Answer / vinoth

IR means Insulation Resistance. basically IR value need is ( Rated KV+1 ) Mohm.
For eg if motor rated voltage is 11Kv then we need IR value has 12Mohm.

Minimum 1Mohm is sufficient to start LT motors.

For HT Motor- ( Rated KV +1)Mohm

it is very suffient to start motors

Dear Sir, I willing to know if one 15Hp induction motor run in star connection. What happen power capacity of motor? Plz tell me.

1 Answers   Amtek Tekfor Automotive,

---

ple send to the how to improve the efficiency & economical to the thermal power plant

1 Answers  

---

in 3 phase (4 wire) star connection - is current pass through neutral??

7 Answers  

---

What should be the BDV value of a new transformer oil

3 Answers  

---

To have variable speeds we use a. Induction motor b. Traction motor c. Shunt motor

1 Answers  

---

power is the product of voltage and current.so we can measure the value of power just by using ammeter and voltmeter.......then why do we use a wattmeter?

5 Answers  

---

Whats parameters which we keep in mind when grounded any electrical machine.

1 Answers   Essar,

---

How to decide the fuse ratings for potential transformer

2 Answers   Eskom,

---

I have a 600VA UPS for computer only. It holds for 20minutes only. 1. Can it be upgraded for longer period.? 2. Can it be used for one ceiling fan and a tube light? If yes, how to upgrade?

11 Answers  

---

What do you mean by a current transformer?

0 Answers  

---

Why do we require transformer with less specific weight if supply frequency is increased?

0 Answers  

---

total numbers of earthing of a transformer

1 Answers  

---