Answer / rushi n. gajjar

dyn5 test of transformer in which some condition like U,V AND W. primary and sec. side we check
1U2W=1U2V;
1W2V<1W2W
1V2V=1V2W we found all this condition in dyn5 test.
dyn11 is vector diagram of 3 phase xmer phase difference 60 degree between R ND Y same way....

Answer / kobena wiredu

DYn means a delta-star connected transformer in which the primary is delta connected and the secondary is star connected. The number that follows tells us the position of the Red phase of secondary relative to the primary using the clock (primary Red phase at 12oclock).So Dyn11 means secondary is on the 11 oclock line and hence leads the primary by 30deg since anticlockwise is the convention.To convert from one DYn to the other you need to change both primary and secondary connections. You do this by drawing vector diagrams. By using vector diagrams i find that converting from Dyn11 to Dyn5 means: Change ABC to ACB and change abc to cba.

Answer / hemant dehariya

In DYN 11 & DYN 5 is DYN 11 is HV voltage is lead from LV by angle of 30 degree and in DYN 5 HV voltage leg fron LV voltage by 150 degree.we can change vector group from DYN 11 to DYN 5 by change primary winding connection of transformer.

How can two 3 phase transformers of same KVA and Voltage be connected in parallel?

0 Answers   Bernhard Schulte Shipmanagement,

---

What is a doble test

1 Answers   KPSC Karnataka Public Service Corporation,

---

How many types of DC current

2 Answers  

---

Greeting to all members, How to calculate spill current when we have different ratio CT and Class for REF(Low Imp) I have 500/1A 5P20 @line side n 400/1A CL.X @ Neutral.

0 Answers   DEWA,

---

Which machine u will prefer to use at where flameble gases are comming out & why?

1 Answers   NTPC,

---

---

Why are tertiary windings used in transformers?

2 Answers  

---

The Source internal resitanse Rs , When equal to Load resistance RL, the maximum transfered is of _____ % of input power?

2 Answers  

---

sir, in a industry present pf is 0.54 pf 25hp power is there its want improve 0.9 pf. which suitable capacity capacitor is suitable please inform me.

2 Answers  

---

If cvt is most advance & effective(economically & stability)so why not use instead of VT(11 kv & 33 kv)?

3 Answers  

---

Why more than 2.5 MVA distribution transformers (secondary is 440V)are not used in india.

1 Answers  

---

What is a unit of gravity (Battery)

9 Answers  

---

how many current required for hypo test

0 Answers  

---