Star delta connection

Comparison between Star and Delta Connections We mostly use the terms star and delta in electrical systems while discussing three phase AC circuits and difference between Star (Y) and Delta (Δ) Connections. Star Connection: Star connection “Y” is obtained by joining together similar ends of coils either “starting” or finishing. The other ends are joined to the line wires. The common point is called the Neutral or Star Point. This three-phase, 4-wires system is used in Delta Connection Delta or Mesh Connection “Δ” is obtained by connecting the starting end of the first coil to the finishing end of the second coil and so on (for all three coils) which forms like a In both systems, the Voltage between two phases (Line to Line) is known as Line Voltage, while the voltage between Phase to Neutral (Line to Neutral) is known as Phase voltage. The voltage between any line (or phase) and Neutral is • Related Post: The following table better summarizes the differences and comparison between Star and Delta Connection. STAR Connection (Y) DELTA Connection (Δ) In STAR Connection, the starting or finishing ends (similar ends) of three coils are connected together to form the neutral point in the shape of letter “Y”. A common wire is taken out from the neutral point which is known as the Neutral Wire. In DELTA Connection, the opposite ends of three coils are connected together which forms the shape of Greek alphabet “Δ”. In other words, the end of each coil is connected with the starting...

Difference between star and delta connection are explained considering various factors like the basic definition of the connections, the existence of a neutral point, the connection of the terminals, the relation between line current and phase current and also between line voltage and phase voltage, speed, its insulation level, number of turns, type of system and network usage, etc. The difference between the Star and Delta Connection are given below in the tabulated form. BASIS STAR CONNECTION DELTA CONNECTION Basic Definition The terminals of the three branches are connected to a common point. The network formed is known as Star Connection. The three branches of the network are connected in such a way that it forms a closed loop known as Delta Connection. Connection of terminals The starting and the finishing point that is the similar ends of the three coils are connected together. The end of each coil is connected to the starting point of the other coil that means the opposite terminals of the coils are connected together. Neutral point Neutral or the star point exists in the star connection. Neutral point does not exist in the delta connection. Relation between line and phase current Line current is equal to the Phase current. Line current is equal to root three times of the Phase Current. Relation between line and phase voltage Line voltage is equal to root three times of the Phase Voltage Line voltage is equal to the Phase voltage. Speed The Speed of the star connect...

For star delta stater,the motor connection must have 6 cables from control panel and 6 terminals at induction motor ( U1,U2,V1,V2,W1,W3).To wiring the motor connection for star delta starter,the important thing that we must fully understand is about the basic of STAR DELTA MAGIC TRIANGLE. For detail about Don`t worry,it simple and easy if we understand the basic concepts.I explains detail step by step how to do it :D What is Star Delta connection? Star delta magic triangle When we refer to this diagram,We can see correct terminal for the winding for each phase : *CAUTION: Please refer to the name plate of motor to confirm the winding numbering ( U1,U2,V1,V2,W1,W2 ) and the motor connection of winding. Why it very important??Because each manufacturing have their own style for numbering and winding motor connection. Star Delta phase and terminals RED PHASE : U1 and W2 YELLOW PHASE : U2 and V1 BLUE PHASE : V2 and W1 So..from this formula,we must wiring the motor follow the phase color code. See my example below :- We can refer the complete wiring for star delta starter diagram below.If you want change their rotation for clock-wise or anti clock-wise,you need change two of phase ( RED or BLUE) at delta contactor.I share the technique If you want motor rotation for clock-wise,the phase colors are RED,YELLOW,BLUE.But if you want anti clock-wise rotation,the phase colors are BLUE,YELLOW,RED.For star delta control wiring diagram,please refer to my post about Please give the curve ...

