CN213175047U - 220kV double-loop tangent tower based on 500kV long-range single loop - Google Patents

Abstract

The utility model relates to a transmission line tangent tower, especially a 220kV double-circuit tangent tower based on 500kV single circuit of long shot, its structural feature lies in, the tower head includes the entablature, the vertical arched girder that is located the entablature both sides and supports the V type corbel of two arched girders, and enclose into the tower window by the above-mentioned component, set up two sets of V type insulator chains of unequal length in the tower window, wherein the long cluster is the same with 500kV single circuit I type cluster length, two long clusters one end is articulated at tower window entablature central point jointly, short cluster one end is articulated respectively at the intermediate point of the arched girder on both sides; the cross arm includes limit cross arm and lower cross arm, and the limit cross arm is connected in V type strutbeam upper end outside portion, and lower cross arm is to dismantle with the body of a tower and is connected, and two kinds of cross arms all set up I type insulator chain. Has the advantages that: the original line corridor is fully utilized, a new line path is not required to be opened up, the land resource is saved, the construction is simple and convenient, the construction period is short, the engineering quantity is small, and the engineering investment is greatly reduced.

Description

220kV double-loop tangent tower based on 500kV long-range single loop

Technical Field

The utility model relates to a transmission line tangent tower, especially a 220kV double-circuit tangent tower based on long-range view 500kV single loop.

Background

According to power system power grid planning, combined with regional power grids and power load development, situations often occur in which a power grid is planned and a power transmission line is built according to a 220kV voltage class in the current period, and the voltage is required to be boosted to a 500kV voltage class in a long-range view. Taking the fact that a power grid in a certain area is built in good fortune as an example, in order to meet the requirement of sending electric energy out of a certain power plant, two 220kV power transmission channels are newly built in the current period, with the construction of a 500kV transformer substation in a distant view near the channels and the continuous development of a grid frame, the trend of normal operation of the original two 220kV power transmission channels is gradually reduced, the functions and the exerted benefits of the related channels in the power grid are gradually reduced, and a corresponding 500kV line corridor is opened up to be connected into the 500kV transformer substation in combination with the construction of the 500kV transformer substation in the distant view.

In the prior art, transmission line tangent towers with different voltage levels all have corresponding tower structure requirements, and 220kV line towers cannot be used on 550kV lines, so that two schemes are provided for the problem: firstly, a new line corridor is opened up, and a brand new corresponding 500kV power transmission line is built to be accessed into a proposed 500kV transformer substation; and secondly, the existing 220kV line corridor is utilized to completely remove the original 220kV line towers, and a newly-built 500kV transmission line is accessed to a proposed 500kV transformer substation. However, the disadvantages of the above solutions are: 1. along with the development of economy and the construction of a power grid, land resources are increasingly scarce, and the difficulty of newly opening up a line corridor is high, the construction period is long, and the investment is high; 2. the original 220kV line tower has great dismantling amount, the lead and the ground wire need to be completely replaced, and the engineering construction is difficult to smoothly develop.

Disclosure of Invention

An object of the utility model is to provide a need not to open up circuit corridor, construction convenience, time limit for a project short, engineering volume is little, reduce the 220kV double loop transmission line tangent tower based on long-range view 500kV single loop of engineering investment greatly when long-range view construction according to prior art's weak point.

The purpose of the utility model is realized through the following ways:

the 220kV double-loop linear tower based on the 500kV single loop in the long view comprises a ground wire support, a tower head, a tower body, cross beams and three-phase double-loop wires, and is structurally characterized in that the tower head is of a cat-shaped structure and comprises an upper cross beam, vertical arched beams positioned on two sides of the upper cross beam and V-shaped supporting beams for supporting the two arched beams, the lower end parts of the V-shaped supporting beams are connected with the tower body, the upper cross beam, the two arched beams and the V-shaped supporting beams enclose a tower window, three hanging points are arranged in the tower window of the cat-shaped structure tower head and respectively positioned at the central point of the upper cross beam of the tower window and at the middle points of the upper arched beams on two sides of the tower window, two sets of V-shaped insulator strings with different lengths are arranged in the tower window, wherein the length of the long string is the same as that of the 500kV single loop I-shaped insulator string, one end of the long string of the two sets of V-shaped insulator strings; the cross arm comprises an edge cross arm and a lower cross arm, the edge cross arm is positioned below the arched beam and at the outer side part of the upper end of the V-shaped supporting beam and is fixedly connected with the V-shaped supporting beam, the lower cross arm is positioned at two side edges of the tower body below the tower head of the cat-shaped structure and is detachably connected with the tower body, and I-shaped insulator strings are arranged at the overhanging end parts of the edge cross arm and the lower cross arm; in the three-phase double-circuit lead, one phase is hung on the V-shaped insulator string, and the other two phases are respectively hung on the I-shaped insulator strings of the side cross arm and the lower cross arm; the ground wire brackets are positioned at two ends above the upper cross beam.

