Non-right-angle composite corner expansion joint device for 550kV GIL

Abstract

The utility model relates to the technical field of ultrahigh pressure equipment. The utility model relates to an expansion joint device, in particular to a non-right-angle composite corner expansion joint device for a 550kV GIL. Comprising a fixed supporting point, a guide sliding supporting point, an independent corner expansion joint, a corner generatrix and a straight generatrix, the three independent corner expansion joints are connected through the corner buses and the straight buses, and the fixed supporting points are arranged on the outer sides of the independent corner expansion joints at the two ends. The non-right-angle composite corner expansion joint device for the 550kV GIL can efficiently solve the compensation problem of a non-right-angle corner bus in a high-temperature-difference working condition in a narrow space such as a pipe gallery, can effectively avoid the potential safety hazard of abnormal stress when the non-right-angle corner bus changes due to temperature influence, and improves the safety and reliability of the bus in a power supply system.

Description

Technical Field

[0001] The utility model relates to the technical field of extra-high voltage equipment. In particular, it is a non-rectangular composite corner expansion joint device for 550 kV GIL. Background Art

[0002] At present, the number of 550 kV gas-insulated metal-enclosed busbar equipment in power grid operation is increasing year by year, and most of them are arranged in underground pipe galleries. The equipment operation faces special working conditions such as narrow space and non-90° corners. Therefore, a stable and highly safe expansion joint compensation device is essential for the power supply system.

[0003] In pipe gallery projects, the space in most project pipe galleries is limited, and there are various angular arrangement forms. Therefore, it is difficult to solve the problem of non-conventional angle compensation. If no compensation is carried out at the corner structure and the compensation function is realized by means of free compensation, the fixed support points can be set close to the corner busbar. The length of the cylinder changes less due to thermal expansion and contraction, and the stiffness of the cylinder at the corner can be utilized to achieve free compensation. However, when the change amount of the cylinder exceeds a certain amount, there will be a situation where the corner cylinder is abnormally stressed. If a right-angle corner structure is used and a hinge expansion joint (a structure composed of two independent corner expansion joints) is used for compensation, when the cylinder changes greatly due to thermal expansion and contraction, the compensation amount of the hinge expansion joint is large, resulting in radial displacement of the non-hinge side busbar. In this compensation method, the non-hinge side cylinder will be abnormally stressed, and in severe cases, the cylinder can be torn, causing gas leakage and then resulting in faults such as power outages. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem of abnormal stress during the temperature compensation process of the non-rectangular pipeline busbar structure in the limited space of the pipe gallery, so as to make the power grid operation safer and more reliable.

[0005] To achieve the above purpose, the technical method of the present utility model is as follows: A non-rectangular composite corner expansion joint device for 550 kV GIL includes fixed support points, guiding sliding support points, independent corner expansion joints, corner busbars, and straight busbars; the three independent corner expansion joints are connected by corner busbars and straight busbars, and the fixed support points are arranged outside the independent corner expansion joints at both ends, so that the stress generated by temperature compensation outside this area does not affect the structure between the two fixed support points.

[0006] For the above-mentioned non-rectangular composite corner expansion joint device for 550 kV GIL, the structure of the independent corner expansion joint is as follows: Two flanges are connected by a corrugated pipe, and 2 pairs of hinge plates are provided. Each pair of hinge plates is connected by a shaft, and both ends of each pair of hinge plates are respectively connected to the flanges. The 2 pairs of hinge plates are arranged along the 0° and 180° directions of the flange. For the independent corner expansion joint, high-strength rotatable hinge plates need to be used for fixation to offset the blind flange force generated by the expansion joint.

[0007] For the above non - right - angle composite corner expansion joint device for 550 kV GIL, several horizontal guiding sliding support points are provided beside the fixed support points. It is necessary to ensure that the straight busbar in the horizontal section does not deflect radially during the temperature compensation process.

[0008] For the above non - right - angle composite corner expansion joint device for 550 kV GIL, the corner busbar is a non - right - angle corner busbar with an angle of 90° - 180°.

[0009] Advantages of the present utility model: The non - right - angle composite corner expansion joint device for 550 kV GIL can efficiently solve the compensation problem of non - right - angle corner busbars in narrow spaces such as pipe galleries under high temperature difference conditions, effectively avoid potential safety hazards of abnormal stress when the non - right - angle corner busbars change under the influence of temperature, and improve the safety and reliability of the busbars in the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic structural diagram of the present utility model.

