CN101217069B - A pre-installed underground box-type transformer - Google Patents

Abstract

A pre-installed underground box-type transformer, including a transformer, a distribution cabinet and a prefabricated pit foundation, the transformer is set in the prefabricated pit foundation, and the pre-installed underground box-type transformer is also provided with a pit operation box, The above-mentioned pit operation box is located on the ground plane; the depth of the prefabricated pit foundation is lower than the height of the transformer, so that the terminals of the transformer are all higher than the ground plane and extend into the pit operation box, They are respectively connected to the power distribution cabinet through cables; the pit operation box is provided with a pit operation cover, so that maintenance personnel can maintain the transformer on the ground; the power distribution cabinet is arranged beside the pit operation cover. Since the transformer is buried in the prefabricated pit foundation, the terminal of the transformer is raised above the ground level, the depth of the pit is reduced, the difficulty of construction is reduced, and the terminal is effectively prevented from being immersed in water.

Description

A pre-installed underground box-type transformer

technical field

The invention relates to a substation, in particular to a pre-installed underground box-type transformer.

Background technique

China's urban construction has undergone old city demolition, road widening, building facade renovation and urban network transformation, and has gone through urban green space, cable power supply and lighting projects, and is now entering a stage aimed at improving streetscapes and city appearances. Urban beauty stage. Pedestrian commercial streets, leisure centers and boutique blocks successively launched in advanced cities can be said to be close to international standards, but the rectification of box-type substations occupying roads has had little effect, mainly because the urban pipe network is very complicated, and box-type substations can be seen everywhere. Substations not only occupy the space on the ground, but also are disorderly and disturbing, especially in urban residential areas, the electromagnetic radiation of box-type substations is even more worrying. In the prior art, the underground transformer technology has been adopted, but there are the following defects: (1) The pit occupies a large underground space, generally 2.5 to 3 meters deep, which makes the originally intertwined and complicated underground pipe network more crowded, and the groundwater In areas with high ground, the construction of earth pits is very difficult, and the transformer runs underwater, which may easily lead to water leakage at the cable head; (2) Since the depth of the pit is higher than that of the transformer, after the transformer fails, it must be repaired Personnel need to enter the pit for maintenance. Due to the limitation of the small space of the pit, the maintenance is very inconvenient and the maintenance time will be longer; (3) When the transformer needs to be replaced after a failure, due to the After setting up the advertising light box and the distribution box, it is necessary to disconnect all the connections of the distribution box, and lift the light box away from the pit cover, so that the pit cover can be opened to replace the transformer, so that the working time for replacing the transformer is as long as 4 hours. ~8 hours, and from the beginning of the power outage to the restoration of power supply, it actually needs to go through multiple links such as reporting faults, on-site inspections, formulating maintenance solutions, replacing transformers, and restoring power supply. hours, the power supply cannot be restored in time, causing great inconvenience to surrounding users; (4) Since the pit is only provided with vents on the top, the heat dissipation is extremely poor, and a forced ventilation mechanism must be installed, which will affect the underground transformer and related electrical components. Carry out timely heat exchange, once the forced ventilation mechanism fails, it is easy to cause the transformer to fail due to overheating; (5) Since the advertising light box on the ground plane is usually equivalent to the length of the pit, the area of the light box is relatively large , when the underground transformer is installed in a commercial block, it will cause certain visual obstacles to the shops and have an adverse effect on the commercial value of the shops, thus causing the power sector to suffer resistance when the underground transformer is constructed in the commercial block.

Contents of the invention

The purpose of the present invention is to provide a pre-installed underground box-type transformer. The transformer is installed underground and matched with the power distribution cabinet arranged above the ground, which saves space, is safe to operate, and is convenient for inspection and maintenance.

