The support rod insulation design

 

(57) Abstract:

The invention relates to electrical engineering and for supporting insulating structures for high-voltage substations. The support rod insulating structure in the form of at least one element containing a supporting insulating monolithic rod, protective takingstock shell and metal end fittings that are installed on both ends of the above-mentioned rod. According to the invention bearing insulation monolithic rod is made of two insulating elements, axial and external, in the form of a sheath at the base of fiberglass and polymer binder, formed on the axial element. When the metallic end fittings are flanges, secured with an adjustable fit on the ends of the rod. The fitting side "of the earth", at least twice as long as the fitting from the side of the high voltage. The technical result from the use of the invention is that in this reference insulation achieves high mechanical strength against bending and torsion, high dielectric strength, reduced insulating structures, and are provided strictly definite is the first design in mechanical strength when bending has more than ten-fold margin of safety and can be used as supporting insulation, for example, the high voltage equipment circuit breakers, disconnectors, busbar supports and other 4 C.p. f-crystals, 1 Il.

The invention relates to electronics and concerns insulating support structures for high-voltage substations.

Such support rod insulation are usually porcelain rod with ribs and secured at the ends by means of a cement ligament metal flanges. The insulators are designed for insulation and support of live parts in the switchgear stations and substations and, in particular, are used as the reference rotary insulating elements, supporting conductor bus and knives disconnectors when operating in the open air.

The known reference-insulating structure in the form of a support post insulator containing bearing fiberglass rod with a unidirectional structure fiberglass protective ribbed trackinghistorical shell and metal end fittings (flanges), mounted on the rod by the method of volume reduction (Evidence of the Russian Federation N 5676, 1996).

The main disadvantages of this reference-insulating structure is its low mechanical characteristics the I temperature, that does not ensure reliable operation of high-voltage apparatus using such insulating structures.

Known insulating structure in the form of an insulator containing fiberglass casing formed in two directions, first along the body and a second transverse obtained by winding the impregnated fibers on the inner part of the housing. Trackinghistorical shell of injection moulded in the form of a fiberglass enclosure (PCT N WO 94/06127, H 01 B 17/06, 1993).

The main disadvantage of this facility is that the external part of the body is produced by winding resin-impregnated glass fiber in the axial part of the body. Such fiber winding practically does not change the strength of the composite rod bending and torsion, and these characteristics significantly depend on the temperature.

The known reference-insulating structure in the form of a support polymer insulator, which is used as supporting insulation of the high voltage equipment such as circuit breakers, disconnectors, busbar supports, etc. Insulator contains a rod of insulating material, for example from steklovata, impregnated with thermosetting compound, treningstudio rod and trackingstyle shell, and metal end fittings (RF Patent N 2074425, H 01 B 17/02, 27.02.97). This technical solution is the closest to the technical nature of the claimed and selected as a prototype.

The main disadvantage of this design is that it does not have a sufficiently high mechanical characteristics bending and torsion and significant dependence of the mechanical properties of the core temperature, which does not ensure reliable operation of high voltage equipment.

This circumstance requires the use of rods of large diameter, resulting in an insulator with a large lateral surface, which in turn leads to a decrease of the electrical characteristics. The use of large diameter rods requires massive flanges, which together leads to a large mass of the insulator and the high price.

The invention solves the problem of the creation of a support rod insulation for insulation and support of live parts in the switchgear stations and substations, which is used as a reference rotating insulating elements, supporting conductor bus and knives of plant disconnectors from the th strength, when reducing the dimensions of the insulation structures and strict certain height of the insulator and parallelism of the flanges of the end fittings.

To solve the problem stated support rod structure having at least one element containing a supporting insulating rod, protective trackinghistorical shell and metal end fittings that are installed on both ends of the insulator, which is proposed according to the present invention bearing insulation core to execute two insulating elements, axial in the form of a fiberglass rod and external in the form of a shell of glass-based glass and a polymeric binder formed on the axial element, the insulating elements in the form of monolith, protective treningslaila the casing is formed by a set of concentric rings, hermetically joined to each other and placed directly on the host terminal, and the metal end fittings are flanges with adjustable landing on the ends of the insulator by means of stoppers. Anchor rod design provides axial element made in the form of a rod with longitudinal rovings and the I. The fitting side "of the earth" must be at least twice as long as the fitting from the side of the high voltage.

