CN105244834A - Double-circuit overhead power transmission line double-T wiring tower and wiring structure thereof - Google Patents

Abstract

The invention relates to a double-T wiring tower and a wiring structure for a double-circuit overhead transmission line. The wiring tower of the invention includes a vertical steel pipe tower, and the vertical steel pipe tower is provided with 7-layer cross arms from top to bottom, two, three, The four-story cross arm is set on the tower surface on the side of the main circuit I, and the cross arm on the fifth, sixth, and seventh floors is set on the tower surface on the main circuit II side opposite to the main circuit I. Main circuit II cross arm, there are 6 cross arms from top to bottom on the tower surface outside the corner of main line I and II, among them, the main circuit I outlet cross arm corresponding to the second, third and fourth floor cross arms, and the five The sixth and seventh floor cross arms correspond to the T-shaped outgoing line cross arms of the main circuit II. The invention realizes double-circuit reverse double-T connection off-line on the same tower, and solves the problem of double-T connection off-line at the same time when the double circuit is at the corner. Timely difficulty, high cost and great impact on the surrounding environment.

Description

A double-T connection tower and connection structure for a double-circuit overhead transmission line

technical field

The invention relates to a double-T junction tower and a junction structure of a double-circuit overhead power transmission line, belonging to the technical field of high-voltage power transmission.

Background technique

In recent years, with the rapid development of the national economy and the acceleration of urbanization, the power load in urban areas is increasing day by day. The surrounding environment of the newly built 110kV substation located in the urban area is complex, with winding and narrow passageways, many underground pipelines, and lines The location of the pole tower is limited, and the overhead lines in urban areas are usually erected with double-circuit or multiple-circuit lines on the same tower. The substations in urban areas mostly use π connection or double T connection to connect existing (or new) lines to power lines; due to channel restrictions, substations The site selection is mostly close to the existing (or new) transmission lines. When the double-T wiring method is used to connect the T to the double-circuit line on the same tower, because the terminal tower is relatively close to the substation, the conventional cross-arm wiring method cannot meet the T-connection requirements. The need for wire stalls to be directly connected to the substation will make it more difficult to implement the overhead T connection when the main circuit turns at the same time. The commonly used method is to newly establish two overhead terminal towers to realize two single T off-lines or use cable lines Among them, the cable drilling scheme not only has a large initial investment in construction, but also has high operation and maintenance costs in the future, which is difficult and expensive; and for the new two-base overhead terminal tower scheme, not only the initial investment is huge, the cost is high, The impact on the surrounding environment is relatively large, and it is often impossible to implement due to the impact of the surrounding environment.

Contents of the invention

The purpose of the present invention is to provide a double-T connection tower and a connection structure of a double-circuit overhead transmission line, so as to solve the problems of difficulty, high cost and great impact on the surrounding environment when the double-circuit is connected at the same time as the corner. .

In order to solve the above technical problems, the present invention provides a double-T connection tower for double-circuit overhead transmission lines. The connection tower includes a vertical steel pipe tower. 4. The four-story cross arm is set on the tower surface on the side of the main circuit I. The cross arm of the main circuit I is used to connect the incoming lines and T-shaped outgoing lines of the main circuit I. The cross arms on the fifth, sixth, and seventh floors Set on the tower surface on the main circuit II side opposite to the main circuit I, the main circuit II cross arm is used to connect the incoming and outgoing lines of the main circuit II, and the tower surface outside the corner of the main circuit I and II is from the top There are also 6 cross-arms from the bottom, corresponding to the six cross-arms on the second to seventh floors. Corresponding to the main circuit I outlet crossarm, used to articulate the outlet of the main circuit I, and the T-shaped outlet crossarm corresponding to the fifth, sixth, and seventh floors of the main circuit II, used to articulate the main circuit II T-shaped outgoing line, the length of each cross-arm can be determined according to the position of the hanging line and the width of the corresponding tower body at the same time. It is necessary to ensure that the clearance distance between each hanging line position is not less than twice the leakage distance.

