A sinking box for prefabricated cabin type substation in super low temperature area

Abstract

The utility model belongs to prefabricated cabin type substation sinking box technical field especially relates to a sinking box for prefabricated cabin type substation in ultralow temperature area, including sinking box body, sinking box body includes sinking box base, sinking box side plate along sinking box base four around setting, sinking box body is provided with cable fixed clamp, zero sequence mutual inductor and at least one heating plate in. Sinking box body is equipped with heat preservation assembly still, the sinking box base lower surface is fixed with bottom plate, sinking box body top is equipped with fireproof plugging board still. The utility model adopts the steel material with excellent low temperature mechanics performance and structure bearing capacity and the heat preservation material with very low thermal conductivity, provides the heat preservation effect to the cable line in sinking box all -round, realizes the temperature stability in the box, adapts ultralow temperature environment.

Description

Technical Field

[0001] This utility model belongs to the technical field of prefabricated substation sunken boxes, specifically relating to a sunken box for prefabricated substations in ultra-low temperature regions. Background Technology

[0002] With the continuous upgrading of technology in the power industry, the market demand for prefabricated substations is showing a sustained growth trend. Their modular and convenient construction advantages make them widely used in scenarios such as new energy power plants, urban power distribution networks, and power supply in remote areas. However, at the same time, the usage environment of prefabricated modules is becoming increasingly complex, from the extreme cold weather in high-altitude and cold regions to the outdoor environment with drastic temperature differences between day and night, which places higher demands on the thermal insulation performance of prefabricated modules.

[0003] Traditional, single-method thermal insulation is no longer suitable for diverse and demanding working conditions, and cannot meet the market's demand for long-term stable operation of equipment. In the structural composition of existing prefabricated cabin products, steel plays a core role due to its high strength and ease of processing, becoming the main material for key components such as the cabin base, frame, and shell.

[0004] However, ultra-low temperature environments have a significant negative impact on the mechanical properties of steel, causing its key indicators to change in the opposite direction. While the strength and hardness of steel may increase slightly, its plasticity and toughness will decrease sharply, transforming the steel from a state of "deformability and impact resistance" to a fragile state of "brittleness and difficulty in cushioning." This performance degradation can lead to serious safety hazards—when the prefabricated cabin is subjected to external impacts (such as wind and snow loads, equipment vibration, accidental collisions, etc.) in a low-temperature environment, the steel structure may directly undergo brittle fracture, leading to cabin damage, internal electrical equipment failure, and ultimately causing large-scale power outages. This not only affects the normal power supply guarantee but also causes high equipment maintenance costs, economic losses from power outages, and even threatens the safety of surrounding personnel and facilities. Utility Model Content

[0005] In response to the shortcomings of existing technologies, the inventors have developed a prefabricated substation sunken box for ultra-low temperature regions through long-term practical research. It uses steel with excellent low-temperature mechanical properties and structural load-bearing capacity, as well as insulation materials with extremely low thermal conductivity, to provide comprehensive insulation for the cables inside the sunken box, thereby stabilizing the internal temperature and adapting to ultra-low temperature environments.

[0006] This utility model discloses a prefabricated substation sunken box for ultra-low temperature areas, including a sunken box body. The sunken box body includes a sunken box base and sunken box side plates arranged around the sunken box base. The sunken box body is provided with a cable fixing clamp, a zero-sequence current transformer and at least one heating plate.

[0007] The sunken box body is also equipped with a heat insulation component, which includes side insulation cotton that adheres to the inner side of the side panel of the sunken box and bottom insulation cotton that adheres to the upper surface of the base of the sunken box. A base plate is fixed to the lower surface of the base of the sunken box, and a fireproof sealing plate is also provided on the top of the sunken box body.

[0008] The cable clamp is installed on a preset cable path and is fixed to the sunken box body by a cable clamp bracket. The zero-sequence current transformer is disposed on top of the cable clamp and aligned with the cable path, and is fixed to the sunken box body by a zero-sequence current transformer bracket.

[0009] Furthermore, both the base of the sunken box and the side plate of the sunken box are made of Q335MF steel.

[0010] Furthermore, both the side insulation cotton and the bottom insulation cotton are 50mm thick aluminum silicate cotton, with aluminum foil wrapped around the surface of the aluminum silicate cotton.

[0011] Furthermore, both the side insulation cotton and the bottom insulation cotton are fixed to the side plate of the sunken box by several stainless steel insulation nails.

[0012] Furthermore, the base plate is a 6mm thick aluminum plate.

[0013] Furthermore, the recessed box base has several base through holes for the cable to pass through, and the base plate has base plate through holes corresponding to the base through holes, with stainless steel glands installed at the base plate through holes.

