Structure for preventing high-current conductor from crossing roof to generate circulating current

Abstract

The utility model relates to the technical field of power distribution networks, and discloses a structure for preventing a large-current conductor from passing through a roof to generate circulating current, which comprises an installation structure, the installation structure comprises a connecting piece and at least three installation pipes passing through the roof, the connecting piece is made of non-magnetic materials, steel bars are provided with gaps, and the connecting piece is fixed on the steel bars and communicated with the gaps. The mounting pipe is fixed to the supporting framework, and the concrete is filled on the periphery of the mounting pipe and wraps the connecting pieces, the steel bars and the mounting pipe. Non-magnetic connecting pieces are adopted to replace steel bars to be connected between the mounting pipes, electromagnetic fields around the cables are effectively isolated, the three-phase cables are prevented from forming closed loops respectively, the three-phase cables are made to be located in the same closed loop, and therefore current circulation is restrained, electromagnetic induction is reduced, and the heat effect between a split-phase bus and the steel bars is reduced; and therefore, the waterproof performance and the structural strength of the roof are prevented from being influenced by cracks of the roof caused by bursting of the concrete due to heating.

Description

Technical Field

[0001] The utility model relates to the technical field of power distribution network, in particular to a structure for preventing a large current conductor from passing through a roof to generate a circulating current. Background Art

[0002] Gas Insulated Metal Enclosed Switchgear (GIS) is a type of substation. In a gas insulated substation, most of the electrical equipment is directly or indirectly sealed in a pipe tree composed of metal pipes and bushings, and no switches, lines, or terminals can be seen from the outside. The interior of the pipe tree uses SF6 gas as the insulating medium, and all high-voltage electrical components are sealed in a grounded metal cylinder. It is a high-voltage power distribution device composed of seven types of high-voltage electrical appliances: circuit breakers, busbars, disconnectors, voltage transformers, current transformers, lightning arresters, and bushings.

[0003] The distribution network is located at the end of the power system. It will gradually reduce the voltage of a large amount of electric energy transmitted through the transmission network through the transformer, and then "distribute" it to users through the distribution network. The current directly diverted by the transformer is generally three-phase electricity. When the voltage is greater than 110KV, because when the voltage is too large, the net distance between phases increases, and the insulation requirements increase, it is generally a split-phase structure. The split-phase busbar is divided into phase A, phase B and phase C, that is, the three phases are respectively set in independent metal closed shells. The split-phase busbar passes through the building and is connected to the main distribution box in the building. The main distribution box then "distributes" the electricity to the electrical appliances, thereby driving the electrical appliances through electricity. However, since the interior of the building is generally composed of a steel mesh through a combination of horizontal and vertical steel bars, the steel mesh is used as a supporting skeleton, and concrete is poured outside the supporting skeleton to form the roof of the building, when the independent split-phase busbar passes through the roof, the steel bars form a closed loop around the split-phase busbar. When the split-phase busbar is energized, the closed loop forms electromagnetic induction with the steel bars, causing the steel bars to heat up, causing the buildings around the closed loop to be locally heated, causing damage to the building structure.

[0004] During the implementation of the project, when the phase-separated GIS busbar passes through the roof, the large current in the conductor causes a large circulation current to be generated in the roof steel bars around the hole, causing the steel bars to heat up. Long-term operation will cause a large amount of power loss and cause cracks in the roof structure, affecting the roof waterproofing. Utility Model Content

[0005] The utility model aims to provide a structure for preventing a large current conductor from passing through a roof to generate a circulating current, so as to avoid electromagnetic induction heating of steel bars when three-phase electricity passes through a building.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a structure to prevent high-current conductors from passing through the roof to generate circulating currents, including a mounting structure, the mounting structure including a connector and at least three mounting tubes that penetrate the roof, the connector is made of non-magnetic material, a discontinuity is provided on the steel bar, the connector is fixed on the steel bar and connects the discontinuity, the mounting tube is fixed on the supporting frame, concrete is filled around the mounting tube and wraps the connector, the steel bar and the mounting tube.

[0007] The beneficial effects of this solution are as follows: three split-phase cables of three-phase electricity are passed through the roof through the through holes formed by three installation tubes, which can reduce damage to the roof structure. At the same time, since the steel bars between the installation tubes are replaced by non-electromagnetic connectors, the three split-phase cables are ensured to be in the same conductor loop. Non-magnetic connectors are used to replace the steel bars to connect between the installation tubes, which effectively isolates the electromagnetic field around the cables and prevents the three-phase cables from forming closed loops respectively, so that the three-phase cables are in the same closed loop, thereby suppressing current circulation, reducing electromagnetic induction, and reducing the thermal effect between the split-phase busbar and the steel bars, thereby avoiding the concrete from bursting due to heat, causing cracks in the roof, and affecting the waterproof performance and structural strength of the roof.