The technical solution of the present invention can be realized through the following technical measures. A prefabricated underground box-type transformer includes a transformer, a power distribution cabinet and a prefabricated pit foundation. The transformer is arranged in the prefabricated pit foundation. It is characterized in that the pre-installed underground box-type transformer is also equipped with a pit operation box, and the pit operation box is located on the ground plane; the depth of the prefabricated pit foundation is lower than the height of the transformer, so that the terminals of the transformer are uniform It is higher than the ground level and extends into the pit operation box, and is respectively connected to the power distribution cabinet through cables; the pit operation box is provided with a pit operation cover, so that maintenance personnel can operate on the ground The transformer is maintained; the power distribution cabinet is installed next to the pit operation cover. Because the transformer is buried in the prefabricated pit foundation, the space above the ground is greatly saved, and the terminal of the transformer is raised above the ground level, which reduces the depth of the pit and prevents the terminal from being immersed in water; it is located next to the power distribution cabinet The unique pit operation box greatly facilitates the maintenance of the transformer. There is a pit operation cover on the pit operation box. After opening the pit operation cover, the maintenance personnel can maintain the transformer on the ground, which is convenient and quick; even Remove the transformer as a whole from the pit foundation for repair or replacement. The size of the pit operation cover can be set according to requirements, either the entire top plate of the pit operation box can be used as the pit operation cover, or a part of the top plate of the pit operation box can be used as the pit operation cover.

The power distribution cabinet of the present invention includes two power distribution cabinets, which are respectively arranged on both sides above the transformer; the pit operation box is located between the two power distribution cabinets. The two power distribution cabinets are arranged separately to reduce the visual obstacles caused by them to the environment.

The present invention can be improved as follows, the power distribution cabinet is a light box type power distribution cabinet, that is, an advertising light box is provided on at least one side of each power distribution cabinet, so that the power distribution cabinet located above the ground plane The cabinet also plays the role of advertising and beautifying the environment.

The present invention can also be improved as follows, the lower part of the power distribution cabinet and the pit operation box are provided with vents, and the bottom of the pit operation box and the power distribution cabinet are connected to the inside of the prefabricated pit foundation The cavities are connected to achieve a good ventilation and heat dissipation effect. The bottom of the power distribution cabinet can also be connected with the underground environment on both sides of the prefabricated pit foundation, so that the underground cables can also be cooled and ventilated in time.

The present invention can also be further improved as follows, the top of the prefabricated pit foundation is provided with a pit cover, the pit cover can be a cement cover, and the power distribution cabinet and the pit operation box are both provided with on this cover. Ventilation passages are respectively provided on the pit cover plate at positions opposite to the power distribution cabinet and the pit operation box. In order to achieve ventilation and heat dissipation, to ensure the safe operation of electrical components. For example, a forced ventilation mechanism can be installed on the lower part of one of the power distribution cabinets, such as a fan, and the external air enters through the ventilation port of the power distribution cabinet and enters the prefabricated pit foundation through the ventilation channel on the pit cover. During heat exchange with the air in the pit, the hot air is discharged from the vents on the pit operation box and another power distribution cabinet through the ventilation channel on the pit box. Similarly, the forced ventilation mechanism can also be installed separately in the pit operation box; the forced ventilation mechanism can also be installed at the lower vent of the second power distribution cabinet at the same time, and the principle of ventilation and heat dissipation is the same as above.

In order to improve heat dissipation efficiency and achieve a better heat dissipation effect, the present invention can also be further improved as follows, a deflector is also provided in the prefabricated pit foundation, and the deflector is a vertical plate, preferably with Parallel to the side of the transformer, it can be installed on the pit cover, and can also be installed on the side wall in the pit, and is located between the ventilation passage below the power distribution cabinet and the ventilation passage below the pit operation box. In the process of heat dissipation, since the deflector can separate the hot air area and the cold air area, that is, the space containing the transformer separated by the deflector naturally becomes a hot air area due to the heat dissipation of the transformer, and the other side separated by the deflector The space without a transformer is a cold air area. The upper parts of the hot and cold air areas lead to the vents at the pit operation box or the power distribution cabinet respectively. The natural air flow is formed due to the rise of hot air and the fall of cold air, which can guide the flow of air. The orderly flow can also improve the heat dissipation efficiency of the pre-installed underground box-type transformer without the action of a forced ventilation mechanism, which can not only improve the reliability of heat dissipation, but also save energy.

