Light composite crossarm and pillar of solid insulators interruptedly filled in epoxy glass fiber tube

Abstract

The invention discloses a light composite crossarm and pillar of solid insulators interruptedly filled in an epoxy glass fiber tube. The product consists of an upper accessory 1, the epoxy glass fiber tube 2, a silicone rubber umbrella skirt 3, an insulated supporting plate 4, an insulated air bag 5, a filling insulator 6 and a lower accessory 7. The light composite crossarm and pillar has the following innovations: a, after the insulated supporting plate 4 is arranged in the epoxy glass fiber tube 2 and the insulator is filled in the epoxy glass fiber tube 2, inner wall leakage current and air breakdown of the epoxy glass fiber tube are blocked, no out-of-round deformation during bending stress of the epoxy glass fiber tube can also be supported, the rigidity of the product is increased, and the bending deformation is reduced; and b, the insulated air bag 5 is arranged in the epoxy glass fiber tube 2, so that the weight of the product is alleviated, the raw materials are saved, the cost is reduced, the out-of-round deformation can be transferred to the space inside the bag during the bending stress of the epoxy glass fiber tube; and meanwhile, due to fewer filler, the influence of the difference of two material dilatation coefficients on the product is reduced, and air gaps formed by poor interface and solid material tearing or deformation recovery are avoided.

Description

technical field [0001] The invention relates to the fields of high-voltage, ultra-high-voltage and ultra-high-voltage electric power, and is mainly used as an insulating cross arm of an iron tower of a transmission line and an insulating support of a substation. Background technique [0002] At present, high-voltage, ultra-high-voltage and ultra-high-voltage power transmission lines at home and abroad generally use steel cross-arms plus suspension insulators, and the insulating pillars widely used in substations are porcelain pillars. Steel cross-arms and suspension insulators increase the height of the iron tower and widen the line corridor. Porcelain pillars have poor antifouling and shockproof effects, are heavy, have high transportation costs, and are inconvenient to install. In recent years, some scientific research institutes and companies have developed several kinds of composite insulating pillars, all of which are not perfect, mainly because they have different def...

AI Technical Summary

Problems solved by technology

Porcelain pillars have poor anti-fouling and shock-proof effects, are heavy, have high transportation costs, and are inconvenient to install

In recent years, some scientific research institutes and companies have developed several kinds of composite insulating pillars, all of which are not perfect, mainly because they have different defects as mandrels bearing mechanical loads: 1. Extruded with epoxy glass fiber Rods are used as mandrels, but limited by the manufacturing process, it is impossible to produce extruded rods with a diameter greater than 130mm, and solid extruded rods have poor rigidity and large bending deformation; 2. The main disadvantage of using porcelain columns as mandrels is high manufacturing costs. The shock resistance is poor; 3. The epoxy glass fiber is wound outside the extruded solid rod, and the diameter of the mandrel is increased layer by layer. The main problem is the high cost and the air gap at the layered forming interface; 4. Filled with insulating gas, this product must be connected with an external barometer to monitor whether the gas in the tube leaks, which increases the maintenance workload of the operating department and is difficult for users to accept; 5. The epoxy glass fiber tube is filled with solid objects, such as the density of the filler If the filling is large, the weight will be heavy and the cost will be high; if the density of the filler is small, partial discharge may occur in long-term operation under high voltage and strong electric field

Moreover, the expansion and contraction coefficients of the filler and the epoxy glass fiber tube cannot be consistent, and the inconsistent size of thermal expansion and contraction will lead to tearing of the bonding interface

In addition, the filling with low density is difficult to withstand the extrusion force, and the insulating tube will be out of round and deformed when it bears the bending load, causing the filling to tear or not recover properly after being out of round after extrusion, forming an air gap and forming an internal insulation defect

Images