CN206225793U - A kind of three-phase coenosarc rigid gas insulated power circuit - Google Patents

Abstract

The utility model is related to a kind of three-phase coenosarc rigid gas insulated power circuit, including n straight section unit (2), housing and three piece straight conductors being arranged on enclosure interior of described each the straight section unit (2) including inside filling insulating gas, n >=1, it is provided with m compensating unit (4), compensating unit includes middle casing (42), two flanged (FLGD) bellowss (41), short flow (43), banking stop (44), insulated support and three straight conductors, m >=1.The utility model is simple and reliable for structure, component standard, is applicable various lines design, flexible arrangement.Adjusted according to different installation environments and arranged, ease of assembly construction, compact conformation occupies little space.

Description

A three-phase communal rigid gas insulated transmission line

technical field

The utility model relates to the technical field of high-voltage power transmission, in particular to a three-phase communal rigid gas-insulated power transmission line.

Background technique

Rigid gas insulated transmission line (GIL) is a power transmission device composed of an insulating gas with a certain pressure, a power transmission unit providing a current channel, and other insulating components enclosed in a metal pipe.

As a large-capacity, high-voltage, long-distance transmission line, GIL has the advantages of high reliability, long service life and strong transmission capacity. GIL is a metal rigid closed structure, which is less affected by the external atmosphere and environment, and has no external magnetic field. SF ₆ or SF ₆ and N ₂ mixed gas or compressed air is used as the insulation medium inside, which has good insulation performance, low dielectric loss, no aging problem, no flammability, and high reliability. The average service life of GIL is more than 50 years. At present, the transmission power of GIL can reach 4GW, and the transmission capacity is strong. It is beneficial to reduce the number of transmission circuits. It adopts a compact closed structure and occupies less space than overhead lines. The layout is flexible, which can simplify the system wiring and improve the reliability of the power supply of the whole system.

GIL often encounters a variety of layout situations in engineering design: there are many corners, adding current branches, installing test equipment or introducing other auxiliary detection units requires adding interfaces, one circuit of transmission lines is tapped into two circuits, and three-phase common There are many technical problems such as connecting the body structure with overhead lines, GIS equipment, transformer equipment and cables, and large thermal deformation of long lines. Rigid gas insulated transmission lines (GIL) take up a lot of space in corridor locations where wiring space is small.

The change of the direction of the GIL bus needs to be completed by the corner section. At present, GIL is implemented with castings or two right-angle assemblies for non-90° right-angle turns. The use of casting elbows and two right-angle assemblies cannot absorb the deformation caused by thermal expansion and contraction during the operation of the equipment in the line. It is necessary to add a special thermal compensation device, and the structure is more complicated. Moreover, the thermal compensation device has a large investment, short life and poor reliability, which seriously affects the safe operation of the entire busbar.

Utility model content

In order to solve the above problems, reduce costs, and improve the flexibility of line layout, the utility model proposes a multi-unit combined three-phase solid body rigid gas insulated transmission line. The specific plan is as follows:

A three-phase communal rigid gas-insulated power transmission line, comprising n straight section units, each of which includes a shell filled with insulating gas and three straight conductors arranged inside the shell, n≥1, assuming There are m compensation units, and the compensation unit includes an intermediate shell, two bellows with flanges, a short flow piece, a limit piece, an insulating support and three straight conductors, m≥1, where,

A corrugated tube is fixedly installed at both ends of the intermediate housing respectively, and a short flow piece and a limiter are fixedly installed on the bellows. The straight conductor and the insulating support are installed in the intermediate housing, and the straight conductor is supported by the insulating support. , the short flow piece and the limit piece are fixedly connected to the flanges at both ends of the bellows;

The n straight section units and the m compensation units are connected in pairs by flanges, and the conductors in each unit are plugged in pairs by contact fingers.

Further, the number of short tape-outs is a multiple of 2, and there are at least two.

Further, there are two limiting pieces.

Further, a corner unit is used to change the direction of the transmission line, b branch units are used to divide the transmission line into three branches to connect other equipment, and c T-shaped units are used to add current branches to the transmission line, Add test equipment or introduce other auxiliary units, where a≥0, b≥0, c≥0, the interior of each unit shell is filled with insulating gas, the shells of each unit are connected by flanges, and the conductors in each unit pass through Plug connection. Further, an airtight insulating support is included, and the airtight insulating support is installed on the flanges of two adjacent units or at the opening of the units for installing conductors.

