The 3 phase impel induction motor can be connected in delta connection and star y connection. In the diagram of power circuit of star delta starter u2 and v2 of 3 phase motor should be connect to 4 and 6 respectively instead of u2 and v2 are connected to 6 and 4 of delta contector km2.
Star Delta Starter For 3 Phase Motor
Star delta connection for 3 phase motor. A star delta starter is the most commonly used method for the starting of a 3 phase induction motorin star delta starting an induction motor is connected in through a star connection throughout the starting period. This is similar to applying 380 volt to 220 v windings so clearly the motor would fail. In star connection the phase voltage is low as 13 of the line voltage. This video shows changes the induction motor wiring from star connection to delta connection. Therefore it needs a low number of turns hence saving in copper. Less commonly there is also an open delta connection where two single phase transformers are used to provide a three phase supply.
Then once the motor reaches the required speed the motor is connected in through a delta connection. In delta connection motor receives highest power output. There is minor correction is require to change printed in boxes sequence of 3 phase wires from w2 v2 u2 to w2 u2 v2 to get delta connection properly. If the motor is designed to run in star a 380v 3 phase power supply then it cannot be connected in delta on the same supply. Delta or mesh connection δ system is also known as three phase three wire system 3 phase 3 wire and it is the most preferred system for ac power transmission while for distribution star connection is generally used. This video is 3 phase motor connection proper star and delta connection full step by step a to z crimping tools amazon httpsamznto2akjmjo youtube playlist video.
These are generally only used in emergency conditions as their efficiency is low when compared to delta delta closed delta systems which are used during standard operations. In delta connection the phase voltage is equal to the line voltage hence it needs more number of turns which increase the total cost.
Gallery of Star Delta Connection For 3 Phase Motor
