CN111834090A - Drainage system for buried transformer - Google Patents

Abstract

The invention discloses a drainage system for an underground transformer, which belongs to the field of the underground transformer, and relates to a drainage system for the underground transformer, which can realize the purpose that through reasonable design, in the rainstorm concentration period, rapid drainage can be realized through an anti-impurity cover and an anti-transpiration cover, a large amount of rainwater is not easy to gather in an installation foundation pit, in the non-rainfall period, the anti-transpiration cover can be pushed back to a drain hole under the action of a compression spring in a compression state, the sealing of the drain hole is realized, the transpiration backflow of underground water is effectively prevented, when the working environment of a transformer main body is overheated, air with lower temperature in an underground water path can be pumped out by a cooling fan to cool the transformer main body, the influence of an underground water network and concentrated rainfall on the underground transformer is greatly reduced, and the construction cost of a drainage and seepage-proof water system in the construction process of the underground transformer is reduced, the construction cost of the buried transformer is greatly reduced.

Description

Drainage system for buried transformer

Technical Field

The invention relates to the field of buried transformers, in particular to a drainage system for a buried transformer.

Background

The transformer is a device for changing alternating voltage by utilizing the principle of electromagnetic induction, and is one of the most important basic devices for realizing a remote alternating current power supply system. In traditional power line's the process of laying, the electric wire utilizes special wire pole to lay with the transformer usually, it is comparatively convenient, the technical staff of being convenient for simultaneously carries out routine maintenance and repair, however along with the acceleration of city construction process, the problem of aerial wiring also shows gradually, vertically and horizontally staggered's circuit influences the city appearance, it is ageing easily to cause the electric wire to receive sunshine direct injection simultaneously for a long time, easily induce the incident, also the phase change has increased the routine maintenance cost of alternating current circuit, consequently, now in city planning design, the infrastructure of alternating current transport such as transmission line and transformer is buried underground usually.

The buried transformer is suitable for urban environments (installed in basements or cellars), particularly suitable for central cities with dense population, and suitable for lighting and power systems of streets, highways, bridges, tunnels, parking lots, airports, ports, tourist attractions and the like, high-voltage and low-voltage inlet and outlet wires adopt a waterproof, fully-sealed, fully-insulated and fully-shielded wiring mode, a box body shell is made of anticorrosive stainless steel, is fully sealed and can be immersed in water within a period of time, a protection system fully considers the convenience and safety of operation, and accessories adopt products of the American PER COO company; the buried transformer is operated by adopting the operating rod, has the same operation mode as the combined transformer, fully considers the particularity of the heat dissipation condition, and adopts the design of low loss and low temperature; and measures for preventing water from entering the transformer cellar and automatically draining water are arranged in the transformer cellar.

In areas with dry weather and less annual rainfall, the buried transformer is convenient to use and is not easy to cause water soaking accidents, but in areas with wet weather and long rainy seasons and with concentration, a local abundant underground water network needs to be considered for the arrangement of the buried transformer, otherwise, the underground water level which is easily caused by a large amount of rainfall rises, the transformer is easily soaked for a long time, and the transformer is damaged, so that the buried transformer is rich in underground water network, rich in annual rainfall and is usually required to be matched with a drainage and seepage-proofing water system with high construction cost when the buried transformer is constructed in the concentrated areas, and the construction cost of the buried transformer is greatly increased.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a drainage system for an underground transformer, which can greatly reduce the influence of an underground water network and concentrated rainfall on the underground transformer, reduce the construction cost of a drainage and seepage prevention system in the construction process of the underground transformer and greatly reduce the construction cost of the underground transformer through reasonable design.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A drainage system for an underground transformer is characterized in that an installation foundation pit is dug on a foundation, an underground water path is arranged in the foundation, the installation foundation pit is located on the upper side of the underground water path, a foundation pit cover matched with the installation foundation pit is fixedly connected to a notch of the installation foundation pit, a drainage groove is dug on a groove bottom plate of the installation foundation pit, an installation platform is arranged at the center of the drainage groove, a transformer main body is fixedly connected to the installation platform, a plurality of uniformly distributed drainage holes are dug on the groove bottom plate of the drainage groove, an anti-transpiration cover matched with the drainage hole is inserted into the drainage holes, the anti-transpiration cover comprises an inverted cover body, a pair of side lug blocks is fixedly connected to the side wall of the inverted cover body, a limit sliding groove matched with the side lug blocks is fixedly connected to the side wall of the inverted cover body, and limit is realized between the drainage holes and the anti-transpir, fixedly connected with compression spring between side position ear piece and the spacing spout lateral wall, it has the sieve mesh to cut on the side position ear piece lateral wall, fixedly connected with and self assorted screen cloth in the sieve mesh, fixedly connected with and anti-transpiration cover assorted anti-miscellaneous cover on the groove bottom plate of water drainage tank, anti-miscellaneous cover includes the main cover body, cut on the lateral wall of the main cover body has anti-miscellaneous hole, the position at anti-miscellaneous hole place is higher than water drainage tank groove bottom plate, anti-miscellaneous downthehole fixed even have with self assorted anti-miscellaneous net, can realize through rational design, reduce groundwater net and concentrate precipitation to the influence of burying formula transformer by a wide margin, reduce the construction cost who buries formula transformer construction in-process drainage and prevention of seepage water system, reduce the construction cost of burying formula transformer by a wide margin.

