CN104269232A - Composite insulator V-shaped overhung string for overhead transmission line - Google Patents

Abstract

The invention discloses a V-shaped suspension string of composite insulators for overhead transmission lines, which is characterized in that it comprises a connecting plate (7), a suspension clamp (8) and a composite insulator string, and the angle α between the two composite insulator suspension strings is 80- 100°, the composite insulator string includes in order from the grounding end to the live end: U-shaped rings in the inner arc of the tower (1), ordinary U-shaped rings in the inner arc (2), extension rods (3), and 2 sets of ring-to-ring connections Inner arc U-shaped ring (2), ball-end hanging ring (4), ball socket, composite insulator with ball-end structure (5), W-shaped bowl-head hanging plate (6), 2 pairs of inner arcs connected by rings and rings The U-shaped ring (2), the inner arc U-shaped ring (2) is connected to the connecting plate (7), the invention enables the two strings in the V-shaped suspension string to rotate axially at ±10-20°, thereby preventing the composite insulator from Axial torsion occurs in the case of ice-covered dancing or hurricane, which destroys the mechanical strength of the mandrel and its end fittings, and also avoids the phenomenon of ball head and ball socket falling off under the condition of super-design wind speed.

Description

A V-shaped suspension string of composite insulators for overhead transmission lines

Technical field:

The invention relates to a V-shaped suspension string of composite insulators for 110-220kV overhead transmission lines, which belongs to the field of design, operation and maintenance of overhead transmission lines in power systems.

Background technique:

So far, the standard materials of the composite insulator V-shaped suspension strings of the State Grid Corporation of China for public bidding are all conventional types. When composite insulators are used in series, clamps should be installed on the periphery of the bowl head of the fittings to prevent the ball head from falling out of the ball socket caused by wind swaying. According to the report of the operating unit, the added clamp is easy to loosen after a long period of vibration; in addition, the additional clamp loses the connecting function of the ball head and the ball socket. Obviously, the assembly form of the V-shaped suspension string of composite insulators is not perfect.

Invention content:

The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a composite overhead transmission line that promotes uniform icing of the conductors, reduces the amplitude of galloping of the conductors, reduces mechanical loads and even brittle fractures, achieves a full life cycle, and operates safely and reliably. V-shaped hanging string of insulators.

The purpose of the present invention can be achieved through the following measures: a V-shaped suspension string of composite insulators for overhead transmission lines, which is characterized in that it includes connecting fittings and composite insulator strings, and the connecting fittings are composed of connecting plates and suspension clamps, and the connecting plates are respectively Connect a composite insulator string, the two composite insulator suspension strings are V-shaped, and the angle α is 80-100°, each composite insulator string includes a U-shaped ring in the inner arc of the tower, and the U-shaped ring in the inner arc of the tower connects the inner arc U-shaped ring, the inner arc U-shaped ring is connected to the extension tie rod, and the extension tie rod is connected to two sets of inner arc U-shaped rings connected by ring-ring, the inner arc U-shaped ring is connected to the ball-end hanging ring, and the ball-end hanging ring is connected to the composite insulator, composite The insulator is connected to the W-shaped bowl-head hanging plate, and the W-shaped bowl-head hanging plate is connected to 2 pairs of inner arc U-shaped rings connected by rings, and the inner arc U-shaped ring is connected to the connecting plate.

In order to further realize the purpose of the present invention, the connecting plate is a 3-hole connecting plate, and a single wire suspension clamp is hung on the lower end hole.

In order to further realize the purpose of the present invention, the connecting plate is a 4-hole rectangular connecting plate, and the lower end is hung with double-split wire suspension clips.

Compared with the prior art, the present invention can produce the following positive effects: the first of the present invention is to design two pairs of inner arc U-shaped rings connected by ring-ring at the live end, which solves the complicated phenomenon of force on the live end and avoids the over-design in the past Under the condition of wind speed, the ball head and the ball socket fall off; the second is that both ends of the composite insulator are connected with two pairs of inner arc U-shaped rings that are connected ring-to-ring, which can solve the phenomenon of torsion, mechanical load reduction and even brittle fracture of the core rod of the composite insulator , The third is that the end connection structure of the composite insulator does not affect the live replacement of the composite insulator. In the present invention, by changing the connection mode between the fittings, the two strings in the V-shaped suspension strings can rotate axially at ±10-20°, so as to avoid the axial twisting of the composite insulator in the case of ice-covered dancing or hurricane. It destroys the mechanical strength of the mandrel and its end fittings, and also avoids the phenomenon that the ball head and the ball socket fall off under the condition of super-design wind speed.