The two distribution cabinets described in the present invention are respectively a high-voltage distribution cabinet and a low-voltage distribution cabinet, or both are high-voltage distribution cabinets, or both are low-voltage distribution cabinets, which can be flexibly set according to specific requirements .

The present invention can also be improved as follows, the prefabricated pit foundation can also be provided with an automatic drainage device, the automatic drainage device includes a submersible pump and a liquid level controller, when the water level is higher than the set height, the relay suction Closed, the water pump works; when the water level is lower than the set height, the relay is broken, and the water pump stops working.

The light box type power distribution cabinet of the present invention can be hinged between the advertising light box and the light box type power distribution cabinet, and a foldable self-locking support rod is provided between the advertising light box and the light box type power distribution cabinet. There is also a cylinder on the top. When it is necessary to replace the advertising content in the light box or to repair the light box, open the advertising light box to expose the side of the power distribution cabinet, and use the self-locking support rod to support the light box. The operation is convenient and fast. . The light box type power distribution cabinet may be that the top of the advertising light box is hinged to the top of the power distribution cabinet, or the side of the advertising light box is hinged to the side of the power distribution cabinet.

Lifting lugs can also be provided on both sides of the top of the transformer according to the present invention, so that the transformer can be easily removed from the prefabricated pit foundation as a whole.

Compared with prior art, the advantage of the present invention is:

(1) The pre-installed underground box-type transformer described in the present invention has a simple and novel structure. The transformer is placed below the ground level, which effectively saves space on the ground; a special pit operation box is provided above the transformer, and the wiring of the transformer The terminals are all extended into the pit operation box above the ground level, which effectively avoids leakage accidents caused by soaking the terminals in water, unless the entire city is flooded; raising the terminals of the transformer above the ground level also makes the prefabricated The space occupied by the foundation of the pit is reduced, and the depth of the pit can be reduced to about 1.5 meters; when the transformer fails, the maintenance personnel can repair the transformer on the ground, and even conveniently remove the transformer from the foundation of the pit Removed for maintenance or replacement, greatly reducing operating time and improving work efficiency;

(2) For the pre-installed underground box-type transformer of the present invention, since the depth of the pit is reduced during construction, the influence of the underground pipe network and the underground water level on the construction is also greatly reduced, thereby reducing the difficulty of construction;

(3) The pre-installed underground box-type transformer according to the present invention can be provided with an advertising light box on at least one side of the distribution cabinet above the ground, so that the distribution cabinet above the ground can simultaneously serve as an advertisement The role of publicity and beautification of the environment;

(4) The pre-installed underground box-type transformer of the present invention is equipped with a perfect ventilation and heat exchange system, which can conduct timely heat exchange for the underground transformer and related electrical components, greatly prolonging the service life of the equipment and reducing the maintenance rate.

Description of drawings

Fig. 1 is the top view of the preinstalled underground box-type transformer of embodiment 1 of the present invention;

Fig. 2 is a cross-sectional view of M ₁ -M ₁ in Fig. 1, wherein the light box on the front of the power distribution cabinet is removed, and the light boxes on the left and right sides of the power distribution cabinet are lifted;

Fig. 3 is a cross-sectional view of N ₁ -N ₁ in Fig. 1, wherein the light boxes on the front and rear sides of the power distribution cabinet are lifted;

Fig. 4 is the top view of the preinstalled underground box-type transformer of embodiment 2 of the present invention;

Fig. 5 is a cross-sectional view of M ₂ -M ₂ in Fig. 4, wherein the light boxes on both sides of the front of the distribution cabinet are lifted;

Fig. 6 is a cross-sectional view of N ₂ -N ₂ in Fig. 4, wherein the light box on the rear side of the power distribution cabinet is lifted;

