CN202333559U - Box-type transformer substation with underground transformer - Google Patents

Abstract

The utility model provides a box-type transformer substation with an underground transformer. The box-type transformer substation comprises an underground box body, the underground transformer and a power distribution cabinet, wherein the underground box body is arranged underground; the underground transformer is arranged in the box body; and the power distribution cabinet is arranged above and connected with the underground box body, and is at least partially arranged on the ground. The box-type transformer substation disclosed by the utility model has the main advantages that the transformer is arranged underground, so that the transformer does not occupy surface area after being installed; the advertisement light box type power distribution cabinet is arranged so as to increase the visual effects; devices are arranged underground, thus preventing from outside breakage or stealing to a certain extent; and the maintenance-free period of the device is longer and the reliability of power supply is higher.

Description

Box-type substation with underground transformer

technical field

The utility model relates to the field of electrical equipment, in particular to a box-type substation of an underground transformer.

Background technique

With the continuous development of the economy and society, the process of urban construction is accelerating, and the improvement and beautification of the urban environment has become the top priority of Beijing's urban construction. Pedestrian commercial streets, leisure centers and urban boutique markets, whether it is greening or night scenes, are close to international standards, but municipal facilities, including traditional box-type substations for street lights, generally have problems affecting the aesthetics of the urban environment, which have not been effectively resolved. .

The particularity of the location of the street lamp determines the location of its power supply facilities. The traditional street lamp box-type substation is placed on the ground, which not only occupies the golden ground in the downtown area, but also is scattered and disorderly with the surrounding scenery, which is unsightly. Because of this, many common traditional box-type substations have become extremely uncoordinated in the new frame of reference after urban beautification. The traditional box-type substation currently in use occupies a large space and occupies the narrow space in the bustling area; the equipment is highly marked and easy to be stolen or damaged; it is easy to become a small advertising carrier and a visual "pollution source" affecting the urban environment; There is a possibility of electric shock for pedestrians above ground level.

Utility model content

The utility model provides a box-type substation of an underground transformer to solve the technical problems that the traditional box-type substation occupies space, is easily damaged, affects the appearance, and is dangerous in equipment.

The utility model is realized through the following technical solutions: the box-type substation of the underground transformer, including: the underground box, which is arranged below the ground; the underground transformer, which is arranged in the box; the power distribution cabinet, which is arranged above the underground box , connected to the underground box and located at least partially above the ground.

Further, the base plate of the pit is prefabricated to cover the underground box, and the upper surface has a connecting part connected with the power distribution cabinet.

Further, an openable operation cover is provided on the upper surface of the prefabricated pit base.

Further, the power distribution cabinet is provided with a ventilation mechanism, and the ventilation mechanism communicates with the interior of the underground box.

Further, the ventilation mechanism is a louver type ventilation mechanism.

Further, the underground box has a low-voltage cable outlet hole and a high-voltage cable inlet hole.

Further, a submersible pump is arranged in the underground box.

Further, the casing of the underground transformer is made of low-alloy structural steel.

Further, the power distribution cabinet has a light box or a display screen.

Further, the underground box body, the underground transformer, the prefabricated pit base plate and the power distribution cabinet are prefabricated and connected as one.

Through the above technical scheme, the main advantages of the box-type substation of the underground transformer of the present invention are that the transformer is placed underground, and the transformer does not occupy the surface area after installation; the advertising light box type distribution cabinet is installed to improve the visual effect; the facilities are underground to a certain extent It can avoid external damage or theft; the maintenance-free period of equipment is longer, and the reliability of power supply is higher.

Description of drawings

The accompanying drawings constituting a part of the utility model are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model, and do not constitute improper limitations to the utility model. In the attached picture:

Fig. 1 shows the front schematic diagram of the box-type substation of the underground transformer of an embodiment of the present invention; And

Fig. 2 shows a schematic side view of a box-type substation of an underground transformer according to an embodiment of the present invention.

