CN105735731B - A kind of double T connection steel pipe poles in double loop - Google Patents

Abstract

A double-circuit double-T-connected steel pipe pole, including a pole body. The pole body is sequentially provided with four layers of double-sided cross arms on the main circuit from top to bottom, wherein the first layer is a ground wire cross arm for hanging the ground. The second to fourth layers are the upper conductor cross arm, the middle conductor cross arm and the lower conductor cross arm respectively, which are respectively used to connect the upper phase, middle phase and lower phase conductors of the main circuit; the shaft is also provided with At least three cross arms on the double T connection circuit, from top to bottom are the branch ground wire cross arm, the branch wire upper jumper cross arm and the branch wire lower jumper cross arm, and the at least three double T connection circuits are The cross-arm is perpendicular to the plane where the four-layer double-sided cross-arm is located.

Description

A double-circuit double-T connected steel pipe rod

technical field

The invention relates to the field of erection of high-voltage transmission lines, in particular to a double-circuit double-T connected steel pipe pole.

Background technique

With the rapid development of the economy, the scale and density of transmission lines are also increasing. In order to save land resources, the main lines of high-voltage transmission lines are often erected with double circuits on the same tower (pole), and the branch lines T are connected to the main line. There are generally two ways to realize the T-connected double-circuit overhead line: one is to build a base double-circuit cable T-connected to the steel pipe pole under the existing double-circuit overhead line, and then use the cable climbing pole to T-connect the circuits on both sides; Under the double-circuit overhead line, build a new base of conventional double-circuit double-T connection steel pipe pole, and then use the jumper wire to jump to the T-connection circuit. In the first way, due to the use of cables, the project cost will increase. In addition, an overhead cable composite power network is formed, which not only increases the difficulty and cost of power grid operation and maintenance, but also reduces the reliability of power grid operation; The double-T steel pipe pole is based on the four-layer main line cross-arm of the conventional double-circuit steel pipe pole. In the T-joint direction and the main line cross-arm, four-layer T-joint cross-arms are added alternately, that is, one layer of main line cross-arm and one layer of T-joint. The cross-arms are arranged alternately. Since the upper cross-arms on the main line of the conventional double-circuit and double-T steel pipe poles are high in height, in order to ensure the safety of the line, it is often necessary to heighten the adjacent existing pole towers. This not only increases the difficulty of project implementation, but also raises the project cost.

In response to the above problems, Chinese patent application CN104563577A discloses a double T-bar for high-voltage lines. The upper conductor crossarm, the middle conductor crossarm, and the lower conductor crossarm are symmetrical from top to bottom on the vertical pole and are installed with lightning protection wire brackets at intervals, the upper conductor crossarm of the original line, the upper conductor crossarm of the double T line, and the original line Cross arm of medium conductor, cross arm of medium conductor of double T line, cross arm of lower conductor of original line and cross arm of lower conductor of double T line, lightning protection wire support, cross arm of upper conductor of original line, cross arm of middle conductor of original line, lower conductor of original line The cross arm and the upper conductor cross arm of the double-T line, the middle conductor cross-arm of the double-T line, and the lower conductor cross-arm of the double-T line are distributed in a cross, so that the original arrangement of the original line remains unchanged, but the vertical distance between the lines is doubled , and set the cross arm in the vertical direction of the cross arm of the original line so that the line is connected to the double T direction, the same loop line is connected in the air, different loop lines are connected in the air, and different loop lines are crossed in the air. The cable climbing pole is T-connected to the loops on both sides, which reduces the cost of the project and improves the reliability of the power grid operation. However, since the original arrangement of the main lines remains unchanged, the vertical distance between the lines has doubled, resulting in the upper layer The height of the cross arm increases, which increases the upward tension of the wires between the steel pipe poles. In order to ensure the safety of the line, it is necessary to heighten the adjacent existing pole towers, which also increases the difficulty of project implementation and project cost.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to overcome the increase in the gap height of the cross-arm of the double-circuit double-T connected steel pipe poles in the prior art, which continuously increases the upward pulling force between the wires between the steel pipe poles and the difficulty of project implementation and the increase in project cost. Big flaw.