[0014] Furthermore, the lower part of the gland is located on the underside of the base plate, and its upper part extends into the recessed box base.

[0015] Furthermore, a low-temperature cold storage sealant is applied to the gap between the sunken box base and the bottom plate, and a weather-resistant silicone rubber sealing strip is attached.

[0016] Furthermore, the fireproof sealing plate is provided with cut holes for cables to pass through.

[0017] Furthermore, the fireproof sealing board is a 50mm thick Hilti fireproof sealing board.

[0018] The beneficial effects of this utility model are:

[0019] 1. The external Q335MF steel material ensures structural stability at ultra-low temperatures, while the internal 50mm thick aluminum silicate cotton (with aluminum foil) fixed by 316 stainless steel insulation nails forms an efficient heat insulation barrier. Combined with the heating plate for active heat replenishment, it achieves stable internal temperature and is suitable for ultra-low temperature environments.

[0020] 2. The bottom is protected by a 6mm aluminum plate and a 316 stainless steel gland, combined with 50mm aluminum silicate cotton insulation wrapped in aluminum foil, cable fixing clamps to prevent stress, zero-sequence current transformer monitoring, and a 50mm fireproof sealing plate on top, to achieve all-round safe operation of cables in the sunken box.

[0021] 3. Apply sealant and install sealing strips at the contact points between the sunken box and the bottom plate of the prefabricated substation enclosure. At the same time, apply sealant to the gaps at the contact points between the sunken box base and the bottom plate. This multi-layered sealing effectively blocks the intrusion of cold air, reduces heat dissipation from the steel, and further consolidates the temperature stability inside the box. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the sunken box of this utility model installed at the bottom of the prefabricated substation.

[0023] Figure 2 This is a structural schematic diagram of the sunken box of this utility model.

[0024] Figure 3 This is a front sectional view of the sunken box of this utility model installed at the bottom of the prefabricated substation enclosure.

[0025] Figure 4 yes Figure 3 A schematic diagram showing the location of the thermal insulation component and fireproof sealing plate of this utility model.

[0026] Figure 5 yes Figure 4 Side view.

[0027] In the attached image:

[0028] 100-Sunken box body, 110-Sunken box base, 111-Bottom plate, 112-Glander head, 113-Bottom insulation cotton, 120-Sunken box side plate, 121-Side insulation cotton, 130-Cable fixing clip, 131-Cable fixing clip bracket, 140-Zero sequence current transformer, 141-Zero sequence current transformer bracket, 150-Heating plate, 160-Fireproof sealing plate, 200-Bottom of the enclosure, 300-Cable. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0030] See Figures 1-5This utility model proposes a sunken box for a prefabricated substation in ultra-low temperature areas, including a sunken box body 100. The sunken box body 100 includes a sunken box base 110 and sunken box side plates 120 arranged around the sunken box base 110. The sunken box body 100 is provided with a cable fixing clamp 130, a zero-sequence current transformer 140, and at least one heating plate 150.

[0031] In this embodiment, both the sunken box base 110 and the sunken box side plate 120 are made of Q335MF steel. This material has excellent low-temperature mechanical properties and structural load-bearing capacity, and can maintain stable resistance to deformation in ultra-low temperature environments, providing reliable support for the overall structure.

[0032] In extreme low-temperature environments, the number of heating plates 150 configured inside the sunken box is calculated based on data. Precise temperature control compensates for potential heat loss, ensuring the box remains within the stable temperature range required for equipment operation and preventing low temperatures from affecting the performance of internal components. In this embodiment, the sunken box body 100 is equipped with two heating plates 150, respectively mounted on the side plates 120 of the sunken box on both sides of the cable clamp 130. The heating plates 150 are fixed to the sunken box body 100 with bolts.

[0033] The recessed box body 100 is also equipped with a thermal insulation component, which includes four side insulation cotton 121s attached to the inner sides of the four recessed box side plates 120 and a bottom insulation cotton 113 attached to the upper surface of the recessed box base 110. In this embodiment, both the side insulation cotton 121 and the bottom insulation cotton 113 are 50mm thick aluminum silicate cotton, with aluminum foil wrapped around the surface of the aluminum silicate cotton. Both the side insulation cotton 121 and the bottom insulation cotton 113 are fixed to the recessed box side plates 120 by several 316 stainless steel insulation nails. The aluminum silicate cotton used in this invention has an extremely low thermal conductivity, which can effectively block the conduction of external low temperature into the box. At the same time, by utilizing the high reflectivity of aluminum foil, the heat loss from the box through radiation can be further reduced, forming a "blocking + reflection" dual thermal insulation barrier.

