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Transmission is always done in Delta - so only three conductors are required. However distribution may have to supply three-phase OR single-phase loads, so a neutral connection is needed. This requires a wye or star connection on the secondary.
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∙ 14y ago
Wiki User
∙ 11y agoIn Delta connection, a neutral wire exist in conjunction with 3 phases. So one can easily connect a single phase load with one phase wire and neutral and three phase load can be directly connected across the three phases.
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Wiki User
∙ 11y agoThis type of connection is seem at the substation end where transmission line ends where voltage is to be stepped down. The ratio between secondary & primary voltage is 1/(√3) times the transformation ratio of the transformer.
In North America, a delta secondary is necessary because the residential 'split phase' system requires one of the 240-V secondary windings to be centre tapped in order to provide the 240/120 V service.
In Europe, a wye secondary is necessary in order to provide the 400/240 V service.
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∙ 10y agoIn Delta connected tertiary winding reduces Zero sequence impedance and allow adequate current for operation of protective device in order to limit voltage imbalance which may be produced when in balance in load.
Wiki User
∙ 11y agoto make path for harmonics hence the wave shpe will be sinosidual
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What types names of windings does the transformer have?
The primary winding is connected to the supply. The secondary winding is connected to the load. A tertiary winding (if used) is a third winding, which may be connected in various ways.If the transformer is a three-phase transformer, then there are three common configurations: wye (also known as 'star'), delta (also known as 'mesh'), and zig-zag.
Diagram of star-delta connection of motor?
Unfortunately, WikiAnswers does not support graphic images, so I will have to describe the connection in words. There are three windings, each with two wires. That is six connections. There are four connections in a star (wye) source, three hots and a neutral. The star connection has one end of all three windings connected (together) to neutral and the other ends connected to each hot. The delta connection has each winding connected end-to-end to each other in a ring, and each common point is connected to a hot. Neutral is not used in delta.
What will happen if induction motor is in star-star connected?
If a motor is connected in a star configuration it will operate at a slower speed. This is the working process that a star delta starter operates on. At first through the starter the motor starts in the star connection. When the motor gets up to its highest speed in that connection it times a timer out , the star starter drops out and the delta starter pulls in and then connects the motor in the delta connection. This allows more voltage to be applied to the motor and it then speeds up to its nameplate rated RPM.
How do you wire a 12 lead motor in star delta?
This is a 3-phase, dual-voltage motor. The 12 leads represent six different windings. For the higher voltage, pairs of windings are connected in series, then the three resulting pairs are connected into a delta configuration to tie to the power source. For the lower voltage, the pairs of windings are instead connected in parallel before combining them into the delta configuration. The windings MUST be combined in the proper order AND in the correct phase for it to work. Mistakes result in great quantities of smoke being released! Each of the leads should have a label, such as T1, T2, T3, etc. It will be either an adhesive label or sometimes printed in ink right on the wire. There is no standard labeling scheme, so each manufacturer always shows the connections for each voltage on the motor nameplate. There is no real way to guess at this, if the nameplate is missing contact the manufacturer for a diagram.
How many windings are in universal motor?
one windingAnswerA three-phase motor has three phase windings, normally (but not necessarily) connected in delta.
Is 3 phase star transformer has more winding than delta?
The # of windings in a transformer are based on the primary and secondary voltages the transformer is rated for not the way the windings are connected.
What types names of windings does the transformer have?
The primary winding is connected to the supply. The secondary winding is connected to the load. A tertiary winding (if used) is a third winding, which may be connected in various ways.If the transformer is a three-phase transformer, then there are three common configurations: wye (also known as 'star'), delta (also known as 'mesh'), and zig-zag.
Is a step up transformer a Ynd or a Dyn?
Whether a transformer is 'step up' or 'step down' has nothing to do with the way its windings are connected, so it could be wye-delta or delta-wye.
What is The Connection in three phase transformer?
the connection here meant for the connection of windings in three core or limbs of a transformer. it might be delta or star connected.
Diagram of star-delta connection of motor?
Unfortunately, WikiAnswers does not support graphic images, so I will have to describe the connection in words. There are three windings, each with two wires. That is six connections. There are four connections in a star (wye) source, three hots and a neutral. The star connection has one end of all three windings connected (together) to neutral and the other ends connected to each hot. The delta connection has each winding connected end-to-end to each other in a ring, and each common point is connected to a hot. Neutral is not used in delta.
