Answer Posted / amit agrawal

star delta starter are used for controlling starting current. as we know, when we start any motor/pump then motor takes 6 times if rated current as there is no back emf ins tarting(speed zero).
If we apply star circuit then the voltage will be one third of delta circuit, in the same way current will be reduced.
This is the answer.
One more thing that all the HT(6.6KV) motors also be in star to control the starting current and to save the cost of insulation for both motor and connected cable.

What will happened if the neutral of secondary of Xformer ( Star point) Note it's above KVA rated Xformer

1893

---

what is value of Jin transformer

2100

---

what is acceptable leakage current for 33kv cable while doing high voltage test for cable? how to calaulate the leakage current for 33kv or any rated cable?

4039

---

What difference between ref protection and differential protection ?

1861

---

What is the permissable nutral current of three phase system as per IS standards?

2118

---

I need the list of Universities who have summer intake for BS degree in Electrical Engineering.?

2080

---

what is the purpose of high speed earth switch in gas insulated substat

2999

---

i have interview in Pepsi company what type of question will ask please send the question and answeer

3483

---

What are the advantages and disadvantages of short-pitched winding?

1099

---

if we run a 3 phase machine on two phase what will happend??? given answer with solid reason please

2101

---

what parameters should we check to reduce the power bill

2332

---

Power Factor Correction Panel (Manual & Automatic)

2233

---

H.t motor 6600 volt to same motor lt supply 440volt supply applyed to h.t motor to effect....

1895

---

why T/F winding temp measurement cts are odd secondary current ie,109A/1.2A/1.4A?

1870

---

What is meant by celling voltage & current in excitor ?

2089

---