Answer Posted / arpit sood

one of the reason according to me should be that a motor
with star connection draws less starting current (5-8 times
less)
so if the motor is HV then there will be less voltage
fluctuation and less heating of the insulation of the motor
at starting
so the motor is better protected and does not start with a jerk


but generally the large motors are designed for delta
connection due to more mechanical power ( 3 times more than
the star connected) so there is need of auto transformer
starting

what is the use of the puls transformer in UPS & how it works???????????

2281

---

what is power factor ? how we can calculate the low power factor and amount of capacitor for improve that low factor ?

1683

---

how desiel generate sart fail of eb?

2256

---

As a electrical engineer.. what are the basic norms should follow in transformer oil testing.. 1.What is the Electrode type? 2.How long time you will give for oil testing?

3715

---

WHAT R THE SAFETIES IN A HIGH TENSION PANEL N LOW TENSION PANEL. ALSO WAT SAFETIES R THERE IN A 200 KVA TRANSFORMER?

2318

---

What Is HO factor in power selection

2124

---

who invented active elements? plz give me the complte details of active elements...

1905

---

How the capacitance og capacitor volatage transformer is decided?

2012

---

Why LED light has advantage of rapid reflection ,although other lights alse reflect.? and this light is considered to be best for transmission usage in case of Free optics

2104

---

This is urgent!! What is a Thyristor-based 3-ways selector switch with Zero crossing control? how does it operate and where is it mostly found in a system?

2116

---

can i connect wavetrap in 2 different phase in EHV line?

1920

---

What is dynamo?How it works and what is the function of dynamo in a DG.

2629

---

Dear Respected sir how to test ABB REX521 protection relay by relay tester.

2798

---

What are the disadvantages of autotransformer?

1165

---

whats the existence of reactive power and when it arises?

2173

---