Each of the cross-arms includes an inner corner and an outer corner. The inner corner of the cross-arm of the main circuit I is the incoming line support angle, which is used to connect the incoming line of the main circuit I and the T-shaped outgoing line of the main circuit I. The angle is the jumper support angle; the inner corner of the main circuit I outlet crossarm is the jumper support angle, and the outer corner is the main circuit I outlet support angle; the inner corner of the main circuit II crossarm is the inlet and outlet support angle, which is used for hooking For the incoming and outgoing lines of the main circuit II, the outer corner is the jumper support angle, the inner corner of the T-shaped outgoing line crossarm of the main circuit II is the jumper support angle, and the outer corner of the T-shaped outgoing line crossarm of the main circuit II is T-shaped The outlet angle is used to connect the T-shaped outlet of the main circuit II.

The installation positions of the second, third, and fourth-layer cross-arms relative to the vertical direction of the tower are the same, so as to ensure that the wire clearance distance between different phases of the line loops hanging on the above-mentioned three-layer cross-arms is not less than twice the creepage distance.

That is, the first layer of cross arms of the vertical steel pipe tower is used to hang the ground wire.

The vertical distance between the cross arm of the fourth layer and the cross arm of the fifth layer is greater than the vertical distance between other adjacent layers, so as to ensure that the vertical distance between other adjacent layers is the same and not less than twice the creepage distance.

The present invention also provides a wiring structure for a double-T wiring tower of a double-circuit overhead power transmission line. The four-story cross arm is set on the tower surface on the side of the main circuit I, the main circuit I cross arm, and the main circuit I cross arm is connected with each phase incoming line and T-shaped outgoing line of the main circuit I, five, six, seven The cross arm of the floor is set on the tower surface of the main circuit II side opposite to the main circuit I, the main circuit II cross arm, the main circuit II cross arm is connected to the incoming and outgoing lines of the main circuit II, and the corners of the main lines I and II There are also 6 cross arms from top to bottom on the outer tower surface, corresponding to the six cross arms on the second to seventh floors respectively. The third and fourth floor crossarms correspond to the main circuit I outlet crossarms, the main circuit I outlet crossarms are connected with the main circuit I outlets, and the fifth, sixth and seventh floor crossarms correspond to the T-shaped main circuit II Outlet cross-arm, the T-shaped outlet cross-arm of the main circuit II is connected with the T-shaped outlet of the main circuit II, the length of each cross-arm can be determined by accumulating the width of the tower corresponding to the height at the same time according to the position of the hanging line. It is necessary to ensure that the clearance distance between each hanging position is not less than twice the creepage distance.

Each of the cross arms includes an inner corner and an outer corner. The inner corner of the main circuit I cross arm is an incoming line support angle, and the incoming line of the main circuit I and the T-shaped outgoing line of the main circuit I are connected. The outer corner is the jumper support angle, which is connected with the jumper of the main circuit I; the inner corner of the main circuit I outlet crossarm is the jumper support angle, connected with the jumper of the main circuit I, and the outer corner is the support angle of the main circuit I outlet , the outgoing line of the main circuit I is connected; the inner corner of the cross arm of the main circuit II is the supporting angle of the incoming and outgoing lines, and the incoming and outgoing lines of the main circuit II are connected, and the outer corner is the jumper supporting angle, and the main circuit II is connected jumper, the inner corner of the T-shaped outlet crossarm of the main circuit II is the jumper support angle, and the jumper of the main circuit II is connected, and the outer corner of the T-shaped outlet crossarm of the main circuit II is the T-shaped outlet angle. Connect the T-shaped outgoing line of the main circuit II.

The installation positions of the second, third, and fourth-layer cross-arms relative to the vertical direction of the tower are the same, so as to ensure that the wire clearance distance between different phases of the line loops hanging on the above-mentioned three-layer cross-arms is not less than twice the creepage distance.

The first floor of the vertical steel pipe tower is hung with a ground wire.

The vertical distance between the cross arm of the fourth layer and the cross arm of the fifth layer is greater than the vertical distance between other adjacent layers, so as to ensure that the vertical distance between other adjacent layers is the same and not less than twice the creepage distance.

