A star delta connection is a type of electrical connection used for three-phase AC motors. It is used to reduce the starting current of the motor, which helps to prevent damage to the motor windings. Here is a diagram of the star delta connection:
Line Power ---[ Main Circuit Breaker ]---(L1, L2, L3) | | ------------------------------------- | | [Star contactor] [Delta contactor] | | | | (1, 2, 3) (U1, V1, W1) | | | | ---[Overload Relay]-----[Motor]---
The star delta connection consists of three main components: the main circuit breaker, the star contactor, and the delta contactor. The main circuit breaker is used to supply power to the motor. The star contactor is used to connect the motor windings in a star configuration during the starting phase. The delta contactor is used to connect the motor windings in a delta configuration during the running phase.
During the starting phase, the motor windings are connected in a star configuration, which reduces the starting current. Once the motor reaches a certain speed, the star contactor is switched off, and the delta contactor is switched on, which connects the motor windings in a delta configuration. This configuration provides higher torque and enables the motor to run at full speed.
The overload relay is used to protect the motor from overheating and damage due to overcurrent. It is connected in series with the motor, and if the current exceeds a certain level, the relay trips and cuts off power to the motor.
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