Outdoor oil-filled cable terminal installation construction equipment under extremely cold conditions

Abstract

The application relates to outdoor oil-filled cable terminal installation construction equipment under extremely cold conditions, which comprises a heating and heat preservation protection box mechanism, the heating and heat preservation protection box mechanism comprises a main cover body, a heating and blowing mechanism and a temperature sensor, the heating and blowing mechanism comprises a heat preservation box, a heating pipe, a communication cylinder and an air inlet fan, an air inlet fan is fixedly connected to the rear side wall in the heat preservation box cavity, a heating pipe is fixedly connected to the front side wall in the heat preservation box cavity, a communication cylinder is fixedly connected to the heat preservation box cavity, the communication cylinder is arranged at the position of the heating pipe and is communicated with the heat preservation box cavity, the heating and blowing mechanism is fixedly connected to the rear side wall of the main cover body, a temperature sensor is fixedly connected to the inner wall of the main cover body, and the temperature sensor is connected with a PLC. The application can realize heating treatment and heat preservation protection on the operating part of the excavator, and can install the cable and the stress cone by combining the high-voltage cable body and the stress control cone butt joint installation device.

Description

Technical Field

[0001] The present invention belongs to the technical field of cable installation, and in particular relates to outdoor oil-filled cable terminal installation and construction equipment under extremely cold conditions. Background Art

[0002] Outdoor oil-filled cable terminals are critical components of high-voltage transmission and transformation lines. In cold weather, numerous high-voltage cable terminal failures have occurred in China, seriously impacting grid safety. To address this issue, the applicants designed an insulation equivalence test device for the main insulation-stress cone interface of oil-filled cable terminals. The authors tested the effect of silicone oil coating on the silicone rubber / XLPE interface at 10°C and -30°C on partial discharge (PD) activity. The failure mechanism was investigated using microscopic observations and electric field simulations. The results showed that at 10°C, silicone oil coating effectively improved the interface compatibility and enhanced the insulation strength of the cable terminals. The partial discharge inception voltage increased by approximately 17.2% and 200% in the absence and presence of scratch defects, respectively, compared to the uncoated state. However, at -30°C, the solidification shrinkage of the silicone oil resulted in the formation of air gaps or the re-exposure of inherent defects, significantly reducing the PD inception voltage to even slightly lower than that in the uncoated state. Electric field simulation results showed that the maximum field strength distortion in extremely cold conditions reached 6.26 kV / mm, exceeding the electrical strength of air and easily inducing discharge breakdown. Experiments show that the laying environment temperature of oil-filled cables is usually ≥0℃. It is very difficult to lay oil-filled cables under extremely cold conditions. (1) At 10℃, the interface coating of silicone oil can effectively improve the compatibility of the cable terminal interface and the field strength distribution at the interface. When the insulation interface is defect-free and has artificial scratch defects, the partial discharge inception voltage increases by 14.7% and 66.7%, respectively. At -30℃, the interface coating of silicone oil group shows a decrease in PDIV, an increase in discharge amplitude and discharge repetition rate, while the control group without silicone oil coating shows no significant changes. This further proves that the low-temperature phase transition of silicone oil is the main reason for the enhanced partial discharge at the silicone rubber / XLPE interface. (2) Silicone oil will undergo significant solidification and shrinkage under extreme cold conditions, causing the inherent defects of the interface to be exposed again; when the temperature rises, the silicone oil melts, which can fill the air gap defects exposed by the solidification and shrinkage of the silicone oil, but it cannot completely recover to the good state before solidification, resulting in latent defects. At the same time, combined with the electric field simulation results, when the silicone oil solidifies under extreme cold conditions, the maximum field strength distortion value reaches 6.48 kV / mm. After melting, the maximum distortion field strength drops to 4.3 kV / mm, but it is still higher than the electrical strength of air, which is prone to failures such as insulation oil degradation or overall failure caused by partial discharge. (3) The physical morphology of silicone oil changes at low temperatures, causing air gap defects or inherent defects to be exposed again at the stress cone-cable insulation interface, which is the main reason for the breakdown failure of outdoor cable oil-filled terminals in winter. For details, see the Chinese Library Classification Number: TM247 Document Code: A Article Number: 1009-9239 (XXXX) XX-0001-07 Song Pengxian et al. "Study on the Failure Mechanism of Outdoor Oil-Filled Cable Terminals under Extreme Cold Environments".

[0003] Currently, outdoor oil-filled cable terminals can be installed using construction equipment in extremely cold conditions. However, a drawback of these installation equipment is that they cannot heat the control area or provide thermal insulation protection for the control area. This causes the silicone oil in the installed oil-filled cable terminals to significantly solidify and shrink in extreme cold. This exposes inherent defects at the interface between the main insulation and the stress cone, distorting the electric field distribution and triggering partial discharge, which can lead to insulation oil degradation or even failure.