[0011] Figure 2 is Figure 1 a schematic structural diagram of the independent corner expansion joint in

[0012] In the figure, the marks are: 1 - fixed support point, 2 - guiding sliding support point, 3 - independent corner expansion joint, 4 - corner busbar, 5 - straight busbar, 6 - hinge plate, 7 - shaft, 8 - bellows, 9 - flange. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] The present utility model will be further described in conjunction with the accompanying drawings of the specification.

[0014] Embodiment 1

[0015] As Figure 1 shown, a non - right - angle composite corner expansion joint device for 550 kV GIL has a structure: straight busbars 5, independent corner expansion joints 3, straight busbars 5, flanges, corner busbars 4, independent corner expansion joints 3, straight busbars 5, independent corner expansion joints 3, and straight busbars 5 connected in sequence. The corner busbar 4 can be a corner busbar 4 with any angle of 90° - 180° according to the situation. Fixed support points 1 are provided at the straight busbars 5 at both ends of the overall non - right - angle composite corner expansion joint device for 550 kV GIL, and the fixed support points 1 are used to block the influence of the length change amount of the remaining part of the busbar on this structure. Horizontal guiding sliding support points 2 are provided beside the fixed support points 1. The horizontal guiding sliding support points 2 ensure that this device does not deflect radially along the busbar during the temperature compensation process.

[0016] As Figure 2As shown in the figure, the structure of the independent corner expansion joint 3 is as follows: Two flanges 9 are connected by a corrugated pipe 8. There are 2 pairs of hinge plates 6. Each pair of hinge plates 6 is connected by a shaft 7. The two ends of each pair of hinge plates 6 are respectively connected to the flange 9. The 2 pairs of hinge plates 6 are arranged along the 90° and 180° directions of the flange 9. The use of the shaft 7 to fix between each pair of hinge plates 6 enables the non-right-angle composite corner expansion joint device for 550 kV GIL to achieve angular compensation, and the hinge plates 6 can offset the blind flange force generated by the expansion joint.

[0017] The change amount caused by temperature, etc. of the straight busbar 5 needs to be absorbed by the non-right-angle composite corner expansion joint device for 550 kV GIL. The corrugated pipe of the independent corner expansion joint 3 bends, and the hinge plates 6 at the relative positions bend around the shaft 7 to achieve the effect of angular compensation.

[0018] In this embodiment, calculate the compensable range S of the non-right-angle composite corner expansion joint device (the length L of the two independent corner expansion joints in the ramp section / the tangent value tanθ of the compensable angle of the independent corner expansion joint). S is the length from the fixed support point 1 of the long straight horizontal busbar to the corner busbar 4.

[0019] Several guiding sliding support points need to be set within the range of the long straight busbar S.

[0020] An independent corner expansion joint is set near the corner busbar 4.

[0021] The independent corner expansion joint 3 and the corner busbar 4 are connected by a short straight busbar 5.

[0022] In the ramp section 1, the corner busbar 4 is directly connected to the independent corner expansion joint 3.

[0023] In the ramp section 2, the two independent corner expansion joints 3 are connected by a straight busbar 5. The independent corner expansion joint 3 needs to be fixed in the 0° and 180° directions using high-strength rotatable hinge plates to offset the blind flange force generated by the expansion joint.

[0024] At the lower part of the ramp, fixed support points need to be used for fixation.

Claims

1. A non-right-angle composite corner expansion joint device for 550kV GIL, characterized in that: It comprises a fixed support point (1), a guide sliding support point (2), an independent corner expansion joint (3), a corner busbar (4), and a straight busbar (5); the three independent corner expansion joints (3) are connected via the corner busbar (4) and the straight busbar (5), and the fixed support point (1) is arranged on the outside of the independent corner expansion joints (3) at both ends.

2. A non-right-angle composite corner expansion joint device for a 550kV GIL according to claim 1, characterized in that: The structure of the independent corner expansion joint (3) is as follows: two flanges (9) are connected by a bellows (8), and two pairs of hinge plates (6) are provided. Each pair of hinge plates (6) is connected by a shaft (7), and both ends of each pair of hinge plates (6) are respectively connected to the flange (9), and the two pairs of hinge plates (6) are arranged along the 0° and 180° directions of the flange (9).

3. A non-right-angle composite corner expansion joint device for a 550kV GIL according to claim 1, characterized in that: A horizontal guide sliding support point (2) is arranged next to the fixed support point (1).

4. A 550kV GIL non-right angle composite angle expansion joint device according to claim 1, characterized in that: The corner generatrix (4) is a non-right-angle corner generatrix (4) with an angle of 90°-180°.

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