CN201163549Y - A controllable temperature rise steel core aluminum stranded wire - Google Patents

Abstract

The utility model provides a steel-cored aluminum stranded wire with controllable temperature rise. The steel-cored aluminum stranded wire comprises an outermost layer of twisted aluminum wires (1), and the conductors of the second outer layer are provided with an outer-wrapped insulating layer (2). It has the advantages of simple structure, low cost, and convenient temperature control, which solves the phenomenon of ice coating on wires caused by freezing rain and other reasons; and the utility model puts the insulating layer on the second outer layer of the wire, which can prevent the insulation material from being damaged by sunshine and other reasons. The aging and deformation caused by it will reduce the service life of the wire; in addition, when the staff is installing in the field, they often drag the wire, and putting the insulation layer on the sub-outer layer of the wire can also prevent the insulation layer from being damaged due to dragging.

Description

A controllable temperature rise steel core aluminum stranded wire

technical field

The utility model relates to an aluminum-steel stranded wire, in particular to an aluminum-steel stranded wire which can control temperature rise.

Background technique

In Guizhou, Hunan, Jiangxi, Sichuan and other places, winter is often accompanied by freezing rain, and the freezing rain falls on wires, branches, and the ground, and then forms a thin layer of smooth ice. Freezing while flowing, the result is a series of stalactite-like icicles and ice spikes. When its weight exceeds the carrying capacity of the object, it will bring great harm to electricity, transportation, and agriculture. Among them, after the wires are frozen, they will shrink when they are cold, and under the influence of the weight of freezing rain, they will be broken; sometimes, rows of utility poles and iron towers are even pulled down, interrupting telecommunications and power transmission.

In 1955, hundreds of electric poles were collapsed in the Zhejiang-Jiangxi area due to the collapse of scales, and the railway transportation between Nanxun and Zhejiang-Jiangxi was once interrupted; in November 1987 and December 1989, in the southwestern region of the former Soviet Union, a scale collapsed , Overturning nearly 10,000 poles, causing large-scale telecommunications interruption. At the end of February 1972, a large-scale freezing rain occurred in my country, and the telecommunications from Guangzhou, Changsha, Nanjing, Kunming, Chongqing, Chengdu, Guiyang and other places to Beijing were once interrupted, causing extremely serious economic losses. In mid-to-late January 1984, affected by strong cold air, freezing rain occurred in many areas in Guizhou, Hunan, Jiangxi, Hubei and other provinces, causing wires to break and poles to fall. All wired telephones in Guizhou Province were cut off, seriously affecting communication work. The thickness of ice accumulated on transmission lines in Hunan is more than 20 millimeters, and some high-voltage lines melt ice 56 times a day. The freezing rain in the winter of 2007 caused power facilities and lines in most areas south of the Yangtze River to be covered with ice, which led to power interruptions, and the situation in Guizhou was particularly serious.

In order to prevent freezing rain from causing harm to power facilities and lines, it is necessary to de-ice the wires. In the past, there were mainly three methods for deicing high-voltage lines. One is to create an artificial short circuit that heats up the wires to remove the ice, but this method can only be used to deal with less severe icing conditions, and this method will also cause the collapse of the power system. The other is to manually de-ice the frozen power grid. At present, the most commonly used method is that electric workers hold wooden sticks, iron wrenches or rubber sticks to knock on the frozen power grid to "reduce the burden" on the power grid. This kind of method not only wastes manpower but also has great danger. The third method is an unconventional method, that is, in Sichuan, Guizhou and other places, at nodes that electric workers cannot reach, armed police soldiers shoot at the icicles attached to the power grid.

In the prior art, Chinese patent 03278434.1 discloses a wind and snow resistant cable, which improves the wind and snow resistance of the power grid in northern my country to a certain extent, but is not suitable for the power brought by freezing rain in the south of my country. Icing disasters of facilities and lines.

Utility model content

The technical problem to be solved by the utility model is to provide a controllable heating steel core aluminum stranded wire, and the second outer layer of the wire has an outsourcing insulation layer, which can well solve the problem of wire icing caused by freezing rain in some parts of southern my country. Phenomenon.

In order to solve the above problems, the technical solution adopted by the utility model is to provide a controllable temperature-raising aluminum cored wire, which includes the outermost layer of twisted aluminum wire layer 1, and the second outer layer of wire Insulation layer 2, inside is steel core, expanded steel core or steel-aluminum mixed stranded wire, etc.

The second outer layer is composed of several metal wires, wherein the outer layer of each metal wire is wrapped with an insulating layer 2 . The material of the metal wire can be aluminum, copper, silver, iron and other metals and their alloys, among which aluminum is the most preferred, with low cost, small weight, convenient processing and application, and the same electrical conductivity as the outer stranded aluminum layer.