The invention is illustrated in the drawing.

Declare the support rod insulation construction consists of a supporting rod which is formed of two insulating elements, the first axis is in the form of a fiberglass rod 1 and the second outer - shell 2 of the glass-based glass and a polymeric binder. The shell 2 is formed on the axial element in such a manner that forms a monolithic composite rod. The protective insulating treningslaila the casing is formed by a set of concentric rings 6 which are connected with end fittings 4 and 7 and to each other by a sealant, and is the protection of the core from atmospheric influences. The end fittings 4 and 7 are fixed on the ends of the rod with pins (stoppers) 5, which is also sealed. The end fittings 4 and 7 have flanges 3 for mounting them in the machines.

The insulator is made as follows.

The axial element in the form of a rod 1 made of fiberglass with a unidirectional structure of the fibers, fiberglass and fiberglass, pre is by winding around the rod 1 pre-impregnated polymer fiberglass and followed by curing. On the end part is made of a rod put on the bottom of the fitting 7, in which the center of the fixed terminal 2 and fix it with a pin 5. Formed in the cavity is placed first ring trackingstyle shell 6, and then produce a set of rings trackingstyle shell to the required size of the insulator. All joints between the rings and the tips are filled with sealant. Then put the upper fitting 4, which is fixed at the correct height pin 5.

The advantage of this invention is the significant reduction of the support structure by performing it out of fiberglass or fiberglass.

Composite structure carrying an insulating rod provides simultaneously high mechanical characteristics bending and torsion, low deformability, and a slight dependence of mechanical properties on temperature.

Free planting tips on the ends of the rod and securing them with pins and their subsequent sealing allows it to more accurately observe the dimensions of the insulator, and to carry out the Assembly of insulators of various sizes anywhere. The absence of a stress state of a terminal in a place zakrepleniye when combined mechanical load in the various support structures.

An additional advantage of the invention is the use of tips of different lengths (see drawing). The fitting side "of the earth" 7 should be not less than twice as long as the fitting from the side of the high voltage 4. This provides additional mechanical stability of the insulator and stable dielectric strength.

The tests showed a high mechanical strength in bending, and the loss of mechanical strength of complete destruction (fracture) occurs. The reference insulator 110 kV based on composite rod with a diameter of 76 mm has a mechanical bending strength 3.5 tons at a height of 1 m When residual mechanical strength is about 70% of the maximum mechanical strength.

Electrical testing facility show a stable discharge characteristics. The variation of the discharge voltage insulator when lightning pulses is not more than 1%, and the value of the withstand voltage of the insulator 110 kV is not less than 50 kV.

The economic effect is achieved due to the trouble-free operation of the busbar disconnectors and then, and no injuries since the fall of the insulators is excluded. the t of the building in repair during the day.

The test results disconnectors with such polymeric insulators confirm the possibility of their use as dividers operable under operational loads, and mechanical strength Flexural have more than ten-fold margin of safety that allows them to operate more than 50 years, taking into account the reduction of mechanical strength due to aging of polymeric material.

The inventive anchor rod design can be used as a reference isolation of the high voltage equipment circuit breakers, disconnectors, busbar supports and so on, especially in those types of devices, supporting insulation which is under high mechanical loads in the open air.

The use of such insulators as the basic insulation of high-voltage devices, such as isolators, will increase their reliability.

1. The support rod insulating structure in the form of at least one element containing a supporting insulating solid core with fiberglass, protective trackinghistorical shell and metal end fittings that are installed on both ends of the load bearing insulation monolithic rod, characterized t, ropicana polymeric binder, the metal end fittings are flanges, secured with an adjustable fit at the ends of the load bearing insulation monolithic rod by means of stoppers, and the fitting side "of the earth", at least twice as long as the fitting from the side of the high voltage.

2. The support rod insulation design by p. 1, characterized in that the axial element is designed in the form of a rod with longitudinal glass fiber.

3. The support rod insulation design by p. 1, characterized in that the axial element is made of fiberglass.

4. The support rod insulation design by p. 1, characterized in that the axial element is made of fiberglass.

5. The support rod insulation design under item 3 or 4, characterized in that the axial element of fiberglass or fiberglass pre-obtained by the extrusion method.

 

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