CN202004400U - Cable terminal support arrangement structure - Google Patents

Abstract

The utility model 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. According to the technical solution provided by the utility model, 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 There is a lightning arrester and a cable terminal joint, and the distance L between the cable terminal joint and the lightning arrester is 1-1.5m. The cable terminal pole tower of the utility model 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 between the lightning arrester and the cable terminal joint is set at 1-1.5m, which can reduce the field strength distribution on the cable terminal joint , reduces the occupied land resources, good insulation effect, stable operation, safe and reliable.

Description

Layout structure of cable terminal tower

technical field

The utility model 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 utility model is to overcome the deficiencies in the prior art and provide a cable terminal tower layout structure, which has a simple and compact structure, easy installation and use, good insulation effect, stable operation, safety and reliability.

According to the technical solution provided by the utility model, 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 There is a lightning arrester and a cable terminal joint, and 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.

The utility model has the advantages: 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 at 1~1.5m, which can reduce the The field strength distribution reduces the occupied land resources, the insulation effect is good, the operation is stable, safe and reliable.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

Below in conjunction with specific accompanying drawing and embodiment the utility model is further described.

As shown in Figure 1: the utility model includes a tension insulator string 1, a cross-arm composite insulator 2, a lightning arrester 3, a wire fixing clamp 4, a line tower 5, a cable terminal joint 6, a grounding box 7, a protective sleeve 8, and a lightning 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. cable termination shaft tower arrangement comprises circuit tower (5) and is positioned at the cable termination shaft tower (11) of described circuit tower (5) one sides; It is characterized in that: described cable termination shaft tower (11) is provided with mounting panel (10), described mounting panel (10) is installed with lightning arrester (3) and tag (6), and the distance L between described tag (6) and lightning arrester (3) is 1 ~ 1.5m.

2. cable termination shaft tower arrangement according to claim 1 is characterized in that: described lightning arrester (3) is provided with arrester discharge counter (9).

3. cable termination shaft tower arrangement according to claim 1 is characterized in that: described lightning arrester (3) is the dropout type lightning arrester.

4. cable termination shaft tower arrangement according to claim 1 is characterized in that: described circuit tower (5) is provided with strain insulator string (1).

5. cable termination shaft tower arrangement according to claim 1, it is characterized in that: be installed with cross-arm formula synthetic insulator (2) on the described circuit tower (5), described cross-arm formula synthetic insulator (2) is provided with lead fixed wire clamp (4) corresponding to the other end that links to each other with circuit tower (5).

6. cable termination shaft tower arrangement according to claim 1 is characterized in that: described mounting panel (10) is provided with the terminal earth brace (12) that is used for tag (6) ground connection.

7. cable termination shaft tower arrangement according to claim 6 is characterized in that: described terminal earth brace (12) is provided with ground connection case (7) and protective sleeve (8).

Images