CN204089116U - A kind of overhead transmission line double back cable terminal steel pipe pole - Google Patents

Abstract

The utility model discloses a steel pipe rod for a double-circuit cable terminal of an overhead power transmission line, which comprises a steel pipe rod body (1), an upper wire cross arm (2), a middle wire cross arm (3), and a lower wire cross arm (4). , Fully prefabricated dry-type cable terminal head (5), single-core cable (6), line-type zinc oxide arrester (7), post insulator (8), single busbar fixing fixture (9), aluminum row (10), copper and aluminum Transition plate (11), C-type equipment clamp (12), A-type equipment clamp (14), wire jumper expansion joint (15), overhead wire (16), round steel plate bird-proof cover (17), wire resistance Zhang string (18), etc., the utility model is safe and reliable, avoids the damage of the full prefabricated dry cable terminal head due to wind force, can climb a pole for live maintenance, and the overall layout is compact and beautiful.

Description

A double-circuit cable terminal steel pipe pole for overhead transmission lines

Technical field:

The utility model relates to a steel pipe pole for a double-circuit cable terminal of an overhead transmission line, which belongs to the field of design, operation and maintenance of the overhead transmission line of an electric power system.

Background technique:

So far, the standard material of State Grid Corporation's public bidding has been described as a rigid composite casing cable terminal head, although Article 4.1.2 of the "Code for Design of Electric Power Engineering Cables" (GB50217-2007) stipulates that "cable outdoor terminals should be fully dry prefabricated type", but the bids for the fully prefabricated dry-type (or fully-dry prefabricated) cable terminals have not been invited; this is because according to the operation statistics, there are operating defects in individual fully prefabricated dry-type cable terminals installed in the past; the reason is that , the fully prefabricated dry cable terminal head is a flexible material, and the internal stress cone is damaged by the left and right swings under the action of the wind, resulting in uneven internal field strength and further breakdown of the insulation layer; in addition, there has been no mature rigid fixed fully prefabricated dry cable. Terminal header measures. According to the published literature, 9 patented technologies related to cable terminal rods have been searched on the website, none of which involve the relevant technologies of the measures for rigidly fixing the fully prefabricated dry-type cable terminal head. The nine patented technologies are described below:

1. Cable terminal rod (the utility model is Li Yan et al., application number CN200820177282.2): three sets of cross arms are installed on the upper part of the cable terminal rod, and a cable terminal and lightning arrester base are installed at one end of each cross arm; Several groups of fixed leading cable brackets are respectively installed on both sides. There is no mention of how to rigidly fix the fully prefabricated dry cable terminal (flexible), and the shape is not beautiful.

2. Arrangement structure of cable terminal pole tower (utility model person is Zhang Zhijian et al., application number CN201110067309.9): the cable terminal pole tower is provided with a mounting plate, and the mounting plate is fixedly installed with a lightning arrester and a cable terminal connector. The cable terminal The distance between the connector and the arrester is 1-1.5m. This patent is applicable to rigid composite sleeve (or porcelain sheath) cable terminals, and does not mention how to rigidly fix fully prefabricated dry-type cable terminals (flexible), and the shape is not beautiful.

3. Cable terminal rod down-leading device (utility model person is Zhao Shumin et al., application number CN201320671644.4): the cable terminal rod down-leading device includes rod body, cross arm, cable terminal head, lightning arrester and cable terminal cap, cross arm, cable The terminal caps are all fixedly installed on the rod body, the cable terminal head is installed on the cable terminal cap, and the cross arm is provided with a supporting insulator for guiding the cable to the cable terminal head. The lightning arrester cap is installed on the rod body, and the lightning arrester is installed on the lightning arrester cap. This patent is suitable for rigid composite casing (or porcelain sheath) cable terminals. The disadvantage is that several support insulators are located between the overhead line and the cable terminal, and the structure is complex, so it cannot be repaired live on the pole.