In the 220kV double-loop transmission line tangent tower in the period, V-shaped insulator strings with different lengths are specially designed, long string hanging points of two V-shaped insulator strings share the center point of an upper cross beam of a tower window, when a 500kV single loop is built in a distant view boosting mode, as the length of the long string meets the length requirement of a 500kV single-loop I-shaped string (the difference value between the lengths of the 220kV single-loop I-shaped strings and the 500kV suspension I-shaped strings is 2.5 m), short strings on two sides of the two V-shaped insulator strings are removed, the two long strings with the common hanging points are combined to form the I-shaped insulator string, and the I-shaped insulator string is suspended in the center of the tower window, so that the hanging point of one-phase lead. In the 220kV double-circuit transmission line tangent tower in the period, the lower cross arm is detachably connected with the tower body, so that when a 500kV single circuit is built in a long-range view boosting mode, the cross arms on two sides are reserved as wire hanging points of the other two phases of the 500kV single circuit, and the lower cross arm is detached. Therefore, in the 220kV double-loop power transmission line tangent tower in the period, the V-I mixed insulator string is used as a wire hanging point, the design of adopting a common hanging point, unequal-length V-shaped insulator string structures and safe distance is fully prepared for the distant view boosting construction of a 500kV single-loop I-shaped tangent tower, so that boosting can be completed only by simple transformation, the 220kV double-loop tower is boosted into the 500kV single-loop tower, a line corridor does not need to be opened up, construction is convenient, the construction period is short, the engineering quantity is small, and the engineering investment is greatly reduced.

The utility model discloses can further specifically do:

and the hanging wires of the V-shaped insulator strings, the side cross arms and the I-shaped insulator strings arranged on the lower cross arm in the tower window are double split wires.

According to the system transmission capacity, the 220kV double-loop power transmission line in the current period adopts double-split conductors, the 500kV long-range single loop can adopt a four-split conductor, the V-shaped insulator string in the tower window adopts doubling, and the double-loop double-split conductors are combined into a single-loop four-split conductor; for the I-shaped insulator string of the side cross arm, the lower cross arm wire is lifted, and the wire of the lower cross arm is lifted to the corresponding side cross arm, so that the wire is combined into a four-split wire. Therefore, no new lead is needed, and only doubling and lifting are needed during construction, so that the construction is convenient, the construction period is short, the engineering quantity is small, and the engineering investment is greatly reduced.

To sum up, the utility model provides a 220kV two return circuit transmission line tangent tower based on long-range view 500kV single loop adopts cat shape structure tower head, V-I mixed type insulator chain hangs the point as the wire, wherein unequal length V type insulator chain structure is located the tower window of cat shape structure tower head and adopts publicly to hang the point, the lower cross arm is for dismantling the connection, from top to bottom the layering sets up safe distance, the construction 500kV single loop I type string tangent tower that steps up provides structural transformation basis for the long-range view, make full use of former circuit corridor, need not to open up new circuit route, the land resource has been saved, and the construction is simple and convenient, the time limit for a project is short, the engineering volume is little, the engineering investment reduces greatly.

Drawings

Fig. 1 is the utility model discloses a 220kV double circuit transmission line tangent tower's schematic structure based on long-range view 500kV single circuit.

Fig. 2 is the structure schematic diagram of 500kV single loop I type cluster transmission line tangent tower after 220kV double loop V-I mixed cluster boosts.

The present invention will be further described with reference to the following examples.

Detailed Description

The best embodiment is as follows:

referring to the attached figure 1, the 220kV double-loop transmission line tangent tower based on a 500kV long-range single loop comprises a ground wire support 1, a tower head, a tower body 2, a cross arm and three-phase double-loop wires, wherein the tower head is of a cat-shaped structure and comprises an upper cross beam 3, vertical arched beams 4 positioned on two sides of the upper cross beam and V-shaped supporting beams 5 supporting the two arched beams 4, the lower end part of each V-shaped supporting beam 5 is connected with the tower body 2, the upper cross beam 3, the two arched beams 4 and the V-shaped supporting beams 5 enclose a tower window, three hanging points are arranged in a tower window of the tower head with the cat-shaped structure, the three hanging points are respectively positioned at the central point 6 of an upper beam of the tower window and the middle point 7 of an upper arched beam at two sides of the tower window, two sets of V-shaped insulator strings 8 with unequal lengths are arranged in the tower window, the length of the long string 81 is the same as that of the 500kV single-loop I-type insulator string, one end of the long string 81 of the two sets of V-type insulator strings is commonly hung at the central point 6 of the upper beam of the tower window, and one end of the short string 82 is respectively hung at the middle point 7 of the two upper arched beams 4. The cross arms comprise side cross arms 9 and lower cross arms 10, the side cross arms 9 are positioned below the arched beams 4, the outer side parts of the upper ends of the V-shaped supporting beams 5 are fixedly connected with the V-shaped supporting beams 5, the lower cross arms 10 are positioned on the two side edges of the tower body 2 below the tower head of the cat-shaped structure and are detachably connected with the tower body 2, and I-shaped insulator strings are arranged at the outer suspension end parts of the side cross arms 9 and the lower cross arms 10; in the three-phase double-circuit lead, one phase is hung on the V-shaped insulator string, and the other two phases are respectively hung on the I-shaped insulator strings of the side cross arm 9 and the lower cross arm 10; the ground wire brackets 1 are positioned at two ends above the upper cross beam 3. And the hanging wires of the I-shaped insulator strings arranged on the V-shaped insulator string 8, the side cross arm 9 and the lower cross arm 10 in the tower window are double split wires.

