Summary of Estrella Delta Explicada

00:00:00 - 00:10:00

The video explains the concept of star-delta starters used to control the sudden increase in current for induction motors during the start phase that could cause electrical problems and fires due to overheating. The video demonstrates the Delta and Star connections, which require physical changes but can be automated using contactors. The Star connection uses less voltage and current, making it more efficient than Delta. The video provides a basic example of a simplified circuit and calculations to illustrate the concept further. Star-delta starters connect the motor to the power supply by configuring it in a star for a few seconds before changing it to delta, which is regulated by a timer.

• 00:00:00 In this section, the video explains how star-delta starters work for three-phase induction motors. The video begins by explaining that electricity is dangerous and that anyone working with electrical components should be competent and adequately trained. Three-phase motors are commonly used in most commercial and industrial buildings, and they produce a rotating magnetic field by passing a current through three separate coils. The coils produce a changing magnetic field, and when combined in the stator of the motor, this produces a rotating magnetic field that drives the rotor. Two methods can complete the circuit to create this field: the delta and star methods. These methods require physical connection changes, but it's possible to automate them by using contactors. The video explains that contactors are just switches that can open and close a circuit to control the flow of electricity.
• 00:05:00 In this section, the video explains the concept of star-delta starters that are used to reduce the starting current for induction motors, which can be more than five times higher than the current at full load. This sudden increase in current can cause electrical problems and even fires due to overheating. By using star-delta starters, the voltage during the start is reduced, which results in a lower current. Additionally, the video provides a basic example of a simplified circuit and calculations to understand the concept better. The star-delta starters are used to connect the motor to the power supply in the configuration of a star for a few seconds before changing it to delta, which is achieved by using a timer.
• 00:10:00 In this section of the video, it is explained that the difference between the Delta and Star connection is that in the Delta connection, the coil is exposed to the full 400 volts between the two phases, while in the Star connection the coil is only exposed to 230 volts between the phase and the neutral point. This means that the Star uses less voltage and therefore less current compared to the Delta version, which is the reason it is used.