In view of this, the present invention provides a double-circuit double-T connecting steel pole, which includes a shaft, and the shaft is sequentially provided with four layers of double-sided crossarms on the main circuit from top to bottom, wherein the first layer is the ground wire The cross arm is used to hang the grounding wire. The second to fourth layers are the upper layer wire cross arm, the middle layer wire cross arm and the lower layer wire cross arm, which are respectively used to connect the upper phase, middle phase and lower phase wires of the main circuit; The shaft is also provided with at least three cross-arms on the double T-connected circuit, which are the branch ground wire cross-arm, the branch wire upper-level jumper cross-arm and the branch wire lower-layer jumper cross-arm from top to bottom. The cross-arms on the three double T-connected circuits are perpendicular to the plane where the four-layer double-sided cross-arms are located.

Further, the branch ground wire cross arm is arranged on the upper end of the steel pipe shaft.

Further, the upper jumper cross-arm of the branch wire is arranged between the ground wire cross-arm and the upper-layer wire cross-arm and close to one side of the ground wire cross-arm.

Further, the lower layer jumper cross-arm of the branch wire is arranged below the lower-layer wire cross-arm, close to one side of the lower-layer wire cross-arm.

Further, the ground wire of the double T connection circuit connected to the steel pipe pole is connected to the ground wire of the main circuit through the branch ground wire cross arm, the shaft and the ground wire cross arm.

Further, an insulator and wires form a vertical shunt bus between the upper jumper cross-arm of the branch wire and the lower jumper cross-arm of the branch wire.

Further, the main circuit wire connected to the steel pipe pole is jumped to the vertical shunt bus through a jumper wire, and connected to the double T-connected circuit wire through the shunt bus through a jumper wire.

The present invention provides a double-circuit double-T connected steel pipe rod. The steel pipe rod is composed of four layers of double-sided cross-arms from top to bottom. There are at least three cross-arms arranged from top to bottom in the vertical plane of the plane where the cross-arms on both sides of the layer are located. It is used to lead out the double T connection circuit in the direction of double T connection. Under the state of ensuring the safe distance of each phase wire, by reducing the number of cross arms in the direction of double T connection, the main force of the double T connection steel pipe pole of the double circuit high voltage line can be reduced to the greatest extent. The height of the loop and the cross arm of the double T connection loop can reduce the upward tension of the wires between the steel pipe poles, the difficulty of project implementation and the cost of project cost.

Description of drawings

In order to make the content of the present invention more easily understood, the present invention will be described in further detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

Fig. 1 is a front view of the main circuit of a double-circuit double-T connected steel pipe rod provided by the embodiment of the present invention;

Fig. 2 is a front view of a T-connection circuit of a double-circuit double-T-connected steel pipe rod provided by an embodiment of the present invention;

Fig. 3 is a schematic plan view of a double-circuit double-T connected steel pipe rod provided by an embodiment of the present invention;

Fig. 4 is an enlarged schematic diagram of the details of area A of a double-circuit double-T-connected steel pipe pole in Fig. 3 .

Detailed ways

The embodiment of the present invention provides a double-circuit double-T connected steel pipe pole, as shown in Fig. Branch ground cross arm 6, branch wire upper jumper cross arm 7 and branch wire lower jumper cross arm 8,

Among them, the four-layer double-sided cross arm on the main circuit of the steel pipe pole, the ground wire cross arm 2 is used to hang the ground wire, and plays the role of lightning protection, the upper layer wire cross arm 3 is used to connect the upper phase wire, and the middle layer wire cross arm 4 is used For hooking the middle-phase wire, the lower-layer wire crossarm 5 is used for hooking the lower-phase wire. In the vertical plane of the plane where the four-layer double-side crossarm is located, at least three double T-connected loops are sequentially arranged from top to bottom. A cross arm, from top to bottom is the branch ground wire cross arm 6, the branch wire upper layer jumper cross arm 7 and the branch wire lower layer jumper cross arm 8, the four-layer double-side cross arm on the main circuit is connected with the described At least three cross-arms on the double T-connection circuit are vertically distributed in space.

