Indian Railways QUESTION BANK : RDSO On OHE

Foreword Preface Contents Correction Slip

iii iv v vii

1.

ABBREVIATIONS & ELECTRICAL TERMS RELATED TO OHE

01

2.

25 KV AC TRACTION SYSTEM

06

3.

SPAN LENGTH, TENSION LENGTH

10

4.

WIND PRESSURE ON CONVENTIONAL OHE & SAG

12

5.

ENCUMBRANCE, GRADIENT OF THE CONTACT WIRE

14

6.

HEIGHT OF CONTACT WIRES, LEVEL CROSSING GATE

16

7.

DROPPERS & OTHER OHE CONDUCTORS

18

8.

STAGGER

23

9.

REGULATED/UNREGULATED OHE

26

10.

DIFFERENT OHE SYSTEMS, PRE SAG  AND ELASTICITY OF OHE

28

11.

OVERLAP AND NEUTRAL SECTION

32

12.

TURN OUTS & CROSSOVERS

36

13.

SECTION INSULATOR, 25 KV AC JUMPERS

39

14.

BRACKET ASSEMBLY

43

15.

ELECTRICAL CLEARANCES AND LIGHTNING ARRESTOR

46

16.

BONDING & EARTHING

48

17.

MAST, FABRICATED MAST AND PORTALS

51

18.

FOUNDATIONS

56

19.

IMPLANTATION

59

20.

OHE INSULATORS & CLASSIFICATION OF INSULATIONS AND VOLTAGES

60

21.

Over Dimension Consignment (ODC)

64

22.

AUTO TENSIONING DEVICE  (ATD)

66

23.

OHE MAINTENANCE

71

24.

MAINTENANCE BLOCKS & OHE BREAKDOWNS

74

25.

ELECTRICAL CROSSING OF THE RAILWAY TRACKS

77

26.

GENERAL, SAFETY RULES FOR OHE AND MEASURING TOOLS

81

ANSWERS

85

REFERENCES

91