In the utility model, a flexible corner unit is designed, and the required angle of the corner section can be selected according to the angle required by the circuit, so that the design of the GIL circuit is more flexible. At the same time, the corner unit has greater flexibility and can allow angle changes of ±1.5° to absorb thermal expansion and contraction of the circuit and other errors.

The beneficial effects of the utility model are:

1. The utility model has simple and reliable structure, standard components, applicable to various circuit design schemes, and flexible arrangement. Adjust the layout according to different installation environments, which is convenient for assembly and construction, and has a compact structure and takes up little space.

2. The corner unit of the utility model adopts socket welding, which has greater flexibility, and can allow angle changes of ±1.5°. The flexible design of the turning can realize small-angle deformation through the splicing and welding structure of the shell, and absorb errors and errors in the circuit. out of shape.

3. The utility model can reduce the number of flange connections, reduce the number of airtight insulating supports used, reduce the number of sealing surfaces, and remove the thermal compensation device. The probability of leakage is reduced, the reliability of line operation is improved, the project cost is saved, and the construction plan of the project is optimized.

Description of drawings

Fig. 1 is the utility model embodiment 2 schematic diagram;

Fig. 2 is the utility model embodiment 3 schematic diagrams;

Fig. 3 is the utility model embodiment 4 schematic diagram;

Figure 4 is a schematic diagram of the plugging of the static contact and the moving contact;

Fig. 5 is a schematic diagram of a corner unit;

Figure 6 is a schematic diagram of a T-shaped unit;

Fig. 7 is a schematic diagram of a branch unit;

Fig. 8 is a schematic diagram of the compensation unit;

Fig. 9 is a schematic diagram of a straight segment unit;

Fig. 10 is a schematic diagram of Embodiment 1 of the utility model.

detailed description

The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that these specific descriptions are only for those of ordinary skill in the art to understand the present invention more easily and clearly, rather than limiting interpretation of the present invention.

A three-phase communal rigid gas-insulated transmission line, applicable to a voltage level of 66kV to 330kV.

Example 1:

As shown in Fig. 10, a three-phase communal rigid gas insulated power transmission line includes a straight section unit 2 and a compensation unit 4, each straight section unit 2 includes a shell filled with insulating gas and three wires arranged inside the shell straight conductor. The compensation unit includes an intermediate housing 42, two bellows 41 with flanges, a short flow piece 43, a limit piece 44, an insulating support and three straight conductors. The number of straight section units and compensation units is determined according to construction needs. There may be multiple straight section units and compensation units. The number and arrangement sequence of the combination are determined according to the terrain of the transmission line laying or the need to add ports. That is, n (n≥1) straight section units and m (m≥1) compensation units can be set, and in use, n straight section units 2 and m compensation units 4 are connected in pairs by flanges. The compensation unit is used to compensate the thermal expansion change of the straight section of the transmission line to realize line compensation deflection.

As shown in Figure 8, a corrugated tube 41 is fixedly installed at both ends of the middle housing 42 of the compensation unit, and a short flow piece 43 and a limit piece 44 are fixedly installed on the bellows 41, and the straight conductor and the insulating support are installed on the In the intermediate housing, the straight conductor is supported by an insulating support, and the short-running piece 43 and the limiting piece 44 are fixedly connected to the flanges at both ends of the bellows 1 . The number of short run-outs 43 is a multiple of 2, and there are at least two. There are 2 limiting pieces 44. The intermediate housing 2 and the bellows 1 are fixedly connected by flange bolts. The intermediate housing 42 is provided with an insulating support. The insulating support includes a supporting insulator and a basin insulator. The conductor is connected to the supporting insulator or the basin insulator; Form a sliding connection with the intermediate housing.

As shown in Figure 9, the straight section unit 2 is the basic unit of the three-phase communal rigid gas insulated transmission line, including a straight housing 21 and a straight conductor 22 (only two phase conductors can be seen in Figure 9 because of the angle, but it is actually a three-phase conductor). phase conductors) and three-phase support insulators 26. Straight shells are fabricated from formed tube, coil welded tube, spiral welded tube, bent welded tube or friction stir welded tube. The straight conductor is installed inside the straight shell and plugged with the conductor of the adjacent unit. The straight conductor is fixed inside the straight housing through three-phase supporting insulators. The three-phase supporting insulators are fixedly connected or slidingly connected to the straight housing. There are two three-phase supporting insulators inside a straight section unit. The three-phase supporting insulators are connected to the straight housing. Straight conductors are connected by bolts, welding or crimping.

