Answer / ramarpandi

per unit impedance

I have two power supply.a)govt. power b)Captive power.3 phase load connected inside factory.when source change govt. source to captive some motor rotate reverse. Is phase sequence changes when if off & on?If I off generator & on it again is it possible to get changed phase sequence??

4 Answers   ABB,

---

which pole motor is best ?4 pole motor or 6 pole motor,why?

2 Answers  

---

What is the difference between expansion joints & thermal expansion joints in Bus bar

1 Answers  

---

what will be the minimum megger value for 132 Kv (earthed) potential transformer

3 Answers  

---

which type of motor is used in lift ?

7 Answers  

---

prove that inegration of { e^z / z^2 + pi^2 }dz is equal to i/pi by Cauchy Residue Theorem.

1 Answers  

---

what is meant by 2 within a star in a voltmeter dial?

0 Answers  

---

check list for anuval maintatince check list of oil transforms

2 Answers  

---

What is the difference between PS & metering CT (5p20,0.5 etc.)? Why in PS class CT only Vk is given ? Is PS class CT is more accurate than metering CT?

0 Answers  

---

How can claculate to attain the desired PF in the line ( HOW Much KVAR is required ) Pls Give the formula?

2 Answers  

---

Why we transmit the power at the voltage in the multiple of 11 or 1.1 like 11kv, 22kv, 66kv, 132kv...... some one told me that it is due to fomr factor 1.1 of sine wave. its fine but while transforming we can choose any voltage, so why only multiple of 1.1 there also.......? plz tell me.

7 Answers  

---

when a primary current injection test is required, it is accomplished by what?

3 Answers  

---