CN223066641U - Medium-low voltage common box GIL for transformer substation - Google Patents

Abstract

The utility model discloses a medium-low voltage common box GIL for a transformer substation, which belongs to the technical field of medium-low voltage transmission, and comprises the GIL, a transformer, a GIS and a switch control cabinet, wherein the transformer, the GIS and the switch control cabinet form a circuit with the GIL, the upper part of the transformer is connected with a disconnecting switch through a low-voltage sleeve, a basin-type insulator is arranged on the disconnecting switch, one end of the disconnecting switch is connected with the GIL through the basin-type insulator, a wire inlet, a wire outlet and the switch control cabinet of the GIS are all connected with the GIL through the basin-type insulator, a radial corrugated pipe is arranged on a straight section unit connected with the GIL and the GIS for radial compensation, the angular corrugated pipe is arranged on a corner unit connected with the GIL for angular compensation, and the corresponding sleeve numbers of the transformer, the GIS and the switch control cabinet are consistent. The utility model provides a medium-low voltage co-tank GIL for a transformer substation, which can help to reduce occupied space, reduce production purchasing cost, improve circuit arrangement flexibility and improve service life of a device.

Description

Medium-low voltage common box GIL for transformer substation

Technical Field

The utility model relates to the technical field of medium-low voltage transmission, in particular to a medium-low voltage co-tank GIL for a transformer substation.

Background

A rigid gas insulated power transmission line (GIL) is high-voltage and high-current power transmission equipment which adopts gas insulation and is coaxially arranged with a shell and a conductor, the transmission power of the GIL can reach 4GW at present, the power transmission capacity is strong, and the average service life of the GIL is more than 50 years. Which is opposite to a conventional overhead line or power transmission cable, the high-capacity high-voltage long-distance power transmission line has the advantages of high reliability, long service life, strong transmission capacity, no influence of severe weather, special topography and other environmental factors, effective utilization of space resources, electromagnetic influence reduction, current-carrying capacity increase, low failure rate, convenient maintenance and the like, and is favorable for reducing the number of power transmission loops. And a compact closed structure is adopted, so that the occupied area is smaller than that of an overhead line. The arrangement mode is flexible, the system wiring can be simplified, the power supply reliability of the whole system is improved, and the system is a development trend of the current power transmission system.

However, GIL often encounters the following situations in engineering design of transformer substation rebuilding and expanding, energy storage projects:

1) Because the high altitude and low temperature area has complex installation topography, which results in more corners, interfaces need to be added to add current branches, install test equipment or introduce other auxiliary detection units, the transmission line is divided into two loops from one loop, and the occupied area and the cost of the equipment are increased;

2) The long-wire bushing is easily thermally deformed greatly, resulting in a short service life of the device.

Therefore, it is necessary to design a middle-low voltage co-tank GIL for a transformer substation, which can adapt to high altitude and low temperature areas with complex topography, help to reduce occupied space, reduce production purchase cost, improve flexibility of circuit arrangement, and improve service life of the device.

Disclosure of utility model

The present utility model is directed to overcoming the problems set forth in the background above, and provides a medium-low voltage common box GIL for a substation.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

A medium-low voltage common box GIL pipeline for a transformer substation comprises a GIL pipeline, a transformer, a GIS pipeline and a switch control cabinet, wherein the transformer, the GIS pipeline and the switch control cabinet form a circuit with the GIL pipeline, the upper part of the transformer is connected with a disconnecting switch through a low-voltage sleeve, a basin-type insulator is arranged on the disconnecting switch, one end of the disconnecting switch is connected with the GIL pipeline through the basin-type insulator, a wire inlet, a wire outlet and the switch control cabinet of the GIS pipeline are all connected with the GIL pipeline through the basin-type insulator,

Radial corrugated pipes are arranged on straight section units connected with the GIL pipeline and the GIS pipeline for radial compensation, and angular corrugated pipes are arranged on corner units connected with the GIL pipeline and the GIS pipeline for angular compensation.

Preferably, the transformer, the GIS pipeline and the switch control cabinet have the same corresponding sleeve number, and a plurality of matching interfaces are reserved on the GIL pipeline.

Preferably, the radial corrugated pipe and the angular corrugated pipe are single-wall corrugated pipes.

Preferably, the isolating switches are arranged above the transformer at least in a plurality, one ends of the isolating switches are connected with the transformer through low-voltage bushings, and the other ends of the isolating switches are connected with the GIL pipeline through basin-type insulators.

Preferably, the main pipe of the GIL pipeline is laid in an overhead manner.

Preferably, the voltage range suitable for the medium-low voltage common box GIL is 10kV-35kV.