Fig. 7 is the top view of the preinstalled underground box-type transformer of embodiment 3 of the present invention;

Fig. 8 is a cross-sectional view of M ₃ -M ₃ in Fig. 7, wherein the light box on the front of the power distribution cabinet is removed, and the light box on the outside of the front of the power distribution cabinet is lifted;

Fig. 9 is a cross-sectional view of N ₃ -N ₃ in Fig. 7, wherein the light boxes on the front and rear sides of the distribution cabinet are lifted;

Fig. 10 is a top view of a pre-installed underground box-type transformer according to Embodiment 4 of the present invention;

Fig. 11 is a cross-sectional view of M ₄ -M ₄ in Fig. 10, wherein the light box outside the front of the distribution cabinet is lifted;

Fig. 12 is a cross-sectional view of N ₄ -N ₄ in Fig. 10, wherein the light box on the rear side of the power distribution cabinet is lifted;

Fig. 13 is the front view of ventilation hood;

Fig. 14 is a top view of the internal structure of the ventilation hood.

Detailed ways

Example 1

Embodiment 1 of the present invention, as shown in Figures 1 to 3, Figure 13, and Figure 14, is a pre-installed underground box-type transformer, including a transformer 1, two power distribution cabinets 2, 3, a prefabricated pit foundation 4 and The pit operation box 5, the two power distribution cabinets 2 and 3 are high-voltage power distribution cabinets and low-voltage power distribution cabinets respectively, the transformer 1 is set in the prefabricated pit foundation 4, and there are lifting lugs 11 on both sides of the top of the transformer 1 . The high and low voltage power distribution cabinets are respectively arranged on both sides above the transformer 1, the pit operation box 5 is located between the two power distribution cabinets 2 and 3, the high and low voltage power distribution cabinets and the pit operation box 5 are located on the ground plane , so that the high and low voltage terminals 12 and 13 of the transformer 1 are all higher than the ground level and extend into the pit operation box 5, and are connected through the high voltage cable bushing 61 and the low voltage cable bushing 62 and the cables 71 and 72 respectively. Among the outgoing line cabinets of the high-voltage power distribution cabinet and the incoming line cabinets of the low-voltage power distribution cabinets, the incoming line cabinets of the high-voltage power distribution cabinets are connected with high-voltage incoming cables 81 , and the outgoing line cabinets of the low-voltage power distribution cabinets are connected with low-voltage outgoing line cables 82 . The height of the pit operation box 5 is adapted to the height of the connection terminal of the transformer 1 above the ground plane, generally no more than 50-60 cm, and it is advisable not to block the line of sight. Pit operation box 5 is also provided with pit operation cover 51, the longitudinal section of pit operation cover 51 is a "door" shape, including a top surface and two sides, and the side bottom of one side of pit operation cover 51 is hinged. At the bottom of the pit operation box 5, after the pit operation cover 51 is opened, sufficient operating space is provided for maintenance personnel. The bottom of the pit operation box 5 and the bottoms of the high and low voltage power distribution cabinets are all above the ground level.

