Underground Cables

UNIT - IV

Chapter - 6

Underground Cables

Syllabus

Underground cables - Types of cables - Construction of single core and 3 core cables - Insulation Resistance-Potential Gradient - Capacitance of Single-core and 3 core cables - Grading ofcables - Power factor and heating of cables - DC cables.

Contents

6.1 Introduction .... may-12, .... Marks 10

6.2 Requirements of the Cables                 

6.3 General Construction of a Cable         

6.4 Types of Cables .... Dec.-11, .... Marks 16                      

6.5 Insulating Materials for Cables .... May-12, 17, Dec.-15, ... Marks 8

6.6 Insulation Resistance of a Cable .... Dec.-10,  .... Marks 4

6.7 Capacitance of a Single Core Cable ..... May-06, 18,        .... Dec., -05,13,15 .... Marks 8

6.8 Grading of Cables .... Dec.-04, 06, 09, 10,17

.... May-06, 07, 11, 13, 16 .... Marks 16

6.9 Capacitance of Three Core Cables        .... May-04, 17, Dec.-13,16 .... Marks 16

6.10 Heating of Cables           

6.11 Heat Flow in a Cable               

6.12 Current Rating of a Cable                  

6.13 Two Marks Questions with Answers