Compared with the prior art, the technical scheme of the utility model has the beneficial effects that:

The utility model provides a middle-low voltage common box GIL for a transformer substation, which is suitable for high altitude and low temperature areas with complex environment, the application range is 10kV-35kV, a plurality of sets of transformers can share one box feeding GIL, the scale of the transformer substation can be compressed, the number of switching equipment is reduced, a GIL main pipe is laid in an overhead manner, the occupied area is effectively reduced, meanwhile, the cost is reduced, a GIS pipeline is connected with the GIL through two basin-type insulators of a wire inlet and outlet port, after the GIL is connected with a GIS pipeline wire inlet port, the three-phase sequence can be adjusted when the GIL is connected with the GIS pipeline wire outlet port, and is in butt joint with an overhead line, GIS pipeline equipment, transformer equipment and a cable.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the connection structure of GIL and transformer and isolation switch of the present utility model;

FIG. 3 is a schematic diagram of the connection between GIL and GIS according to the present utility model;

Fig. 4 is a schematic diagram of the connection structure between GIL and the switch cabinet according to the present utility model.

The figure shows that 1, a transformer, 2, an isolating switch, 3, GIL, 4, GIS, 5, a switch control cabinet, 6, a radial corrugated pipe, 7, an angular corrugated pipe and 8, a low-voltage sleeve.

Detailed Description

For a better understanding of the objects, structures and functions of the present utility model, the technical solution of the present utility model will be described in further detail with reference to the drawings and the specific preferred embodiments.

In the description of the present utility model, it should be understood that the terms "left", "right", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and "first", "second", etc. do not indicate the importance of the components, and thus are not to be construed as limiting the present utility model. The specific dimensions used in the examples are for illustration of the technical solution only and do not limit the scope of protection of the utility model. It will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Unless specifically stated or limited otherwise, the terms "mounted," "configured," "connected," "secured" and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

GIS (Gas Insulated Switchgear), a gas insulation combined electrical equipment, which consists of a breaker, an isolating switch, a grounding switch, a transformer, a lightning arrester, a bus, a connecting piece, an outgoing terminal and the like, is internally filled with SF6 insulation gas and is applied to high-voltage and ultrahigh-voltage equipment, thereby realizing the design of high compactness and miniaturization.

GIL (Gas Insulated Transmission Lines) rigid gas insulation power transmission line is a high voltage and large current power transmission device which adopts gas insulation, and a shell and a conductor are coaxially arranged, SF6 insulation gas is filled in the power transmission device, so that the design of high compactness and miniaturization is realized.

The technical scheme of the utility model is applicable to the voltage class of 10kV-35kV.

Specific embodiments of the present utility model will be described below.

Example 1:

Referring to fig. 1-4, a middle-low voltage common box GIL for a transformer substation comprises a GIL pipeline 3, and a transformer 1, a GIS pipeline 4 and a switch control cabinet 5 which form a circuit with the GIL pipeline 3, wherein the GIL pipeline 3 is composed of a plurality of straight section units, corner units and the like and is used for connecting the transformer 1, the GIS pipeline 4 and the switch control cabinet 5, the upper part of the transformer 1 is connected with a disconnecting switch 2 through a low-voltage sleeve 8, a basin-type insulator is arranged on the disconnecting switch 2, one end of the disconnecting switch 2 is connected with the GIL pipeline 3 through the basin-type insulator, the number of the disconnecting switch 2 depends on the loop number of the GIL, a plurality of line branches are needed to be added, and the connection of a plurality of different branches and the transformer is realized through the disconnecting switch 2.

The inlet, outlet and switch control cabinet 5 of GIS pipeline 4 are all connected with GIL pipeline 3 through basin insulator, radial corrugated pipe 6 is installed on the straight section unit that GIL pipeline 3 is connected with GIS pipeline 4 to carry out radial compensation, angular corrugated pipe 7 is installed on the corner unit that GIL pipeline 3 is connected with GIS pipeline 4 to carry out angular compensation, and after GIL pipeline 3 is connected with GIS pipeline 4 inlet, three-phase sequence can be adjusted when being qualified for next round of competitions from GIS pipeline 4 outlet.

In some embodiments, the transformer 1, the GIS pipeline 4 and the switch control cabinet 5 have the same corresponding sleeve number, and the GIL pipeline 3 is reserved with a plurality of matching interfaces.

In some embodiments, the radial corrugated pipe 6 and the angular corrugated pipe 7 are single-wall corrugated pipes, the number of single waves of the radial corrugated pipe 6 and the angular corrugated pipe 7 is a multiple of 2, the radial corrugated pipe 6 is used for adjusting basic errors and installation errors to ensure stability when the pipelines are in linear connection, the angular corrugated pipe 7 is used for compensating angle deflection caused by thermal expansion and contraction of the pipelines, the service life of the device is prolonged, and the number and arrangement sequence of the combination are determined according to the terrain laid by the power transmission lines or the requirement of adding ports of the radial corrugated pipe 6 and the angular corrugated pipe 7 in the pipelines 3.