Furthermore, the compression spring is inserted with the gag lever post, one section that spacing spout lateral wall was kept away from to the gag lever post runs through side position ear piece, and the gag lever post can play the guard action, makes compression spring be difficult for taking place the non-working under present exogenic action to deformation, is difficult for influencing compression spring's normal work.

Furthermore, be connected with wear-resisting ring between gag lever post and the side position ear piece, wear and tear between gag lever post and the side position ear piece can be reduced by a wide margin to wear and tear, makes the be difficult for appearing rocking of being connected between gag lever post and the side position ear piece.

Further, the tank bottom plate of installation foundation ditch is dug and is had a plurality of louvres, and louvre evenly distributed is in the outside of water drainage tank, louvre intercommunication installation foundation ditch and underground water route, the inner wall fixedly connected with and self assorted radiator fan of louvre because the specific heat capacity of water is higher, receives sunshine at external ambient temperature and shines when too high, and the temperature in the underground water route can be in lower level because of the reason that groundwater exists, and the cold air that radiator fan took out in following the underground water route this moment can increase the radiating effect to the transformer main part.

Furthermore, a heat dissipation cover matched with the heat dissipation hole is inserted in the heat dissipation hole, the heat dissipation cover is positioned at the upper side of the heat dissipation fan, the heat dissipation cover comprises a heat dissipation cover body matched with the heat dissipation hole, a pair of limiting lug blocks is fixedly connected to the side wall of the heat dissipation cover body, lug block grooves matched with the limiting lug blocks are cut on the side wall of the heat dissipation hole, the heat dissipation cover realizes limiting sliding in the heat dissipation hole through the matching between the limiting lug blocks and the lug block grooves, a plurality of uniformly distributed separation holes are cut on the side wall of the heat dissipation cover body, the heat dissipation cover has the function of sealing the heat dissipation hole, so that underground water in an underground water path is not easy to flow back to a foundation pit through the heat dissipation hole under the transpiration effect, when the heat dissipation fan is started to perform auxiliary heat dissipation on the transformer main body, an ascending airflow formed by the heat dissipation fan can jack up (1301) and is uniformly dissipated through, and carrying out auxiliary heat dissipation on the transformer main body.

Furthermore, the heat dissipation holes are internally and fixedly connected with separation nets matched with the heat dissipation holes, the separation nets can prevent the separation holes from being blocked, impurities are not easy to affect the falling back of the heat dissipation cover into the heat dissipation holes, and the sealing of the heat dissipation holes is not easy to be affected in the non-heat dissipation process.

Furthermore, the heat dissipation cover body and the separation net are made of light materials, and the limiting lug blocks are made of materials with high density, so that the heat dissipation cover is light and heavy on the whole, can quickly slide down into the heat dissipation holes under the condition of no external force, and can be easily jacked up by airflow of the stroke of the heat dissipation fan in the working process of the heat dissipation fan.

