Same-tower four-loop cable terminal tower

Abstract

The utility model provides a same-tower four-loop cable terminal tower, the upper part of the tower is provided with two loops which are respectively arranged at the left side and the right side of a wire cross arm at the upper part of the tower, and the middle part of the tower is provided with two loops which are respectively arranged at the left side and the right side of a middle wire upper-layer cross arm and a middle wire lower-layer cross arm of the tower. Different from the mode that three-phase wires of each circuit of the upper part are vertically arranged on three layers of cross arms, three-phase wires of each circuit of the middle part are arranged on middle wire upper-layer cross arms and middle wire lower-layer cross arms, two-phase wires are arranged on the middle wire upper-layer cross arms which are relatively close to the upper part, and one-phase wire is arranged on the middle wire lower-layer cross arms which are relatively close to the lower part; according to the utility model, the positions of four circuits are reasonably arranged, a leading-down scheme of an overhead line is safely selected, and meanwhile, load combination conditions and three-dimensional verification of electrical gaps are optimized, so that the tower realizes coordination and unification of reliability, economical efficiency, advancement and flexibility.

Description

Technical Field

[0001] The utility model relates to the technical field of ultra-high voltage overhead transmission lines, in particular to an AC 220kV four-circuit cable terminal tower on the same tower. Background Art

[0002] In the design of conventional AC 220kV overhead transmission lines, cable terminal towers are generally designed as single-circuit or double-circuit towers. That is, the single-circuit or double-circuit overhead transmission line is connected to the tower, then led down from the tower, and finally laid into the underground pipeline network by cable.

[0003] However, with the development of urban construction, in order to save space in corridors, transmission lines in urban areas are either newly built or renovated, resulting in a large number of four-circuit overhead transmission lines on the same tower. When four-circuit overhead transmission lines on the same tower need to be buried underground, ordinary cable terminal towers are obviously unable to meet the needs of the project. Utility Model Content

[0004] The purpose of this utility model is to provide a four-circuit cable terminal tower on the same tower, which rationally arranges the positions of the four circuits, safely selects the down-leading scheme of the overhead lines, optimizes the load combination conditions, and verifies the electrical clearance in three dimensions. This makes the tower achieve a harmonious unity of reliability, economy, advancement, and flexibility.

[0005] To achieve the above-mentioned object, the utility model provides a four-circuit cable terminal tower on the same tower. Two circuits are arranged on the upper part of the tower, which are separated on the left and right sides of the conductor cross arm on the upper part of the tower. After the three-phase conductors of the right circuit are connected to the tower, they are respectively connected from the tension string of the overhead line through the single jumper string of the conductor cross arm and the jumper strings of two jumper brackets on the rear side of the conductor cross arm to the support insulator on the rear side of the tower body; after the three-phase conductors of the left circuit are connected to the tower, they are respectively connected from the tension string of the overhead line through the jumper strings of the jumper bracket on the front side of the conductor cross arm to the support insulator on the front side of the tower body. In this way, the two circuits on the upper part are respectively led down from the front and rear sides of the tower to the cable terminal platform.

[0006] Two circuits are arranged in the middle of the tower, on the left and right sides of the upper crossarm of the middle conductor and the lower crossarm of the middle conductor. Different from the three-phase conductors of each circuit in the upper part being arranged vertically on the three-layer crossarm, the three-phase conductors of each circuit in the middle are arranged on the upper crossarm of the middle conductor and the lower crossarm of the middle conductor. The upper crossarm of the middle conductor closer to the top is arranged with two-phase conductors, and the lower crossarm of the middle conductor closer to the bottom is arranged with one-phase conductor. After the upper left-phase conductor of the right circuit is connected to the tower, it passes from the tension string of the overhead line through the single jump string of the conductor crossarm, the jump string of the jumper bracket on the rear side of the conductor crossarm, and the support insulator on the rear side of the lower crossarm of the middle conductor, and is connected to the support insulator. On the support insulator on the rear side of the insulation crossarm; after the upper right phase conductor is connected to the iron tower, it is connected from the tension string of the overhead line through the single jump string of the conductor crossarm and the support insulator on the right side of the lower crossarm to the support insulator on the right side of the support insulator crossarm; after the lower conductor is connected to the iron tower, it is directly connected from the tension string of the overhead line to the support insulator on the front side of the support insulator crossarm. The wiring method of the right circuit is the same as that of the left circuit, so that the two middle circuits are respectively led down from the left and right sides of the upper crossarm of the middle conductor and the lower crossarm of the middle conductor of the iron tower to the cable terminal platform; the support insulator crossarm and cable terminal platform are arranged at the bottom of the tower.

