METHOD OF THE OVERHEAD TRANSMISSION LINES SUPPORTS DYNAMIC TESTING Russian patent published in 2018 - IPC G01M5/00 

FIELD: construction.

SUBSTANCE: invention relates to energy sector construction, namely, to the overhead power lines supports dynamic testing method, which allows to determine the effect of dynamic loads, associated, for example, with wires breaks due to ice crust accidents or fatigue vibratory damage at the supporting clamp output, on supports strength and deformability. When implementing the method, a group of anchor section simulating supports are mounted on the bench, fixing to them the cable ropes with calibrated rupture inserts, dynamometers and tension springs built-in thereto, in which dependence between the spring tensile force and elongation corresponds to the dependence of the wire tension in the actual span on its elongation caused by the wire own weight and the ice crust weight load effect on the wire. Also installing the calibration weight, which weight is equal to the difference between the wire weight in the actual span and the cable tie-rod weight, with the built-in thereto calibrated rupture insert, dynamometer and tension spring, fixed in the span between two supports installed on the bench. Tensioning the cable tie-rods with the help of winches before rupturing one of the calibrated inserts, designed for the cable tie-rod minimum tension force, determined by the load from the wire own weight in the span. With the calibrated insert is rupture, determining the intermediate supports response to the impulse load impact, including the supports oscillations amplitude and natural frequency measurement by means of displacement sensors, as well as strain gauges determining the mechanical stresses at the support structures critical points during period of the impulse load impact on the supports. Next, repeating the described operations after additional loads fixing on the insulators, which weight corresponds to the ice crust weight with increasing thickness of its wall, including its maximum value, and taking into account the in the wire tension force increase in the span from the additional load increase onto it from the ice crust weight, increasing the calibrated insert rupture force value to the value corresponding to this additional load and the wire own weight.

EFFECT: technical result consists in providing dynamic tests of the supports single system joined by elastic mechanical connections made in the form of cable tie-rods with built-in tension springs simulating the real anchor section, to determine their dynamic characteristics both in the design conditions and in emergency conditions caused by the ice crust loads impacts exceeding the limit values, including the support structures destruction.

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