SU66548A1 - Antenna masts support insulator - Google Patents

Description

Masts are often used as antennas for broadcasting radio stations. Such a vertical antenna has significantly advantageous electrical indicators, not to mention cheapness and greater ease of operation due to the lack of the most emergency part in the form of an antenna network. However, the construction of free-standing insulated radio towers is hampered by the complexity of isolating the tower. The presence of large electrical voltages at the base of the tower leads to the need to install very large insulators, and this is due not only to the breakdown voltage, but also to dielectric losses, which increase with decreasing insulator. On the other hand, it is extremely difficult to manufacture a large porcelain insulator with large mechanical strength requirements. Difficulties in manufacturing insulators of large sizes make it necessary to divide the load on a group of insulators, and the result is a very cumbersome structure that requires a large amount of metal to support parts, mainly steel casting with great precision, since porcelain as a material is completely not resilient, requires accurate grinding to support metal plates.

The proposed support insulator is made not solid in height, but constituted of rings separated by metal spacers. In addition, the grounded support portion of the insulator is made in the form of a cone and forms the lower part of the hermetic casing. The mast support is insulated from the support part and fixed on the supporting ring with the help, and two cylinders made of dielectric material, more elastic than porcelain. The cylinders are made up of insulating discs, between which there are metal gaskets. With this design, a group of series-connected capacitors is obtained, on which the voltage should be distributed approximately evenly and, therefore, the question of the distribution of losses will be solved.

FIG. 1 shows a longitudinal section of an isolator; FIG. 2 shows a section along the lines LL and BB in FIG. one.

No. 66548

A metal ribbed plate 1 is fastened to the tower foundation, to which an iron pipe 2 is attached to the bolts by means of a flange, ending with a welded support ring 3 above. Above and below the support ring are assembled from 10-15 mm thick steel rings with two metal gaskets between the rings cylindrical insulators 4 and 5, which are fastened with a bolt 6 between plates 7 and 8. To the top plate 7, the leg of the tower is attached to the upper plate 7 by means of a small pipe with flanges. When the force on the bass is such that its foot is pressed against the foundation, the entire top insulator 4, which acts as a support, takes the entire load and transfers these forces through the support ring 3 and the metal pipe 2 to the foundation; the lower insulator is at this time released from the load. On the contrary, when the forces on the tower are such that they overturn it, and the leg of the bosom tends to detach from the foundation, all efforts are transmitted through the tightening bolt 6 to the lower insulator 5 and through it to the support ring 3 and the metal pipe 2, which is attached to the foundation and therefore does not allow the leg to detach. The force with which the bolt 6 is tightened must be slightly greater than the maximum force so that during a load change the force-free isolator does not turn out to be completely free and may begin to move or experience significant dynamic loads. The entire lower insulator and the inner surface of the upper insulator are formed in a hermetically sealed space that can be filled with oil. To place an upper insulator in the oil, a porcelain rubappa 9 is installed around it, which with the help of sealing flanges is attached to an iron pipe at the point where the tower leg is attached to the insulator. The fastening is done with a flexible diaphragm so that the porcelain shirt does not carry any mechanical load and serves only as a vessel for oil. As such a porcelain shirt, bushings of large bushings, which are made of glued together from individual rings, can be used. A shirt 9 is surrounded by a protective umbrella 10. At the upper part of the structure, a glass / tempered glass and a thermometer are installed, and a hole is made for the exit of gases. All spaces filled with oil are communicating with each other by openings to obtain porous circulation. The dimensions of the upper part of the insulator jacket are chosen depending on the amount of heat that must be removed.

All details of an insulator of this type are very simple and can be easily made, the bearing insulator itself is assembled from getinkace rings, which are machined from sheets of getinkix, and the strength of the insulator varies over a wide range by changing the size of the ring.

The use of insulators of the proposed type provides the following advantages: metal consumption is significantly reduced, there is considerable savings in the construction of the tower, good protection of the insulator from external damage, reduction of capacity to the ground, and losses due to a significant reduction in the size of the entire supporting structure and its insulating elements.

Subject invention

Claims (5)

1. Supporting insulator for antenna masts, etc., characterized in that, in order to reduce overall dimensions by increasing the breakdown voltage between the grounded supporting part and the mast support insulated from it, it is equipped with a hermetic casing consisting in the middle part of a dielectric and serving to prevent outside humid air from entering the insulation inside. 2. The form of the support insulator according to claim 1, wherein the grounded support part is made in the form of a cone and forms the lower part of the hermetic casing. The form of the support insulator on PP. 1-2, characterized in that the mast support is insulated from the support part and fixed on the carrier ring of the latter with the help of two cylinders of a more elastic, rather than porcelain, dielectric material (getinax, micalex) located one on top and the other on the bottom of the bearing ring and installed centrally located bolt. 4. The form of the support insulator according to claim 3, wherein the cylinders are in height composed of insulating discs, between which there are metal gaskets. 5. Application in the reference isolator on PP. 1-4 oil fill hermetically sealed with space cover. - 3 - № 66548 , fg .., Ji, i: i F //. /