Detailed ways

The embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings, but the utility model can be implemented in various ways defined and covered by the claims.

Fig. 1 shows a box-type substation of an underground transformer according to an embodiment of the present invention. The box-type substation includes: an underground substation box 4, an underground transformer 1, a prefabricated pit base plate 2, and a light box-type distribution cabinet 3; wherein, the underground transformer 1 is placed in the underground box 4, and the underground box 4 is set in Below the ground, it can be in a basement or a pit; the underground box 4 is covered with a prefabricated pit substrate 2, and a light box type distribution cabinet 3 is arranged on the prefabricated pit substrate 2, and the light box type power distribution cabinet 3 has a louver type ventilation mechanism31. The box-type substation can be pre-assembled into a complete set of equipment in the factory, and its electrical performance is equivalent to that of the traditional box-type substation. The advertising light box is integrated with the louvered ventilation mechanism 31, and advertising pictures are set in the advertising light box, so that each pre-installed underground box-type transformer is like a large-scale TV set, thus forming a beautiful landscape, playing the role of decorating the city, The effect of beautifying the environment.

Referring to FIG. 2 , the box-type substation of the underground transformer also includes an operation cover 21 arranged on the base plate 2 of the prefabricated pit. Opening the operation cover 21 facilitates maintenance of the underground transformer 1 . A low-voltage cable outlet hole 41 and a high-voltage cable inlet hole 42 are provided on the side wall of the underground box for communicating the cable connection between the underground transformer 1 and the power network.

Further, the utility model also has the following preferred embodiments:

(1) Ventilation and heat dissipation of underground transformers

① Temperature rise control of the main body of the underground transformer: The selected underground transformer is a 11 series low-loss product, and a low-temperature rise design is adopted according to the characteristics of the underground transformer to ensure that the temperature rise of the main body of the transformer is at least 10K lower than the national standard.

② Selection of insulation materials for the main coil of underground transformers: the heat resistance grade of the selected coil insulation materials is raised from grade A (temperature resistance 105°C) to grade B (temperature resistance 130°C) or above, and the coil insulation temperature rise ratio Ordinary oil-immersed transformers are increased by 25K, thereby improving the overload capacity of the transformer.

③Underground transformer main heat dissipation method: The heat sink of the oil tank of the underground transformer adopts a flat plate design, which effectively enhances the radiation heat dissipation capability; in addition, the underground transformer with imported naphthenic transformer oil can also be used. Naphthenic transformer oil can flow continuously at extremely low temperature without adding additives, and its good viscosity-time characteristics make the oil flow faster when the temperature rises, ensuring that the product has good heat dissipation capacity.

④ Ventilation design of the pit base plate: In order to make the inside of the pit have good ventilation, an extended pit base plate structure is adopted. Since the box-type substation of the street lamp underground transformer is installed as a whole, the civil engineering only needs to dig a hole according to the drawings and make a concrete installation plane. Between the power distribution cabinet and the pit, and in the advertising light box, ventilation and heat dissipation openings are set up to realize natural ventilation and heat dissipation of the transformer. At the same time, the air inlet and outlet fans are added. When the temperature of the underground transformer (the temperature of the outer wall of the oil pipe on the oil tank) reaches 75 degrees due to long-term overload operation, the fan is activated to force the exhaust air to cool down, so as to ensure the normal operation of the underground transformer.

(2) Waterproofing and drainage of pit substrates and anti-immersion of underground transformers

① The design and installation process of the underground transformer body:

High-voltage cable terminals adopt imported fully sealed and fully insulated EDPM elbow cable plugs or domestic fully sealed and fully insulated LSR silicone rubber prefabricated cable heads; low-voltage cables are wrapped with imported waterproof sealant and covered with imported waterproof heat-shrinkable tubes, The end is placed in a sealed box, which can meet the requirements of long-term underwater operation.