[0007] Furthermore, the length of the conductor cross-arm support is controlled at 3.6m, the length of the support insulators on the front and rear sides of the tower body is controlled at 2.5m, and the spacing between the support insulators is controlled at 3m to 5m.

[0008] The utility model reasonably arranges the positions of the four-circuit lines, safely selects the overhead line lead-down scheme, optimizes the load combination conditions, and three-dimensionally verifies the electrical clearance, so that the tower achieves the coordinated unity of reliability, economy, advancement and flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The schematic examples and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. The accompanying drawings show a schematic diagram of the structural layout of the cable terminal tower.

[0010] Figure 1 : Three-dimensional general view of the tower;

[0011] Figure 2 : Top view of the upper right circuit conductor crossarm;

[0012] Figure 3 : Top view of the upper left circuit conductor crossarm;

[0013] Figure 4 : Top view of the upper cross arm of the middle right circuit conductor;

[0014] Figure 5: Top view of the lower cross arm of the middle right circuit conductor.

[0015] Among them, 1. Upper conductor crossarm; 2. Tower body; 3. Middle conductor upper crossarm; 4. Middle conductor lower crossarm; 5. Pillar insulator crossarm; 6. Cable terminal platform; 7. Overhead conductor tension string hanging point; 8. Overhead conductor jumper hardware string hanging point; 9. Jumper bracket; 10. Pillar insulator hanging point. DETAILED DESCRIPTION

[0016] Reference Figures 1 to 5 The utility model provides a four-circuit cable terminal tower on the same tower. Two circuits are arranged on the upper part of the tower, which are separated on the left and right sides of the upper conductor cross arm 1 of the iron tower. After the three-phase conductors of the right circuit are connected to the iron tower, they are respectively connected from the tension string of the overhead line through the single jumper string of the upper conductor cross arm 1 and the jumper strings of the two jumper brackets 9 on the rear side of the upper conductor cross arm 1 to the support insulator on the rear side of the tower body 2; after the three-phase conductors of the left circuit are connected to the iron tower, they are respectively connected from the tension string of the overhead line through the jumper strings of the jumper bracket 9 on the front side of the upper conductor cross arm 1 to the support insulator on the front side of the tower body 2. In this way, the two circuits on the upper part are respectively led down from the front and rear sides of the iron tower to the cable terminal platform 6.

[0017] Two circuits are arranged in the middle of the tower, which are located on the left and right sides of the upper crossarm 3 and the lower crossarm 4 of the middle conductor of the iron tower. Different from the three-phase conductors of each circuit in the upper part which are arranged vertically on the three-layer crossarm, the three-phase conductors of each circuit in the middle part are arranged on the upper crossarm 3 and the lower crossarm 4 of the middle conductor. The upper crossarm 3 of the middle conductor which is relatively upper is arranged with two-phase conductors, and the lower crossarm 4 of the middle conductor which is relatively lower is arranged with one-phase conductor. After the upper left-phase conductor of the right circuit is connected to the iron tower, it passes from the tension string of the overhead line through the single jump string of the upper crossarm 3 of the middle conductor, the jump string of the jumper bracket 9 on the rear side of the upper crossarm 3 of the middle conductor, and the support insulator on the rear side of the lower crossarm 4 of the middle conductor, and is connected to the support insulator. On the support insulator on the rear side of the insulation crossarm 5; after the upper right phase conductor is connected to the iron tower, it is connected from the tension string of the overhead line through the single jump string of the upper crossarm 3 of the middle conductor and the support insulator on the right side of the lower crossarm 4 of the middle conductor to the support insulator on the right side of the support insulator crossarm 5; after the lower conductor is connected to the iron tower, it is directly connected from the tension string of the overhead line to the support insulator on the front side of the support insulator crossarm 5. The wiring method of the right circuit is consistent with that of the left circuit, so that the two middle circuit lines are respectively led down from the left and right sides of the middle conductor upper crossarm 3 and the middle conductor lower crossarm 4 of the iron tower to the cable terminal platform 6; the support insulator crossarm 5 and the cable terminal platform 6 are arranged at the lower part of the tower.

