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 Star-Delta connection




 Star-Delta connection is a type of three-phase electrical connection used in power transmission and distribution systems. It involves connecting the windings of a three-phase motor or transformer in two different configurations - the star (Y) configuration and the delta (Δ) configuration.

In the star configuration, the three windings of the motor or transformer are connected together at a central point, known as the neutral point. Each winding is also connected to one of the three phases of the power supply.

In the delta configuration, each winding of the motor or transformer is connected in a loop, with one end connected to the start of the next winding and the other end connected to the end of the previous winding.

The star-delta connection allows a motor or transformer to be started with reduced voltage, which can be useful in applications where a high starting current could damage the motor or cause a power outage. During the starting period, the motor is connected in the star configuration, which limits the current flow to one-third of the normal operating current. Once the motor is up to speed, it is switched to the delta configuration, which provides full voltage and current.

Star-delta connections are also used in power transmission systems to reduce the voltage drop and improve the efficiency of power transfer over long distances.

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