[0008] Furthermore, the support frame includes at least two layers of steel meshes, the mounting structure also includes a mounting portion, the through-wall piece includes a mounting portion, the mounting pipe is fixedly arranged on the mounting portion to form a through-wall piece, and the through-wall piece is fixed between the steel meshes.

[0009] Beneficial effect: Improve the structural strength of the roof

[0010] Furthermore, the connecting piece is made of glass fiber.

[0011] Beneficial effects: Material strength is close to or even exceeds that of steel bars, non-magnetic material

[0012] Furthermore, three-phase power split-phase cables are inserted into the installation tubes respectively, and the split-phase cables include a conductor and a shell, an inert gas is arranged between the conductor and the shell, and the outer diameter of the shell is smaller than the aperture of the installation tube.

[0013] Beneficial effect: the outer diameter of the shell is smaller than the aperture of the installation pipe, that is, the diameter of the installation pipe is larger than the diameter of the phase-splitting cable, which facilitates the phase-splitting cable to pass through the installation pipe into the house.

[0014] Furthermore, reinforcement units are fixedly installed on both sides of the installation structure, and the reinforcement units include steel plates. The steel plates are arranged on both sides of the wall-penetrating parts and fixedly connected to the concrete. The steel plates are provided with strip grooves for accommodating three-phase power cables. The installation pipe is located in the strip grooves, and the strip grooves are provided with copper or aluminum edging.

[0015] Beneficial effects: 1. By setting up reinforcement units, the structural strength of the installation structure is further strengthened, reducing the damage to the building structure caused by the installation structure; 2. The steel plate is fixedly connected to the concrete, which can further strengthen the structural strength of the roof around the installation structure; 3. Steel plates are set on both sides of the wall penetration to avoid wear on the roof concrete during the cable passing through the roof; 4. The strip groove is set with copper or aluminum edging to reduce the friction between the cable and the installation structure, reducing the wear of the cable when passing through the roof.

[0016] Furthermore, it also includes a grounding wire. The supporting frame includes a first steel mesh and a second steel mesh. A flow guide is arranged between the first steel mesh and the second steel mesh. The flow guide is connected to the grounding wire.

[0017] Beneficial effects: When a three-phase power failure occurs, the magnetic field generated between the phase cables cannot be completely offset, causing the steel mesh to generate an induced current. The guide and grounding wire can conduct the generated current into the earth, reducing the heat generated by electromagnetic induction and reducing damage to the building.

[0018] Furthermore, the connection method between the connecting piece and the steel bar is wire tying.

[0019] Beneficial effect: The connector is connected to the steel bar by tying wire to make up for the discontinuity of the steel bar support frame and reduce the influence of the discontinuity on the strength of the support frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the roof structure;

[0021] Figure 2 This is a schematic diagram of steel bar discontinuity in the roof support skeleton;

[0022] Figure 3 This is a schematic diagram of the installation structure of the utility model;

[0023] Figure 4 It is a schematic diagram of the installation pipe, reinforcement unit and roof assembly of the utility model;

[0024] Figure 5 This is a schematic diagram of the assembly of the wall penetration piece and the reinforcement unit of the utility model. DETAILED DESCRIPTION

[0025] The following is further described in detail through specific implementation methods:

[0026] The reference numerals in the drawings of the specification include: concrete 1 , support frame 2 , steel bars 21 , connectors 23 , tie wires 22 , wall penetrations 3 , mounting pipes 31 , mounting portions 32 , steel plates 4 , and blocking members 41 .

[0027] Example 1

[0028] Embodiment 1 is basically as attached Figure 1-3 As shown, Figure 1-3 A structure for preventing a large current conductor from passing through a roof to generate a circulating current is shown, including a mounting structure such as Figure 1 As shown, the roof includes concrete 1, the concrete 1 is wrapped with a support frame 2 composed of steel bars, the support frame 2 is connected to a grounding wire, the support frame 2 includes a first steel mesh and a second steel mesh, a copper guide is arranged between the first steel mesh and the second steel mesh, and the grounding wire is connected to the first steel mesh and the second steel mesh through the guide, so as to conduct the current generated on the first steel mesh and the second steel mesh into the earth.

[0029] The installation structure includes a connecting member 23, a tie wire 22 and three wall penetration members 3, such as Figure 2 As shown, taking the first steel mesh as an example, the first steel mesh is composed of a plurality of transverse steel bars 21 and longitudinal steel bars 21 interlaced to form a mesh structure, the transverse steel bars 21 and the longitudinal steel bars 21 are cut short to form discontinuities, and the connectors 23 are fixed to the steel bars by the tying wires 22 to connect the discontinuities on the steel bars, as shown in FIG. Figure 5 As shown, the wall penetration member 3 is provided with a mounting portion 32 and a mounting tube 31, the aperture of the mounting tube 31 is larger than the diameter of the phase-separated cable, the mounting portion 32 is provided with a slot, and the connecting member 23 is glass fiber, such as Figure 3 As shown, the glass fiber bypasses the slot and cross-stretches the shortened transverse steel bars 21 and the longitudinal steel bars 21 to form a cross-stretched mesh structure again. At the same time, the wall-penetrating member 3 is fixed between the first steel mesh and the second steel mesh, so that the wall-penetrating member 3 is fixed in the supporting frame 2 to avoid the hollowing of the roof concrete due to the shaking of the wall-penetrating member 3, thereby reducing the structural strength of the roof.