In some embodiments, at least a plurality of isolating switches 2 are arranged above the transformer 1, one ends of the isolating switches 2 are connected with the transformer 1 through low-voltage bushings 8, the other ends of the isolating switches 2 are connected with the GIL pipeline 3 through basin insulators, in some specific application scenarios, circuit branches need to be added, and the isolating switches 2 are needed for breaking the gate between different circuits.

In some embodiments, the main pipe of the GIL pipeline 3 is laid in an overhead manner, and in some high-altitude low-temperature areas, such as the Tibet, the topography is complex and changeable, and the mountain forests are upright, and because the digging cost of the frozen soil layer in some high-altitude areas is high, the conventional laying mode of the main pipe of the GIL pipeline 3 is difficult to carry out, and the overhead treatment is needed to bypass some obstacles, so that the laying is convenient, the occupied area is effectively reduced, and the cost and the efficiency can be reduced.

In some embodiments, the voltage range suitable for the medium-low voltage common box GIL is 10kV-35kV, the medium-low voltage common box GIL provided by the utility model adopts a plurality of sets of transformer 1 outgoing lines to share one return GIL, is suitable for medium-low voltage grades, and has the advantages that as a transformer substation is rebuilt, the energy storage project is increased, the requirements of the GIL in the fields are increased gradually, the outgoing lines of a plurality of transformers 1 share one return GIL, the transformer substation scale can be compressed, the number of switching equipment is reduced, the cost is saved, the occupied area is saved, and the civil engineering cost is effectively reduced.

The method comprises the specific connection steps that a GIL pipeline 3 is connected with a transformer 1 and an isolating switch 2, the other end of the GIL pipeline 3 is connected with a wire inlet of a GIS pipeline 4, and is connected with a switch control cabinet 5 from the wire outlet of the GIS pipeline 4, a plurality of isolating switches 2 are added at the top of the transformer 1 according to actual requirements of a transformer substation, one isolating switch 2 controls one circuit branch, and meanwhile, the plurality of transformers 1 share one GIL loop. The working condition in the low-temperature area can be effectively optimized, the occupied area can be effectively saved, the production and purchasing costs are saved, the radial corrugated pipe 6 is installed on the straight section unit connected with the GIL pipeline 3 and the GIS pipeline 4 to carry out radial compensation, the angular corrugated pipe 7 is installed on the corner unit connected with the GIL pipeline 3 and the GIS pipeline 4 to carry out angular compensation, the basic error and the installation error can be effectively absorbed, the easy thermal deformation degree of the connecting part of the long-circuit sleeve is reduced, and the service life of the device is prolonged.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (6)

1. A medium-low voltage common box GIL for a substation, comprising a GIL pipeline (3) and a transformer (1), a GIS pipeline (4) and a switch control cabinet (5) which form a circuit with the GIL pipeline (3), characterized in that: the upper part of the transformer (1) is connected to the disconnector (2) through a low-voltage bushing (8), the disconnector (2) is provided with a pot-type insulator, and one end of the disconnector (2) is connected to the GIL pipeline (3) through the pot-type insulator; the inlet and outlet of the GIS pipeline (4) and the switch control cabinet (5) are all connected to the GIL pipeline (3) through the pot-type insulator, wherein: A radial bellows (6) is installed on the straight section unit where the GIL pipeline (3) and the GIS pipeline (4) are connected to perform radial compensation; and an angular bellows (7) is installed on the corner unit where the GIL pipeline (3) and the GIS pipeline (4) are connected to perform angular compensation. 2. The medium and low voltage common box GIL for a substation according to claim 1 is characterized in that the corresponding sets of the transformer (1), GIS pipeline (4) and switch control cabinet (5) are consistent, and a plurality of matching interfaces are reserved on the GIL pipeline (3). 3. The medium and low voltage common box GIL for a substation according to claim 1, characterized in that the radial bellows (6) and the angular bellows (7) are both single-wall bellows. 4. The medium- and low-voltage common box GIL for a substation according to claim 1 is characterized in that at least a plurality of the isolating switches (2) are arranged above the transformer (1), and one end of the plurality of isolating switches (2) is connected to the transformer (1) through a low-voltage bushing (8); the other end of the plurality of isolating switches (2) is connected to the GIL pipeline (3) through a pot-type insulator. 5. The medium and low voltage common box GIL for a substation according to claim 1, characterized in that the mother pipe of the GIL (3) is laid overhead. 6. The medium- and low-voltage common box GIL for a substation according to claim 1 is characterized in that the medium- and low-voltage common box GIL is applicable to a voltage range of 10kV-35kV.