Cable incoming structure of box transformer

Abstract

The utility model discloses a kind of cable incoming line structures of box transformer, including caisson type incoming line device, caisson type incoming line device includes caisson and three sets of cable fixing device, caisson includes the top plate of rectangle and the box body of upper end open, the top of box body is fixed on top plate, the middle part of top plate includes the rectangular hole with the shape and size of box body upper mouth, the bottom plate of box body includes three incoming line holes, three sets of cable fixing device are respectively fixed above corresponding incoming line hole;The base includes upper plate and lower plate, upper plate and lower plate respectively include the through hole corresponding to caisson type incoming line device;The top plate of caisson type incoming line device is detachably fixed on lower plate, and the caisson of caisson type incoming line device is located below base.The utility model uses caisson type incoming line device to increase the high-voltage electrical clearance between high-voltage cable connection terminal and box transformer bottom, overcome the insufficient distance between high-voltage cable connection terminal and box transformer bottom, the problem of high-voltage discharge appears, improve the safety of product.

Description

Technical Field

[0001] This utility model relates to a prefabricated substation, and more particularly to a cable inlet structure for a prefabricated substation. Background Technology

[0002] A prefabricated substation is a complete set of equipment that integrates high-voltage power distribution equipment, transformers, and low-voltage power distribution equipment into a closed metal enclosure. It features a compact structure, convenient installation, and small footprint, and is widely used in urban power distribution networks, industrial and mining enterprises, residential communities, and other locations.

[0003] With the rapid development of the social economy, electricity load is growing rapidly, and related complete sets of power products are ushering in a peak of development. Users have put forward higher requirements for the safety, reliability and delivery cycle of projects to meet the needs of rapid development.

[0004] The utility model with patent number 202323159810.5 discloses a cable inlet structure for a box-type substation, including a base, a box body fixed on the top of the base, and further including: multiple through holes disposed on the top of the base; a cover plate covering the top of the through holes; two support plates fixed inside the base; multiple movable boxes slidably disposed between the two support plates; and multiple guide structures disposed inside the movable boxes for stabilizing the cable inlet.

[0005] The voltage level on the high-voltage side of the transformer substation is very high, requiring a large electrical clearance. At this time, the high-voltage side cable cannot be subjected to cable stress. If the high-voltage cable connection terminal is not close enough to the bottom of the transformer substation, the high voltage will discharge to the bottom plate of the enclosure, posing a significant safety hazard to the transformer substation. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a cable inlet structure for a transformer substation that can prevent high-voltage cable connection terminals from discharging to the bottom plate of the enclosure and improve the safety performance of the transformer substation.

[0007] To solve the above-mentioned technical problems, the present invention adopts a cable inlet structure for a prefabricated substation, including a recessed cable inlet device. The prefabricated substation includes a cabinet, which includes a base. The recessed cable inlet device includes a recessed box and three sets of cable fixing devices. The recessed box includes a rectangular top plate and an open-top box body. The top of the box body is fixed to the top plate, and the middle of the top plate includes a rectangular hole with a shape and size equivalent to the top opening of the box body. The bottom plate of the box body includes three cable inlet holes, and the three sets of cable fixing devices are respectively fixed above the corresponding cable inlet holes. The base includes an upper plate and a lower plate, and the upper plate and the lower plate respectively include through holes corresponding to the recessed cable inlet device. The top plate of the recessed cable inlet device is detachably fixed to the lower plate, and the recessed box of the recessed cable inlet device is located below the base.

[0008] The cable entry structure of the above-described box-type substation includes a cable fixing device comprising a tower ring, a cable clamp, and a clamp bracket. The large end of the tower ring is fixed to the bottom plate of the box, and the small end of the tower ring faces upward or downward. The cable clamp is fixed to the bottom plate of the box through the clamp bracket.

[0009] The cable inlet structure of the prefabricated substation described above includes a rectangular box frame and a base plate, the base plate being detachably fixed to the bottom of the box frame; the base plate includes two half-plates joined together along the central axis, and the three cable inlet holes are arranged separately along the central axis; the outer periphery of the large end of the tower ring includes an annular groove, and the inner edge of the cable inlet hole of the base plate is embedded in the annular groove of the tower ring, fixing the tower ring to the base plate; the clamp bracket includes a vertical plate, the clamp bracket is arranged on one side of the corresponding cable inlet hole along the central axis, and the lower end of the vertical plate is detachably fixed to the base plate; the cable clamp is fixed to the side of the vertical plate facing the corresponding cable inlet hole by two bolts.

[0010] The cable inlet structure of the prefabricated substation described above includes an outer flange at the top of the enclosure frame and an inner folded edge at the bottom of the enclosure frame; the outer flange at the top of the enclosure frame is screwed to the top plate; the bottom plate is supported by the inner folded edge at the bottom of the enclosure frame and screwed to the inner folded edge.

