Answer Posted / baswaraj

The power ratio between Star to Delta is 1:3

Here is the Explanation:

Let?s suppose Vs be the supply voltage per phase.

So the line voltage of the supply will be ?3Vs.

Now assume any type of load; for simplicity assume it a
only resistive load.

And let it be ?R? per phase.



For Delta connected load:



Calculation for per phase power; PD= I2R



Where I ? load current (per phase)

And,

I = ?3Vs/R {as line voltage of the supply is directly
applied to the phase of the delta load}

So,

Pd = (?3Vs/R )2R = 3Vs2/R watts per phase.

For 3 phases:

P3D = 3Pd = 3*3Vs2/R = 9Vs2/R watts.



Now for Star connected load:



PS = I2R = (Vs/R)2R = Vs2/R watts

For 3 phases: P3S = 3PS = 3 Vs2/R watts



Conclusion:

P3S / P3D = 3Vs2/R / 9Vs2/R = 1/.

hai iam arunkumar. i have applied for an section enginner in rrb. i want lat 5 years solved question papers. if u have please sedn it to arun30682@gmail.com

1812

---

What is stacking factor? What is its approximate value?

1423

---

send me all basic electrical question and answers

2904

---

What is grid collapse? what is the reason for it?

2117

---

What is Auto Mains Failure Panel & Auto Synchronizing Panel

1930

---

cc of scorpio?

2269

---

Anyone who can recommend an equivalent to Envirotemp FR3 of Cooper?

1954

---

The Howland current source produces a A Unidirectional floating load current B Bidirectional single-ended load current C Unidirectional single-ended load current D Bidirectional floating load current

2079

---

what is your aim

1908

---

which is the most advanced form of SF6 BREAKER?Can we use other gases to quench the arc?

2037

---

WHY THREE PHESE SYSTEM VOLTAGE APPLIED IN 440 VOLT

2332

---

What is effect of over voltage and under voltage on ACB

1951

---

Is it acceptable of installing an earth pit in planters area where bare copper cable, earth rod and connection are susceptible to corrosion due to water?

1944

---

Do closed loops systems require manual input?

1196

---

if a.c supply is given to the motor,, what happen?

2143

---