CN207847235U - No ground pole DC transmission line line pole tower - Google Patents

Abstract

The utility model discloses a kind of no ground pole DC transmission line line pole towers, are related to a kind of structure of electric wire line pole tower.It includes tower body, polar conductor cross-arm and metallic return cross-arm, and polar conductor cross-arm and the tie point of tower body lower end are the first tie point, and polar conductor cross-arm lower end is provided with polar conductor insulator chain；Polar conductor insulator chain is V-shaped, and one end of polar conductor insulator chain is connect with tie point, and the other end is connect with the vacant end of polar conductor cross-arm, and the bottom of polar conductor insulator chain is connected with polar conductor；Metallic return cross-arm is connected with earth wire support, and earth wire support and the tie point of metallic return cross-arm lower end are the second tie point, and metallic return insulator chain is connect with the second tie point, and metallic return is hung on by metallic return insulator chain below the second tie point.The utility model makes full use of line corridor and steel tower, plays the role of Economization on land occupancy and cost saving, with good economic efficiency and social benefit.

Description

Tower without grounding DC transmission line

technical field

The utility model relates to a structure of a pole tower of an electric line, in particular to a pole tower of a DC transmission line without a grounding pole.

Background technique

At present, most bipolar DC transmission systems in my country have supporting grounding electrodes and grounding electrode lines. When necessary, the earth is used as a loop to form a single-pole ground loop operation mode to improve the reliability and flexibility of the DC transmission system. Although the line investment of the single pole return line method is relatively low, it has higher requirements for the site selection of the ground electrode. In addition, when the single pole ground circuit is running, a large DC current is injected into the ground through the ground pole. If there are metal facilities such as transformer substations, underground metal pipes or armored cables near the pole site, the current into the ground may adversely affect these facilities.

With the rapid development of my country's social economy and power grid construction, the land resources available for grounding poles and grounding lines of HVDC transmission systems are becoming increasingly scarce, and the environmental impact and social stability caused by grounding poles and lines are also becoming more and more serious. get more and more attention. Especially in recent years, the UHV DC transmission technology has developed rapidly, and the ground current of the grounding pole has been continuously increased, making the selection of the pole site more difficult. In the design stage of individual UHV DC transmission projects, the location of grounding electrodes and the selection of line paths even become the restrictive factors of the entire DC transmission project.

In view of the above problems, it is a feasible choice to use metal loops instead of grounding electrodes. At present, some DC transmission projects in China have adopted the scheme of erecting the grounding pole line and the pole conductor on the same tower near the converter station, which can be used as a reference for DC transmission lines without grounding poles. However, because the working parameters of the metal return line are quite different from those of the ground electrode line, further research is needed.

Based on the above analysis, it is necessary to study a kind of economical and reasonable tower for direct current transmission lines without grounding poles.

Contents of the invention

The purpose of the utility model is to overcome the disadvantages of the above-mentioned background technology, and provide a pole tower of a direct current transmission line without a grounding pole.

In order to achieve the above purpose, the technical solution of the utility model is: a pole tower of a direct current transmission line without a grounding pole, which is characterized in that it includes a tower body, pole conductor cross-arms arranged horizontally and symmetrically at the left and right ends of the middle and upper part of the tower body, and horizontally arranged with the tower body. The metal return cross arm at the top, the connection point between the pole wire cross arm and the lower end of the tower body is the first connection point, and the pole wire insulator string is arranged at the lower end of the pole wire cross arm; the pole wire insulator string is V-shaped, One end of the wire insulator string is connected to the connection point, and the other end is connected to the spare end of the polar wire cross arm, and the pole wire is connected to the bottom of the polar wire insulator string; the left and right ends of the metal return wire cross arm are connected to the ground wire support, The ground wire support and the metal return wire cross-arm are integrated structures, the connection point between the ground wire support and the metal return wire cross-arm is the second connection point, the metal return wire insulator string is connected to the second connection point, and the metal return wire passes through the metal The return line insulator string is suspended below the second connection point; the metal return line and the pole conductor are arranged on the same tower; the distance L1 from the pole conductor cross arm to the midpoint of the metal return line cross arm is 19.13m, The distance L2 to the midpoint of the metal return cross-arm is 6m, the distance L3 from the ground support to the midpoint of the metal return cross-arm is 11.34m, and the layer spacing H between the metal return cross-arm and the pole conductor cross-arm is 8m .

Compared with the prior art, the beneficial effects of the utility model are as follows:

1) The utility model metal return line and the polar wire are arranged on the same tower, which can make full use of the line corridor and the iron tower, and play the role of saving land occupation and saving engineering investment;

2) The utility model arranges the metal return line above the polar wire, which is convenient for crossing with transmission lines of other voltage levels, and is conducive to the overall planning of transmission line corridors;

3) The utility model arranges the metal return line above the pole conductor, which can effectively reduce the height of the pole conductor crossarm to the ground, which is beneficial to lower the center of gravity of the pole tower, not only increases the reliability of the pole tower, but also improves the lightning resistance level of the pole conductor. It is beneficial to reduce the weight of the tower.