The beneficial effect of the present invention is: the wiring tower of the present invention comprises a vertical steel pipe tower, and this vertical steel pipe tower is provided with 7 layers of cross arms from top to bottom, and the cross arms of the second, third and fourth floors are arranged on the main circuit I side On the tower surface of the main circuit, the main circuit I cross arm is used to connect the incoming lines and T-shaped outgoing lines of the main circuit I. The cross arms on the fifth, sixth and seventh floors are set on the main circuit II side opposite to the main circuit I. On the tower surface of the main circuit II, the cross arm of the main circuit is used to connect the incoming and outgoing lines of the main circuit II. On the tower surface outside the corner of the main circuit I and II, there are 6 cross arms from top to bottom, which are respectively connected with the two Corresponding to the six cross arms on the seventh floor, each corresponding cross arm is in the same plane and forms an angle of 90 degrees between them. Among them, the main circuit I outlet cross arm corresponding to the second, third, and fourth floor cross arms is used Connect the outgoing line of the main circuit I, and the T-shaped outgoing line of the main circuit II corresponding to the fifth, sixth, and seventh-layer cross-arms are used to connect the T-shaped outgoing lines of the main circuit II. The length of each cross-arm is equal to According to the positions of the hanging wires, the width of the tower corresponding to the height is simultaneously accumulated to ensure that the clearance distance between the hanging wire positions is not less than twice the leakage distance The double-T connection off-line solves the problems of difficulty, high cost and great impact on the surrounding environment when the double-circuit is turned and the double-T connection is off-line at the same time.

Description of drawings

Fig. 1 is the front view of double-T terminal tower structure of double-circuit overhead power transmission line of the present invention;

Fig. 2 is the side view of double-T terminal tower structure of double-circuit overhead transmission line of the present invention;

Fig. 3 is the plan view (1) of double-T connection tower structure of double-circuit overhead power transmission line of the present invention;

Fig. 4 is the top view (2) of double-T connection tower structure of double-circuit overhead transmission line of the present invention;

Fig. 5 is the plan view (3) of double-T terminal tower structure of double-circuit overhead power transmission line of the present invention;

Fig. 6 is a diagram of the wiring structure of the double-T wiring tower of the double-circuit overhead transmission line in the embodiment of the present invention.

detailed description

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

An embodiment of a double-T connection tower for a double-circuit overhead transmission line of the present invention

The double-T connection tower of the double-circuit overhead transmission line in this embodiment is shown in Figure 1, which includes a vertical steel pipe tower with four columns on a base, and seven layers of double-side hanging wire crossarms are arranged on the steel pipe tower in sequence from high to low. The first layer is used to connect the ground wire, the second to fourth layers are respectively used to connect the three-phase wires of the main circuit I, the fifth to the seventh layers are respectively used to connect the three-phase wires of the main circuit II, the second, third, The four-story cross arm is set on the tower surface on the side of the main circuit I, and the main circuit I cross arm, the second, third, and fourth-story cross arms are installed in the same position relative to the vertical direction of the tower body, ensuring that the cross arms hanging on the above-mentioned three-story cross arm The wire clearance distance between different phases of the line loop is not less than twice the leakage distance; the crossarms on the fifth, sixth, and seventh floors are set on the tower surface on the side of the main circuit II opposite to the main circuit I, and the main circuit II crossarms , the fifth, sixth, and seventh-story cross-arms are installed in the same position relative to the vertical direction of the tower body, ensuring that the wire clearance distance between different phases of the line loops hanging on the above-mentioned three-story cross-arm is not less than twice the creepage distance. The vertical distance between the cross arm of the fourth layer and the cross arm of the fifth layer is greater than the vertical distance between other adjacent layers, so as to ensure that the vertical distance between other adjacent layers is the same and not less than twice the creepage distance. There are 6 cross-arms from top to bottom on the tower outside the corner of the main line I and II, corresponding to the six cross-arms on the second to seventh floors respectively, and the corresponding cross-arms are in the same plane with 90 degrees between them. Angle, as shown in Figure 2-5, where the main circuit I outlet cross arm corresponding to the second, third, and fourth floor cross arms is used to connect the main circuit I outlet line, and the fifth, sixth, and seventh floor cross arms Corresponding to the T-shaped outlet crossarm of the main circuit II, used to connect the T-shaped outlet of the main circuit II. The installation positions of the second, third and fourth-layer cross-arms relative to the vertical direction of the tower body are the same, so as to ensure that the wire clearance distance between different phases of the line loops hanging on the above-mentioned three-layer cross-arms is not less than twice the leakage distance.

