CN204258233U - The power transmission line spacer of the anti-subspan oscillation of a kind of quadripartion formula - Google Patents

Abstract

The utility model discloses a four-split transmission line spacer for preventing sub-gap oscillation, which comprises a quadrangular frame and a wire clip. On the four corners of the rectangular frame, the four corners of the quadrilateral frame are respectively connected to the front end of the wire clip, the rear end of the wire clip is provided with a clip hole, and the inner wall of the clip hole is provided with a rubber pad; The centerline of the clip is located on the extension of the diagonal corresponding to this diagonal. The utility model alternately arranges long wire clips and short wire clips at the four corners of the quadrilateral frame, and increases the distance between the split wires respectively fixed in the long wire clips and short wire clip holes through the long wire clips and short wire clips of different lengths, so as to reduce the The impact of sub-gap oscillation on the operation safety of high-voltage transmission lines ensures the safe and stable operation of the power system.

Description

A four-split transmission line spacer for preventing sub-span oscillation

technical field

The utility model relates to a transmission line spacer in the field of vibration prevention and disaster reduction for high-voltage transmission lines, in particular to a four-split transmission line spacer for preventing sub-gap oscillation.

Background technique

The vibration hazard of transmission lines under the action of wind load is serious, which greatly threatens the safe operation of high-voltage transmission lines. Sub-span oscillation is a unique form of vibration of the split conductor line under the action of wind load, and it is a vibration of the split conductor caused by the galloping wake of the conductor. Sub-gap oscillation will cause the sub-conductors to collide and whip each other, causing the conductors to wear out. In severe cases, it may cause accidents such as broken strands and short circuits, seriously endangering the safe and stable operation of the power system.

At present, the main methods to prevent sub-gauge oscillation of split conductors include: improving the arrangement of sub-gap, increasing the ratio of sub-conductor spacing to conductor diameter, installing anti-vibration fittings, etc. The improvement of the sub-gap arrangement is mainly realized by the unequal sub-gap arrangement of the split conductors. This method avoids the situation that the natural frequency of the wires in adjacent sub-spans is the same, and improves the sub-span oscillation of the split wires to a certain extent. Increasing the split pitch to wire diameter ratio is primarily achieved by increasing the split pitch of the sub-wires. This method can reduce the number of sub-conductors in the wake, thereby reducing the sub-gap oscillation, but increasing the spacing of sub-conductors will increase the input cost. The installation of anti-vibration fittings is mainly achieved by fixing the spacing of the sub-wires of the anti-vibration fittings and changing the shape of the wires. This method can effectively improve the galloping characteristics of the transmission line, but the effect of preventing and controlling the sub-gap oscillation is not obvious.

Utility model content

The purpose of this utility model is to provide a four-split transmission line spacer for preventing sub-gap oscillation, which can effectively avoid the disadvantages of existing anti-vibration methods in preventing and controlling sub-gap oscillation, and reduce the impact of sub-gap oscillation on high voltage The impact on the operation safety of graded transmission lines ensures the safe and stable operation of the power system.

The utility model adopts the following technical solutions:

A four-split transmission line spacer for preventing sub-gap oscillations, including a quadrangular frame and wire clips, the wire clips include two long wire clips and two short wire clips, and the long wire clips and short wire clips are alternately arranged on four sides of the quadrangular frame. On the top corners, the four top corners of the quadrilateral frame are respectively connected to the front end of the wire clamp, the rear end of the wire clamp is provided with a clamp hole, and the inner wall of the clamp hole is provided with a rubber pad; the center line of the two wire clamps set on the opposite corners of the quadrilateral frame Located on the extension of the diagonal corresponding to this diagonal.

The included angle formed by the line between the centers of the clamping holes of the adjacent long line clips and short line clips and the side line of the rectangular frame connected to the long line clips and short line clips is greater than 0°.

The lengths of the two long line clips are the same, and the lengths of the two short line clips are the same.

The quadrilateral frame is a quadrilateral frame of double-frame boards.

The quadrilateral frame adopts a rectangular frame.

The rectangular frame is a square frame.

The surfaces of the chucks of the long wire clamp and the short wire clamp are arc-shaped.

Both the quadrilateral frame and the wire clamp are made of aluminum alloy.

The rubber pad is a silicon rubber pad.

The utility model alternately arranges long wire clips and short wire clips at the four corners of the quadrilateral frame, and increases the distance between the split wires respectively fixed in the long wire clips and short wire clip holes through the long wire clips and short wire clips of different lengths, so as to reduce the The impact of small sub-gap oscillation on the operation safety of high-voltage transmission lines ensures the safe and stable operation of the power system. Further, the utility model changes the angle formed by the center connection line of the clamp hole of the adjacent long line clip and the short line clip and the side line of the rectangular frame connected by the long line clip and the short line clip. When the angle is larger, the adjacent The farther the distance between the wires clamped by the long line clamp and the short line clamp is, the less the wake effect of the sub-conductor on the leeward side is by the sub-conductor on the windward side, and the less likely it is for sub-gap oscillation to further protect the power system. Safe and stable operation.

Description of drawings

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

Fig. 2 is the topology simplified diagram of the present utility model;

Fig. 3 is a bottom view of Fig. 1 .

