Answer / vinoth

In HT motors it will reduce the starting current up to 60 percent thats why we prefer star to delta conection..........but in LT motors we use Direct online starter/.......it doesnt reduce the starting current

Answer / madhu

The starting current for motors is 6 to 7 times full load current. So start-up power will be large if HT motors are delta connected. It may cause instability (voltage dip) in case small Power system. In starred HT motor starting current will be less compared to delta connected motor. So starting power is reduced. Starting torque will also be reduced. (It will not be a problem as motors are of high capacity.)

what does hapen if suddently frequency doubled

1 Answers  

---

What is the purpose of stablization resistor in high impedance bus bar protection

0 Answers   Jindal,

---

What are the various kind of cables used for transmission?

0 Answers  

---

why transformer ratings in kva?

99 Answers   Bhel, College School Exams Tests, DOW, Emco, Esab, GE, KCP, PGCVL, Sodexo, TCS, vtps, Wipro,

---

what is the purpose of ignitor in lighting fixer

1 Answers  

---

What is the feedback in the control system?

0 Answers  

---

why power factor is important?

6 Answers   Dalkia, MGC,

---

What is Harmonics how it is produced and what is the method to control the same

0 Answers   Siemens,

---

what is the voltage present in the telephone?

10 Answers   Infosys,

---

In CT, burden is 15 VA and protection 5P20,CT ratio is 100:1 then what would be the knee point voltage ?

2 Answers   ERL,

---

what is the minimum recommended leakage current of an earthed cable connected to the body or skid of an alternator

0 Answers  

---

how do you select the ct/pt rating in substation

1 Answers   Apollo, Shreem Electric Ltd, Tata Motors,

---