Star/wye connection and delta connection are the two different methods which are used for connecting 3 phase system. In this video, we’ll learn following in detail. 1. Star Connection 2. Delta connection 3. Voltage and current relationship in both the connections 4. And where these connections are used. So, if you want to get the details, you need watch the video. Recommend reading before moving on in this tutorial 1 phase and 3 phase power Star Connection Connection shown in the above figure is one of the way to connect 3 phase generator to the load. As you can see this connection requires 6 wires to connect. The three-single phase circuit shown in this figure are electrically independent. But if you observe the image carefully you’ll find that, we can combine the three return conductors together to form a single return conductor. As a result, we have saved cost of two conductors, as the number of conductor are reduced from 6 to 4. Now, this common return conductor is called as Neutral conductor. It carries sum of three currents Ia + Ib + Ic. At first, many of the people will think that, the conductor required for neutral should be 3 times in the size than the other three conductors. But, as we know, current of the three phases are out of phase by 120 deg from each other. And if we draw a waveform for these current it will look like this. Now, if you observe the diagram carefully, you’ll find that the sum of return currents is zero at every instance. For example, at insta...

Star and delta are two terms that are associated with how we connect electric motors. A motor is configured to one or the other so connecting the motor in the correct way is crucial to ensure that it operates with no issues. In this article, we will show you how to identify if a motor is connected in star or delta, where to find this, and also answer some faqs. Let’s start by taking a look at how to identify if a motor is wired in star or delta. How do you know if a motor is wired in star or delta? By looking inside the terminal box of a motor you can easily determine if the motor is wired in star or delta. The connections are located in the terminal box of the motor which is normally mounted on the body of the motor. The terminal box adds easy access to perform fault-finding exercises, electrical tests or when rewiring/repairing the motor. We will take a look at some images of motor termination boxes below that show what a motor would look like when connected in star and delta. Motor Terminal Box Wired in Star Below is an image that shows what the terminal box/wiring will look like if the motor is wired in the star configuration. Star Motor Terminal Connections As you can see, the motor connections are linked across the top of the terminal box and W2, U2 and V2 are all joined. Motors use metal plates to link the terminals which act as the components that link the connections together. Motor Terminal Box Wired in Delta Below is an image that shows what the terminal box/wir...

A star delta starter is the most commonly used method for the starting of a A star delta starter will start a motor with a star connected stator winding. When motor reaches about 80% of its full load speed, it will begin to run in a delta connected stator winding. A star delta starter is a type of reduced voltage starter. We use it to reduce the starting The starter mainly consists of a TPDP switch which stands for Tripple Pole Double Throw switch. This switch changes stator winding from star to delta. During starting condition stator winding is connected in the form of a star. Now we shall see how a star delta starter reduces the starting current of a three-phase induction motor. For that let us consider, V L = Supply Line Voltage, I LS = Supply Line Current and, I PS = Winding Current per Phase and Z = Impedance per phase winding at stand still condition. As the winding is star connected, the winding current per phase (I PS) equals to supply line current (I LS). As the winding is star connected, the Hence, the winding current per phase is Since here, the winding current per phase (I PS) equals to the supply line current (I LS), we can write, Now, let us consider the situation where the motor gets started with delta connected stator winding from same three phase supply points, Here, I LD = Supply Line Current and, I PD = Winding Current per Phase and Z = Impedance per phase winding at stand still condition. As the winding is delta connected, supply line current (I LD) is ...

Key points • As Primary in Star connected • Line voltage on Primary side = √3 X Phase voltage on Primary side. So • • Now Transformation Ration (K) = Secondary Phase Voltage / Primary Phase Voltage • Secondary Phase Voltage = K X Primary Phase Voltage. • As Secondary in delta connected: • Line voltage on Secondary side = Phase voltage on Secondary side. • Secondary Phase Voltage = K X Primary Phase Voltage. =K X (Line voltage on Primary side / √3) • Secondary Phase Voltage = (K/√3 ) X Line voltage on Primary side. • There is s +30 Degree or -30 Degree Phase Shift between Secondary Phase Voltage to Primary Phase Voltage Advantages of Star Delta Connection • The primary side is star connected. Hence fewer numbers of turns are required. This makes the connection economical for large high voltage step down power transformers. • • The neutral point allows both types of loads (single phase or three phases) to be met. • Large unbalanced loads can be handled satisfactory. • The Y-D connection has no problem with third harmonic components due to circulating currents inD. It is also more stable to unbalanced loads since the D partially redistributes any imbalance that occurs. • The delta connected winding carries third harmonic current due to which potential of neutral point is stabilized. Some saving in cost of insulation is achieved if HV side is star connected. But in practice the HV side is normally connected in delta so that the three phase loads like motors and single phase lo...

