CN102227077A - Tower arrangement structure at cable terminal - Google Patents

Abstract

The invention relates to a tower arrangement structure, and in particular relates to a tower arrangement structure at a cable terminal. The tower arrangement structure is used for improving the safety of the cable terminal, belonging to the technical field of electrical safety. The structure comprises a line tower and a cable terminal tower at one side of the line tower, wherein the cable terminal tower is provided with a mounting plate which is fixedly provided with an arrester and a cable terminal joint; the distance L between the cable terminal joint and the arrester is 1-1.5m, thus reducing the field intensity distribution on the cable terminal joint and decreasing the occupied land resources. The structure is good in effect and stable in operation, and is safe and reliable.

Description

Layout structure of cable terminal tower

technical field

The invention relates to a pole tower layout structure, in particular to a pole tower layout structure for a cable terminal, specifically a pole tower layout structure for improving the safety of a cable terminal, and belongs to the technical field of electric power safety.

Background technique

In recent years, the application of high-voltage cables of 110kV and above has risen sharply, and the number of cable accidents has also increased year by year. Many high-voltage cable accidents have occurred in many areas. The requirements for strengthening quality control and reducing cable failure rates are imminent.

At present, the design of cable lines mainly includes single loop, double loop, double split and double split double loop and other methods. The design methods of cable terminal layout in various ways are various. The spatial arrangement of various components such as lightning arresters and down-conductor connections has mutual influence on the electric field distribution, but this point has not been fully considered in previous designs. Theoretically and the analysis of the current actual operation in various regions, the spatial arrangement of each component is different, which not only directly affects the safe operation of each component, but also causes secondary damage to other components or the entire cable system when a component fails. injury.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a cable terminal pole tower layout structure, which is simple and compact in structure, easy to install and use, good insulation effect, stable in operation, safe and reliable.

According to the technical solution provided by the present invention, the arrangement structure of the cable terminal tower includes a line tower and a cable terminal tower located on one side of the line tower; the cable terminal tower is provided with a mounting plate, and the mounting plate is fixedly installed with The lightning arrester and the cable terminal joint, the distance L between the cable terminal joint and the lightning arrester is 1-1.5m.

The lightning arrester is provided with a lightning arrester discharge counter. The arrester is a tripping arrester. The line tower is provided with a string of strain insulators.

A cross-arm composite insulator is fixedly installed on the line tower, and the other end of the cross-arm composite insulator corresponding to the line tower is provided with a wire fixing clamp.

The mounting plate is provided with a terminal grounding rod for grounding the cable terminal joint. The terminal ground rod is provided with a ground box and a protective cover.

Advantages of the present invention: the cable terminal tower is provided with a mounting plate, and the lightning arrester and the cable terminal joint are fixedly installed on the mounting plate, and the distance L between the lightning arrester and the cable terminal joint is set to 1~1.5m, which can reduce the The distribution of field strength reduces the land resources occupied, the insulation effect is good, the operation is stable, safe and reliable.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Detailed ways

The present invention will be further described below in conjunction with specific drawings and embodiments.

As shown in Figure 1: the present invention includes tension insulator string 1, cross-arm composite insulator 2, arrester 3, wire fixing clamp 4, line tower 5, cable terminal joint 6, grounding box 7, protective cover 8, arrester discharge Counter 9, mounting plate 10, cable terminal pole tower 11 and terminal grounding pole 12.

Reliable operation of cable terminals must consider external insulation requirements, lightning protection requirements, mechanical performance requirements, and convenient repair and maintenance requirements. The main basis for external insulation performance is whether the arrangement meets corona discharge under dry and humid conditions; The main basis for the requirement is whether the arrester can effectively protect the cable terminal; the basis for the mechanical performance requirement is whether it meets the long-time working requirements. Under the premise of meeting these conditions, optimize the combination, so as to achieve the design and installation of the cable terminal under the premise of meeting the operating conditions , taking into account the requirements of occupying less land resources, improving the quality of installation, facilitating installation, repair and maintenance, and preventing theft and moisture.