The second outer layer is wrapped in the insulating layer 2.

The material of the insulating layer 2 is insulating varnish, insulating resin, insulating rubber, insulating paint or insulating plastic.

Instructions:

In the controllable temperature-raising aluminum stranded wire provided by the utility model, the second outer layer of the wire has an insulating layer, and the second outer layer has two structures. The structure (1) is formed by arranging each metal wire wrapped with an insulating layer. (2) It is that the second outer layer is wrapped in the insulating layer. For structure (1), when winter comes and the wires are covered with ice due to freezing rain and other reasons, the power transmission end is adjusted so that the current only passes through the metal wires wrapped in the insulating layer in the second outer layer. , the resistance increases, when the transmission current is constant, it can be seen from Joule's law that the heat released by the wire itself increases, so that the ice on the wire will not be formed quickly due to the heat or the ice on the wire will be formed The icing melts in time, thereby overcoming the loss caused by the icing of the wires. The structure (2) adjusts the power transmission end so that the current only passes through the outermost layer of twisted aluminum wire, which increases the heat released by the wire itself, so that the icing falling on the wire does not form ice quickly due to the heat. Or the ice coating on the electric wire can be melted in time, and the loss caused by the falling of the pole and the tower due to the ice coating of the electric wire can be overcome.

Compared with structure (two), structure (one) has complex structure and high cost; but structure (one) has more advantages than structure (two). On the one hand, structure (1) can also achieve the effect of structure (2) when only the outermost twisted aluminum wire layer is energized; on the other hand, structure (1) can also purposely adjust the secondary outer layer The number of metal wires with an insulating layer can change the resistance value to achieve the effect of temperature control. Among them, structure (2) has only two resistance values, which is generally only suitable for long-distance wires, and short-distance wires will cause short-circuit and burn the engine; while structure (1) is suitable for both long-distance power transmission lines and short-distance When a very long transmission line is only covered with ice on high mountains, the distance of the wires that need to be melted is relatively short, then adjust the number of current-carrying wires in the metal insulation layer, change the resistance value, and avoid wires that are not covered with ice It also ages and deforms with heat.

Compared with the prior art, the controllable heating-up steel-cored aluminum stranded wire provided by the utility model has simple structure, low cost, and convenient temperature-raising control, which well solves the phenomenon of wire icing caused by freezing rain and other reasons; and the utility model The new type puts the insulation layer on the sub-outer layer of the wire, which can avoid the aging and deformation of the insulation material due to sunlight and other reasons, and reduce the service life of the wire; in addition, when the staff installs in the field, they often drag the wire and put the insulation layer on the wire. The second outer layer can also prevent the insulation layer from being damaged due to dragging.

Description of drawings

Fig. 1 is the schematic diagram of structure (1) of the present utility model;

Fig. 2 is the schematic diagram of structure (two) of the present utility model.

Detailed ways

Embodiment 1: As shown in Figure 1, the controllable heating steel-cored aluminum stranded wire, its outermost layer is a twisted aluminum wire layer 1, and the wire of the second outer layer has an outer insulation layer 2; the second outer layer is made of several aluminum metal wires Composition, in which the outer layer of each aluminum conductor is wrapped with a cross-linked polyethylene insulating layer 2.

Embodiment 2: As shown in Figure 2, the controllable heating steel cored aluminum stranded wire, its outermost layer is the twisted aluminum wire layer 1, and the conductor of the second outer layer has an outer insulation layer 2; the insulation layer 2 is cross-linked polyethylene insulation layer.

Claims (5)

1. A steel-cored aluminum stranded wire with controllable temperature rise, the outermost layer of the steel-cored aluminum stranded wire is a twisted aluminum wire layer (1), characterized in that: the conductor of the second outer layer has an outer-wrapped insulating layer (2). 2. The controllable heating aluminum steel cored wire according to claim 1, characterized in that: the secondary outer layer is composed of several metal wires, wherein the outer layer of each metal wire is wrapped with an insulating layer (2). 3. The controllable heating aluminum steel cored wire according to claim 1, characterized in that: the secondary outer layer is wrapped in the insulating layer (2). 4. The controllable heating aluminum steel cored wire according to claim 1, 2 or 3, characterized in that: the insulating layer (2) is made of insulating varnish, insulating resin, insulating rubber, insulating paint or insulating plastic. 5. The controllable heating aluminum steel cored wire according to claim 2, characterized in that: the material of the metal wire is aluminum.

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