Description of drawings:

Fig. 1 is the structural representation of the first embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.

The specific embodiment: below in conjunction with accompanying drawing, the best embodiment of the present invention is described in detail:

Example 1: A V-shaped suspension string of composite insulators for overhead transmission lines (see Figure 1), which includes connecting fittings and composite insulator strings. The connecting fittings are composed of connecting plates 7 and suspension clamps 8. Hole connecting plate, hanging single conductor suspension clamp 8 in the lower end hole, the other two holes of connecting plate 7 are respectively connected with a composite insulator string, and the two composite insulator suspension strings are V-shaped, and its included angle α is 80～100 °. Each composite insulator string includes in order from the grounding end to the live end: 1 pair of inner arc U-rings of the tower 1, 1 pair of ordinary inner arc U-rings 2, 1 pair of extension rods 3, 2 pairs of inner arcs connected by rings Arc U-shaped ring 2, 1 pair of ball head hanging ring 4, ball socket, composite insulator with ball head structure 5, W-shaped bowl head hanging plate 6, 2 pairs of inner arc U-shaped rings connected by rings and rings 2, joint towers Inner arc U-shaped ring 1 is connected with inner arc U-shaped ring 2, inner arc U-shaped ring 2 is connected with extension rod 3, and extension rod 3 is connected with 2 pairs of inner arc U-shaped rings connected by rings and rings 2, inner arc U-shaped ring 2 Connect the ball-end hanging ring 4, the ball-end hanging ring 4 is connected to the composite insulator 5, the composite insulator 5 is connected to the W-shaped bowl-head hanging plate 6, and the W-shaped bowl-head hanging plate 6 is connected to 2 pairs of inner arc U-shaped rings connected by rings and rings 2. The inner arc U-shaped ring 2 is connected to the connecting plate 7.

Embodiment 2: A V-shaped suspension string of composite insulators for overhead transmission lines (see Figure 2), its structure is basically the same as that of Embodiment 1, the difference is that the connecting plate 7 is a rectangular connecting plate with 4 holes, and the lower end is hung with double-split conductors for hanging clamps 8.

Claims (3)

1. A V-shaped suspension string of composite insulators for overhead transmission lines, characterized in that it includes connecting fittings and composite insulator strings, the connecting fittings are composed of connecting plates (7) and suspension clamps (8), and the connecting plates (7) are respectively Connect a composite insulator string, the two composite insulator suspension strings are V-shaped, and the angle α is 80-100°, each composite insulator string includes a U-shaped ring (1) in the inner arc of the tower, and a U-shaped ring in the inner arc of the tower. (1) Connect the inner arc U-shaped ring (2), the inner arc U-shaped ring (2) connect the extension tie rod (3), extend the tie rod (3) connect the 2 pairs of inner arc U-shaped rings (2) connected by ring-ring , the inner arc U-shaped ring (2) is connected to the ball end hanging ring (4), the ball end hanging ring (4) is connected to the composite insulator (5), the composite insulator (5) is connected to the W-shaped bowl head hanging plate (6), W type Bowl head hanging plate (6) connects 2 pairs of inner arc U-shaped rings (2) that ring-ring joins, and inner arc U-shaped ring (2) connects connecting plate (7). 2. A V-shaped suspension string of composite insulators for overhead transmission lines according to claim 1, characterized in that the connecting plate (7) is a 3-hole connecting plate, and a single-conductor suspension clamp (8) is hung on the lower end hole. 3. A V-shaped suspension string of composite insulators for overhead transmission lines according to claim 1, characterized in that the connecting plate (7) is a rectangular connecting plate with 4 holes, and the lower end is hung with a double-split wire suspension clamp (8) .