The double-circuit double-T steel pipe pole provided in this embodiment reduces the number of cross-arms in the double-T-connection direction and reduces the height of the double-T steel pipe pole cross-arm for double-circuit high-voltage lines while ensuring the safe distance of the conductors of each phase. The difficulty of project implementation and the upward tension of the high-voltage wires between the steel pipe poles save the cost of the project.

Preferably, the branch ground wire cross arm 6 is arranged on the upper end of the steel pipe shaft 1, and the branch wire upper layer jumper wire arm 7 is arranged between the ground wire cross arm 2 and the upper layer wire cross arm 3 Between and close to the side of the ground wire cross-arm 2 , the lower jumper cross-arm 8 of the branch wire is arranged below the lower-layer wire cross-arm 5 and close to the side of the lower-layer wire cross-arm 5 .

Specifically, as shown in Figure 1 and Figure 2, the horizontal length and vertical distance of each cross-arm set in this embodiment are all within the safety threshold of high-voltage line energization, and the cross-arms in the direction of the main circuit and the direction of the double-T connection circuit are considered In the case of electrification safety and the height of the steel pipe pole shaft 1, the distance between the upper conductor cross arm 3, the middle conductor cross arm 4 and the lower conductor cross arm 5 of the main circuit is set to be the same as the existing main circuit steel pipe pole conductor cross arm spacing; For each cross arm in the direction of the double T connection circuit, since the ground wire is not charged, there is no limit to the distance between the ground wire cross arm 2 and the branch ground wire cross arm 6, as long as the space position of the ground wire cross arm 2 and the branch ground wire cross arm 6 is relatively opposite Just be vertical, the distance between the ground wire cross arm 2 and the upper layer jumper cross arm 7 of the branch wire is also not limited to the height as long as the space position is relatively vertical, and the distance between the lower layer jumper cross arm 8 of the branch wire and the lower layer wire cross arm 5 is within the above-mentioned It is within the range of the nominal height of the main line circuit of the steel pipe pole, that is, within the range of the distance between the lower conductor crossarm 5 of the steel pipe pole and the bottom of the shaft 1, so the distance between the lower jumper crossarm 8 of the branch conductor and the lower conductor crossarm 5 will not affect The height of the cross arm of the main line of the steel pipe rod in this embodiment, the distance between the lower jumper cross arm 8 of the branch wire and the lower wire cross arm 5 in this embodiment is 3.5m; The spacing varies due to differences in voltage levels or other factors. For the safety of high-voltage lines and the main circuit conductors can accurately jump to the shunt bus through the jumper wires. The pull-up force, in this embodiment, is preferably 2.5m when the voltage level is 110kv.

The double-circuit double-T connection steel pipe pole provided by the embodiment of the present invention ensures that each energized line is at a safe threshold, and by reducing the overall height of each cross-arm in the direction of the double-T connection circuit, the distance between the wires between the steel pipe poles in the main line direction is reduced. The upper pull force and the difficulty of project implementation and the cost of project cost.

Preferably, as shown in FIG. 3 , FIG. 4 is a partial enlarged view of area A in FIG. 3 , between the main circuit steel pipe rod 13 and the main circuit steel pipe rod 14 passing through the upper phase, middle phase and lower phase conductors of the main circuit double circuit line 18, 19, 20, 21, 22, 23 are connected to form a main circuit double-circuit line that requires T connection, and the double T connection loop steel pipe pole 11 and steel pipe pole 12 are also connected by wires to form a double T connection direction loop. The ground wire of the double T connection circuit is connected to the ground wire of the main circuit through the branch ground wire cross arm 6, the shaft 1 and the ground wire cross arm 2 to ensure the electrical connection of the ground wire. 7 and the jumper crossarm 8 of the lower layer of the branch wire form a shunt bus 9 in the vertical direction through the insulator 17 and the wire, and the main circuit wires 18, 19, 20, 21, 22, 23 jump to the above-mentioned On the single shunt busbar 9 in the vertical direction, the double T-connection circuit is drawn out by connecting the double-T-connection circuit wires through the said shunt-busbar via a jumper wire.