Further, sliding connection has flood control groove with self assorted in the louvre, and flood control groove is located radiator fan's downside, flood control groove's lateral wall is dug there is the bleeder vent, the bleeder vent is located flood control groove and keeps away from radiator fan's one side, flood control groove selects to be made with light plastics, flood control groove's density is less than the density of water, and groundwater level rises because of the rainfall explosion in groundwater way after, the surface of water that rises can hold in the palm flood control groove to lift and send back in the louvre, play the effect of sealed louvre, make the groundwater that rises by explosion be difficult for passing the louvre backward flow, be difficult for resulting in the transformer main part to be soaked.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

this scheme can realize through rational design, in the concentrated period of heavy rain, can be through preventing miscellaneous cover and anti-transpiration cover, realize quick drainage, be difficult for causing a large amount of rainwater gathering in the installation foundation ditch, and in the non-rainfall period, anti-transpiration cover can push back to the wash port under the compression spring effect under being in compression state, realize the sealed to the wash port, effectively prevent groundwater transpiration backward flow, and when transformer main part operational environment is overheated, can utilize radiator fan to take out the lower air of temperature in the underground water route for transformer main part cooling, reduce the operating temperature of transformer main part, reduce the influence of groundwater net and concentrated precipitation to buried formula transformer by a wide margin, reduce the construction cost who buries formula transformer construction in-process drainage and anti-seepage water system, reduce the construction cost of buried formula transformer by a wide margin.

Drawings

FIG. 1 is a schematic sectional view of the main structure of the drainage system of the buried transformer of the present invention;

FIG. 2 is a front cross-sectional view of the vent of the present invention;

FIG. 3 is a schematic view of the structure at A in FIG. 2

FIG. 4 is a schematic structural view of a heat sink of the cooling fan of the present invention during standby;

FIG. 5 is a schematic view of the structure at B in FIG. 3;

FIG. 6 is a top view of the buried transformer drainage system with the pit cover removed;

FIG. 7 is a schematic structural view of the miscellaneous shield of the present invention;

FIG. 8 is a schematic structural view of the transpiration prevention cover of the present invention

Fig. 9 is a schematic structural diagram of the heat dissipation cover of the present invention.

The reference numbers in the figures illustrate:

the anti-transpiration heat-dissipation device comprises a foundation 1, an installation foundation pit 2, an underground waterway 3, a water drainage tank 4, a foundation pit cover 5, a transformer main body 6, an anti-transpiration cover 7, an inverted cover body 701, a screen 702, lug blocks at 703 side positions, a limit sliding groove 8, a limit rod 9, a compression spring 10, an anti-impurity cover 11, a main cover body 1101, an anti-impurity net 1102, a heat-dissipation fan 12, a heat-dissipation cover 13, a heat-dissipation cover 1301, a limit lug block 1302, a separation net 1303, a lug groove 14 and a flood control cover 15.

Detailed Description

The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-3 and 6-8, a drainage system for an underground transformer comprises an installation foundation pit 2 excavated on a foundation 1, an underground waterway 3 is arranged in the foundation 1, the installation foundation pit 2 is positioned at the upper side of the underground waterway 3, a foundation pit cover 5 matched with the installation foundation pit 2 is fixedly connected at the notch of the installation foundation pit 2, a drainage groove 4 is excavated on the groove bottom plate of the installation foundation pit 2, an installation platform is arranged at the center of the drainage groove 4, a transformer main body 6 is fixedly connected on the installation platform, a plurality of drainage holes are evenly distributed on the groove bottom plate of the drainage groove 4, an anti-transpiration cover 7 matched with the drainage holes is inserted in the drainage holes, the anti-transpiration cover 7 comprises an inverted cover body 701, a pair of side lug blocks 703 is fixedly connected on the side wall of the inverted cover body 701, a limit chute 8 matched with the side lug blocks 703 is fixedly connected on the side wall of the drainage holes, and the anti-transpiration cover 7 realize limit through the side lug blocks 703 and the, fixedly connected with compression spring 10 between side position ear piece 703 and the 8 lateral walls of spacing spout, it has the sieve mesh to cut on the side position ear piece 703 lateral wall, fixedly connected with and self assorted screen cloth 702 in the sieve mesh, fixedly connected with and anti-transpiration cover 7 assorted anti-miscellaneous cover 11 on the groove bottom plate of water drainage tank 4, anti-miscellaneous cover 11 includes the main cover body 1101, it has anti-miscellaneous hole to cut on the lateral wall of the main cover body 1101, the position at anti-miscellaneous hole place is higher than water drainage tank 4 groove bottom plate, anti-miscellaneous downthehole fixed link have with self assorted anti-miscellaneous net 1102.