The corrugated tube connects the middle casing and the casing of the adjacent unit, and the conductors are inserted through contacts. The conductors are supported inside the housing by support insulators. When the GIL line has an α angle deviation, α is between 0°-3°, the conductor moves with the housing at the same time, the compensation unit absorbs the deformation, the conductor is plugged with the conductor in the adjacent unit housing through the contact, and through the contact At this time, even if the GIL line expands with heat and contracts with cold, it will not affect the normal use of the line, ensuring the safety of the equipment during operation.

The straight section unit 2 and the compensating unit 4 are connected in pairs by flanges.

The three-phase solid body rigid gas insulated power transmission line of the utility model can also include a branch unit. As shown in Figure 7, the branch unit 1 includes an airtight insulating support 11, a branch housing 12 with a flange and conductors installed in the branch unit (Figure 7 can only see two-phase conductors due to angle reasons, but actually three Phase conductor), the airtight insulating support is installed on the opening of the branch housing, and the airtight insulating support is connected with the conductor. The branch casing includes a main casing and three branch casings 13 communicating with the main casing. The outer end of the branch casing is open and forms a certain angle with the main casing, usually 90°. The branch unit divides it into three branches on the three-phase bus unit to connect other equipment. These three branches can be connected with single-phase busbars, which is convenient for the test, operation and troubleshooting of different branches, and greatly reduces the occupied area, making the installation more flexible and reliable.

The branch conductors in the branch unit include straight conductors and curved conductors; the straight conductors are installed in the main casing, and the curved conductors form a certain angle with the axis, which is the same as the axis angle between the main casing and the branch casing, usually 90°, Bent conductors are mounted in branch housings. The distribution of branch casings can be distributed parallel to the axial direction of the main casing, or can be distributed on the same section in the radial direction of the main casing.

Branching unit, which branches the three-phase communal GIL into a single-phase GIL, which is convenient for connection with overhead lines, GIS equipment, transformers and other equipment. Or divide one round of three-phase common GIL into: one round of three-phase common GIL and one round of single-phase GIL. When there is no such requirement, add a cover plate to seal the opening of the branch shell.

As shown in FIG. 4 , contacts are provided at both ends of the conductors in each unit of the transmission line, and are connected in pairs through the contacts. One end of the conductor is a static contact 33, which is plugged with the moving contact of the adjacent unit conductor through the contact finger 31;

The three-phase solid body rigid gas insulated power transmission line of the utility model may also include a corner unit. Corner units are used to redirect transmission lines. As shown in Figure 5, the corner unit 3 comprises a short section housing 34, a long section housing 35 and a corner conductor 32, and one end opening plane of the short section housing 34 or the long section housing 35 is inclined to the housing axis, and the short section housing The body 34 and the long section housing 35 are adjacent to and fixedly connected to the opening plane inclined to the housing axis, so that the housing axes of the long section housing and the short section housing have an included angle; the short section housing 34 and the long section The housing 35 is equal in diameter and formed by insert welding: the short-section housing 34 and the long-section housing 35 are inserted and welded to form a certain angle. The butt joint between the short-section shell 34 and the long-section shell 35 is rounded to reduce the local electric field intensity.

Each corner conductor 32 is a conductor with an axis with a bending angle, which is installed in the short section housing 34 and the long section housing 35, and the axis bending angle of the corner conductor is the same as that of the long section housing and the short section housing. The included angles of the axes are the same; wherein, the long section housing 35 is provided with a fixed insulating support 36 and a sliding insulating support 37, wherein the fixed insulating support 36 is close to the corner, and the two ends of the corner unit 3 are provided with flanges , connected with adjacent units; the corner conductor 32 is installed in the short-section housing 34 and the long-section housing 35 through a fixed insulating support 36 and a sliding insulating support 37 . One end of each corner conductor 32 is also equipped with a static contact 33, and a movable contact 33' is installed at its other end, and the static contact and the movable contact of adjacent units are inserted through the contact fingers 31.

The three-phase solid body rigid gas insulated power transmission line of the utility model can also include T-shaped units. T-type units are used to add current branches to transmission lines, install test equipment or introduce other auxiliary units. As shown in FIG. 6 , the T-shaped unit 5 includes a T-shaped housing 52 and conductors. The T-shaped housing includes an upper port 53 , a left port 54 and a right port 55 , the airtight insulating supports are installed on the ports, and the conductors are installed on the airtight insulating supports.

The airtight insulation support is installed on the flanges of two adjacent units or at the opening of the units, which is used to install the conductor and ensure the airtightness of the transmission line.