4. High-voltage transmission cable terminal rod (utility model is Tang Minyan et al., application number CN201320671723.5): the cable terminal rod includes a rod body, a cross arm and a cable terminal cap, and the cross arm includes a wire cross arm, a wire cross arm and a cable The terminal caps are all fixed on the rod body, and the feature is that the wire cross arm is provided with a lightning arrester hanging ring for installing the lightning arrester. This patent is applicable to rigid composite sleeve (or porcelain sheath) cable terminals, and does not mention how to rigidly fix fully prefabricated dry-type cable terminals (flexible), and the shape is not beautiful.

5. Cable terminal platform and cable terminal tower including it, Li Zhipeng et al., application number CN201220364507.1): The cable terminal platform includes a platform; at least one set of cable terminal installation components is set on the main body of the platform, and each group The cable terminal installation assembly includes three installation parts for installing the cable terminal head, and the three installation parts are arranged so that the distance between each other and the minimum distance between the cable terminal head and the platform are greater than the safety when the wire is charged. distance. This patent is applicable to rigid composite sleeve (or porcelain sheath) cable terminals, and does not mention line-type zinc oxide arresters and how to rigidly fix fully prefabricated dry-type cable terminals (flexible), and the shape is not beautiful.

6. Cable terminal tower (utility model person is Wu Jun et al., application number CN201320278476.2): It is characterized in that it includes a tower rod and an independent bracket arranged on one side of the tower rod, and several wires are arranged on the tower rod. A first support and a second support frame are sequentially arranged below the cross-arm of the wire on the tower pole, and three cross-arm type support insulators are respectively arranged on the second support frame and the first support frame, and A lightning arrester is arranged at the connection between a support frame and the cross-arm type support insulator; a terminal platform is provided on the top of the independent support, and a cable terminal head for fixing cables is arranged on the terminal platform. This technology is similar to patent 3 and is suitable for rigid composite casing (or porcelain sheath) cable terminals. The difference is that the arrester is not set up on the terminal platform. The disadvantage is that several supporting insulators are located between the overhead line and the cable terminal, and the structure is complicated. Unable to carry out live maintenance on the pole.

7. A double-circuit cable terminal tower (utility model owner He Guangyuan et al., application number CN201220150373.3): It includes a tower body and tower legs, and the tower body is fixedly installed from top to bottom with at least 4 layers in the same direction The cross arm is characterized in that: the two ends of the second layer of cross arms are respectively provided with corner frames on the same side, and the position of the tower body below the lowest layer of cross arms is respectively provided with a certain distance from top to bottom. The upper and lower platforms have the same installation direction as the cross arm. This technology describes the cable bracket and cable terminal platform required for the cable to go up the tower, but does not mention the cable terminal and lightning arrester, and does not mention how to rigidly fix the fully prefabricated dry cable terminal (flexible), and the shape is not beautiful.

8. Steel pipe rod for cable terminals (utility model name is Liao Changbi, application number CN201210556488.7): including the main rod with cross arm, lightning arrester and cable terminal head, which is characterized in that it also includes: cable terminal for centralized setting of cable terminal heads support layer, arrester support layer and silicon rod support layer for centralized arrangement of arresters, the cable terminal support layer, lightning arrester support layer, silicon rod support layer and several horizontal bars are sequentially arranged on the main rod from bottom to top, The cable terminal head is arranged on the cable terminal support layer, and the lightning arrester is arranged on the lightning arrester support layer. This technology is similar to patent 3, and is suitable for rigid composite casing (or porcelain sheath) cable terminals. The difference is that the arrester is not on the platform. The disadvantage is that several supporting insulators are located between the overhead line and the cable terminal, and the structure is complex and cannot be mounted on the pole. Live maintenance.

9. Double-circuit overhead line cable terminal station (utility model is Shen Caiyuan et al., application number CN03220371.3): double-circuit overhead line cable terminal station, which is characterized in that two steel pipe poles of different heights are used to form a cable terminal station. The steel pipe rods are connected to each other by connecting rods. The disadvantage of this technology is that it occupies a large area and has a complicated structure, and it is impossible to carry out live maintenance on a pole.

