An 11kv system consisting of an underground cable to a sub station about 300 meters away was shut down for about 10 hrs. On energising, it tripped off on earth fault about 10---20 mins later 6 times but since than it is not tripping.its already 3 weeks now. The SPAJ was found to be fine. what could be the cause.No test had been done to determine the cause of the trippings till now because of demand.

2 Answers  

---

Explain marx circuit.

0 Answers  

---

difference between earthing and grounding?

2 Answers   ABB, Bharti, L&T,

---

what is W.T?specify the acceptable range?

0 Answers  

---

if the voltage across the lamp drops by 1%, the power drawn will be reduced by how many %?

5 Answers   PSPCL,

---

---

when we have to purchase the transformer by own i.e how much load will preferred HT connection?

0 Answers   Power Square,

---

what is ten delta test? what is the significanse of it

1 Answers  

---

if grounding is notdone at regular intervals for long distance transmission, will the load connected at distribution end receive voltage during negativehalf cycle of the sine wave?

0 Answers   First City,

---

what is skin effect?

6 Answers   MPSEB,

---

fuel-air ratio in a petrol engine fitted with suction carburettor,operating with dirty air filter as compared to clean filter will be

0 Answers   NIC,

---

How to perform a DC resistance test In Alternator and their proceduces?

0 Answers  

---

What is diversity factor in electric installations?

0 Answers  

---