Each unit selects different units according to the circuit layout, and any number of combinations. That is to say, the three-phase communal rigid gas insulated transmission line of the present invention, in addition to the above-mentioned straight unit and compensation unit, may also include a corner unit 3, which is used to change the direction of the transmission line, and b branches Unit 1, which is used to divide the transmission line into three branches to connect other equipment, and c T-shaped units 5, which are used to add current branches to the transmission line, install test equipment or introduce other auxiliary units, wherein a ≥0, b≥0, c≥0, each unit shell is filled with insulating gas, the shells of each unit are connected by flanges, and the conductors in each unit are connected by plugs.

Example 2:

As shown in FIG. 1 , a three-phase communal rigid gas-insulated transmission line includes a straight section unit 2 , a branch unit 1 , a corner unit 3 , a compensation unit 4 and a T-shaped unit 5 . The right port 55 of the T-shaped unit 5 is connected to one end of the compensation unit 4, the other end of the compensation unit 4 is connected to the short section housing 34 of the corner unit 3, the long section housing 35 is connected to one end of the straight section unit 2, and the straight section unit The other end of 2 is connected with branch unit 3. The interior of each unit shell is filled with insulating gas, the shells of each unit are connected by flanges, and the conductors in each unit are connected by plugging.

Example 3:

As shown in FIG. 2 , a three-phase communal rigid gas-insulated transmission line includes two straight section units 2 , a corner unit 3 , a branch unit 1 , a compensation unit 4 and a T-shaped unit 5 . One end of the compensation unit 4 is connected to the left port 54, and the other end is connected to the short section housing 34 of the corner unit 3. The deflection angle of the corner unit is 120°, and of course it can be set to other angles as required. The long-section housing 35 of the corner unit 3 is connected to two straight-section units 2 in turn, and then connected to the branch unit 1 . Each unit is filled with insulating gas.

Example 4:

As shown in FIG. 3 , a three-phase communal rigid gas insulated transmission line includes four straight section units 2 , corner units 3 , compensation units 4 and T-shaped units 5 . The deflection angle of the corner unit 3 is 90°. Two straight section units 2 are connected sequentially and then connected to the upper port 53 of the T-shaped unit 5, one end of the compensation unit is connected to the left port 54 of the T-shaped unit, the other end is connected to the short section housing 34 of the corner unit 3, and the long section of the corner unit The housing 35 is connected with two successively connected straight sections. Each unit is filled with insulating gas, and the deflection angle of the corner unit is 90°.

The three-phase communal rigid gas-insulated transmission line of the utility model has simple and reliable structure, standard components, is applicable to various line design schemes, and has flexible layout. Adjust the layout according to different installation environments, which is convenient for assembly and construction, and has a compact structure and takes up little space.

Claims (5)

1. a kind of three-phase coenosarc rigid gas insulated power circuit, including n straight section unit (2), described each straight section unit (2) Housing and three straight conductors for being arranged on enclosure interior, n >=1, it is characterised in that be provided with m including inside filling insulating gas Individual compensating unit (4), compensating unit includes middle casing (42), two flanged (FLGD) bellowss (41), short flow (43), spacing Piece (44), insulated support and three straight conductors, m >=1, wherein,

Middle casing (42) two ends fixedly mount a bellows (41) respectively, are installed with the bellows (41) Short flow (43) and banking stop (44), the straight conductor and the insulated support are arranged in the middle casing, described straight Conductor is supported by the insulated support, the short flow (43) and the banking stop (44) and the bellows (41) two ends Flange is fixedly connected；

The n straight section unit (2) is connected two-by-two with the m compensating unit (4) by flange, and the conductor in each unit passes through Fingertip grafting two-by-two.

2. three-phase coenosarc rigid gas insulated power circuit according to claim 1, it is characterised in that the short flow (43) quantity is 2 multiple, and at least two.

3. three-phase coenosarc rigid gas insulated power circuit according to claim 1, it is characterised in that the banking stop (44) there are 2.

4. three-phase coenosarc rigid gas insulated power circuit according to claim 1, it is characterised in that also turn including a For making transmission line of electricity change direction, b branch units (1) connects angle unit (3) for making transmission line of electricity separate three branch roads Other equipment, and c T-shaped unit (5) in transmission line of electricity for adding current branch, installing testing equipment additional or introducing it His auxiliary unit, wherein a >=0, b >=0, c >=0, each unit enclosure interior filling insulating gas passes through between the housing of each unit Flange is connected, and the conductor in each unit passes through socket connection.

5. the three-phase coenosarc rigid gas insulated power circuit according to any one of claim 1-4, it is characterised in that bag Airtight insulating supporting (11) is included, the airtight insulating supporting is arranged on the flange of two neighboring unit or at the opening of unit, For installing conductor.