CS210951B1 - Insulating system under structures having low vertical clearance - Google Patents

Description

In rail transport, both the electrification and existing lines cause problems with the positioning of the overhead contact line under objects with low overhead height, or with an inappropriate contour line shape in the cross-section of the crossing object, e.g. honest flyovers, tunnels, etc. structures. In particular, as the speeds are increased, there is a reasonable assumption that a short-term swing of the overhead contact line or traction vehicle current collector causes parts of the overhead contact line to be approaching the crossing object or its transverse contour line at the risk distance. conditional jump generation.

In order to avoid the above-mentioned deficiency, solutions are known which cause damping of the movement of electrically live parts, as well as insulating systems, preventing the occurrence of a jump even when the electrically active parts are brought closer than prescribed. The disadvantage of known insulating systems based on insulating boards, resp. The elastic laminates are the instability of the metallial parameters due to climatic and operational influences, so that due to the necessity to prevent deformation, fixing of these systems requires special tensioning systems.

^The above mentioned drawbacks are eliminated by the insulating system under objects with low passage height, consisting of alternating layers of insulating and conductive, resp. semiconducting, according to the invention, which is based on a metal thatch.

In a practical embodiment on the base plate, the insulating system consists of alternating layers of insulating and conductive, resp. semiconducting, wherein the shape of each successive conductive, respectively. The semiconducting layer is graduated and selected with a view to a more favorable distribution of the electric field. Also, the accidental elimination quota is designed to insulate the electrical strength system in such a way that the full electrical potential can be directly connected to the conductive layers with sufficient breakdown safety.

With this operating state resolver, the focus of the insulation is moved into a practically separate system of solid dielectrics and an unstable dielectric - air layer with possible additions of steam or air pollutants. traction - is excluded from the system. In terms of quality stabilization, respectively. The reliability of the new solution brings higher effects than known solutions. Insulation layers with respect to compactness, self-support and strength of the base metal thatch can be made of proven materials, guaranteeing the stability of the parameters at a significantly longer service life than the known solutions.

In particular, electro-insulating asphalt, electro-insulating varnishes, including two-component bituminous materials, or other suitable compositions may be used. Conductive resp. the semiconducting layer may be formed by adding fillers to the aforementioned materials, by coating a colloidal metal solution, or by a metal foil. The entire system thus formed will be surface treated against atmospheric and climatic influences, also taking into account the need to maintain the surface cleanness of the insulation system, e.g. a suitable moisture-repellent coating, optionally combined with a glass fabric cover, etc.

Claims (2)

Insulation system below objects of low underpass height, insulating and conductive or semi-conductive, characterized in that it consists alternately of layers that is applied to a metal thatch.