Particularly, the underground waterway 3 is naturally formed and is not dug artificially, the position and the shape of the underground waterway 3 are required to be detected in advance in the installation and site selection process of the transformer main body 6, the site selection position of the installation foundation pit 2 is required to be at a higher position of the integral terrain, so that the underground water in the underground waterway 3 is not easy to flow back into the installation foundation pit 2 to soak the transformer main body 6 due to the rising of rainstorm, the rainwater flows into the installation foundation pit 2 through the foundation pit cover 5, the rainwater can be collected in the drainage groove 4 due to the lower integral terrain of the drainage groove 4 in the installation foundation pit 2 and flows into the anti-transpiration cover 7 through the anti-impurity cover 11, the total weight of the anti-transpiration cover 7 is increased along with the increase of the rainwater in the anti-transpiration cover 7, the compression spring 10 is compressed until the screen 702 on the anti-transpiration cover 7 is positioned at the lower side of the upper wall of the underground waterway 3, and the rainwater, in the non-rainfall process, the compression spring 10 in the compression state can integrally push the anti-transpiration cover 7 to the position shown in fig. 2 and 4, at the moment, the drain hole is sealed, the underground water in the underground water channel 3 is not easy to rise into the installation foundation pit 2 along the drain hole through the transpiration effect, the overhigh humidity in the installation foundation pit 2 is not easy to cause influence on the normal heat dissipation of the transformer main body 6, the arrangement of the anti-transpiration cover 11 can effectively prevent large-mass sundries mixed with rainwater from falling into the anti-transpiration cover 7, the integral quality of the anti-transpiration cover 7 is not easy to rise, the compression spring 10 is not easy to move downwards due to the dead weight of the anti-transpiration cover 7 and the sundries, the sealing drain hole is not easy to fail, the anti-transpiration net 1102 higher than the groove bottom plate of the drainage groove 4 can be prevented from being blocked by the sundries mixed with rainwater due to the design, the normal drainage, the influence of an underground water net and concentrated rainfall on the buried transformer is greatly reduced, the construction cost of a drainage and seepage prevention system in the construction process of the buried transformer is reduced, and the construction cost of the buried transformer is greatly reduced.

In order to protect the safety of the transformer body 6, the side walls of the installation foundation pit 2, the underground waterway 3 and the drainage channel 4 need to be reinforced by concrete or other substances.

Please refer to fig. 3, a limiting rod 9 is inserted in the compression spring 10, a section of the limiting rod 9 far away from the side wall of the limiting chute 8 runs through the side lug 703, the limiting rod 9 can play a role in protection, so that the compression spring 10 is not easy to generate non-working deformation under the action of external force, and the compression spring 10 is not easy to influence normal work, a wear ring is connected between the limiting rod 9 and the side lug 703, the wear ring can greatly reduce the wear between the limiting rod 9 and the side lug 703, and the connection between the limiting rod 9 and the side lug 703 is not easy to shake.

