摘要:
Suspension device for aerial cables (CA) hung from one of the cables (LD) of an existing electric power line, whereby the suspension device establishes a separation between the aerial cable (CA) to be laid and the cable (LD) of the electric power line already laid. This device consists of a single piece in the form of a clamp, the extremities of which are of different lengths and bent back on each other so as to overlap, and which holds both cables (CA,LD) on its inside. Suspension device of special application for serial optical fibre communications cables, which are hung from a cable of an electric power line which has not ground wire.
摘要:
Method for the application of a wire system consisting of a mechanical support wire or wires and current conducting wires for power transmission lines comprising steps of attaching mechanical support wires on support structures of the transmission line directly or by means of insulators and joining separate current conducting wires to the mechanical support wires applying spacers and/or insulators. The cross-sectional area of current conducting wires is chosen to ensure that with current conducting wires loaded with their rated current and with the ambient temperature being 30 ° C, the temperature of said current conducting wires is greater than 80 ° C but does not exceed 300 ° C. According to the inventive method, the support wire is implemented as a ground wire. For reducing the tensile stress of existing phase conductor wires that according to the invention are functioning as current conducting wires, support wires are installed such that support wires and existing phase conductor wires are tensioned, taking into account the ambient temperature, to a degree that the tensile stress to which the current conducting wires are subjected is reduced by at least 20%.
摘要:
Suspension device for aerial cables (CA) hung from one of the cables (LD) of an existing electric power line, whereby the suspension device establishes a separation between the aerial cable (CA) to be laid and the cable (LD) of the electric power line already laid. This device consists of a single piece in the form of a clamp, the extremities of which are of different lengths and bent back on each other so as to overlap, and which holds both cables (CA,LD) on its inside. Suspension device of special application for serial optical fibre communications cables, which are hung from a cable of an electric power line which has not ground wire.
摘要:
The invention concerns a method of fitting an optical-fibre cable (1) on the cable (2) of a power transmission line using at least one adhesive tape (5, 6) wound on in a helical manner.
摘要:
An overhead transmission cable having a high capacity and a low slackening tendency is proposed. The cable has a conductor and a tension member connected together by means of a connecting member so as to extend parallel to and so as not to contact each other. The tension member may be formed of iron, titanium, aluminum or an alloy thereof, formed by braiding or twisting organic fibers and yarns, or may be formed from a composite of at least one of an organic material and an inorganic material and at least one of a metal and a resin. Tension is applied to the tension member. Since the heat generated in the conductor is never conducted to the tension member, the tension member hardly slackens. Thus, it is possible to increase the capacity of the cable without increasing the sectional area of the conductor. Since both the tension member and the conductor are lighter in weight, there is no need to pull the cable with a large force.