Mechanics of overhead electric lines split wires

V.I.Vanko, I.K.Marchevsky

Bauman Moscow State Technical University

2-nd, Bauman str., 5, Moscow, 105005, Russia

In this article develops the integrated approach to research of vibrations of the over-head lines (OHL) split phase (bundle conductor): the owing to kinematics assumptions split phase is considered as some hypothetical heavy thread which properties are defined by characteristics of wires and spacer-dampers, forming a phase.

In 1910 professor A.F. Mitkevich wrote: "Thus, it is necessary to state continuous growth of working tension on lines of electric energy transmissions. It is undoubtedly that application of the raised working tension imposes known conditions at a choice of wires diameter, to increase this diameter. Here we, of course, cannot go as much as far if we will adhere only to usual types wires which at rather small section would be equivalent to wires with very big section. One of many decisions of this problem consists in the following. The wire is made of a number of separate veins, being away one from another and located on some cylindrical surface as this surface forming.

Certainly, practically to carry out this sort of conductor, it is necessary to develop its design, i.e. it is necessary to develop and check up on experience a way of assemblage of such conductor, a way of its suspension manner etc. All it however does not represent, in my opinion, insuperable difficulties".

So there was an idea "to split" each current-carrying phase. In paper it was considered the alternating current over-head line with split phases and typical 4-wires bundle conductor; in avoidance of phase wires sticking the separate wires positions in space are fixed by installation spacer-dampers. Phase splitting has set for researchers a problem of account of aerodynamic interaction between phase wires. In offered work are studied the split phase vibrations as some mechanically equivalent wire movements; the way of arrangement spacers in a span is offered, allowing to maximize resistance to vibrations of "wires-spacers" system at the expense of use the spacers damping properties; the method of the split phase aerodynamically characteristics calculation and the way of Lyapunov stability estimation (both a single wire and the whole phase) are discussed. The given an account above investigations could be used for calculation of aerodynamic characteristics of atomic reactors cooling system tubes, multistoried buildings and structures subjected to aero- or hydrodynamic influences, perspective designing of overhead lines split phases etc.