RU2233493C1 - High-voltage pin-type line insulator - Google Patents

Abstract

FIELD: electrical engineering; wire connection in high-voltage lines.

SUBSTANCE: proposed insulator has insulating pin with inner cavity and part around outer surface of pin which is made of tracking-resistant material and provided with annular ribs. Mounted on upper and lower butt-ends of pin and ribbed part are upper and lower terminators, respectively. Butt-end surface of upper terminator is provided with slot to receive current conductor, and annular groove is made on its side surface to receive current-carrying fittings; lower terminator has central bore to receive spindle. Tightly fitted in inner space of pin is protective cylinder made of current-conducting material in the form of upside-down turned sleeve with central bore in bottom. Bottom edge of sleeve contacts lower terminator. Proposed insulator incorporates provision for protecting its inner surface against erosion and moisture.

EFFECT: enhanced service life and reliability of insulator due to enhanced mechanical strength and reduced leakage current.

5 cl, 1 dwg

Description

The invention relates to the field of electrical engineering and is intended for fastening wires in high voltage lines.

Known pin insulator made in the form of parts made of insulating material, consisting of a hollow conical base with a central hole for mounting the pin, the head in the form of a buckwheat sphere with an open groove for securing the wire and annular conical ribs located between the head and base (RU 16883 U1, cl H 01 B 17/20, 2001).

The closest in technical essence is a high-voltage pin linear insulator containing a rod of insulating material with an internal cavity and with an upper terminator, provided with a groove on the end surface for the current lead and an annular groove on the side surface for the current-carrying reinforcement, and a part with ring ribs covering the outer surface of the rod made of tracking-resistant material (RU 2170465, IPC ⁷ Н 01 В 17/20, 07/10/2001).

In the known device, the conductive coating is located on the outer surface of the external terminal. However, the inner surface of the rod is destroyed by erosion arising from the action of leakage currents.

The disadvantages of the known insulators are low life and lack of reliability due to low mechanical strength and erosion of the inner surface of the rod.

The objective of the invention is to increase the life of the insulator and its reliability by increasing mechanical strength, reducing leakage currents and protecting the inner cavity of the rod from erosion and moisture.

The task is achieved due to the fact that the high-voltage pin linear insulator containing a rod of insulating material with an internal cavity and with an upper terminal, and a part with ring ribs covering the outer surface of the rod, made of tracking-resistant material, is equipped with a protective shield mounted on the inner surface of the rod a cylinder of conductive material.

Private significant features is that the length of the glass may be related to the length of the rod from 1: 2 to 1: 5.

The upper end of the protective cylinder can be made in the form of a skirt, providing galvanic contact with the grounding pin, placed in the cavity of the rod.

The insulator can be equipped with a lower terminal installed on the lower ends of the rod and parts with annular ribs in contact with the lower edge of the glass.

The upper terminator can be made in the form of a separate part and mounted on the upper ends of the rod and parts with annular ribs.

The invention is illustrated in the drawing, which shows a General view of the insulator.

The insulator contains a rod 2 with an internal cavity, through a standard adapter cap 4 mounted on the pin 6. The outer surface of the rod covers part 5 with annular ribs, providing the necessary path length of the leakage currents.

At the ends of the rod 2 and part 5, the upper 1 and lower 3 terminators are installed. On the end surface of the terminal 1, a groove 7 is made to accommodate the current-carrying wire. On the side surface of the upper terminal 1, an annular groove 8 is made for the current-carrying reinforcement, for example, in the form of a wire knit securing the current-carrying wire to the insulator. The rod 2 is made of mechanically strong 3 material especially for bending and impact loads. Such materials include fiberglass with oriented fibers, fiber-filled thermoplastics, for example fiber-filled polybutylene terephthalate. A protective cylinder is made in the inner cavity of the rod 2 in its lower part without a gap, made of conductive material in the form of a glass 9 turned upside down with a central hole made in the form of a skirt 10. The glass 9 is pressed with its bottom against the base of cap 4 without a gap, and it the lower edge is flush with the lower end of the rod and is in contact with the lower terminal 3. The glass 9 can be pressed, welded or glued to the rod 2. In the lower terminal 3 there is a central hole for the installation of the pin 6. Skirt 10, the sleeve 9 provides galvanic contact with a pin 6.

Part 5 is made of leakage-resistant current, i.e. tracking resistant material (polymer).

Such materials include silicone rubber, materials of the class of polyolefins and their copolymers containing powdered mineral fillers.

The insulator works as follows.

The current-carrying wire is connected to metal fittings that fasten it to the insulator. The outer surface of the rod 2 is protected from erosion by leakage currents with part 5 with annular ribs providing the necessary path length of the leakage currents, and the inner surface of the rod 2 is protected from erosion by leakage currents and moisture by a glass 9 through which leakage currents flowing from the lower terminal to the grounding pin 6.

This ensures an increase in the life of the insulator and its reliability. The length of the glass is determined by the length of the rod.

It was found that the optimum ratio of the length of the glass to the length of the rod from 1: 2 to 1: 5.

For better galvanic contact of the lower terminal with the pin 6 can be installed screw 11.

Thus, the insulator allows you to withstand as much as possible any effect on bending, increases impact strength, eliminates the erosion of the inner surface by reducing leakage currents.

Claims (5)

1. A high-voltage pin linear insulator comprising a rod of insulating material with an internal cavity and with an upper terminal and a part with ring ribs covering the outer surface of the rod and made of tracking-resistant material, characterized in that a protective cylinder made of conductive material is installed on the inner surface of the rod without a gap . 2. The insulator according to claim 1, characterized in that the upper end of the protective cylinder is made in the form of a skirt designed for galvanic contact with the grounding pin. 3. The high voltage pin linear insulator according to claim 1, characterized in that the length of the protective cylinder refers to the length of the rod from 1: 2 to 1: 5. 4. The high-voltage pin linear insulator according to claim 1, characterized in that it is equipped with a lower terminal installed on the lower ends of the rod and parts with annular ribs, the lower end of the protective cylinder in contact with the lower terminal. 5. The high-voltage pin linear insulator according to claim 1, characterized in that the upper terminal is installed on the upper ends of the rod and parts with annular ribs.