The top of the prefabricated pit foundation 4 is provided with a pit cover 41, the pit cover 41 is a cement cover, and the high and low voltage power distribution cabinets and pit operation box 5 are all set on the cement pit cover 41 . Advertising light boxes 9 are arranged on four sides of each distribution cabinet in this embodiment. The top of the advertising light box 9 is hinged with the top of the high-voltage power distribution cabinet or the low-voltage power distribution cabinet, and a foldable self-locking support rod 91 is provided between the advertising light box 9 and the power distribution cabinet. There is a cylinder 92. When it is necessary to replace the advertising content in the light box or to repair the light box, or to open the main door of the power distribution cabinet for maintenance, you only need to lift the advertising light box 9 to expose the power distribution cabinet, and use the self-locking support rod 91 The advertising light box 9 can be supported. Vents 10 are provided on the lower part of the surrounding sides of the high and low voltage power distribution cabinets and the side of the pit operation box 5, and a louvered ventilation hood 101 is provided at the above-mentioned ventilation openings 10, and a ventilating hood 101 is provided on the inside of the ventilation hood 101. The stainless steel screen 102 satisfies a higher protection level, and a plurality of ventilation holes 103 are also provided on the upper edge of the ventilation cover 101, which further increases the ventilation area, and the ventilation effect is better. On the cement pit cover plate 41, ventilation passages are respectively provided at positions opposite to the high and low voltage power distribution cabinets and the pit operation box 5, so that the bottom of the pit operation box 5 and the high and low voltage power distribution cabinets are in line with the prefabricated The internal cavity of the type pit foundation 4 is connected. In this embodiment, a cooling fin 19 is also provided on the transformer 1 . There is also a vertical deflector 16 inside the prefabricated pit foundation 4. The deflector 16 is parallel to the side of the transformer 1. The top of the deflector 16 is fixedly installed on the pit cover 41 and is located in the high-voltage power distribution system. Between the ventilation channel 14 below the cabinet and the ventilation channel 15 below the pit operation box 5, the deflector 16 separates the cold air area and the hot air area to guide the orderly flow of air: the external air enters through the vent 10 of the high-voltage power distribution cabinet , and enter the prefabricated pit foundation 4 through the ventilation channel 14 on the pit cover plate 41, and exchange heat with the air in the pit, and then the hot air passes through the ventilation channel under the pit operation box 5 and the low-voltage power distribution cabinet respectively 15. Finally, it is discharged from the vent 10 provided on the pit operation box 5 and the low-voltage power distribution cabinet. The bottom of the high-voltage and low-voltage distribution cabinets is also connected to the underground environment on both sides of the prefabricated pit foundation 4, so that the underground cables can also be cooled and ventilated in time.

The prefabricated pit foundation 4 of the present embodiment is also provided with an automatic drainage device 17, which includes a submersible pump and a liquid level controller. The automatic drainage device 17 is connected with a drain pipe 18. When the water level is higher than the set When the water level is lower than the set height, the relay is disconnected and the water pump stops working.

Example 2

Embodiment 2 of the present invention is as shown in Figures 4 to 6. The difference from the previous embodiment is that, on each power distribution cabinet, advertising light boxes 9 are arranged on three sides except the front, and the installation of the light boxes Mode is the same as embodiment 1. And in this embodiment, two vertical deflectors 16 are installed in the prefabricated pit foundation 4, and the tops of the two deflectors 16 are fixedly installed on the pit cover 41, and the two deflectors 16 are symmetrical Arranged on both sides of the transformer 1, and respectively located between the ventilation channel 14 under the high/low voltage power distribution cabinet and the ventilation channel 15 under the pit operation box 5, the external air is ventilated by the high voltage power distribution cabinet and the low voltage power distribution cabinet into the prefabricated pit foundation 4 through the ventilation channel 14 on the pit cover plate 41 to exchange heat with the air in the pit, and then the hot air passes through the ventilation channel 15 under the pit operation box 5, and finally It is discharged from the vent 10 provided on the pit operation box 5 .

Example 3

Embodiment 3 of the present invention is shown in Figures 7 to 9. The difference from the previous embodiment is that on each power distribution cabinet, except for the inner side adjacent to the pit operation box 5, the remaining three sides Advertisement light boxes 9 are all arranged on the top. The installation method of the light box is the same as in Embodiment 2.

Example 4

Embodiment 4 of the present invention is shown in Figures 10 to 12. The difference from Embodiment 1 is that on each power distribution cabinet, except for the front and the inner side adjacent to the pit operation box 5, the other two Advertisement light box 9 is all provided with on the side. The installation method of the light box is the same as in Embodiment 1.

