CN205046930U - Positive negative phase sequence of single loop transform angle -steel tower - Google Patents

Abstract

A single-circuit positive and negative phase sequence conversion angle steel tower. It includes the tower body, the top floor cross arm, the middle layer conductor cross arm, and the lower layer conductor cross arm. The middle layer conductor cross arm is T-shaped. One auxiliary cross-arm is arranged facing the large side; the lower conductor cross-arm is T-shaped, and two side cross-arms are arranged perpendicular to the direction of the target line from the tower body, and one auxiliary cross-arm is arranged facing the small side from the direction parallel to the target line of the tower body . The utility model adopts a base pole tower to solve the problem of forward and reverse phase sequence conversion of a single circuit, and at the same time avoids the deviation of the vertical state of the wire suspension string of the adjacent single circuit straight tower.

Description

A single-circuit positive and negative phase sequence conversion angle steel tower

Technical field:

The utility model relates to the technical field of high-voltage transmission lines, in particular to a single-circuit positive and negative phase sequence conversion angle steel tower.

Background technique:

In high-voltage transmission lines, due to the frequent occurrence of the phase sequence of the substations at both ends, one positive and one reverse, and multiple conversions between single and double circuits, the phase sequence of the substation is often inconsistent with the access phase sequence, resulting in the failure of normal power transmission. , so it is necessary to transform the phase sequence of the line to ensure the consistency of the phase sequence. Normally, the transmission lines start from the substation frame on the power supply side and end at the substation frame on the receiving side, and are numbered in the forward direction facing the substation frame on the receiving side. The power supply side is the small side, and the receiving side is the large side. There are the following three situations on both sides of the newly built angle steel tower, 1) small side angle steel tower and large side angle steel tower; 2) small side angle steel tower and large side angle steel tower; 3) small side angle steel tower and large side angle steel tower Substation architecture.

Affected by factors such as system scheme and site environment, the position of positive and negative phase sequence transformation can be divided into two types: intermediate transformation and terminal transformation. Angle steel tower; terminal transformation refers to the angle steel tower and substation frame on both sides of the positive and negative phase sequence transformation point.

The existing single-circuit forward and reverse phase sequence conversion method is mainly realized by the single-side cross arm of the double-circuit angle steel tower, and the specific method is as follows.

1) For the intermediate conversion, connect the middle phase wire of the single-circuit angle steel tower on the small side to the middle phase of the angle steel tower on the large side through the upper cross arm of the double-circuit angle steel tower, and connect the side phase of the single-circuit angle steel tower on the small side to the double circuit The middle phase or the lower phase of the angle steel tower is connected to the phase on the other side of the angle steel tower on the small side.

2) For terminal transformation, connect the middle phase of the substation frame to the middle phase of the single-circuit angle steel tower on the small side or the large side through the upper cross arm of the double-circuit angle steel tower, and connect the side phases of the substation frame through the middle phase of the double-circuit angle steel tower or The lower phase is connected to the other phase of the single-circuit angle steel tower on the small side or the large side.

In the above method, the wires at the double-circuit angle steel towers are arranged vertically, and the wires at the single-circuit angle steel towers are arranged in a triangle, which may easily cause the suspension string of adjacent single-circuit straight towers to deviate from the vertical state. When the electrical clearance does not meet the requirements, it is necessary to Reconstruction of adjacent towers will result in a substantial increase in construction costs and floor area.

In the above method, only the single-side cross arm of the double-circuit tension tower is used, and the tip of the single-side cross-arm of the double-circuit angle steel tower is usually used as the line center. The center of the line is inconsistent with the center of the tower, which is not convenient for measurement and positioning.

Invention content:

The purpose of this utility model is to provide a single-circuit positive and negative phase sequence conversion angle steel tower, which uses a base tower to solve the problem of single-circuit positive and negative phase sequence conversion, and at the same time avoids the deviation of the vertical line of the adjacent single-circuit straight tower wires. state.

