We have used variety of ATDs in OHE: Winch, 3 Pulley( Pulley ration 1: 3), 5 Pulley
For the sake of SS wire rope, 2 pulley was replaced by 3 pulley design.
Contact wire tension: 1000 Kg
Catenary Wire Tension: 1000 Kg
In tranway Type OHE, Tension: 1250 Kg
Weights suspended: 9 x 40 Kg + 2x 20 Kg = 400 Kg
So 666 Kg weight is suspended.
Purpose of equalising plate is to adjust in case of contact wire worn out.
normally we use XYZ value chart , but can do without it also, see how:
At 750 mts: 12.75 mm or 1/2 inch ( contraction or elongation)
say 800 , tension length at 40 deg
1.7x8 = 13.66 mm
13.6 x 5 = 68 mm
1250-68 = 1182 mm = Z
60 x 5 340
Y= 2500-340 = 2160 mm ( chart is not required)
Another option is this:
For the sake of SS wire rope, 2 pulley was replaced by 3 pulley design.
Contact wire tension: 1000 Kg
Catenary Wire Tension: 1000 Kg
In tranway Type OHE, Tension: 1250 Kg
Weights suspended: 9 x 40 Kg + 2x 20 Kg = 400 Kg
So 666 Kg weight is suspended.
At 750 mts: 12.75 mm or 1/2 inch ( contraction or elongation)
say 800 , tension length at 40 deg
1.7x8 = 13.66 mm
13.6 x 5 = 68 mm
1250-68 = 1182 mm = Z
60 x 5 340
Y= 2500-340 = 2160 mm ( chart is not required)
Another option is this:
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