The utility model discloses a structural feature and its long-range view step up as the characteristic in 500kV single circuit as follows:

1) 220kV adopts cat shape two times tangent tower, arranges two sets of V-arrangement insulator chain in the cat shape tower head window, and two lower cross arms are arranged to the body of the tower, and two limit cross arms in addition, lower cross arm and limit cross arm adopt I shape insulator chain, have satisfied the two way arrangement mode of arranging perpendicularly of 220 kV.

2) The vertical distance between two side cross arms of the 220kV cat-shaped tower and two side cross arms arranged on the side of the tower body is designed to be 6.5m, the vertical distance between the lower lead and the ground after boosting meets the requirement (according to the regulation specification requirement, the distance between the 220kV single-circuit lead and the ground of the 550kV single-circuit lead is respectively 6.5m and 10.5m, and the difference value of the string length of the 220kV suspension I string and the string length of the 500kV suspension I string is considered to be 2.5 m), so the height of the iron tower does not need to be adjusted.

3) According to the transmission capacity of the system, 2-split 400mm2 section wires are adopted for 220kV, and 4-split 400mm2 section wires are adopted for 500 kV. During the construction of stepping up, V type cluster in the tower window is parallelly connected, and lower cross arm is demolishd and the wire on the lower cross arm lifts to the side cross arm, merges with the wire on the side cross arm, only needs from this to simply merge and carry the line, can realize that the wire of 220kV double circuit all is used for 500kV single circuit, need not newly to increase the wire. Meanwhile, the ground wire of the 220kV line can also be directly used for the 500kV line.

4) The 220kV double-loop V-I mixed string tangent tower can be boosted into a 500kV single-loop I-type suspension string tangent tower through simple transformation: when the linear tower is boosted in the current period, the wires hung on the two V-shaped insulator strings in the tower window are changed into the wires hung on the I-shaped insulator string in the center of the tower window, the other two side-phase wires are respectively hung on the side cross arms on the two sides of the cat-head tower, and the lower cross arm is removed.

5) The utility model discloses fully consider 220kV, 500kV circuit characteristics such as safe distance to ground, insulating cooperation, air gap, gold utensil and insulator cluster length, gold utensil cluster string wire mode, through limit cross arm and the high rational design in lower cross arm vertical layer for the iron tower highly need not to adjust after the transformation of stepping up, the equal reuse of wire, the ground wire of circuit, the former circuit corridor of make full use of need not to open up new circuit route, the valuable land resource has been saved, the engineering investment has been saved greatly.

The part of the utility model which is not described is the same as the prior art.

Claims (2)

1. The 220kV double-loop linear tower based on the 500kV single loop in the long view comprises a ground wire support, a tower head, a tower body, a cross arm and three-phase double-loop wires, and is characterized in that the tower head comprises an upper cross beam, vertical arched beams positioned on two sides of the upper cross beam and V-shaped supporting beams for supporting the two arched beams, the lower end parts of the V-shaped supporting beams are connected with the tower body, the upper cross beam, the two arched beams and the V-shaped supporting beams enclose a tower window, three hanging points are arranged in the tower window of the tower head and respectively positioned at the central point of the upper cross beam of the tower window and the middle points of the upper arched beams on two sides of the tower window, two sets of V-shaped insulator strings with different lengths are arranged in the tower window, wherein the length of the long string is the same as that of a 500kV single loop I-shaped insulator string, one end of the long string is commonly hung at the central point of the upper cross beam of the; the cross arms comprise side cross arms and lower cross arms, the side cross arms are positioned below the arched beams and at the outer side parts of the upper ends of the V-shaped supporting beams and fixedly connected with the V-shaped supporting beams, the lower cross arms are positioned at two side edges of the tower body below the tower head and detachably connected with the tower body, and I-shaped insulator strings are arranged at the overhanging end parts of the side cross arms and the lower cross arms; in the three-phase double-circuit lead, one phase is hung on the V-shaped insulator string, and the other two phases are respectively hung on the I-shaped insulator strings of the side cross arm and the lower cross arm; the ground wire brackets are positioned at two ends above the upper cross beam.

2. The 220kV double-circuit tangent tower based on the long-range 500kV single circuit as claimed in claim 1, wherein the conductors hooked by the V-shaped insulator strings, the I-shaped insulator strings arranged on the side cross arm and the lower cross arm in the tower window are double split conductors.

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