In the above embodiments, a fan can also be installed at the lower vent of the power distribution cabinet, and the fan can accelerate the exchange of hot and cold air, thereby further improving the heat dissipation efficiency. The two power distribution cabinets of light box structure can also be both high-voltage power distribution cabinets, or both can be low-voltage power distribution cabinets, which can be flexibly set according to actual needs. The deflector located in the prefabricated pit foundation can also be fixedly installed on the side wall of the pit through a bracket, and is located between the ventilation channel under the power distribution cabinet and the ventilation channel under the pit operation box. On the power distribution cabinet with a light box structure, the side of the advertising light box may also be hinged to the side of the power distribution cabinet. The size of the pit operation cover can be set according to requirements, either the entire top plate of the pit operation box can be used as the pit operation cover, or a part of the top plate of the pit operation box can be used as the pit operation cover. The automatic drainage device provided in the prefabricated pit foundation can also be a drainage device composed of a one-way valve and a pipe joint.

Claims (10)

1. pre-buried package transformer, comprise transformer (1), power distribution cabinet and prefabricated melt pit basis (4), described transformer (1) is arranged in the prefabricated melt pit basis (4), it is characterized in that pre-buried package transformer also is provided with melt pit control box (5), described melt pit control box (5) is positioned on the ground level; The degree of depth on described prefabricated melt pit basis (4) is lower than the height of transformer (1), and the binding post that makes transformer (1) is plane and extending in the described melt pit control box (5) above Ground all, and is connected with power distribution cabinet by cable respectively; Described melt pit control box (5) is provided with melt pit operation lid (51), and the maintenance personal just can be keeped in repair transformer on the ground; It is other that power distribution cabinet then is arranged on melt pit operation lid (51).

2. a kind of pre-buried package transformer according to claim 1 is characterized in that described power distribution cabinet comprises two power distribution cabinets (2,3), is arranged in the both sides of described transformer (1) top; Described melt pit control box (5) is positioned between two power distribution cabinets (2,3).

3. a kind of pre-buried package transformer according to claim 2 is characterized in that described power distribution cabinet is the lamp box type power distribution cabinet, promptly is provided with advertising lamp box (9) at least one side of described each power distribution cabinet.

4. a kind of pre-buried package transformer according to claim 3, it is characterized in that being equipped with ventilating opening (10) on the bottom of described power distribution cabinet and the melt pit control box (5), and the bottom of melt pit control box (5) and described power distribution cabinet is connected with the internal cavities on prefabricated melt pit basis (4).

5. a kind of pre-buried package transformer according to claim 4 is characterized in that the top on described prefabricated melt pit basis (4) is provided with melt pit cover plate (41), and described power distribution cabinet and melt pit control box (5) all are located on this cover plate.

6. a kind of pre-buried package transformer according to claim 5 is characterized in that on described melt pit cover plate (41), and the position relative with melt pit control box (5) with power distribution cabinet is respectively equipped with vent passages.

7. a kind of pre-buried package transformer according to claim 6, it is characterized in that also being provided with in the described prefabricated melt pit basis (4) baffler (16), this baffler (16) is a vertical plate, and, and be positioned between the vent passages and the vent passages below the melt pit control box (5) of power distribution cabinet below with the parallel sided of transformer (1).

8. according to claim 2 or 3 or 4 or 5 or 6 or 7 described a kind of pre-buried package transformers, it is characterized in that described two power distribution cabinets (2,3), be respectively a high voltage power distributing cabinet and a low-voltage distribution cabinet, or the two is high voltage power distributing cabinet, or the two is low-voltage distribution cabinet.

9. a kind of pre-buried package transformer according to claim 8 is characterized in that also being provided with self-draining arrangement (17) in the described prefabricated melt pit basis (4), and this self-draining arrangement (17) comprises immersible pump and fluid level controller.

10. a kind of pre-buried package transformer according to claim 3, it is characterized in that described lamp box type power distribution cabinet, described advertising lamp box (9) is hinged with described lamp box type power distribution cabinet, and between described advertising lamp box (9) and lamp box type power distribution cabinet, be provided with Foldable self-locking formula support bar (91), also be provided with cylinder (92) on this support bar (91).

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