Specifically, the shunt busbar is composed of upper and lower insulators connected with wires, and the number of shunt busbars can be 3 or 6. According to the requirements of different high-voltage transmission lines, for example, if it is a T-connection single circuit, the number of shunt busbars can be set as 3, in consideration of the uniform stress of the steel pipe pole, two shunt busbars and one shunt busbar can be installed on both sides of the steel pipe pole; Three shunt busbars are used to ensure uniform stress. The shunt busbars on each side are respectively connected to the phase wires of a main circuit through jumpers. Without considering the cost, the steel pipe poles with 6 shunt busbars can also use 3 of them for T is connected to a single-circuit line. In this embodiment, steel pipe poles are preferably provided with 6 shunt busbars. As shown in Figure 2, there are 6 shunt busbars arranged on the steel pipe pole, which are symmetrically distributed on both sides of the pole body 1 respectively. The method is as follows: 6 shunt bus bars are connected to the main circuit wires 20, 19, 18, 23, 22, and 21 via jumper wires from left to right, and then connected to the double-T circuit wires via jumper wires.

The double-circuit double-T connected steel pipe pole provided by the above-mentioned embodiment reduces the number of cross-arms in the direction of the double-T connected circuit under the premise of ensuring the safety of the high-voltage line, reduces the height of the steel pipe pole and the steel pipe pole between the main circuit steel pipe pole conductors. The increased height results in a pull-up force on the conductor, which improves the reliability of the power grid operation.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (5)

1. a kind of double T connection steel pipe poles in double loop, which is characterized in that including shaft, the shaft is disposed with master from top to bottom Four layers of bilateral cross-arm on circuit, wherein first layer are ground wire cross-arm, are used for hanging earthing conductor, second to the 4th layer is followed successively by upper layer Conducting wire cross-arm, middle layer conductor cross-arm and lower layer conductor cross-arm are respectively used to upper phase, middle phase and the lower phase conductor of mounting major loop；

The shaft is additionally provided with the cross-arm that at least three couples of T take back road, is followed successively by branch's ground wire cross-arm, branch from top to bottom Conducting wire upper layer wire jumper cross-arm and offset lower layer wire jumper cross-arm, at least three couples of T take back the cross-arm of road perpendicular to institute The plane where four layers of bilateral cross-arm is stated, branch's ground wire cross-arm is arranged in the upper end of the rod body of steel pipe rod, the branch Conducting wire upper layer wire jumper cross-arm is arranged between the ground wire cross-arm and the topping wire cross-arm and close to the ground wire cross-arm one Side.

2. the double T connection steel pipe poles in double loop according to claim 1, which is characterized in that offset lower layer wire jumper is horizontal Load is arranged below the lower layer conductor cross-arm, close to the lower layer conductor cross-arm side.

3. the double T connection steel pipe poles in double loop according to claim 2, which is characterized in that the double T being connected on the steel pipe pole Loop ground is connect by branch's ground wire cross-arm, shaft and ground wire cross-arm to be connected with major loop ground wire.

4. the double T connection steel pipe poles in double loop according to claim 3, which is characterized in that offset upper layer wire jumper is horizontal The shunting busbar of vertical direction is made up of between load and the offset lower layer wire jumper cross-arm insulator and conducting wire.

5. the double T connection steel pipe poles in double loop according to claim 4, which is characterized in that the master being connected on the steel pipe pole Return wire skips on the shunting busbar of the vertical direction through wire jumper and connects double T through wire jumper by the shunting busbar and takes back Line conductor.