Direct current line suspension tower ground wire hanging point structure suitable for tension hanging point and design method

Abstract

The application discloses a DC line suspension tower ground wire hanging point structure suitable for tension hanging points and a design method, realizes the problem of conveniently replacing the suspension ground wire hanging point on a suspension tower with a tension ground wire hanging point, and is characterized in that: an overhanging rectangular frame (5) is arranged outside a ground wire cross arm (4); a suspension hanging plate connecting seat (7) is arranged on an outer side horizontal longitudinal beam (6) of the overhanging rectangular frame (5), a suspension hanging plate (8) is connected to the suspension hanging plate connecting seat (7), and a suspension hanging plate ground wire fitting hanging point (9) is arranged on the suspension hanging plate (8); a tension hanging point front side hanging plate connecting seat (11) is arranged on a front side horizontal beam (10) of the overhanging rectangular frame (5), a tension hanging point front side hanging plate (14) is connected to the tension hanging point front side hanging plate connecting seat (11), and a tension hanging plate front side ground wire fitting hanging point (15) is arranged on the tension hanging point front side hanging plate (14); and the application has the advantages of simple structure and convenient operation.

Description

TECHNICAL FIELD

[0001] The present application relates to a DC line suspension tower, in particular to a ground wire hanging point structure and design method of a DC line suspension tower applicable to both strain suspension points. BACKGROUND

[0002] The ground wire of an extra-high voltage DC line suspension tower is connected to the ground wire hanging point of the tower through fittings. The ground wire of the suspension tower is usually suspended from the hanging point, that is, the fittings are suspended from the ground wire support hanging point at the top of the tower. When the tower is manufactured and processed, the designer determines the type of the suspension tower according to the electrical professional calculation results. After the tower is assembled, the ground wire can only be suspended from the hanging point. The existing suspension tower has two types of hanging points: the first type is a single suspension point, and the second type is a double suspension point. The single suspension point is connected to the tower through an EB hanging plate, and the plate width of the EB hanging plate is e and the diameter of the tower connecting bolt is M. The double suspension point is connected to the tower through two EB hanging plates, and the distance between the double suspension points is L, the plate width of the EB hanging plate is e, and the diameter of the tower connecting bolt is M. In the prior art, the single suspension point and the double suspension point can be interchanged.

[0003] The ground wire structure of the DC line suspension tower is a relatively weak link on the transmission tower. In recent years, extreme weather has had a great impact on the safe operation of the extra-high voltage DC line, especially the icing of the line, which easily causes the breaking of the ground wire, the deformation of the fittings, and the breaking of the ground wire support, and other accidents. In the treatment of such accidents, it is sometimes necessary to adjust the type of the ground wire hanging point, that is, to change the suspension type of the ground wire of the DC line suspension tower to the strain type. Before the change, the electrical parameters of the tower need to be recalculated, and then the main angle steel and the components connected thereto, and the replacement of the rod and other components are processed according to the calculation results. This process has the defects of time-consuming and laborious. If a suspension tower ground wire structure applicable to the strain hanging point is designed, it can be used with both the suspension ground wire hanging point and the strain ground wire hanging point, which is a problem to be solved in the design of the tower ground wire hanging point. SUMMARY

[0004] The present application provides a DC line suspension tower ground wire hanging point structure applicable to the strain hanging point, which realizes the technical problem of conveniently changing the suspension ground wire hanging point of the suspension tower to the strain ground wire hanging point.

[0005] The general idea of the present application is to design the ground wire hanging point of the suspension tower to be applicable to both the suspension ground wire hanging point and the strain ground wire hanging point. When the tower is put into operation, the suspension ground wire hanging point is used first. When the suspension hanging point needs to be changed to the strain ground wire hanging point, the change can be conveniently made.

[0006] The application discloses a DC line suspension tower ground wire hanging point structure suitable for a strain hanging point, which comprises a DC suspension tower body, a cross arm arranged at the top end of the DC suspension tower body, a ground wire support arranged on the cross arm, a ground wire cross arm arranged at the top end of the ground wire support, and an outward extending rectangular frame arranged outside the ground wire cross arm.

[0007] The suspension hanging plate connecting seat arranged on the outer side horizontal longitudinal beam of the outward extending rectangular frame is a single hanging point suspension hanging plate connecting seat or a double hanging point suspension hanging plate connecting seat.