②Design of the underground box:

The underground box can be welded with all steel plates and reinforced channel steel, and the whole is hot-dip galvanized and sprayed with anti-corrosion finish paint; the base plate of the pit adopts a fully sealed reinforced concrete structure cover plate; the base plate and the underground box are sealed with rubber The strips are waterproofed to ensure that surface water, groundwater and other sundries cannot enter the pit.

③Automatic drainage design:

A submersible pump is installed in the underground box and an automatic drainage system is installed. When water enters the pit due to accidents such as rainstorms and floods, the drainage system will be automatically activated for drainage.

(3) Anticorrosion of underground transformer casing

Made of low-alloy structural steel, the anti-corrosion ability of the body is better than that of ordinary carbon structural steel; the treatment process specification meets the treatment requirements for steel and steel pipelines buried in wet soil.

(4) Protection of outdoor light box type distribution cabinet

The power distribution cabinet inside the light box shell adopts a double-layer door structure. The first layer door is a protective door to ensure that unauthorized persons cannot operate the power distribution equipment; the second layer door is an instrument door to ensure safe operation of the power distribution equipment. Safety.

The box-type substation of the underground transformer according to the utility model has the following beneficial effects:

(1) Economic benefits

Compared with most traditional box-type substations in operation, underground transformer box-type substations have three major advantages in economic operation:

1. The transformer with low temperature rise and low loss is adopted. The no-load loss, load loss and other indicators are much better than the S9 series transformers commonly used in traditional box-type substations, and are equivalent to or better than the S11 series transformers, saving energy.

2. The underground transformer has a long maintenance-free cycle, which directly saves maintenance costs.

3. The underground transformer box-type substation occupies a small surface area and has fewer installation restrictions, so it can be installed near the load center, thereby effectively shortening the radius of low-voltage power supply, not only saving a lot of cable investment costs, but also enabling The line loss in the city is greatly reduced.

(2) Social benefits and application prospects

The street lamp underground transformer box-type substation effectively solves the contradiction between the street lamp power supply facilities and the beautiful environment, and can complement the surrounding scenery; the advertising light box can also be placed with public welfare slogans or posters, for social public welfare. Popularity fuels the flames; the use of underground transformer boxes to beautify the environment, while occupying a small area, can better improve the urban environment and enhance the overall image of the city.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (10)

1. A box-type substation of an underground transformer, characterized in that, comprising: The underground box (4) is arranged below the ground; An underground transformer (1), arranged in the underground box (5); The power distribution cabinet (3) is arranged above the underground box (4), connected to the underground box (4), and at least partially above the ground. 2. The box-type substation of an underground transformer according to claim 1, characterized in that, it also includes a prefabricated pit base plate (2) covering the underground box body (4), and the upper surface has a The connection part that cabinet (3) connects. 3. The box-type substation for underground transformers according to claim 2, characterized in that an openable operation cover (21) is provided on the upper surface of the prefabricated pit base (2). 4. The box-type substation of an underground transformer according to claim 1, characterized in that, the power distribution cabinet (3) is provided with a ventilation mechanism, and the ventilation mechanism communicates with the interior of the underground box (4) . 5. The box-type substation for underground transformers according to claim 4, characterized in that the ventilation mechanism is a louver-type ventilation mechanism (31). 6. The box-type substation of an underground transformer according to claim 1, characterized in that the underground box (4) has a low-voltage cable outlet hole (41) and a high-voltage cable inlet hole (42). 7. The box-type substation of an underground transformer according to claim 6, characterized in that a submersible pump is arranged inside the underground box (4). 8. The box-type substation of underground transformer according to claim 1, characterized in that, the casing of the underground transformer (1) is made of low-alloy structural steel. 9. The box-type substation of an underground transformer according to claim 1, characterized in that, the power distribution cabinet (3) has a light box or a display screen. 10. The box-type substation of underground transformer according to claim 2, characterized in that, the underground box (4), the underground transformer (1), the prefabricated pit base plate (2) and the The power distribution cabinet (3) is prefabricated and connected as one.

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