[0030] The specific implementation process is as follows:

[0031] After the roof support frame 2 is arranged, before pouring the concrete 1, at the preset installation position of the installation structure, the transverse steel bars 21 and the longitudinal steel bars 21 are cut short to form a discontinuity, and the connecting piece 23 is fixed to the steel bar by the wire 22 to connect the discontinuity on the steel bar. The through-wall piece 3 is provided with a mounting portion 32 and a mounting pipe 31, and the mounting portion 32 is provided with a slot. The connecting piece 23 is glass fiber, and the glass fiber bypasses the slot and straightens the transverse steel bar 21 and the longitudinal steel bar 21 respectively, so that the strength of the original support frame 2 is retained, and the influence of the installation structure on the structural strength of the roof is reduced. After the through-wall piece 3 is installed, the concrete 1 is filled around the mounting pipe 31 and the connecting piece 23, the steel bar and the through-wall piece 3 are wrapped. After the concrete 1 solidifies, as shown in Figure 4 As shown, the blocking member 41 is removed and the cable can be passed through the roof.

[0032] Example 2

[0033] Based on the embodiment 1, it also includes a reinforcement unit, such as Figure 5 As shown, the reinforcement unit includes a steel plate 4 and a sealing member 41. A strip groove is opened on the steel plate 4, and the strip groove is provided with a copper or aluminum edging. A connecting column is welded on the opposite side of the steel plate 4, and an internal thread penetrating the steel plate 4 is provided in the connecting column. The sealing member 41 is provided with a handle and three protruding columns, and the protruding columns are adapted to the mounting tube 31. When in use, the steel plate 4 is fixed to both sides of the supporting frame 2 by passing bolts through the connecting column, and the through-wall member 3 is fixedly connected to the steel plate 4 by the sealing member 41, so that the reinforcement unit and the through-wall member 3 are combined into a whole, so as to avoid the concrete 1 being poured into the mounting tube 31 when pouring the concrete 1, thereby affecting the subsequent installation of the cable.

[0034] At the same time, steel plates 4 are fixed on both sides of the roof, and when the cable passes through the roof, the friction between the cable and the roof can be reduced, and the wear of the cable casing can be reduced.

[0035] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that the technical means for solving the problems in the above-mentioned embodiments of the utility model can be used in combination to solve multiple technical problems at the same time. For those skilled in the art, several deformations and improvements can be made without departing from the technical solution of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A structure for preventing a large current conductor from passing through a roof and generating a circulating current, characterized in that: The invention comprises an installation structure, which comprises a connecting piece and at least three installation pipes penetrating the roof. The connecting piece is made of non-magnetic material. A discontinuity is arranged on the steel bar. The connecting piece is fixed on the steel bar and connects the discontinuity. The installation pipe is fixed on the supporting frame. Concrete is filled around the installation pipe and wraps the connecting piece, the steel bar and the installation pipe.

2. A structure for preventing a large current conductor from passing through a roof and generating a circulating current according to claim 1, characterized in that: The supporting frame includes at least two layers of steel meshes, the mounting structure also includes a mounting portion, the through-wall piece includes a mounting portion, the mounting pipe is fixedly arranged on the mounting portion to form the through-wall piece, and the through-wall piece is fixed between the steel meshes.

3. A structure for preventing a large current conductor from passing through a roof and generating a circulating current according to claim 2, characterized in that: The material of the connector is fiberglass.

4. A structure for preventing a large current conductor from passing through a roof and generating a circulating current according to claim 3, characterized in that: The outer diameter of the phase busbar is smaller than the hole diameter of the installation pipe.

5. The structure for preventing a large current conductor from passing through a roof and generating a circulating current according to claim 4, characterized in that: Reinforcement units are fixedly installed on both sides of the installation structure, and the reinforcement units include steel plates. The steel plates are arranged on both sides of the wall penetration pieces and fixedly connected to the concrete. Strip grooves for accommodating three-phase power cables are arranged on the steel plates. The installation pipes are located in the strip grooves, and the strip grooves are provided with copper or aluminum edging.

6. The structure for preventing a large current conductor from passing through a roof and generating a circulating current according to claim 1, characterized in that: It also includes a grounding wire. The supporting frame includes a first steel mesh and a second steel mesh. A flow guide is arranged between the first steel mesh and the second steel mesh. The flow guide is connected to the grounding wire.

7. The structure for preventing a large current conductor from passing through a roof and generating a circulating current according to claim 1, characterized in that: The connection method between the connector and the steel bar is wire tying.

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