[0008] The application has the advantages of simple structure, convenient operation, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 Fig. 1 is a structural schematic diagram of an outward extending rectangular frame 5 of the application;

[0010] Figure 2 Fig. 2 is a structural schematic diagram of a suspension double hanging point and strain hanging point of an outer side horizontal longitudinal beam 6 of the application;

[0011] Figure 3 Fig. 3 is a structural schematic diagram of a suspension single hanging point and strain hanging point of the outer side horizontal longitudinal beam 6 of the application;

[0012] Figure 4 Fig. 4 is a structural schematic diagram of a structure for an iron tower of the application;

[0013] Figure 5 Fig. 5 is a structural schematic diagram of a ground wire support 3 of the application;

[0014] Figure 6 Fig. 6 is a structural schematic diagram of a suspension hanging plate of the application;

[0015] Figure 7 Fig. 7 is a structural schematic diagram of a strain hanging plate of the application;

[0016] Figure 8 is a structural schematic diagram of the existing DC line suspension tower ground wire hanging point support;

[0017] Figure 9 is a structural schematic diagram of the span structure at the connection between the existing DC line suspension tower ground wire hanging bracket and the cross arm;

[0018] Figure 10 is a structural schematic diagram of the tower body and the cross arm of the existing DC line suspension tower. DETAILED DESCRIPTION

[0019] The application will be described in detail below with reference to the accompanying drawings:

[0020] A DC line suspension tower ground wire hanging point structure suitable for strain hanging points, comprising a DC suspension tower body 1, a cross arm 2 is arranged at the top end of the DC suspension tower body 1, a ground wire support 3 is arranged on the cross arm 2, a ground wire cross arm 4 is arranged at the top end of the ground wire support 3, and an outward extending rectangular frame 5 is arranged outside the ground wire cross arm 4; a suspension hanging plate connecting seat 7 is arranged on the outer side horizontal longitudinal beam 6 of the outward extending rectangular frame 5, a suspension hanging plate 8 is connected to the suspension hanging plate connecting seat 7, and a suspension hanging plate ground wire fitting hanging point 9 is arranged on the suspension hanging plate 8; a strain hanging point front side hanging plate connecting seat 11 is arranged on the front side horizontal beam 10 of the outward extending rectangular frame 5, a strain hanging point front side hanging plate 14 is connected to the strain hanging point front side hanging plate connecting seat 11, and a strain hanging plate front side ground wire fitting hanging point 15 is arranged on the strain hanging point front side hanging plate 14; a strain hanging point rear side hanging plate connecting seat 13 is arranged on the rear side horizontal beam 12 of the outward extending rectangular frame 5, a strain hanging point rear side hanging plate is connected to the strain hanging point rear side hanging plate connecting seat 13, and a strain hanging plate rear side ground wire fitting hanging point is arranged on the strain hanging point rear side hanging plate; and a connecting jumper is arranged between the strain hanging plate front side ground wire fitting hanging point 15 and the strain hanging plate rear side ground wire fitting hanging point.

[0021] The suspension hanging plate connecting seat 7 arranged on the outer side horizontal longitudinal beam 6 of the outward extending rectangular frame 5 is a single hanging point suspension hanging plate connecting seat or a double hanging point suspension hanging plate connecting seat; the suspension double hanging points can be converted into suspension single hanging points by rotating the wire hanging angle steel by 180 degrees, so that the limbs of the two wire hanging angle steels are opposite to each other, and the limb distance satisfies a certain quantitative relationship.