In order to solve the problems existing in the background technology, the utility model adopts the following technical scheme: it includes a tower body, a top-level ground wire cross-arm, a middle-level wire cross-arm, and a lower-level wire cross-arm, and the top of the tower body is provided with a top-level ground wire cross-arm , a middle layer wire cross arm is arranged under the top ground wire cross arm, and a lower layer wire cross arm is arranged under the middle layer wire cross arm;

The middle conductor cross-arm is T-shaped, two cross-arms are arranged perpendicular to the direction of the target line from the tower body, and one auxiliary cross-arm is arranged from the tower body parallel to the direction of the target line facing the large side;

The lower conductor cross-arm is T-shaped, two cross-arms are arranged perpendicular to the direction of the target line from the tower body, and one auxiliary cross-arm is arranged from the tower body parallel to the direction of the target line facing the trumpet side.

Hard jumper strings with support tubes are hung under the auxiliary cross-arm on one side of the middle-level conductor cross-arm and the lower-level conductor cross-arm arranged from the tower body parallel to the direction of the target line.

Compared with prior art solutions, the present invention has the following advantages:

(1) Compared with the existing single-circuit positive and negative phase sequence conversion scheme, the scheme of the present invention fully considers the arrangement of the front and rear conductors, the impact on adjacent towers, reasonably arranges the conductor cross-arm, avoids the change of the conductor arrangement, and avoids the adjacent poles. The suspension string of the single-circuit straight tower conductor deviates from the vertical state.

(2) Compared with the existing single-circuit positive and negative phase sequence transformation scheme, the pole tower conductor cross arm of the present invention is symmetrical, the structure is more stable, and it is convenient for measurement and positioning.

(3) A hard jumper string with a support tube is hung under the auxiliary cross-arm, and the jumper string is hung under the cross-arm on the side opposite to the auxiliary cross-arm. This design effectively controls the wind deflection of the jumper and reduces the Cross arm size.

(4) Reasonably design the direction of the auxiliary cross-arm and the position of the wire suspension point to ensure the electrical distance between the auxiliary cross-arm and the wire, and reduce the size of the cross-arm.

Description of drawings:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is a structural schematic diagram of the middle-level conductor cross-arm and the lower-level conductor cross-arm;

Fig. 4 is a schematic diagram of the forward and reverse phase sequence conversion wiring in the middle of the utility model;

Fig. 5 is a schematic diagram of wiring for forward and reverse phase sequence conversion of the terminal of the present invention.

detailed description:

Referring to Figures 1-3, the utility model includes a tower body 1, a top ground wire cross arm 2, a middle layer wire cross arm 3, and a lower layer wire cross arm 4. The top of the tower body 1 is provided with a top floor ground wire cross arm 2, and the top layer A middle-level wire cross-arm 3 is arranged under the ground wire cross-arm 2 , and a lower-layer wire cross-arm 4 is arranged under the middle-layer wire cross-arm 3 .

The middle-level conductor cross-arm 4 is T-shaped, and two cross-arms are arranged perpendicular to the direction of the target line from the tower body 1, and one auxiliary cross-arm is arranged from the tower body 1 parallel to the direction of the target line facing the large side, and the lower-level conductor cross-arm 4 It is T-shaped, with two cross-arms arranged perpendicular to the direction of the target line from the tower body 1, and one auxiliary cross-arm arranged from the tower body 1 parallel to the direction of the target line facing the trumpet side.

The direction of the middle-level conductor cross-arm is opposite to that of the auxiliary cross-arm arranged from the tower body parallel to the direction of the target line in the lower-level conductor cross-arm, and the facing direction can be adjusted according to the actual situation.

Among the cross-arms of the middle-level conductor and the cross-arm of the lower-level conductor, the cross-arms on both sides of the tower body are perpendicular to the target line, and the conductors in the same direction as the line are suspended and the conductors in the opposite direction of the line are suspended respectively.