Utility model content:

The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide a safe and reliable double-circuit overhead transmission line that avoids damage to the fully prefabricated dry cable terminal head due to wind force, can be repaired with electricity on the pole, and has a compact and beautiful overall layout. Cable terminal steel pipe pole.

The purpose of this utility model can be achieved through the following measures: a steel pipe pole for the double-circuit cable terminal of an overhead power transmission line, which includes a base plate, a steel pipe pole shaft, and an upper conductor crossarm, a middle conductor crossarm, The lower conductor cross arm is characterized in that between the upper conductor cross arm and the middle conductor cross arm, the vertical distance between the middle conductor cross arm and the lower conductor cross arm is 3.5m to 4m; the upper conductor cross arm, the middle conductor cross arm, The lower ends of the cross-arms of the lower conductors are symmetrically connected with line-type zinc oxide arresters, and the steel pipe poles directly below the upper conductor cross-arms, the middle conductor cross-arms and the lower conductor cross-arms are equipped with post insulators horizontally, and the post insulators are parallel to the upper The conductor cross arm, the middle conductor cross arm, the lower conductor cross arm, and the fully prefabricated dry cable terminal head are connected to the end of the conductor jumper expansion joint through the copper-aluminum transition plate, aluminum row, A-type equipment clamp, and through the post insulator, The single busbar fixing fixture rigidly fixes the fully prefabricated dry-type cable terminal head, and the line type zinc oxide arrester is connected to the end of the wire jumper expansion joint through the aluminum row and the equipment clamp; the upper conductor cross arm, the middle conductor cross arm, and the lower conductor cross arm The two ends of the wire are connected to the overhead wire through the wire tension string, and the overhead wire is connected to the wire jumper expansion joint. The prefabricated dry-type cable terminals are connected with a single-core cable, and the single-core cable is fixed on the cable bracket on the steel pipe pole, and the three single-core cables below the cross arm of the lower conductor are arranged in the shape of a square.

In order to further realize the purpose of the utility model, the arc length of the wire jumper expansion joint is 3.5-4 meters.

In order to further realize the purpose of the utility model, the length of the upper conductor cross-arm is 2.0m, the length of the middle conductor cross-arm is 2.5m, and the length of the lower conductor cross-arm is 2.0m. the

In order to further realize the purpose of the utility model, the distance between the line-type zinc oxide arrester and the shaft of the steel pipe rod is 1.5m. the

In order to further realize the purpose of the utility model, the distance between the above-mentioned post insulator and the cross-arm of the upper conductor, the cross-arm of the middle conductor and the cross-arm of the lower conductor is 1.7m. the

In order to further realize the purpose of the utility model, the single-core cable is provided with a cable protection tube.

In order to further realize the purpose of the utility model, the radius of the bending part of the single-core cable entering the ground is 20D, and D is the outer diameter of the cable.

Compared with the prior art, the utility model can produce the following positive effects: First, on the basis of the conventional rod head design, the vertical distance between the three-layer wire cross-arms is increased from 3.5m to 4m, which is convenient for all prefabricated dry-type cable terminals Head 5, line-type zinc oxide arrester 7, and post insulator 8 are organically connected to make the cable bending radius meet the technical requirements; the second is through post insulator 8, aluminum row 10 copper-aluminum transition plate 11, A-type equipment clamp 14. Rigidly fix the fully prefabricated dry-type cable terminal head 5 to avoid its internal stress cone damage; the third is to install the fully prefabricated dry-type cable terminal head 5, line-type zinc oxide arrester 7, post insulator 8, and electrical design in a decentralized manner at the rod head position Compact, symmetrical, and beautiful; the fourth is the sag and length of the jumper expansion joint set up between the overhead conductor 16 and the post insulator 8, which meets the requirements for the wire tension string to swing up and down and left and right during line dancing or strong winds; fifth is the rod Three single-core cables on one side of the body and lower conductor crossarms below 4 are arranged in the shape of a square, so as to achieve the purpose of compact and beautiful appearance design. The cables are arranged compactly in a square shape on the side of the pole body 1, which is convenient for live maintenance on the pole; the whole is compact and beautiful.