Each cross arm includes an inner corner and an outer corner. The inner corner of the cross arm of the main circuit I is the incoming line support angle, which is used to connect the incoming line of the main circuit I and the T-shaped outgoing line of the main circuit I. The outer corner is Jumper support angle; the inner corner of the main circuit I outlet crossarm is the jumper support angle, and the outer corner is the main circuit I outlet support angle; the inner corner of the main circuit II crossarm is the incoming and outgoing line support angle, which is used to connect the main circuit For the incoming and outgoing lines of II, the outer corner is the jumper support angle, the inner corner of the T-shaped outgoing line crossarm of the main circuit II is the jumper support angle, and the outer corner of the T-shaped outgoing line crossarm of the main circuit II is the T-shaped outgoing line angle , used to connect the T-shaped outlet of the main circuit II.

The main circuit I enters the line through the inner corner of the cross arm of the main circuit I, and realizes the T-shaped outgoing line of the main circuit I through this corner, and the main circuit I passes through the outer corner of the main circuit I cross arm and the inner corner of the main circuit I outlet cross arm After jumping, reach the outer corner of the main circuit I outlet cross-arm, and realize the outlet of the main circuit I through this corner; the main circuit II enters the wire through the inner corner of the main circuit II cross-arm, and realizes the outlet of the main circuit II through this corner, Main circuit II The outer corner of the main circuit II cross-arm and the inner corner of the T-shaped outlet cross-arm of the main circuit II jump to the outer corner of the T-shaped outlet cross-arm of the main circuit II, and the outer corner of the main circuit II is realized. T-shaped outlet. Through the structure of the double-T connection tower of the above-mentioned double-circuit overhead transmission line, it is ensured that when the two main circuits are turned, the two T-connected circuits are off-line in the opposite direction of the main circuit. And this structure compresses the horizontal distance between conductor and ground wire to the greatest extent, and makes full use of the limited line channel; the jumper wire adopts single-phase wire through the specially designed jumper cross-arm, and is arranged horizontally, and the wires of each phase are parallel to the direction of the main line. Arrangement, the structure of the wiring tower of the present invention is clear, and through the reasonable arrangement of multi-layer cross-arms, the dual-circuit reverse T is connected to the substation at the same time as the main line is turned, and the simultaneous reverse double-T of the double-circuit steering is solved. It is difficult and expensive to connect offline, and it is impossible to connect the terminal to the substation in an overhead way when the channel is limited.

An embodiment of the wiring structure of a double-T wiring tower for a double-circuit overhead transmission line of the present invention

The wiring structure of the double-T wiring tower of the double-circuit overhead transmission line in this embodiment is shown in Figure 6, which includes a base and four-column vertical steel pipe tower. Bearing, the ground wire is connected on the first floor, the three-phase conductors of the main circuit I are respectively connected on the second to the fourth floors, the three-phase conductors of the main circuit II are respectively connected on the fifth to the seventh floors, and the second, third and fourth floors The cross arm of the main circuit is set on the tower surface on the side of the main circuit I, and the main circuit I cross arm is connected with the incoming lines and T-shaped outgoing lines of the main circuit I. On the tower surface on the side of the main circuit II opposite to the circuit I, the cross arm of the main circuit II is connected with the incoming and outgoing lines of the main circuit II. The vertical distance between the fourth floor cross arm and the fifth floor cross arm is larger than other The vertical spacing between adjacent layers ensures that the vertical spacing between other adjacent layers is the same and not less than twice the creepage distance. The tower outside the corner of the main line I and II is also provided with 6 cross-arms from top to bottom, corresponding to the six cross-arms on the second to seventh floors, and each corresponding cross-arm is in the same plane with a 90-degree angle between them. Corner, where the main circuit I outlet cross arm corresponding to the second, third and fourth floor cross arms is connected with the outlet line of the main circuit I, and the T-shaped outlet line of the main circuit II corresponding to the fifth, sixth and seventh floor cross arms The cross arm is connected to the T-shaped outgoing line of the main circuit II. The installation positions of the second, third and fourth-layer cross-arms relative to the vertical direction of the tower body are the same, so as to ensure that the wire clearance distance between different phases of the line loops hanging on the above-mentioned three-layer cross-arms is not less than twice the leakage distance.

