Star and Delta Connections are the two types of connections in a 3 – phase circuits. A Star Connection is a 4 – wire system and a Delta Connection is a 3 – wire system. Before going in to details of the Star Connection, Delta Connection and comparing those two, let us have a very brief note on three – phase electric power. Difference between Star and Delta Connection. This article covers the key differences between star and delta connection on the basis of several important factors such as their configuration, voltage, current, power, motor speed, neutral point, number of turns, insulation level, and applications. For example, the Wye connection requires fewer turns than the Delta connection (1.732:2) to achieve the same electrical characteristics. This makes machine winding smaller motors with narrow stator slots easier. On the other hand, a portion of the leads in a dual-voltage, Delta connection can be a smaller diameter than those of a Wye. The power difference between star and delta is 1.7322, or 3, and between delta and star is 0.57742, or 0.3333. In a wye connection, the line current is equal to the phase current. Basically, the difference is because of the configuration. With the wye connection, what you're calling a star, you have the connections made on the outside of the three lines, with a neutral in the middle. On the delta connection, the triangle, the connections are also on the ends, but without a neutral in the middle. In this video, the concept of Delta Star is explained. The viewer is taught how to convert from Star to Delta and vice versa. Delta Star transformation allow This technical article describes the basic principles of three phase systems and the difference between the different measurement connections that are possible. Three phase systems. Wye or Star Connection. Delta Connection. Wye and Delta Comparison. Power measurements. Single-Phase wattmeter Connection. Single-Phase Three-Wire Connection. The star-star, delta-delta, delta-star and star-delta connections are taken up in order and their individual peculiarities and characteristics, precautions that must be taken in operation to avoid trouble and where and when the system may be grounded with best results, are discussed. The question of delta-delta vs. delta-star is considered: (1) For moderate voltages the delta-delta system has Voltage is defined as the amount of work done in bringing a unit positive charge from infinity to a point in the electric field. The terms line and Phase voltage are usually used in Alternating Current (AC) power supply systems, especially in the case of star and delta connection systems and three-phase electrical power systems. The typical star-delta control circuit wiring diagram in the CAD drawing below will help you follow the explanation. The star-delta control circuit illustrated above actuates magnetic contactors that interchangeably execute star-delta motor connections. Pushing the ON switch causes the motor to start running from the star connection to the Tor34f.