[0018] Figures 2 to 3Note: The top is the front and the bottom is the back, so the upper conductor crossarm 1 is divided into left and right. The right loop is connected from the front of the upper conductor crossarm 1 to the right crossarm of the upper conductor, and then goes through a single jump string and goes around to the two jumper brackets 9 at the back; the left loop is connected from the front of the upper conductor crossarm 1 to the left crossarm of the upper conductor, and directly connected to a jumper bracket 9 at the front.

[0019] Figure 4 Note: The top is the front and the bottom is the back.

[0020] The length of the conductor cross-arm support is controlled at 3.6m, the length of the support insulators on the front and rear sides of the tower body is controlled at 2.5m, and the spacing between the support insulators is controlled at 3m to 5m.

Claims

1. A four-circuit cable terminal tower on the same tower, characterized in that: Two circuits are arranged on the upper part of the tower, on the left and right sides of the conductor crossarm on the upper part of the tower. After the three-phase conductors of the right circuit are connected to the tower, they are respectively connected from the tension string of the overhead line through the single jumper string of the conductor crossarm and the jumper strings of the two jumper brackets on the rear side of the conductor crossarm to the support insulator on the rear side of the tower body; after the three-phase conductors of the left circuit are connected to the tower, they are respectively connected from the tension string of the overhead line through the jumper strings of the jumper bracket on the front side of the conductor crossarm to the support insulator on the front side of the tower body. In this way, the two circuits on the upper part are respectively led down from the front and rear sides of the tower to the cable terminal platform. Two circuits are arranged in the middle of the tower, on the left and right sides of the upper crossarm of the middle conductor and the lower crossarm of the middle conductor. Different from the three-phase conductors of each circuit in the upper part being arranged vertically on the three-layer crossarm, the three-phase conductors of each circuit in the middle are arranged on the upper crossarm of the middle conductor and the lower crossarm of the middle conductor. The upper crossarm of the middle conductor closer to the top is arranged with two-phase conductors, and the lower crossarm of the middle conductor closer to the bottom is arranged with one-phase conductor. After the upper left-phase conductor of the right circuit is connected to the tower, it passes from the tension string of the overhead line through the single jump string of the conductor crossarm, the jump string of the jumper bracket on the rear side of the conductor crossarm, and the support insulator on the rear side of the lower crossarm of the middle conductor, and is connected to the support insulator. On the support insulator on the rear side of the insulation crossarm; after the upper right phase conductor is connected to the iron tower, it is connected from the tension string of the overhead line through the single jump string of the conductor crossarm and the support insulator on the right side of the lower crossarm to the support insulator on the right side of the support insulator crossarm; after the lower conductor is connected to the iron tower, it is directly connected from the tension string of the overhead line to the support insulator on the front side of the support insulator crossarm. The wiring method of the right circuit is the same as that of the left circuit, so that the two middle circuits are respectively led down from the left and right sides of the upper crossarm of the middle conductor and the lower crossarm of the middle conductor of the iron tower to the cable terminal platform; the support insulator crossarm and cable terminal platform are arranged at the bottom of the tower.

2. A four-circuit cable terminal tower on the same tower according to claim 1, characterized in that: The length of the conductor cross-arm support is controlled at 3.6m, the length of the support insulators on the front and rear sides of the tower body is controlled at 2.5m, and the spacing between the support insulators is controlled at 3m to 5m.

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