Description of drawings:

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

Fig. 2 is a structural schematic diagram of the club head part in Fig. 1;

Fig. 3 is a side view of Fig. 1;

Fig. 4 is an enlarged view of part A of Fig. 2;

Fig. 5 is an enlarged view of part B of Fig. 3;

Fig. 6 is the 6-6 sectional view of Fig. 1;

Fig. 7 is the 5-5 sectional view of Fig. 1;

Fig. 8 is a sectional view of 4-4 of Fig. 1;

Fig. 9 is a 3-3 sectional view of Fig. 1;

Fig. 10 is a 2-2 sectional view of Fig. 1;

Fig. 11 is a sectional view of line 1-1 in Fig. 1 .

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

Embodiment: A steel pipe pole for double-circuit cable terminals of overhead power transmission lines (see Fig. 1-Fig. 5), which includes a base plate 30, the base plate 30 is connected to the steel pipe pole shaft 1, and the steel pipe pole shaft 1 is provided with an upper wire horizontal Bearer 2, middle conductor cross arm 3, lower conductor cross arm 4; upper conductor cross arm 2 length 2.0m, middle conductor cross arm 3 length 2.5m, lower conductor cross arm 4 length 2.0m, upper conductor cross arm 2 and middle conductor Between the cross arms 3, the vertical distance between the middle conductor cross arm 3 and the lower conductor cross arm 4 is 3.5m to 4m; the lower ends of the upper conductor cross arm 2, the middle conductor cross arm 3 and the lower conductor cross arm 4 are connected symmetrically There is a line-type zinc oxide arrester 7, the distance between the arrester 7 and the steel pipe rod shaft 1 is 1.5m, and the steel pipe rod shaft 1 directly below the upper wire cross arm 2, the middle wire cross arm 3, and the lower wire cross arm 4 A post insulator 8 is installed horizontally on the top, and the post insulator 8 is parallel to the upper conductor cross arm 2, the middle conductor cross arm 3, and the lower conductor cross arm 4, and is connected to the upper conductor cross arm 2, the middle conductor cross arm 3, and the lower conductor cross arm respectively. Bearing 4 is 1.7m apart; fully prefabricated dry-type cable terminal head 5 successively passes through the MG-100×10 copper-aluminum transition plate 11 of the outer sealing heat shrinkable tube, the -80×12 type aluminum bar 10, the A-type equipment clamp 14 and the wire The ends of the jumper telescopic section 15 are connected, and the fully prefabricated dry-type cable terminal 5 is rigidly fixed by the post insulator 8 and the single busbar fixing fixture 9, so as to avoid the internal structure of the fully prefabricated dry-type cable terminal 5 from being damaged due to wind speed swing; The jumper telescopic joint 15 is wound with an aluminum tape 13 for protection. The line type zinc oxide arrester 7 is connected to the end of the wire jumper expansion joint 15 through the aluminum row 10 and the SY-300/40C type equipment clamp 12; Both ends are connected to the overhead wire 16 through the wire tension string 18, and the overhead wire 16 is connected to the wire jumper expansion joint 15. Type cable terminal head 5, line type zinc oxide arrester 7 are electrically connected reliably. The arc length of wire jumper telescopic joint 15 is 3.5-4 meters, so as to meet the requirements of wire tension string 18 and reduce generation of tensile force to post insulator 8 in the process of swinging up and down and left and right. The upper end of upper conductor cross-arm 2, middle conductor cross-arm 3, and lower conductor cross-arm 4 is all provided with round steel plate anti-bird cover 17, and it is located at the directly above post insulator 8, in order to prevent bird damage. Each fully prefabricated dry cable terminal head 5 is connected to a single-core cable 6, and the single-core cable 6 is fixed on the cable support 25, the cable support 24, the cable support 23, and the cable support 22 on the steel pipe rod shaft 1. The double-circuit cables on the steel pipe pole shaft 1 are arranged horizontally (see Figure 6 and Figure 7), and the three single-core cables below the cross arm 4 of the lower conductor are arranged in a zigzag shape (see Figure 8-11), fixed on On the cable support of the steel pipe rod shaft 1, the purpose of reducing the induced voltage of the metal sheath, increasing the cable carrying capacity and the appearance of the double-circuit cable terminal steel pipe rod is beautiful; the single-core cable 6 is provided with a cable protection tube 19 to avoid being damaged trauma. The radius of the bending part between the fully prefabricated dry-type cable terminal head 5 and the single-core cable 6, and the bending part of the single-core cable 6 entering the ground should meet the minimum installation bending radius of the cable (20D, D is the outer diameter of the cable).

