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Схеми на свързане
Обща информация
Y or Star connection
Connecting together the W2, U2, V2 terminals (star point) and connecting to the mains the U1, V1, W1 terminals a star connection is obtained.
The phase current Iph and the phase voltage Vph are as following:
Iph = In
Vph = Vn/3
Where:
In:
the line current
Vn:
the line voltage
Δ or Delta connection
Connecting the end of each winding to the beginning of the next winding a delta connection is obtained.
The phase current Iph and the phase voltage Vph are as following:
Iph=In/3
Vph= Vn
Star-Delta starting
The star-delta starting is an easy way to reduce the starting current and starting torque.
Motors can be started with the star-delta method only when the supply voltage corresponds to the rated voltage of the motors in delta connection.