networks. It is sometimes also in the shape of pi and mostly in shape of a triangle or can be referred to as delta. there is no common or neutral point available in the system. In this connection every wire is connected to two adjoining wires in the form of a triangle Δ, all three points form the three phases as shown below....

Current and Voltages in Delta connection

Consider IR , IB , IY are the Line Currents and IRB , IBY , IRY are the Phase Currents in Delta connection as shown below:...

Delta to Star Conversion

Consider three resistances RAB, RBC , RCA are connected in delta to the terminals A,B,C as shown below:...

Star to Delta Conversion

To get the delta connection resistors RAB,RBC,RCA from the star connection, Consider the star connection as shown below:...

Solved Example Based on Conversion

Find the equivalent delta connection of the circuit in star with resistances 2, 4 and 6 ohms respectively....

Comparison Between Star and Delta Connection

Star Connection Delta Connection Also called as ‘ Y’ or ‘Wye’ connection Also called as Mesh Connection. It is a 4- wire connection It is a 3- wire connection The common point in star connection is called Neutral or star point. There is no neutral point in delta connection. Line Voltage is root three times phase voltage i.e. VL=√3 VP Line Voltage is equal to the phase voltage i.e. VL=VP Line current is equal to the phase current i.e. IL=IP Line current is root three times phase current i.e. IL=√3 IP Star connection is used for long distances Delta connection is used for short distances....

Conclusion

In conclusion, this article discusses the star and delta connections used in the transmission and distribution of power. We discussed about star and delta connection starting with their definition, advantages, disadvantages, applications. In this article we can see that the star-connection is used for long distances due to the insulation required is less and achieve load balance because of neutral wire or conductor compared to the delta connection which doesn’t have any neutral wire unless if we provide it artificially. Based on the preferences and usability star connection can be converted into delta connection and vice versa, so that the advantages like Higher reliability, lesser cost delta connection is used and for the application of both transmission and distribution networks star connection is used....

FAQs on Star and Delta Connection

What is the Total power for star Connection ?...