Sag, wind and ice load, swing of insulator 1

[kalbur]

I'm looking for a metodology (basic equations) for calculating of sag, wind and ice load of insulator chain in case of strain conductors. How can I integrate it in calculations for conductor sag between the portals in a HV substation?

 

[bacon4life]

thread608-242026 gives a few references for the general sag equations.

The ASCE Substation structure guide references the general cable theorem (Norris and Wilbur 1960), "At any point on a cable acted upon by vertical loads, the product of the horizontal compent of cable tension and the vertical distance from that point to the cable cords equals the bending moment which would occur at that section, if the loads carried by the cable were acting on a pin-supported beam of the same span length as that of the cable"

Programs such as PLS-CADD can do finite element analysis to take into account point loads such as taps, markerballs and insulator bundles.

 

[Marmite]

Chapter 4 of the ABB Switchgear manual may be of assistance. Section 4.3.
Regards
Marmite

 

[jghrist]

I have made calculations assuming that the insulator strings are rigid and of uniform weight per unit length. See the attached calculations of distance between conductors. These show how I incorporated insulator sag into sag-tension calculations.