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  

---

Hi,iam a diploma in electrical engineering.rtd from indian air force in apr 2007.prsently working in reliance next link as a network maintenance engineer since 2007,can i get a job in motherson sumi.

1 Answers   Motherson, Motherson Molds and Diecasting Ltd.,

---

what should be the resistance valve of healthy earth pit

1 Answers   Reddy Labs,

---

WHAT IS THE HIGHEST UNDERGROUND TRANSMISSION VOLTAGE IN THE WORLD?

3 Answers   Power Grid,

---

EXPLAIN THE FOLLWING: (1) BANDWIDTH (2) SELECTIVITY (3) RESONANT FREQUENCY (4) CURRENT MAGNIFICATION

1 Answers  

---

Tell me about Tesla.

1 Answers   Tata Power,

---

how a generating station can monitor its multi users power factor. What type of incentive /penalty is associated with power factor management.

1 Answers   Sojex,

---

In a flange coupling, the flange bolts are designed for

1 Answers   Caterpillar,

---

why can the rotor of 3 phase slip ring induction motor not be a 2 phase rotor?

1 Answers  

---

Can XLPE/SWB/PVC (P3) 7C X 2.5mm2 be replaced by Can XLPE/SWB/PVC (P2) 7C X 2.5mm2??? P3 vs P2

1 Answers   PCSB,

---

Difference between auxliary relay & pla relay

1 Answers   Reddy Labs,

---

one KVAR takes how much amps, and how to add power capacitors to electrical panels, for example if one of the MCC drawn 800amps means how much KVAR required

1 Answers  

---