What is the difference between star delta and wye delta?

Answer 1

With a delta connection, picture a triangle. Each side of the triangle is a transformer or motor winding. Call the 3 corners of the triangle A, B, and C. There are only 3 wires except for a safety ground, which has no connection to, nor is any part of, the power transmission service lines.but for the star connection take our triangle above and use your wire cutters (literally) to cut the triangle apart at the corners. rearrange the three sides (transformer or motor windings) to form a Y. Where the three sides join in the centre, connect a fourth wire. Call this wire "neutral". Call the three ends A, B, and C. Connect the 3 supply service lines to A, B, and C.

Answer 2

A wye connection contains three phases that are tied together with a neutral connection. A delta contains three phases that are tied together but needs no neutral wire as each of them surves as a return path to complete the circuit back to the generator!

Answer 3

There is no difference. A three-phase 'star' connection is simply another name for a 'wye' connection. 'Star' seems to be the preferred name in Britain, whereas, 'wye' seems to be the preferred name in North America -although this is debatable.

Out of interest, the alternative name for for a 'delta' winding is a 'mesh' winding.

Answer 4

A star or (wye) winding is a three phase four wire system. Three "hot legs" and a common neutral wire that connects all three phase coils together at one point where it is grounded to the system ground. The voltage is taken from the other end of the phase coils. In addition a square root of 3 (1.73) voltage can be taken from each coil end and the grounded neutral. Phase voltage divided by 1.73 equals line to neutral voltage.

A delta winding is a three phase three wire system. All three phase coils are connected together end to end. The system voltage is measured from each one of these connection points.
"star" type transformer windings are used when a neutral is needed. "Delta" windings are for applications where a neutral is not usually required.

Answer 5

A wye connection or a star connection has three or more phases connected to a single point which is also known as neutral point where as the other ends are connected to voltages phase shifted from each other according to the number of phases. Hence in a wye connection we always get a phase connection across the load. Delta on the other hand has both ends of the load connected to the next phase. There is no neutral point and the current at a time enters through one phase and goes out through the other . Hence we always get the line voltages across the load.

Answer 6

In delta-wye there is a neutral on the secondary side. In delta-delta there is no neutral.

Answer 7

There is no difference. 'Star' and 'wye' are alternative names for the same connection. Similarly, 'delta' and 'mesh' are alternative names for the same connection.