Each cross arm includes an inner corner and an outer corner. The inner corner of the cross arm of the main circuit I is the incoming line support angle, which is connected with the incoming line of the main circuit I and the T-shaped outgoing line of the main circuit I, and the outer corner is the jumper. The wire support angle is connected with the jumper wire of the main circuit I; the inner corner of the main circuit I outlet crossarm is the jumper wire support angle, and the jumper wire of the main circuit I is connected with the outer corner. The outgoing line of the main circuit I is connected; the inner corner of the cross arm of the main circuit II is the supporting angle of the incoming and outgoing lines, which is connected with the incoming and outgoing lines of the main circuit II, and the outer corner is the supporting angle of the jumper, which is connected with the jumper of the main circuit II. The inner corner of the T-shaped outlet crossarm of the main circuit II is the jumper support angle, and the jumper of the main circuit II is connected, and the outer corner of the T-shaped outlet crossarm of the main circuit II is the T-shaped outlet angle. There is a T-shaped outlet of the main circuit II.

The main circuit I enters the line through the inner corner of the cross arm of the main circuit I, and realizes the T-shaped outgoing line of the main circuit I through this corner, and the main circuit I passes through the outer corner of the main circuit I cross arm and the inner corner of the main circuit I outlet cross arm After jumping, reach the outer corner of the main circuit I outlet cross-arm, and realize the outlet of the main circuit I through this corner; the main circuit II enters the wire through the inner corner of the main circuit II cross-arm, and realizes the outlet of the main circuit II through this corner, Main circuit II The outer corner of the main circuit II cross-arm and the inner corner of the T-shaped outlet cross-arm of the main circuit II jump to the outer corner of the T-shaped outlet cross-arm of the main circuit II, and the outer corner of the main circuit II is realized. T-shaped outlet. Through the wiring structure of the double-T terminal towers of the above-mentioned double-circuit overhead transmission line, it is ensured that when the two main circuits are turned, the two T-connected circuits are off-line in the opposite direction of the main circuit.

Claims (10)

