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Questions tagged [y-to-delta]

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1answer
14 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,...
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0answers
24 views

Three-phase circuit with line impedance

I'm having some trouble with the first part of an exercise. If I only have V1, and Zl, how can I find what the line voltage V2 is equal to? So that, then I could calculate the phase currents A1,A2,A3....
3
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1answer
52 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-...
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0answers
43 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 ...
0
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1answer
76 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/...
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1answer
192 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 ...
2
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1answer
454 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 ...
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2answers
94 views

Why there is not a 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: $$ I_{LL}= \dfrac{S_{3\Phi}}{\sqrt3*V_{LL}} $$ Since this same equation is used for ...
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1answer
155 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 ...
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1answer
19k 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 ...
1
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1answer
556 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 ...
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0answers
208 views

Using MOSFETs to switch delta to wye winding in a BLDC motor

I'm looking to make an "electronic transmission" of sorts, by making essentially a 3pdt switch from MOSFETs, which will switch the winding configuration from Delta to Wye when a certain RPM is reached....
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1answer
122 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 ...
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0answers
97 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 ...
0
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1answer
189 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
0
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1answer
148 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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2answers
1k views

Y to Delta transform with inductors?

Does a Y to delta transform for resistors work the same way when inductors a connected in a similar fashion? simulate this circuit – Schematic created using CircuitLab I have a load bank that ...