Questions tagged [y-to-delta]

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How do I use Norton's Theorem to find the current in this resistor? [closed]

I've been trying to solve this question but it seems impossible
1 vote
63 views

Can I solve Y-Δ circuit by converting it to Y-Y? Or do I need to solve it using Y-Δ formula?

Above is the picture of how I approach the 3(ii) question. My question is,which way is the correct way of finding line/phase currents/voltages? Why is the line/phase current different for each method? ...
45 views

Delta to star transform currents

When we transform a delta circuit to a star circuit it is easy to transform the voltages and the resistances. In the case of a delta circuit between current flows only between 2 nodes while in a ...
• 111
1 vote
38 views

□ -> X Conversion

In cicuit analasys to make a circuit easier you can use delta wye conversion. This means that when there part of a circuit with 3 nodes, where each of the 3 resistors ar in betwen 2 nodes, this can be ...
68 views

How can I show that there is no current over resistor

I made a contest question regarding find the entire current provide from voltage source 45V connected between a-c terminals. Follow the picture below: Original circuit My resolution I can made it ...
189 views

Which branches should I convert for this star-delta transformation?

For those who can't see the image: SO there is an outer delta with two 1 ohms and a 2 ohm. Then an inner Y with three 2 ohms. Within the Y, there is a delta formed on it's two lower legs with three 1 ...
96 views

Star to delta transformation circuit

Is it possible to use star-to-delta transformation on this specific circuit below? If it is possible, can someone give me a hint on how to do it? I tried to do delta-to-star transformation and got the ...
73 views

Wye to delta 3 phase

Can someone please explain to me the following. For the last part, why did they use the Van to find Vab( secondary line voltage of the delta). I did it and my magnitude matches the solution but the ...
• 31
485 views

Star-Delta starter connection of motors

The Star Delta Starter is a very common type of starter and is used extensively. It is said that a star delta is used for a cage motor designed to run normally on the delta connected stator winding. ...
105 views

I was trying to solve this problem (number 27) and as per the KCL equations I am getting that an infinite number of Ammeter readings are possible. I used KCL after taking the outer loop as the ...
• 337
987 views

what will happen if the motor that is designed for delta connected in star connection

I have a motor which is designed for 3 phase, 380V. The power rating of motor is 132kw and motor stator winding is connected in delta connection. If I connect the same motor stator winding in star ...
349 views

creating artifical neutral point in delta connection

I am trying to measure 3 phase 3wire and 3 phase 4 wire L_L voltage and L_N voltage.Circuit i am looking is common for both. In star connection i will get an neutral point for reference to read the ...
• 27
1k views

Balanced delta source to Wye source by considering magnitude only is ok?

I read and derived formulas for balanced delta source to Wye source; it is given by Vy = Vd / sqrt(3)<30 but in some places I see people only dividing by sqrt(3) for conversions are keeping angle 0,...
143 views

Proof that Delta and Y transformer have the same power?

I'm trying to proove that a Delta and Y transformer both have the same power. Somewhere I must get wrong in my process... I have a reading in voltage and current in a Star transformer: 600 V line-...
• 47
1 vote
180 views

How do I refer an impedance from the delta side of a transformer to the WYE side?

My question is regarding the simple arrangement below: It is simply a three phase source feeding a load through Z1, followed by an ideal WYE DELTA transformer, followed by Z2. My question is how do ...
• 91
1 vote
189 views

Y-Δ transform proof using superposition

In the Wikipedia page and in every book they prove the transformation by equaling the equivalent resistance between any pair of terminals while disconnecting the other node. https://en.wikipedia.org/...
• 11
1 vote
2k views

Does the motor speed change with the fully automatic star(wye)/delta starter?

At no load, I connected a 380V motor to start in the star connection for 5 seconds and thereafter change to the delta connection. I understand that torque will change since the current will change as ...
• 317
2k views

Running a 3ph motor rated for 380v star on 220v delta

I've got an old Soviet 4kW motor, made in 1983. The dilemma is that the nameplate info states a Y-connection/380v/8.7amps and I want to run it on delta using my VFD which produces 3ph 220v. All my ...
• 57
323 views

Why isn't there a $\small\sqrt 3$ factor between rated currents on the delta-wye transformer?

When calculating the rated current on either side of a delta-wye transformer, we will use the following equation: $$I_{LL}= \dfrac{S_{3\Phi}}{\sqrt 3\cdot V_{LL}}$$ Since this same equation is used ...
• 33
1 vote
640 views

How to Transform AC Current from Wye to Delta?

What is the correct formula to transform AC current from a Wye connection to a Delta connection? I am not an electrical engineer, and this is my first question on this part of StackExchange. I hope ...
• 113
42k views

Problem in star delta starter in air compressor

I am a beginner in electrical engineering. I am trying to understand how motors are connected in a star and delta system. I studied the star delta starter from this link. It describes the connection ...
• 791
1 vote
1k views

Resistance between the terminals of a star configuration?

The derivation of the delta-star transformation rules is based on the fact that the resistance between terminals 1,3 is R1+R3 I can't see how we can consider R1,R3 just two resistances connected in ...
• 11
204 views

3-Phase Theory vs Practical example confusion

In theoretical examples, 3-phase circuits are shown as either Wye or Delta type. Wye obviously containing a neutral line. Recently I watched a Youtube video where the uploader re-purposed an old ...
1 vote
152 views

Without converting the secondary side to "Y", how would one solve this question?

The question: "A three-phase 230 V, 27 kVA, 0.9 PF (lagging) load is supplied by three 10 kVA, 1330/230 V, 60 Hz transformers connected in Y-Δ by means of a common three-phase feeder whose impedance ...
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293 views

Y-Delta Transformation Voltage across resistor

In effort to solve for Vx, I would like to transform the Delta network (the 3 3 ohm resistors) to a Y network. My question is, where would Vx be read ? Thanks, Liam
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314 views

delta-wye with dependent sources

I was looking through some problems in Nilsson's book and this one caught my attention: The variable of the dependente source is in the $4\Omega$ resistor, which is part of a "delta" type of ...
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