1. A double-T connection tower for double-circuit overhead transmission lines is characterized in that the connection tower includes a vertical steel pipe tower, and the vertical steel pipe tower is provided with 7 layers of cross arms from top to bottom, and the second, third, and fourth floors The crossarm of the main circuit I is set on the tower surface on the side of the main circuit I. The crossarm of the main circuit I is used to connect the incoming lines and T-shaped outgoing lines of the main circuit I. The crossarms on the fifth, sixth and seventh floors are set on the same On the tower surface of the main circuit II side opposite to the main circuit I, the main circuit II crossarm is used to connect the incoming and outgoing lines of the main circuit II. The tower surface outside the corner of the main circuit I and II is connected from top to bottom. There are 6 cross-arms, which correspond to the six cross-arms on the second to seventh floors, and each corresponding cross-arm is in the same plane with a 90-degree angle between them, among which the cross-arms corresponding to the second, third, and fourth floors are The main circuit I outlet cross arm is used to connect the main circuit I outlet, and the T-shaped outlet cross arm of the main circuit II corresponding to the fifth, sixth, and seventh floor cross arms is used to connect the T-shaped outlet of the main circuit II , the length of each cross-arm can be determined according to the positions of the hanging wires and the width of the corresponding height of the tower at the same time. It is necessary to ensure that the clearance distance between the hanging wire positions is not less than twice the leakage distance. 2. double-circuit overhead transmission line double T connection tower according to claim 1, it is characterized in that, all include inner corner and outer corner on described each cross arm, the inner corner of main circuit 1 cross arm is incoming line The support angle is used to connect the incoming line of the main circuit I and the T-shaped outgoing line of the main circuit I. The outer corner is the jumper support angle; the inner corner of the main circuit I outlet crossarm is the jumper support angle, and the outer corner is the main circuit. I outlet support angle; the inner corner of the main circuit II crossarm is the inlet and outlet support angle, which is used to connect the inlet and outlet of the main circuit II, and the outer corner is the jumper support angle, and the T-shaped outlet crossarm of the main circuit II The inner corner is the jumper support angle, and the outer corner of the T-shaped outlet crossarm of the main circuit II is the T-shaped outlet angle, which is used to connect the T-shaped outlet of the main circuit II. 3. The double-T junction tower for double-circuit overhead transmission lines according to claim 2, characterized in that the installation positions of the second, third and fourth-layer cross-arms relative to the vertical direction of the tower body are the same, ensuring that they are hung on the above-mentioned three-layer The wire clearance distance between different phases of the cross-arm circuit loop is not less than twice the creepage distance. 4. The double-T connection tower for double-circuit overhead transmission lines according to any one of claims 1-3, wherein the first-layer crossarm of the vertical steel pipe tower is used to hang the ground wire. 5. The double-T junction tower for double-circuit overhead transmission lines according to claim 4, characterized in that, the vertical distance between the cross arm of the fourth layer and the cross arm of the fifth layer is greater than the vertical distance between other adjacent layers, To ensure that the vertical spacing between other adjacent layers is the same and not less than twice the creepage distance. 6. A connection structure for a double-T connection tower of a double-circuit overhead transmission line, characterized in that the connection structure comprises a vertical steel pipe tower, and the vertical steel pipe tower is provided with 7 layers of cross arms from top to bottom, two, three 1. The four-story cross arm is set on the tower surface of the main circuit I side, the main circuit I cross arm, and the main circuit I cross arm is connected with each phase incoming line and T-shaped outgoing line of the main circuit I, five, six, The seven-story cross arm is set on the tower surface on the side of the main circuit II opposite to the main circuit I. The cross arm of the main circuit II is connected to the incoming and outgoing lines of the main circuit II. The main lines I and II There are 6 cross-arms from top to bottom on the tower outside the corner, corresponding to the six cross-arms on the second to seventh floors respectively. The second, third and fourth floor crossarms correspond to the main circuit I outlet crossarms, the main circuit I outlet crossarms are connected with the main circuit I outlets, and the fifth, sixth and seventh floor crossarms correspond to the T of the main circuit II The T-shaped outlet cross-arm of the main circuit II is connected with the T-shaped outlet of the main circuit II. The length of each cross-arm can be determined by accumulating the width of the tower corresponding to the height at the same time according to the position of the hanging wire , it is necessary to ensure that the clearance distance between each hanging position is not less than twice the creepage distance. 7. the wiring structure of the double-T junction tower of the double-circuit overhead transmission line according to claim 6, is characterized in that, on the described each cross-arm, all include inside angle and outside angle, the inside angle of main circuit I cross-arm It is the support angle of the incoming line, which is connected with the incoming line of the main circuit I and the T-shaped outgoing line of the main circuit I, and the outer corner is the supporting angle of the jumper, which is connected with the jumper of the main circuit I; The angle is the support angle of the jumper, which is connected with the jumper of the main circuit I, and the outer corner is the support angle of the outgoing line of the main circuit I, which is connected with the outgoing line of the main circuit I; the inner angle of the cross arm of the main circuit II is the support angle of the incoming and outgoing lines. The incoming and outgoing lines of the main circuit II are connected, the outer corner is the jumper support angle, the jumper of the main circuit II is connected, and the inner corner of the T-shaped outlet crossarm of the main circuit II is the jumper support angle, and the There is a jumper for the main circuit II, and the outer corner of the T-shaped outlet crossarm of the main circuit II is the T-shaped outlet corner, and the T-shaped outlet of the main circuit II is connected. 8. The wiring structure of the double-T wiring tower of the double-circuit overhead transmission line according to claim 7, characterized in that, the installation positions of the two-, three-, and four-layer cross-arms relative to the vertical direction of the tower body are the same, ensuring that they are hung on The wire clearance distance between the different phases of the circuit loop of the above-mentioned three-layer cross-arm is not less than twice the creepage distance. 9. The connection structure of the double-T connection tower of the double-circuit overhead transmission line according to any one of claims 6-8, characterized in that, the first layer of the vertical steel pipe tower is hung with a ground wire. 10. The wiring structure of double-T junction towers for double-circuit overhead transmission lines according to claim 9, characterized in that, the vertical distance between the cross arms of the fourth layer and the cross arms of the fifth layer is greater than that between other adjacent layers Vertical spacing to ensure that the vertical spacing between other adjacent layers is the same and not less than twice the creepage distance.