Referring to fig. 4-6 and fig. 9, a plurality of heat dissipation holes are drilled on the bottom plate of the installation foundation pit 2, and the heat dissipation holes are uniformly distributed on the outer side of the drainage channel 4, the heat dissipation holes are communicated with the installation foundation pit 2 and the underground waterway 3, the inner walls of the heat dissipation holes are fixedly connected with the heat dissipation fans 12 matched with the heat dissipation holes, because the specific heat capacity of water is high, when the external environment temperature is too high by sunlight, the temperature in the underground waterway 3 is at a lower level due to the existence of underground water, at this time, the cold air pumped out from the underground waterway 3 by the heat dissipation fans 12 can increase the heat dissipation effect on the transformer body 6, the heat dissipation covers 13 matched with the heat dissipation holes are inserted in the heat dissipation holes, the heat dissipation covers 13 are positioned on the upper sides of the heat dissipation fans 12, the heat dissipation covers 13 comprise heat dissipation cover bodies 1301 matched with the heat dissipation holes, a pair of limiting lugs 1302 are fixedly connected to the side walls of the, the heat dissipation cover 13 realizes limited sliding in the heat dissipation holes through the matching between the limiting lug blocks 1302 and the lug block grooves 14, a plurality of uniformly distributed separation holes are cut on the side wall of the heat dissipation cover body 1301, the heat dissipation cover 13 has the function of sealing the heat dissipation holes, so that underground water in the underground waterway 3 is not easy to flow back into the installation foundation pit 2 through the heat dissipation holes under the transpiration effect, when the heat dissipation fan 12 is started to perform auxiliary heat dissipation on the transformer main body 6, the ascending airflow formed by the heat dissipation fan 12 can jack up the heat dissipation fan 1301 and is uniformly dissipated through the separation holes to perform auxiliary heat dissipation on the transformer main body 6, a separation net 1303 matched with the heat dissipation holes is fixedly connected in the heat dissipation holes, the separation net 1303 can prevent the separation holes from being blocked, sundries are not easy to influence the heat dissipation holes in which the heat dissipation cover 13 falls back, and the sealing of the heat dissipation holes in the non-heat dissipation process is not, the limiting lug blocks 1302 are made of a material with higher density, so that the heat dissipation cover 13 is light on the whole and heavy on the whole, can quickly slide down into the heat dissipation holes without external force, and can be easily jacked up by airflow of the stroke of the heat dissipation fan 12 in the working process of the heat dissipation fan 12.

Sliding connection has flood control groove 15 with self assorted in the louvre, and flood control groove 15 is located radiator fan 12's downside, flood control groove 15's lateral wall is dug there is the bleeder vent, the bleeder vent is located flood control groove 15 one side of keeping away from radiator fan 12, flood control groove 15 chooses for use light plastics to make, flood control groove 15's density is less than the density of water, groundwater level rises because of the rainfall violence back in secret water route 3, the surface of water that rises can hold up flood control groove 15, and lift and send back in the louvre, play the effect of sealed louvre, make the groundwater that rises violently be difficult for passing the louvre backward flow, be difficult for leading to transformer main part 6 to be soaked.

In particular, in the scheme, the heat radiation fan 12 needs a mains supply to supply power, meanwhile, the control terminal controls the work of the heat radiation fan 12, the control terminal is connected with the internet of things module, the control terminal can acquire real-time temperature data of the position of the transformer main body 6 from the material network module, the temperature data can be from temperature detection, and can also be from real-time temperature detected by a temperature sensor embedded in the installation foundation pit 2, the temperature data can be selected according to actual construction cost, when the temperature data is too high, the control terminal controls the heat radiation fan 12 to be started, auxiliary heat radiation work is carried out on the transformer main body 6, when the temperature data is too low, the control terminal controls the heat radiation fan 12 to be closed, heat radiation holes are sealed, and water vapor in the underground water channel 3 is prevented from rising due to evaporation.

This scheme can realize through rational design, in the concentrated period of heavy rain, can be through preventing miscellaneous cover 11 and transpiration prevention cover 7, realize quick drainage, be difficult for causing a large amount of rainwater gathering in installation foundation ditch 2, and in the non-rainfall period, transpiration prevention cover 7 can push back to the wash port under the compression spring 10 effect under the compression state, realize the sealed to the wash port, effectively prevent groundwater transpiration backward flow, and when 6 operational environment of transformer main part is overheated, can utilize radiator fan 12 to take out the lower air of temperature in 3 underground water routes for transformer main part 6 cooling, reduce the operating temperature of transformer main part 6, reduce the influence of groundwater net and concentrated precipitation to buried transformer by a wide margin, reduce buried transformer construction in-process drainage and the cost of construction of anti-seepage water system, reduce buried transformer's construction cost by a wide margin.