Detailed ways

As shown in Fig. 1 and Fig. 2, the transmission line spacer of the four-split anti-secondary pitch oscillation described in the utility model includes a quadrilateral frame 1 and a wire clip, and the wire clip includes two long wire clips 2 and two short wire clips 3. The long wire clamp 2 and the short wire clamp 3 are alternately arranged on the four corners of the quadrilateral frame 1, and the four corners of the quadrilateral frame 1 are respectively connected to the front end of the wire clamp, and the rear end of the wire clamp is provided with clamping holes. The inner wall is provided with a rubber pad 4; the center line of the two clamps provided on the opposite corners of the quadrilateral frame 1 is located on the extension line of the corresponding diagonal. The utility model utilizes the alternately arranged long wire clamps 2 and short wire clamps 3 to increase the spacing of the split wires respectively fixed in the long wire clamps 2 and the short wire clamps 3 clamping holes.

In the present utility model, the included angle α formed by the center line 5 of the clamp hole of the adjacent long line clamp 2 and the short line clamp 3 and the side line 6 of the rectangular frame connected to the long line clamp 2 and the short line clamp 3 is greater than 0°. By setting the size of the angle α, the relative position of the wires clamped by the adjacent long wire clamps 2 and short wire clamps 3 can be changed, and the larger the angle α, the wires clamped by the adjacent long wire clamps 2 and short wire clamps 3 The farther the distance is, correspondingly, the sub-conductor on the leeward side is less affected by the wake effect of the sub-conductor on the windward side, and the sub-gap oscillation is less likely to occur.

In this embodiment, the quadrangular frame 1 is made of aluminum alloy. The quadrilateral frame 1 can adopt a rectangular frame or a square frame. As shown in Figure 3, the quadrilateral frame 1 is a double-frame plate structure, which is formed by fixing the upper and lower two-layer plate frames with bolts. This structure can reasonably reduce the weight of the spacer bar under the premise of ensuring its mechanical properties. The quadrilateral frame 1 is inside the split wire, and this structure can reduce the corona loss of the spacer frame.

In this embodiment, both the long wire clip 2 and the short wire clip 3 are made of aluminum alloy. The lengths of the two long clamps 2 are the same, and the lengths of the two short clamps 3 are the same. This structure can form a symmetrically distributed electric field inside the split wire. The surfaces of the chucks of the long wire clamp 2 and the short wire clamp 3 are all treated with large arcs, so that the chuck surfaces of the long wire clamp 2 and the short wire clamp 3 are arc-shaped. This structure can reduce the potential gradient of the wire clamp head, thereby reducing Chances of corona at the head of the clamp.

In this embodiment, the rubber pad 4 is a silicon rubber pad. The compression deformation produced by the rubber pad 4 can generate a positive pressure on the wire clamped by the wire clamp, compensate the creep of the wire, and can also absorb the vibration energy of the wire, thereby achieving the effect of suppressing the vibration of the wire.

On the one hand, the utility model increases the spacing of the split wires fixed inside the clamping holes of the long line clamp 2 and the short line clamp 3 through alternately arranged long line clamps 2 and short line clamps 3; on the other hand, by changing the size of the included angle α, it can avoid The leeward sub-conductor is directly in the wake of the windward sub-conductor. Through the joint action of the above two aspects, the utility model can reduce the wake effect of the sub-conductor on the windward side to the sub-conductor on the leeward side, reduce the influence of sub-gap oscillation on the operation safety of high-voltage transmission lines, and ensure the safe and stable operation of the power system.

Claims (9)

1. the power transmission line spacer of the anti-subspan oscillation of quadripartion formula, it is characterized in that: comprise quadrilateral frame and wire clamp, wire clamp comprises two long wire clamps and two short-term folders, long wire clamp and short-term folder are disposed alternately on four drift angles of quadrilateral frame successively, the front end of four drift angles difference connecting clamps of quadrilateral frame, the rear end of wire clamp is provided with folder hole, and folder hole inwall is provided with rubber blanket; The center line of two wire clamps that quadrilateral frame diagonal angle is arranged is positioned on the cornerwise extended line corresponding to this diagonal angle.

2. the power transmission line spacer of the anti-subspan oscillation of quadripartion formula according to claim 1, is characterized in that: the folder hole line of centres that adjacent long wire clamp and short-term press from both sides therewith long wire clamp and short-term press from both sides the rectangular frame be connected sideline formed by angle be greater than 0 °.

3. the power transmission line spacer of the anti-subspan oscillation of quadripartion formula according to claim 2, is characterized in that: the length of two described long wire clamps is identical, and the length of two short-term folders is identical.

4. the power transmission line spacer of the anti-subspan oscillation of quadripartion formula according to claim 3, is characterized in that: described quadrilateral frame is two deckle board quadrilateral frame.

5. the power transmission line spacer of the anti-subspan oscillation of quadripartion formula according to claim 4, is characterized in that: described quadrilateral frame adopts rectangular frame.

6. the power transmission line spacer of the anti-subspan oscillation of quadripartion formula according to claim 5, is characterized in that: described rectangular frame is square frame.

7. the power transmission line spacer of the anti-subspan oscillation of quadripartion formula according to claim 6, is characterized in that: the jaw face of described long wire clamp and short-term folder is circular arc.

8. the power transmission line spacer of the anti-subspan oscillation of quadripartion formula according to claim 7, is characterized in that: described quadrilateral frame and wire clamp are aluminum alloy materials.

9. the power transmission line spacer of the anti-subspan oscillation of quadripartion formula according to claim 8, is characterized in that: described rubber blanket is silicone rubber pad.