Claims (7)

1. A steel pipe pole for double-circuit cable terminals of overhead transmission lines, which includes a base plate (30), a steel pipe pole shaft (1), and a steel pipe pole shaft (1) is provided with an upper conductor cross arm (2), a middle conductor The cross arm (3) and the lower conductor cross arm (4) are characterized in that between the upper conductor cross arm (2) and the middle conductor cross arm (3), the middle conductor cross arm (3) and the lower conductor cross arm (4) The vertical distance between them is 3.5m to 4m; the lower ends of the upper conductor crossarm (2), the middle conductor crossarm (3) and the lower conductor crossarm (4) are symmetrically connected with a line-type zinc oxide arrester (7). The pole insulators (8) are horizontally installed on the steel pipe rod shaft (1) directly below the conductor cross arm (2), the middle conductor cross arm (3), and the lower conductor cross arm (4), and the support insulators (8) are parallel to each other. The upper conductor cross arm (2), the middle conductor cross arm (3), the lower conductor cross arm (4), and the fully prefabricated dry-type cable terminal head (5) successively pass through the copper-aluminum transition plate (11) and the aluminum row (10) , A-type equipment clamp (14) is connected to the end of the wire jumper telescopic joint (15), and the fully prefabricated dry-type cable terminal (5) is rigidly fixed by the post insulator (8) and the single busbar fixing fixture (9). The type zinc oxide arrester (7) is connected to the end of the wire jumper expansion joint (15) through the aluminum row (10) and the equipment clamp (12); the upper wire cross arm (2), the middle wire cross arm (3), the lower wire Both ends of the wire cross arm (4) are connected to the overhead wire (16) through the wire tension string (18), the overhead wire (16) is connected to the wire jumper expansion joint (15), the upper wire cross arm (2), the middle wire The upper ends of the cross arm (3) and the lower conductor cross arm (4) are provided with round steel plate bird-proof covers (17), and each fully prefabricated dry-type cable terminal (5) is connected with a single-core cable (6). The core cable (6) is fixed on the cable bracket on the steel pipe rod shaft (1), and every time 3 single-core cables below the lower conductor cross arm (4) are arranged in the shape of a character. 2. A steel pipe pole for double-circuit cable terminals of overhead transmission lines according to claim 1, characterized in that the arc length of the wire jumper expansion joint (15) is 3.5-4 meters. 3. A steel pipe pole for double-circuit cable terminals of overhead transmission lines according to claim 1, characterized in that the length of the upper conductor cross arm (2) is 2.0 m, the length of the middle conductor cross arm (3) is 2.5 m, and the lower conductor cross arm (3) is 2.5 m long. The length of the wire cross arm (4) is 2.0m. 4. A steel pipe pole for double-circuit cable terminals of overhead transmission lines according to claim 1, characterized in that the distance between the line-type zinc oxide arrester (7) and the steel pipe pole shaft (1) is 1.5 m. 5. A steel pipe pole for double-circuit cable terminals of overhead transmission lines according to claim 1, characterized in that said post insulators (8) are respectively connected to the upper conductor cross arm (2), the middle conductor cross arm (3), The lower conductor cross-arm (4) is 1.7m apart. 6. A steel pipe pole for double-circuit cable terminals of overhead transmission lines according to claim 1, characterized in that the single-core cable (6) is provided with a cable protection tube (19). 7. A steel pipe pole for double-circuit cable terminals of overhead transmission lines according to claim 1, characterized in that the radius of the bending part of the single-core cable (6) entering the ground is 20D, and D is the outer diameter of the cable.