Answer / bhavuk sharma

The semi conducting material is used in HV cables to reduce the stress caused on insulation due to high electric field.
This can be achieved by gradually reducing the electric stress. Now to gradually reduce this stress a layer of semi conducting material (since it is neither a complete insulator or a complete conductor) is used just before the main insulating compound of cable. This will reduce the electrical stress on this main insulating compound.

Answer / k.prakashchandra

The semiconductor layers are not doped and are intrinsic
.They influence(confine) electric field within the
insulation layers.

Answer / anil

The use of semiconductor layer in cable is
1. avoid air filled bubles and compete round structure for
insulation.
2. It influence the magnetic field inside the cable.

what is d meaning of inrush current of a trafo ? how u can calculate this ?

1 Answers   Jindal,

---

why do we carry out winding resistance test?

0 Answers   MahaGenco, MAHINDRA,

---

What is the differences in phase to phase voltages between star and delta connections of stator?

1 Answers  

---

The capacity of the transformer is 20/25 MVA, Ratio is 132/11 KV, Vactor group YNyno. and impedance is 10.07%. As per the calculation the secondary current is 1312.2Amps. The maximum fault current the transformer should sustain is 13.030KA. How many times the transformer should sustain the maximum short circuit current of 13.030KA over a period up 1 Year. The transformer is repaired one & 10 Years old.

1 Answers  

---

If two hack saw blades, seperated by 1mm thick paper,are connected across 230volts, and immersed in water,then they start getting heat. This is fact,i dont know how they get heated.Blades are not directly connected together. Please if anybody knows the fact ,revert back to me

3 Answers  

---

All the voltage drops and the source voltage added together in a series circuit is equal to

2 Answers  

---

why d.c motor speed decress with increass in load?

1 Answers  

---

Hello to all, Please someone can send me HPCL ELECTRICAL Engg. Sample papers to me? Its urjent....my email address is.... raviasiapacific@gmail.com

0 Answers   HPCL,

---

What is DPR relay, And what for??

2 Answers   Engro,

---

what is RTD? what is THERMOCOUPLE? What is difference between it?

2 Answers   Bhel,

---

length of 4 core cable 95mm from substation LV VFD panel to Motor at field approximately 150 meter. Motor stop and power has been isolated from LV MCC ( Substation )to disconnect Motor for services. After Motor completed service propose to reinstall and reconnect Motor Cable, found earth cable sparkling during touching at metal / motor body. Inspect by clamp meter found earth cable have current flow AC 1-2amps and all earth cable at MCC LV also have current flow as same value. why it is happen?

2 Answers  

---

what is the significance of positve n negative voltage regulation .on alternator

1 Answers   TCL,

---