why the undervoltage relay's interlock is used in earthswitch closing operation of the 400kV line scheme?

2 Answers  

---

Why neutral point is consider as zero potential?

0 Answers   Equate,

---

Why power factor should not be in leading (capacitive) mode of any load.

3 Answers   GE,

---

what is meant by motor startup supervision & motor load jam protection ?

0 Answers   ABB,

---

We use ungrounded DC system (220V/110V) for control and protection system in substations etc. Suppose we have long 2 core DC cables running from our DCDB in control room to the load (length of around 2 to 3 km). Do we need to protect these long DC cables from earth leakages or not? If yes how?

5 Answers   Siemens,

---

---

difference between crane drive and line drive.

0 Answers  

---

how to test generator protection rotor earth fault relay and locked rotor test?

1 Answers  

---

EXPLIAN THE IMPORTANCE OF POLY PHASE CIRCUIT.

0 Answers  

---

can we use CBCT in neutral of solidly grounded transformer? in place of three phases we can pass only one phase which decreases the size of CBCT?

0 Answers   UPSC,

---

After taking shutdown of 11kv feeder, if you see 5kv by phasing stick in the cable side, is it possible to close earth switch in cable.

0 Answers   KSEB, L&T, Siemens,

---

What is restricted earth fault protection ?

1 Answers  

---

WHY WE NEED AUTO TRANSFORMER,WHERE WE CAN USE?

5 Answers   L&T,

---