Hard jumper strings with support tubes are hung below the auxiliary cross-arms on one side of the middle-level wire cross-arm 3 and the lower-layer wire cross-arm 4 arranged parallel to the direction of the target line from the tower body 1 .

When the intermediate phase sequence changes and the line has no angle or turns right in the direction of travel:

Referring to Figure 4-5, 1) If the auxiliary crossarm of the lower conductor crossarm of the tower is facing the small side, put the middle phase suspension conductor on the trumpet side through a single circuit positive and negative phase sequence transformation tower middle conductor crossarm above the tower body Connect to the middle phase of the large side, connect the left side wire of the small side to the left cross arm of the middle wire cross arm, and use the auxiliary cross arm with a support tube hard jumper string and jumper string to lead to the middle wire The right cross arm of the cross arm is connected to the right side of the large side; connect the right side wire of the small side to the right cross arm of the lower wire cross arm, and use the auxiliary cross arm with a support tube hard jumper string and jumper wire String, lead to the left cross arm of the lower wire cross arm and connect to the left side of the large side.

2) If the auxiliary cross arm of the lower wire cross arm of the tower faces the large side, connect the middle phase suspension wire on the small side to the tower body above the middle wire cross arm of the tower through a single circuit positive and negative phase sequence transformation. Phase; connect the left wire of the trumpet side to the left cross arm of the lower wire cross arm; connect the right wire of the trumpet side to the right cross arm of the middle wire cross arm.

When the intermediate phase sequence changes and the line has no angle or turns left in the direction of travel:

Referring to Figure 4-5, 1) If the auxiliary crossarm of the lower conductor crossarm of the tower is facing the small side, put the middle phase suspension conductor on the trumpet side through a single circuit positive and negative phase sequence transformation tower middle conductor crossarm above the tower body Connect to the middle phase of the large side; connect the left wire of the small side to the left cross arm of the lower wire cross arm; connect the right wire of the small side to the right cross arm of the middle wire cross arm.

2) If the auxiliary cross arm of the lower wire cross arm of the tower faces the large side, connect the middle phase suspension wire on the small side to the tower body above the middle wire cross arm of the tower through a single circuit positive and negative phase sequence transformation. Phase; connect the left wire of the trumpet side to the left cross arm of the middle wire cross arm; connect the right wire of the trumpet side to the right cross arm of the lower wire cross arm.

The direction and connection mode of the auxiliary crossarm of the utility model can be implemented with reference to the above-mentioned implementation plan, or can be carried out according to the actual situation. When the direction of the line is not angled, the conductors of the same phase sequence only need to be connected to the conductor crossarm of the same layer; When the forward direction of the line is angled, the same phase sequence needs to be connected to the same layer of wire cross-arm, and after the wiring is completed, the auxiliary cross-arm tends to be farther and farther away.

Claims (2)

1. A single-circuit positive and negative phase sequence conversion angle steel tower is characterized in that it includes a tower body, a top floor ground wire cross arm, a middle layer wire cross arm, and a lower floor wire cross arm, and the top of the tower body is provided with a top floor ground wire cross arm There is a middle-level wire cross-arm under the top-layer ground wire cross-arm, and a lower-layer wire cross-arm is arranged under the middle-layer wire cross-arm; The middle conductor cross-arm is T-shaped, two cross-arms are arranged perpendicular to the direction of the target line from the tower body, and one auxiliary cross-arm is arranged from the tower body parallel to the direction of the target line facing the large side; The lower conductor cross-arm is T-shaped, two cross-arms are arranged perpendicular to the direction of the target line from the tower body, and one auxiliary cross-arm is arranged from the tower body parallel to the direction of the target line facing the trumpet side. 2. angle steel tower according to claim 1, it is characterized in that, in described middle-level wire cross-arm, lower layer wire cross-arm, all hang below the auxiliary cross-arm with supporting pipe from one side that tower body parallel target line direction arranges. jumper string.