Description of drawings

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

Fig. 2 is a dimension drawing of the utility model.

In the figure, 1-tower body, 1a-first connection point, 2-pole wire cross arm, 3-metal loop cross arm, 3a-second connection point, 4-pole wire insulator string, 5-pole wire, 6 - ground support, 7 - metal return insulator string, 8 - metal return.

Detailed ways

The implementation of the utility model will be described in detail below in conjunction with the accompanying drawings, but they do not constitute a limitation of the utility model, and are only examples. At the same time, the advantages of the present utility model will become clearer and easier to understand through description.

Referring to the accompanying drawings, it can be seen that the pole tower of a direct current transmission line without grounding poles includes a tower body 1, a pole conductor cross arm 2 arranged horizontally and symmetrically at the left and right ends of the middle and upper part of the tower body 1, and a metal loop cross arm 3 horizontally arranged at the top of the tower body 1 , the connection point between the pole conductor cross-arm 2 and the lower end of the tower body 1 is the first connection point 1a, and the pole conductor cross-arm 2 is provided with a pole conductor insulator string 4; the pole conductor insulator string 4 is V-shaped, and the pole conductor One end of the insulator string 4 is connected to the connection point 1a, and the other end is connected to the free end of the pole wire cross arm 2, and the pole wire 5 is connected to the bottom of the pole wire insulator string 4; the left and right ends of the metal loop cross arm 3 are connected to There is a ground wire support 6, the ground wire support 6 and the metal return wire cross arm 3 are of an integrated structure, the connection point between the ground wire support 6 and the metal return wire cross arm 3 is the second connection point 3a, and the metal return wire insulator string 7 Connected with the second connection point 3a, the metal return line 8 is suspended below the second connection point 3a through the metal return line insulator string 7; the metal return line 8 and the pole conductor 5 are arranged on the same tower; the pole conductor crossarm 2 to The distance L1 from the midpoint of the metal loop cross-arm 3 is 19.13m, the distance L2 from the metal loop crossarm 3 to the midpoint of the metal loop crossarm 3 is 6m, and the distance between the ground wire support 6 and the midpoint of the metal loop crossarm 3 The distance L3 is 11.34m, and the layer spacing H between the metal loop crossarm 3 and the pole conductor crossarm 2 is 8m (as shown in Figure 1 and Figure 2).

In actual use, the utility model arranges the metal loop 8 and the pole conductor 5 on the same tower, which can make full use of the line corridor and the iron tower, and play the role of saving land occupation and saving engineering investment; because the metal loop 8 needs to be along the entire DC line For wiring, the erection length of the same tower is significantly longer than that of conventional grounding pole lines; the metal return line 8 is arranged above the pole conductor 5, which is convenient for handling crossover with other voltage level lines; the metal return line 8 is arranged above the pole conductor 5 to effectively Reducing the height of the pole wire crossarm to the ground is beneficial to lower the center of gravity of the tower, which not only increases the reliability of the pole wire 5, improves the lightning resistance level of the pole wire 5, but also helps reduce the weight of the tower; the utility model line spans non-residents and forest areas , the height of the pole conductor cross arm 2 to the ground can be lowered by 3m and 6m respectively compared with the existing pole tower scheme (the metal return line is arranged below the pole conductor).

Other unspecified parts belong to the prior art.

Claims (1)

1. The pole tower of a direct current transmission line without grounding poles is characterized in that it includes a tower body (1), pole conductor cross arms (2) arranged horizontally and symmetrically at the left and right ends of the middle and upper part of the tower body (1), and horizontally arranged with the tower body (1). ) the metal loop cross-arm (3) at the top, the connection point between the polar wire cross-arm (2) and the lower end of the tower body (1) is the first connection point (1a), and the lower end of the pole wire cross-arm (2) is provided with Pole wire insulator string (4); the pole wire insulator string (4) is V-shaped, one end of the pole wire insulator string (4) is connected to the connection point (1a), and the other end is connected to the free space of the pole wire cross arm (2) The pole wire (5) is connected to the bottom of the pole wire insulator string (4); the left and right ends of the metal loop cross arm (3) are connected to a ground wire support (6), and the ground wire support (6) is connected to the The metal loop cross-arm (3) has an integrated structure, the connection point between the ground wire support (6) and the lower end of the metal loop cross-arm (3) is the second connection point (3a), and the metal loop insulator string (7) and the The second connection point (3a) is connected, and the metal return line (8) is suspended below the second connection point (3a) through the metal return line insulator string (7); the metal return line (8) is the same as the polar wire (5) Tower layout; the distance L1 from the polar wire cross arm (2) to the midpoint of the metal return cross arm (3) is 19.13m, and the distance L1 from the metal return cross arm (3) to the midpoint of the metal return cross arm (3) The distance L2 is 6m, the distance L3 from the ground wire support (6) to the midpoint of the metal return cross arm (3) is 11.34m, and the layer spacing between the metal return cross arm (3) and the pole conductor cross arm (2) H is 8m.