What is the difference between a Delta-connected and a Y-connected transformer?
With three windings, you have six terminals. Call them A1, A2, B1, B2, C1, and C2, representing phase A, B, and C. In the delta configuration, A1 is connected to C2, C1 is connected to B2, and B1 is connected to A2. Power is from phase to phase - A1C2, C1B2, and B1A2. In the wye configuration, A2, B2, and C2 are connected together, and are usually connected to neutral. Power is from phase to neutral - A1, B1, and C1.
What will happen if induction motor is in star-star connected?
If a motor is connected in a star configuration it will operate at a slower speed. This is the working process that a star delta starter operates on. At first through the starter the motor starts in the star connection. When the motor gets up to its highest speed in that connection it times a timer out , the star starter drops out and the delta starter pulls in and then connects the motor in the delta connection. This allows more voltage to be applied to the motor and it then speeds up to its nameplate rated RPM.
How do you wire a 12 lead motor in star delta?
This is a 3-phase, dual-voltage motor. The 12 leads represent six different windings. For the higher voltage, pairs of windings are connected in series, then the three resulting pairs are connected into a delta configuration to tie to the power source. For the lower voltage, the pairs of windings are instead connected in parallel before combining them into the delta configuration. The windings MUST be combined in the proper order AND in the correct phase for it to work. Mistakes result in great quantities of smoke being released! Each of the leads should have a label, such as T1, T2, T3, etc. It will be either an adhesive label or sometimes printed in ink right on the wire. There is no standard labeling scheme, so each manufacturer always shows the connections for each voltage on the motor nameplate. There is no real way to guess at this, if the nameplate is missing contact the manufacturer for a diagram.
How many windings are in universal motor?
one windingAnswerA three-phase motor has three phase windings, normally (but not necessarily) connected in delta.
What are the problems associated with the three-phase transformer connection?
One must check the design of the transformer windings. STAR - Delta or Star to star or Delta - star or Delta Delta. Wiring must be done accordingly.
What are the connections on a transformer?
The connections on a transformer are circuit ties for the primary and secondary windings, and any taps. This is a very general question, and only a very general answer can be given. The basic transformer (outside the autoformer) has four connections, and two of them are for the ends of the primary windings, and two of them are for the ends of the scondary windings. Certainly there are many variations on the theme for taps in the primary and/or secondary, additional primary or secondary windings, different windings for different phases (as in power distribution applications), etc. More information on transformers can be had by using the link to the Wikipedia article on these electrical and electronic devices that are used to step up voltages, step down voltages, or isolate electrical circuits (as well as a number of other things).
What is an electrical star delta configuration?
A star configuration of the windings in a 3-phase transformer or motor is where one end of each winding is connected to form a star or 'Y' pattern and the other ends are each connected to one of the three separate lines of the incoming 3-phase electrical service.A delta configuration is when each phase winding of a three phase transformer or motor is connected to its two adjacent phase windings to form an arrangement that looks like the Greek letter delta - or triangle - and then each point of the triangle is connected to to one of the three separate lines of the incoming 3-phase electrical service.To be able to wire a 3-phase transformer or motor either in star or delta, all 6 ends of the three sets of coils, called "windings", have to be exposed with suitable connection terminals.The windings are often labelled A1, A2, A3 and B1, B2, B3, where "1", "2" and "3" denote the separate phase windings and "A" and "B" denote the beginning and end of each winding.Another way of describing it is to say that the separate windings can be labelled:Winding 1: A1 B1. Winding 2: A2 B2, Winding 3: A3 B3.In star configuration either all the A's or all the B's are connected together and the 3-phase supply (consisting of three separate "phase lines" labelled L1, L2, L3) is connected to the remaining three connectors. For example, if you connect B1 to B2 and B2 to B3 to form the center of the "star" then you must connect supply L1 to A1; supply L2 to A2 and supply L3 to A3.In delta configuration, connect B1 to A2, B2 to A3, B3 to A1. (If you draw that out as a schematic diagram, it will be a triangle.) Then connect supply L1 to A1; supply L2 to A2 and supply L3 to A3. (Exactly the same as the supply lines were connected before, for the star configuration.)For more information see the answers to the Related Questions shown below.