[0034] A base plate 111, made of 6mm thick aluminum plate, is fixed to the lower surface of the sunken box base 110. The sunken box base 110 has several base through holes for cables to pass through. Correspondingly, the base plate 111 has base plate through holes corresponding to these base through holes. 316 stainless steel glands 112 are installed at the base plate through holes. The glands 112 not only improve the aesthetics of cable routing through standardized interfaces but also form a secondary protective barrier, effectively preventing external dust and small animals from entering the sunken box and avoiding equipment malfunctions caused by foreign objects.

[0035] The lower part of the gland 112 of this utility model is located on the underside of the base plate 111, and its upper part extends into the recessed box base 110. It is covered by aluminum silicate cotton on the recessed box base. Since the aluminum silicate cotton is wrapped with aluminum foil, it can enhance the heat reflection effect. The aluminum silicate cotton further enhances the internal temperature stability of the recessed box due to its low thermal conductivity, preventing the external low temperature from affecting the internal environment of the box through the cable 300 passage, and at the same time preventing the heat inside the box from being lost to the outside.

[0036] The base plate 111 is fixed to the sunken box base 110 with several bolts. Low-temperature cold storage sealant is applied to the gap between the sunken box base 110 and the base plate 111 and weather-resistant silicone rubber sealing strips are pasted to eliminate the risk of air leakage in the gap and reduce the heat loss of the main steel of the sunken box due to low temperature conduction. It provides dual protection of "cold intrusion prevention" and "heat preservation" to ensure the stable temperature inside the box and ensure the long-term reliable operation of the sunken box in ultra-low temperature environment.

[0037] The cable fixing clamp 130 is installed on the preset cable 300 path. The cable fixing clamp 130 is installed in the sunken box body 100 through the cable fixing clamp bracket 131. The cable fixing clamp 130 achieves cable 300 positioning through rigid clamping, effectively avoiding continuous stress caused by the cable 300's own weight or external disturbances, preventing the cable insulation layer from cracking due to long-term stress, and ensuring the cable insulation performance and service life.

[0038] The zero-sequence current transformer 140 is mounted on top of the cable clamp 130 and aligned with the path of the cable 300. The zero-sequence current transformer 140 is fixed inside the recessed box body 100 by a zero-sequence current transformer bracket 141. The zero-sequence current transformer 140 can collect real-time operating data of the cable 300, enabling precise monitoring of key parameters such as cable current. This provides data support for judging equipment operating status and providing early warning of faults, ensuring the safe operation of the cable.

[0039] A fireproof sealing plate 160 is also provided on the top of the sunken box body 100. The fireproof sealing plate 160 is a 50mm thick Hilti fireproof sealing plate. This material not only meets stringent fire protection standards and can effectively block the path of flame spread, but also has good low-temperature sealing properties to prevent cold air from entering the box through the top cable inlet, thus providing both fire protection and heat insulation functions. In this embodiment, the fireproof sealing plate 160 is glued to the top perimeter of the sunken box body 100, and the fireproof sealing plate 160 also has cut holes for the cable 300 to pass through.

[0040] Low-temperature cold storage sealant is applied to the contact area between the top of the sunken box body 100 and the bottom 200 of the prefabricated substation enclosure, and a weather-resistant silicone rubber sealing strip is installed. The low-temperature cold storage sealant maintains good elasticity even in ultra-low temperature environments, and the weather-resistant silicone rubber sealing strip has good low-temperature resistance. It also fills the gaps through physical compression. The combination of the two forms the first line of defense for sealing, blocking the intrusion of cold air into the critical contact area.

[0041] The specific installation process of the sunken box of this utility model is as follows:

[0042] 1. Installation of aluminum silicate cotton on the inner side of the sunken box: 1) First, clean the inner surface of the sunken box; fix the 50m thick aluminum silicate cotton wrapped with aluminum foil to the inner side wall of the sunken box with shipyard welding nails and flat washers. The spacing of the insulation nails should be uniform to ensure that the aluminum silicate cotton is tightly attached to the inner wall without loosening.

[0043] 2. Heating plate installation: Calculate the number of heating plates required, install the heating plates in the designed positions, and mark the cable routing inside the recessed box to avoid positional conflicts between the heating plates and other components.

[0044] 3. Install the zero-sequence current transformer components in the designated position inside the sunken box, ensuring that the current transformer is aligned with the cable path to facilitate subsequent cable passage; then install the cable clamp onto the preset cable path.

[0045] 4. Apply low-temperature cold storage sealant evenly to the contact area between the top of the sunken box and the bottom of the prefabricated substation enclosure, and then attach a weather-resistant silicone rubber sealing strip. The sealing strip must match the contact surface to ensure a tight fit. Use stainless steel bolts to install the sunken box to the bottom of the prefabricated substation enclosure.