[0011] In the cable inlet structure of the above-described box-type substation, the rectangular through hole in the upper plate is larger than that in the top plate, and the rectangular through hole in the lower plate is smaller than that in the top plate; the top plate is arranged above the lower plate and is supported by the lower plate.

[0012] In the cable inlet structure of the prefabricated substation described above, the vertical distance between the upper plate and the lower plate is greater than or equal to the height of the caisson. When the prefabricated substation is in transport mode, the caisson-type cable inlet device is inverted. The top plate is arranged above the lower plate, supported by the lower plate, and detachably connected to the lower plate.

[0013] This utility model utilizes a recessed inlet device to increase the high-voltage electrical clearance between the high-voltage cable connection terminal and the bottom of the transformer substation, overcoming the problem of high-voltage discharge due to insufficient distance between the high-voltage cable connection terminal and the bottom of the transformer substation, and improving product safety. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a perspective view of the transformer substation according to an embodiment of this utility model.

[0016] Figure 2 This is a top view of the transformer substation according to an embodiment of this utility model.

[0017] Figure 3 yes Figure 2 AA section view in the image.

[0018] Figure 4 This is a cross-sectional view of the transformer substation in the shipping and transportation state according to an embodiment of this utility model.

[0019] Figure 5 This is a perspective view of the transformer substation base according to an embodiment of this utility model.

[0020] Figure 6 This is the front view of the sunken cable inlet device of this utility model.

[0021] Figure 7 This is a top view of the sunken cable inlet device of this utility model.

[0022] Figure 8 This is a side view of the sunken cable inlet device of this utility model.

[0023] Figure 9 This is a bottom view of the sunken cable inlet device of this utility model.

[0024] Figure 10 yes Figure 7 DD section view in the image.

[0025] Figure 11 yes Figure 6 BB section view in the middle.

[0026] Figure 12 yes Figure 6 CC section view in the image.

[0027] Figure 13 This is an exploded view of the sunken cable inlet device of this utility model.

[0028] Figure 14 This is a perspective view of the sunken cable inlet device of this utility model.

[0029] Figure 15 This is a perspective view of the caisson-type cable entry device under transportation conditions. Detailed Implementation

[0030] The cable inlet structure of the transformer substation in this embodiment of the utility model is as follows: Figures 1 to 15 As shown. Includes a recessed incoming line device 200. The transformer substation includes a cabinet 100, which includes a base 10. The recessed incoming line device 200 includes a recessed box 20 and three sets of cable fixing devices 30.

[0031] The caisson 20 includes a rectangular top plate 21 and an open-top box body 20A. The top of the box body 20A is fixed to the top plate 21. The top plate 21 has a rectangular hole 211 in the middle, with a shape and size similar to the top opening of the box body 20A. The bottom plate 23 of the box body 20A includes three cable inlet holes 231, and three sets of cable fixing devices 30 are respectively fixed above the corresponding cable inlet holes 231. The base 10 includes an upper plate 11 and a lower plate 12, each including a through hole corresponding to the caisson 20-type cable inlet device 200. The top plate 21 of the caisson 20-type cable inlet device 200 is detachably fixed to the lower plate 12, and the main body of the caisson 20 of the caisson 20-type cable inlet device 200 is located below the base 10.

[0032] The cable fixing device 30 includes a tower-shaped ring 31, a cable clamp 32, and a clamp bracket 33. The large end of the tower-shaped ring 31 is fixed to the bottom plate 23 of the enclosure 20A, and the small end of the tower-shaped ring 31 faces upward or downward. The cable clamp 32 is fixed to the bottom plate 23 of the enclosure 20A by the clamp bracket 33.

[0033] The enclosure 20A includes a rectangular enclosure frame 22 and a base plate 23, which is detachably fixed to the bottom of the enclosure frame 22 by screws. The base plate 23 includes two half-plates 23A joined together along its central axis, with three cable inlets 231 arranged separately along the central axis. The outer periphery of the large end of the tower ring 31 has an annular groove 311, and the inner edge of the cable inlet 231 of the base plate 23 is embedded in the annular groove 311 of the tower ring 31, fixing the tower ring 31 to the base plate 23. The groove-shaped clamp bracket 33 includes a vertical plate 331, which is arranged on one side of the corresponding tower ring 31 (corresponding cable inlet 231) along the central axis and is orthogonal to the central axis. The lower end of the vertical plate 331 is detachably fixed to the base plate 23 by screws. The cable clamp 32 is fixed to the side of the upright plate 331 facing the tower ring 31 (corresponding inlet hole 231) by two bolts 332.

[0034] The top of the housing frame 22 includes an outer flange 221, and the bottom of the housing frame 22 includes an inner flange 222. The outer flange 221 at the top of the housing frame 22 is screwed to the top plate 21. The bottom plate 23 is supported by the inner flange 222 at the bottom of the housing frame 22 and is screwed to the inner flange 222.

[0035] The size of the rectangular through hole in the upper plate 11 is larger than the size of the top plate 21, and the size of the rectangular through hole in the lower plate 12 is smaller than the size of the top plate 21. The top plate 21 is arranged above the lower plate 12 and is supported by the lower plate 12.

