On a wye connection all three ends of the phase winding coils are connected together and grounded. The other end of the three phase winding are connected to the supply voltage.
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because y phase is y phase ...it is not b phase or R phase so it is high
It is very simple. Just interchange any two phase wires. i.e. Y and B ( or ) R and B ( or ) R and Y for example Stop the supply. keep R phase wire as it is and disconnect B phase wire and Y phase wire. Connect B phase wire to the Y phase motor stud and Y phase wire to the B phase motor stud. Now give the supply, now motor revolves in opposite direction to the earlier.
R - Red Y - Yellow B - Blue
It's just that, 3 phase, Y. It's typically used in large businesses and manufacturing facilities.
Postcode for Kidderminster in the West Midlands, UK. Also a vector group (connection configuration) of a 3-phase transformer.D - Means Delta Wound Primary Y - Means Wye (Star) Wound Secondary 11 - Is the phase shift between the two windings. The 11 refers to 11 on a clock face, hence 30 degrees.