Answer / sujeet pandey

there can transformers with 0 degree or 180 degree phase
displacement like in the case of star-star or delta-delta .
In case of star-delta or delta-star transformer there is a
phase difference of +30 or -30 degree depending on
connection b/w them.This phase difference is due to the
relation b/w phase voltage of primary winding and phase
voltage of secondary winding.

Answer / surendra

dy5 basaically suitable with respect to winding displacement
as need of 120 degree in space for obtaning pure revolving
flux. another reason is in this is pressure on winding will
be symetric...

Answer / srikant

i also faced it.....dont know

Is there is any hazard to insulation of 3hp motor 5 KV megger is used for it?

1 Answers  

---

What is the pro & con of having 11kv & 33kv incoming, and what is the adv & disadv. of converting from 11kv to 33kv.

0 Answers  

---

which connection is safer series or parallel?usually which connection we prefer at home?

5 Answers  

---

what are factors comes under relay setting (distance relay 7sa52) under OPEN DELTA VTs connection??

0 Answers  

---

Normally the starter used to reduce the starting current.but the dol starter do not it,so why we use it?

4 Answers  

---

In case of 3 phase motor why it is called single phasing by failure of one phare unless there is rest two phase are acting. ?

3 Answers  

---

For 35 HP motor how much amount of capacitor should be on in kvr to reduce the current bill

1 Answers  

---

What are the uses of stepper motor?

0 Answers  

---

for testing busbar (33kv) hi-pot .whether we can apply DC r not.and what is the test volt for that .explain

4 Answers   WGPSN,

---

how we can set the IDMT relay.

0 Answers   Suzlon,

---

When measuring the Insulation resistance of a motor winding (winding to earth) using a megger meter, Applied voltage(1000V) was automatically reduced to 500V. and the measured insulation resistance values are also very low (in Kohm range) Can anyone give me a reason???

3 Answers  

---

What is the unit of inertia constant of rotating machines? Which has more inertia constant between turboalternator and hydroaltermanor and why?

2 Answers  

---