[0046] 5. After the sunken box and the bottom of the prefabricated substation enclosure are installed in place and checked to be correct, apply low-temperature cold storage sealant evenly again to the gap between the sunken box base and the bottom plate. The sealant should cover the contact gap to form a multi-layer sealing protection, further reducing cold air penetration and heat loss, and ensuring the sealing performance of the sunken box in ultra-low temperature environment.

[0047] 6. Install Hilti fireproof sealing board on the top of the sunken box. Cut holes in the Hilti fireproof sealing board to make cable holes. To ensure that the fireproof sealing material fits tightly with the cable and the top of the sunken box without gaps, apply fireproof sealant and apply fireproof paint to the cable to meet fire protection requirements.

[0048] 7. The cable passes through the zero-sequence current transformer to transmit signals; the cable passes through the cable clamp to prevent the cable joint from being damaged by stress.

[0049] 8. Fill the gap between the bottom of the sunken box and the aluminum plate, as well as the space around the cable, with the 50mm thick aluminum silicate cotton bundle wrapped with aluminum foil, ensuring that the aluminum silicate cotton bundle is tightly filled without any voids.

[0050] 9. Secure the 6mm thick aluminum plate to the base of the sunken box with bolts. To ensure a tight and seamless fit between the aluminum plate and the bottom of the sunken box, apply a weather-resistant silicone rubber sealing strip and evenly coat the aluminum plate with low-temperature cold storage sealant. Then, install stainless steel 316 gland heads at the perforations in the bottom plate of the aluminum plate. The gland heads must be securely installed, and the angle of the gland heads should be adjusted to ensure that the cables can pass through smoothly, providing secondary protection against dust and small animals.

[0051] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A sunken box for a prefabricated substation in ultra-low temperature regions, comprising a sunken box body (100), characterized in that, The sunken box body (100) includes a sunken box base (110) and sunken box side plates (120) arranged around the sunken box base (110). The sunken box body (100) is provided with a cable fixing clip (130), a zero-sequence current transformer (140) and at least one heating plate (150). The sunken box body (100) is also provided with a heat insulation component, which includes side insulation cotton (121) that is attached to the inner side of the side plate (120) of the sunken box and bottom insulation cotton (113) that is attached to the upper surface of the base (110) of the sunken box. The lower surface of the sunken box base (110) is fixed with a base plate (111), and the top of the sunken box body (100) is also provided with a fireproof sealing plate (160). The cable clamp (130) is installed on the preset cable path and is fixed inside the sunken box body (100) by the cable clamp bracket (131); the zero-sequence current transformer (140) is disposed on the top of the cable clamp (130) and aligned with the cable path, and is fixed inside the sunken box body (100) by the zero-sequence current transformer bracket (141).

2. The sunken box for prefabricated substations in cryogenic regions according to claim 1, characterized in that, The sunken box base (110) and the sunken box side plate (120) are both made of Q335MF steel.

3. The sunken box for prefabricated substations in cryogenic regions according to claim 1, characterized in that, Both the side insulation cotton (121) and the bottom insulation cotton (113) are 50mm thick aluminum silicate cotton, with aluminum foil wrapped around the surface of the aluminum silicate cotton.

4. The sunken box for prefabricated substations in ultra-low temperature regions according to claim 3, characterized in that, Both the side insulation cotton (121) and the bottom insulation cotton (113) are fixed to the side plate (120) of the sunken box by several 316 stainless steel insulation nails.

5. The sunken box for prefabricated substations in cryogenic regions according to claim 1, characterized in that, The base plate (111) is a 6mm thick aluminum plate.

6. The sunken box for prefabricated substations in cryogenic regions according to claim 1, characterized in that, The sunken box base (110) has several base holes for the cable to pass through, and the base plate (111) has base plate holes corresponding to the base holes. The base plate holes are equipped with 316 stainless steel glands (112).

7. The sunken box for prefabricated substations in ultra-low temperature regions according to claim 6, characterized in that, The lower part of the gland (112) is on the underside of the base plate (111), and its upper part extends into the sunken box base (110).

8. The sunken box for prefabricated substations in cryogenic regions according to claim 1, characterized in that, Low-temperature cold storage sealant was applied to the gap between the sunken box base (110) and the bottom plate (111), and a weather-resistant silicone rubber sealing strip was attached.

9. The sunken box for prefabricated substations in ultra-low temperature regions according to claim 1, characterized in that, The fireproof sealing plate (160) is provided with cut holes for cables to pass through.

10. The sunken box for prefabricated substations in cryogenic regions according to claim 9, characterized in that, The fireproof sealing board (160) is a 50mm thick Hilti fireproof sealing board.

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