Answer Posted / bhavana

150kv

How to calculate the size of earth cable to earth the neutral of UPS ?

1878

---

The series field winding has low resistance while the shunt field winding has high resistance. Why?

1667

---

What is the rating factor for copper cable ( Specific value according to the type of laying ) & the voltage drop?

1809

---

stand by earth fault protection (51G) for transformer rating 2000 kVA,Dyn11,33/0.400 V. LV NCT ratio and necessary resistor and metrosil values how to calculate

2748

---

what is the difference between switch yard to residential area.and how much required it.

1700

---

what is the need to express current and voltage in rms value? rms value is also called as effective value,what is effective value?

1894

---

i am an maintenance engineer. one distribution board have 5 feeder. recently its ELR trips frequently, but it take some times after trip( 10min,20min..)but 3 feeder no load. two feeder only loaded. i checked one feeder IR value all values are above 50Mohm.but B phase to Earth is only 9Mohm.any problem about low value

1872

---

what does a string of resistors in a series will do?

1172

---

I am getting above 60 V as open delta voltage against single phase unit ICT at tertiary delta formed and ICT getting trippped on NDR. ICT tested and found in order. PTs provided on tertiary are tested and in order. what may be the reason?

1808

---

How does zener phenomenon differ from avalanche breakdown?

1103

---

if 6 earth pit value is 1.5 ohm then what should be the number of earth pit to make the value .8 ohm

2159

---

Why induction motor is widely used in industry

2693

---

what is the IS foe lightning arrester?

2115

---

Explain what are inter-poles and why they are required in a dc machine.

1037

---

In three pin plug 6 amp. 220V ac rating. Why earth pin diameter is higher than other two pin? What its purpose ?

1171

---