As shown in Figure 1: the cable terminal tower 11 is located on one side of the line tower 5, the end of the cable terminal tower 11 is provided with a fixedly connected mounting plate 10, and the lightning arrester 3 and the lightning arrester 3 are fixedly installed on the mounting plate 10. The cable terminal joint 6, the distance L between the cable terminal joint 6 and the lightning arrester 3 is 1-1.5m, which can effectively reduce the occupation of land resources, and at the same time reduce the electric field intensity distribution on the cable terminal joint 6, and protect the circuit terminal joint 6 safe operation. Arrester 3 is provided with arrester discharge counter 9, in order to facilitate the maintenance of arrester 3, arrester 3 selects a tripping arrester.

The line tower 5 is provided with a tension insulator string 1, and a cross-arm composite insulator 2 is provided below the tension insulator string 1, and the tension insulator string 1 and the cross-arm composite insulator 2 are connected to the line tower. 5 fixed connections. The cross-arm composite insulator 2 is provided with a wire fixing clamp 4 corresponding to the other end connected to the line tower 5 . A terminal grounding rod 12 for grounding the cable terminal joint 6 is also provided on the cable terminal tower 11 , and the terminal grounding rod 12 is provided with a grounding box 7 and a protective cover 8 .

As shown in Figure 1: the distance relationship between the cable terminal joint 6 and the lightning arrester 3 is analyzed using finite element analysis software. The distance between the lightning arrester 3 and the arrester 3 is 2m, which can effectively reduce the occupied resources, and at the same time, can reduce the field intensity distribution of the cable terminal joint 6 . For specific implementation: add a voltage equalizing ring at the lead-out line of the cable terminal or expand the diameter of the lead-out wire shield; it is recommended that the arrester 3 be arranged on the side close to the lightning wave invasion, that is, when the lightning wave invades, it should be able to make the lightning wave arrive first On the arrester 3, the ground terminal of the arrester 3 should be grounded separately. It is not recommended to connect the arrester 3 to the outer sheath of the cable before grounding. In engineering practice, in the bustling area, it is recommended to use a composite jacket cable terminal considering that the porcelain sleeve will explode and hurt people when it breaks down. When the cable terminal body is fixed, if the site conditions permit, it should be kept in a straight line and avoid bending as much as possible. In addition, when designing and installing, ensure the quality of the foundation of the cable terminal tower, especially along the river, along the bridge, etc., so as to prevent sinking. Avoid oil leakage and crack defects caused by long-term stress at the tail of the cable terminal.

Claims (7)

1. A cable terminal tower layout structure, including a line tower (5) and a cable terminal tower (11) located on one side of the line tower (5); it is characterized in that: the cable terminal tower (11) is equipped with The installation plate (10), the installation plate (10) is fixedly installed with the lightning arrester (3) and the cable terminal joint (6), and the distance L between the cable terminal joint (6) and the lightning arrester (3) is 1~1.5m . 2. The cable terminal tower arrangement structure according to claim 1, characterized in that: the lightning arrester (3) is provided with a lightning arrester discharge counter (9). 3. The cable terminal tower arrangement structure according to claim 1, characterized in that: the lightning arrester (3) is a tripping lightning arrester. 4. The cable terminal tower layout structure according to claim 1, characterized in that: the line tower (5) is provided with a string of tension insulators (1). 5. The cable terminal tower layout structure according to claim 1, characterized in that: the line tower (5) is fixedly installed with a cross-arm composite insulator (2), and the cross-arm composite insulator (2) corresponds to The other end connected to the line tower (5) is provided with a wire fixing clamp (4). 6. The cable terminal tower arrangement structure according to claim 1, characterized in that: the installation plate (10) is provided with a terminal grounding rod (12) for grounding the cable terminal joint (6). 7. The cable terminal tower layout structure according to claim 6, characterized in that: the terminal grounding rod (12) is provided with a grounding box (7) and a protective cover (8).

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