The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.

Claims (8)

1. The utility model provides a drainage system for bury formula transformer, excavate installation foundation ditch (2) on ground (1), be equipped with secret water route (3) in ground (1), and install the upside that foundation ditch (2) are located secret water route (3), the notch fixedly connected with of department and self assorted foundation ditch lid (5) of installation foundation ditch (2), it has water drainage tank (4) to excavate on the groove bottom plate of installation foundation ditch (2), the center of water drainage tank (4) is equipped with the mount table, fixedly connected with transformer main part (6), its characterized in that on the mount table: the bottom plate of the drainage channel (4) is provided with a plurality of uniformly distributed drainage holes, the drainage holes are internally inserted with an anti-transpiration cover (7) matched with the drainage holes, the anti-transpiration cover (7) comprises an inverted cover body (701), the side wall of the inverted cover body (701) is fixedly connected with a pair of side lug blocks (703), the side wall of the drainage hole is fixedly connected with a limiting sliding groove (8) matched with the side lug blocks (703), a compression spring (10) is fixedly connected between the side lug blocks (703) and the side wall of the limiting sliding groove (8), the side lug blocks (703) are provided with sieve holes, a sieve mesh (702) matched with the sieve mesh is fixedly connected in the sieve holes, the bottom plate of the drainage channel (4) is fixedly connected with an anti-impurity cover (11) matched with the anti-transpiration cover (7), and the anti-impurity cover (11) comprises a main cover body (1101), the side wall of the main cover body (1101) is provided with an anti-impurity hole, the position of the anti-impurity hole is higher than the groove bottom plate of the drainage groove (4), and the anti-impurity hole is fixedly connected with an anti-impurity net (1102) matched with the anti-impurity hole.

2. The drainage system for an underground transformer of claim 1, wherein: the compression spring (10) is internally inserted with a limiting rod (9), and one section of the limiting rod (9) far away from the side wall of the limiting sliding groove (8) penetrates through the side lug block (703).

3. The drainage system for an underground transformer of claim 1, wherein: and a wear-resistant ring is connected between the limiting rod (9) and the side lug block (703).

4. The drainage system for an underground transformer of claim 1, wherein: the utility model discloses a construction method of water drainage tank, including installation foundation ditch (2), the tank bottom plate of installation foundation ditch (2) is opened chisel and is had a plurality of louvres, and louvre evenly distributed is in the outside of water drainage tank (4), louvre intercommunication installation foundation ditch (2) and secret water route (3), the inner wall fixedly connected with and self assorted radiator fan (12) of louvre.

5. The drainage system for the underground transformer of claim 4, wherein: the utility model discloses a heat dissipation cover, including radiator fan (12), radiator fan, fixed connection, radiator fan, radiator hole, the downthehole grafting of radiator hole have with self assorted radiator cover (13), radiator cover (13) are located the upside of radiator fan (12), radiator cover (13) include with radiator hole assorted radiator cover body (1301), a pair of spacing ear piece (1302) of fixedly connected with on the lateral wall of radiator cover body (1301), open on the lateral wall of radiator hole chisel have with spacing ear piece (1302) assorted ear piece groove (14), open on the lateral wall of radiator cover body (1301) and have a plurality of evenly distributed's separation hole.

6. The drainage system for the underground transformer of claim 4, wherein: and a separation net (1303) matched with the heat dissipation hole is fixedly connected in the heat dissipation hole.

7. The drainage system for the underground transformer of claim 5, wherein: the heat dissipation cover body (1301) and the separating net (1303) are made of light materials, and the limiting lug blocks (1302) are made of materials with high density.

8. The drainage system for the underground transformer of claim 4, wherein: the louvre sliding connection have with self assorted flood control groove (15), and flood control groove (15) are located radiator fan (12)'s downside, the lateral wall chisel of flood control groove (15) has the bleeder vent, the bleeder vent is located one side that radiator fan (12) were kept away from in flood control groove (15), flood control groove (15) select for use light plastics to make, the density in flood control groove (15) is less than the density of water.

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