[0036] The vertical distance between the upper plate 11 and the lower bottom plate 23 is greater than or equal to the height of the caisson 20, such as Figure 4As shown, for ease of transportation, the substation is shipped with the sunken box 20 type incoming line device 200 inverted. The top plate 21 is arranged above the lower plate 12, supported by the lower plate 12, and detachably connected to the lower plate 12.

[0037] The base plate 23 is made of stainless steel to prevent eddy currents from forming around the single-core cable. The tower-shaped ring 31 is secured to the stainless steel base plate 23, preventing external dust from entering the transformer substation and reducing cable friction. The cable clamp 32 restricts cable movement, effectively securing the cable and eliminating mechanical stress caused by cable bending. Long stainless steel bolts 332 are installed on the clamp bracket 33 to accommodate different cable specifications. The clamp bracket 33 and the stainless steel base plate 23 are fixed together using rivet nuts and screws; the single-sided screw operation is simple and convenient.

[0038] The function of the tower ring 31 is to: 1) allow the cable to enter through the inlet hole at the bottom of the cabinet and block the inlet hole to prevent foreign objects from entering the cabinet through the inlet hole; 2) protect the cable insulation layer to prevent the cable from being scratched.

[0039] The tower-shaped ring 31 is made of PVC rubber. The smaller end of the tower-shaped ring 31 can face upwards or downwards. Users can directly cut the smaller end of the sealing ring on-site with a utility knife, creating an opening in the tower-shaped ring 31 according to the size of the cable. This utility model has the following beneficial effects: This utility model utilizes a recessed inlet device to increase the high-voltage electrical clearance between the high-voltage cable connection terminals and the transformer base, enabling rapid and efficient fixing of the incoming cable. It meets the national standard stipulated in the "Eighteen Major Accident Prevention Measures of the State Grid" that the distance between the cable connection terminals and the bottom of the switchgear should be no less than 700mm, overcoming the problem of insufficient distance between the high-voltage cable connection terminals and the bottom of the transformer, leading to high-voltage discharge to all sides, and improving the safety performance and service life of the transformer.

Claims

1. A cable inlet structure for a prefabricated substation, wherein the prefabricated substation includes a cabinet, and the cabinet includes a base, characterized in that, The device includes a caisson-type cable entry device, which comprises a caisson and three sets of cable fixing devices. The caisson includes a rectangular top plate and an open-top box body. The top of the box body is fixed to the top plate, and the middle of the top plate includes a rectangular hole with a shape and size equivalent to the top opening of the box body. The bottom plate of the box body includes three cable entry holes, and the three sets of cable fixing devices are respectively fixed above the corresponding cable entry holes. The base includes an upper plate and a lower plate, and the upper plate and the lower plate respectively include through holes corresponding to the caisson-type cable entry device. The top plate of the caisson-type cable entry device is detachably fixed to the lower plate, and the caisson of the caisson-type cable entry device is located below the base.

2. The cable inlet structure of the transformer substation according to claim 1, characterized in that, The cable fixing device includes a tower ring, a cable clamp, and a clamp bracket. The large end of the tower ring is fixed to the bottom plate of the enclosure, and the small end of the tower ring faces upward or downward. The cable clamp is fixed to the bottom plate of the enclosure through the clamp bracket.

3. The cable inlet structure of the transformer substation according to claim 1, characterized in that, The enclosure includes a rectangular frame and a base plate, the base plate being detachably fixed to the bottom of the frame; the base plate includes two half-plates joined together along its central axis, and the three cable inlets are arranged separately along the central axis; the outer periphery of the large end of the tower ring includes an annular groove, and the inner edge of the cable inlet of the base plate is embedded in the annular groove of the tower ring, fixing the tower ring to the base plate; the clamp bracket includes a vertical plate, the clamp bracket being arranged on one side of the corresponding cable inlet along the central axis, and the lower end of the vertical plate being detachably fixed to the base plate; the cable clamp is fixed to the side of the vertical plate facing the corresponding cable inlet by two bolts.

4. The cable inlet structure of the transformer substation according to claim 3, characterized in that, The top of the box frame includes an outer flange, and the bottom of the box frame includes an inner folded edge; the outer flange at the top of the box frame is screwed to the top plate; the bottom plate is supported by the inner folded edge at the bottom of the box frame and is screwed to the inner folded edge.

5. The cable inlet structure of the transformer substation according to claim 1, characterized in that, The rectangular through-hole in the upper plate is larger than that in the top plate, and the rectangular through-hole in the lower plate is smaller than that in the top plate; the top plate is arranged above the lower plate and is supported by the lower plate.

6. The cable inlet structure of the transformer substation according to claim 5, characterized in that, The vertical distance between the upper plate and the lower plate is greater than or equal to the height of the caisson. When the transformer is in transport, the caisson-type cable inlet device is inverted. The top plate is arranged above the lower plate, supported by the lower plate, and detachably connected to the lower plate.

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