• • DC Circuits • Single Phase AC Circuits • Three Phase AC Circuits • Electrical/Electronics App & Software • Electrical / Electronics Symbols • • Resistors • Capacitors • Inductance & Magnetism • Electrical / Electronics Symbols • Electrical Design • • Light Emitting Diode • Fun With LED’s • Renewable & Green Energy • Electrical Energy • Lighting • Search for • Switch skin Starting & Controlling of 3-Phase Motors Using Automatic Star-Delta Starter (Y-Δ) A Star-Delta starter is an electromechanical device used to start and control the speed of a three-phase induction motor. This starter employs the star-delta (Y-Δ) method for starting the motor, which involves changing the motor’s winding connection from a The Star-Delta starter includes a control circuit that typically consists of a timer, contactors, and overload relays. When the motor is started, it is initially connected in a Star configuration to reduce the starting current, which can be up to 6 times the motor’s full-load current. After the motor reaches a specific speed, the timer switches the winding connection to a Delta configuration to ensure the motor operates efficiently. This starter is widely used in industries where high-power motors are required, such as in oil and gas, mining, and manufacturing. The star-delta starter offers several advantages, including reduced starting current, better control of inrush current, and reduced stress on the motor windings during starting. However, it also has some disadvan...

Star and delta are two terms that are associated with how we connect electric motors. A motor is configured to one or the other so connecting the motor in the correct way is crucial to ensure that it operates with no issues. In this article, we will show you how to identify if a motor is connected in star or delta, where to find this, and also answer some faqs. Let’s start by taking a look at how to identify if a motor is wired in star or delta. How do you know if a motor is wired in star or delta? By looking inside the terminal box of a motor you can easily determine if the motor is wired in star or delta. The connections are located in the terminal box of the motor which is normally mounted on the body of the motor. The terminal box adds easy access to perform fault-finding exercises, electrical tests or when rewiring/repairing the motor. We will take a look at some images of motor termination boxes below that show what a motor would look like when connected in star and delta. Motor Terminal Box Wired in Star Below is an image that shows what the terminal box/wiring will look like if the motor is wired in the star configuration. Star Motor Terminal Connections As you can see, the motor connections are linked across the top of the terminal box and W2, U2 and V2 are all joined. Motors use metal plates to link the terminals which act as the components that link the connections together. Motor Terminal Box Wired in Delta Below is an image that shows what the terminal box/wir...

Difference between star and delta connection are explained considering various factors like the basic definition of the connections, the existence of a neutral point, the connection of the terminals, the relation between line current and phase current and also between line voltage and phase voltage, speed, its insulation level, number of turns, type of system and network usage, etc. The difference between the Star and Delta Connection are given below in the tabulated form. BASIS STAR CONNECTION DELTA CONNECTION Basic Definition The terminals of the three branches are connected to a common point. The network formed is known as Star Connection. The three branches of the network are connected in such a way that it forms a closed loop known as Delta Connection. Connection of terminals The starting and the finishing point that is the similar ends of the three coils are connected together. The end of each coil is connected to the starting point of the other coil that means the opposite terminals of the coils are connected together. Neutral point Neutral or the star point exists in the star connection. Neutral point does not exist in the delta connection. Relation between line and phase current Line current is equal to the Phase current. Line current is equal to root three times of the Phase Current. Relation between line and phase voltage Line voltage is equal to root three times of the Phase Voltage Line voltage is equal to the Phase voltage. Speed The Speed of the star connect...