[0022] The setting method of the existing suspension ground wire hanging point is as follows (see Figures 8-10): set the overhead ground wire hanging point, electrical professional selected overhead ground wire hanging point fittings type EB-XX, once the type of fittings is determined, the corresponding size parameters are determined, the center distance of the overhead fittings EB-XX is L when double hanging points, according to the above size to determine the minimum length L1 of the outer side horizontal longitudinal beam 6; the tower body 1 is a square steel frame, the longitudinal width of the tower body 1 connected with the cross arm 2 is L2, the end of the cross arm 2 is the wire hanging bracket 16, the longitudinal width is L3, in order to ensure the smooth transmission of the ground wire load, and facilitate the processing of the tower, according to L2 and L3 to determine the slope P of the front and back of the cross arm 2, according to the requirement of the ground wire protection angle, and according to the slope P of the cross arm 2, the longitudinal width L4 of the connection between the ground wire support 3 and the cross arm 2 can be determined, and then the length L1 of the outer side horizontal longitudinal beam 6 and L4 are used to determine the longitudinal front and back slope P1 of the ground wire support 3, since L1 is less than L4, the ground wire cross arm 4 and the outer extension frame constructed by this method are trapezoidal, then the outer side horizontal longitudinal beam 6 is connected with the front and back side horizontal beams 10 and 12, and it can be ensured that the outer side horizontal longitudinal beam 6 is consistent with the direction of the line, then according to the size of the EB fittings and the requirement of double hanging points, the overhead hanging plate connecting seat 7 is set on the outer side horizontal longitudinal beam 6, there are four overhead hanging plate connecting seats 7, each two overhead hanging plate connecting seats 7 form a single hanging point, and two single hanging points are formed, the distance L6 between the overhead hanging plate connecting seats 7 in each single hanging point, the distance between the two single hanging points is L, when the inner two overhead hanging plate connecting seats 7 are rotated by 180 degrees, the limbs are opposite, a certain quantity relationship is satisfied, that is, the overhead double hanging point is converted into an overhead single hanging point.

[0023] In the above-mentioned existing overhead hanging point setting method, the front side horizontal beam 17 of the ground wire cross arm 4 and the front side horizontal beam 10 of the outer extension trapezoidal frame are a rod piece, which is not perpendicular to the line direction, and the front side hanging plate connecting seat 11 of the strain hanging point is connected on the front side horizontal beam 10 of the outer extension trapezoidal frame, and the ground wire connected thereon is not in the line direction, so that the connection does not meet the electrical clearance requirement, and is extremely unfavorable for the stress of the ground wire support 3; in order to solve the above-mentioned strain hanging point problem, the horizontal beam 17 and the horizontal beam 10 are disconnected at the connection between the ground wire cross arm 4 and the outer extension trapezoidal frame, the horizontal beam 10 is arranged perpendicular to the line direction, and the horizontal beam 17 and the horizontal beam 12 are disconnected, the horizontal beam 12 is arranged perpendicular to the line direction, the outer extension trapezoidal frame becomes a rectangular frame, at this time the length of the outer side horizontal longitudinal beam 6 is L5, L5 is greater than L1, and the outer extension rectangular frame 5 constructed by this method meets the electrical clearance requirement, and is most favorable for the stress of the ground wire support 3.

Claims

1. A DC line suspension tower ground wire hanging point structure suitable for a tension hanging point, comprising a DC suspension tower body (1), a cross arm (2) is arranged at the top end of the DC suspension tower body (1), a ground wire support (3) is arranged on the cross arm (2), and a ground wire cross arm (4) is arranged at the top end of the ground wire support (3), characterized in that, The outer extension rectangular frame (5) is arranged outside the ground wire cross arm (4); the overhanging hanging plate connecting seat (7) is arranged on the outer side horizontal longitudinal beam (6) of the outer extension rectangular frame (5), the overhanging hanging plate (8) is connected on the overhanging hanging plate connecting seat (7), the overhanging hanging plate ground wire fitting hanging point (9) is arranged on the overhanging hanging plate (8); the strain point front side hanging plate connecting seat (11) is arranged on the front side horizontal cross beam (10) of the outer extension rectangular frame (5), the strain point front side hanging plate (14) is connected on the strain point front side hanging plate connecting seat (11), the strain plate front side ground wire fitting hanging point (15) is arranged on the strain point front side hanging plate (14), the strain point rear side hanging plate connecting seat (13) is arranged on the rear side horizontal cross beam (12) of the outer extension rectangular frame (5), the strain point rear side hanging plate is connected on the strain point rear side hanging plate connecting seat (13), the strain plate rear side ground wire fitting hanging point is arranged on the strain point rear side hanging plate, the connecting jumper is arranged between the strain plate front side ground wire fitting hanging point (15) and the strain plate rear side ground wire fitting hanging point; the overhanging hanging plate connecting seat (7) arranged on the outer side horizontal longitudinal beam (6) of the outer extension rectangular frame (5) is a single hanging point overhanging hanging plate connecting seat or a double hanging point overhanging hanging plate connecting seat.

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