[0004] Therefore, the construction of oil-filled cable terminals urgently needs to develop an outdoor oil-filled cable terminal installation equipment that is suitable for extremely cold conditions and can heat and insulate the oil-filled cable terminals and stress cone interfaces at the control point. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned technology and provide an outdoor oil-filled cable terminal installation and construction equipment under extremely cold conditions, which can perform heating treatment and thermal insulation protection on the excavator control part, and combine with the "high-voltage cable body and stress control cone docking installation device" to realize the thermal insulation protection construction of the oil-filled cable terminal and the stress cone interface.

[0006] In order to achieve the above-mentioned objectives, the present invention adopts the following technical solutions: an outdoor oil-filled cable terminal installation and construction equipment under extremely cold conditions, including a heating and insulation protection box mechanism, the heating and insulation protection box mechanism including a main cover body, a heating and blowing mechanism and a temperature sensor, the heating and blowing mechanism including an insulation box, a heating pipe, a connecting tube and an air intake fan, the rear side wall of the insulation box cavity is fixedly connected to the air intake fan, the front side wall of the insulation box cavity is fixedly connected to the heating pipe, and the connecting tube is fixedly connected to the insulation box cavity, the connecting tube is arranged corresponding to the position of the heating pipe and is connected to the inner cavity of the insulation box, the heating and blowing mechanism is fixedly connected to the rear side wall of the main cover body, and the inner wall of the main cover body is fixedly connected to the temperature sensor, and the temperature sensor is connected to the PLC.

[0007] Furthermore, a thermal insulation cotton layer is provided on the inner wall of the thermal insulation box.

[0008] Furthermore, a control plate is bolted inside the connecting tube.

[0009] Furthermore, the inner wall of the main cover is provided with a waterproof layer, a fiber cotton layer and a thermal insulation layer waterproof layer in sequence to form a thermal insulation protection structure.

[0010] Furthermore, a movable cover is pinned to the left side of the upper portion of the main cover body.

[0011] Beneficial effect: Compared with the existing technology, the present invention can be used to install oil-filled cable terminals outdoors under extremely cold conditions, combined with the heating treatment and thermal insulation protection on the control parts of the excavator, and combined with the "high-voltage cable body and stress control cone docking installation device" to install cables and stress cones. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention;

[0013] Figure 2 It is a structural diagram of the bucket vibration head structure;

[0014] Figure 3 It is a structural diagram of the vibrating crushing column structure;

[0015] Figure 4 This is a schematic diagram of the structure of the thermal insulation and heating protection box; (Abstract attached)

[0016] Figure 5 It is a structural diagram of the heating and blowing shell structure;

[0017] Figure 6 It is an electrical logic schematic diagram of the present invention.

[0018] In the figure: 1. Traveling device; 2. Rotating device; 3. Support platform; 4. Fixed steel frame; 5. Limiting frame; 6. Lifting screw; 7. Lifting motor; 8. Stabilizing seat; 9. First electric cylinder; 10. Assembly seat; 11. Movable arm; 12. Control motor; 13. Support arm; 14. Fastening seat; 15. Second electric cylinder; 16. Cold-proof clothing; 17. Bucket vibration head structure; 171. Main bucket body; 172. Drive seat; 173. Support seat; 174. Protective frame; 175. Insulation protection shell; 176. Vibrating crushing column structure; 1761. Crushing motor; 1762. Drive plate ;1763. Assembly shaft;1764. Vibrating arm;1765. Stabilizing head;1766. Crushing main column;18. Insulation and heating protection box structure;181. Main cover;182. Waterproof layer;183. Fiber cotton insulation layer;184. Movable cover;185. Heating and blowing shell structure;1851. Insulation box;1852. Insulation cotton layer;1853. Air inlet fan;1854. Heating pipe;1855. Connecting tube;1856. Control panel;186. Temperature sensor;187. Switch door;188. Control cabinet;189. Internet of Things module;1810. PLC. DETAILED DESCRIPTION

[0019] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention, and the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0020] As shown in the attached drawings, this embodiment provides an installation and construction equipment for outdoor oil-filled cable terminals under extremely cold conditions, including a heating and heat-insulating protective box mechanism, which includes a main cover body, a heating and blowing mechanism and a temperature sensor. The heating and blowing mechanism includes an insulation box, a heating pipe, a connecting tube and an air inlet fan. The air inlet fan is fixedly connected to the rear side wall of the insulation box cavity, the heating pipe is fixedly connected to the front side wall of the insulation box cavity, and the connecting tube is fixedly connected to the insulation box cavity. The connecting tube is arranged corresponding to the position of the heating pipe and is connected to the insulation box cavity. The heating and blowing mechanism is fixed to the rear side wall of the main cover body, and the temperature sensor is fixedly connected to the inner wall of the main cover body. The temperature sensor is connected to the PLC. A heat-insulating cotton layer is provided on the inner wall of the insulation box. A control panel is bolted to the connecting tube. The inner wall of the main cover body is provided with a waterproof layer, a fiber cotton layer and a heat-insulating waterproof layer in sequence, forming a heat-insulating protective structure. A movable cover is pinned to the left side of the upper part of the main cover body.

[0021] The overall structure of this embodiment is described in detail below.

[0022] As attached Figure 1 The device is shown as an installation device for outdoor oil-filled cable terminals in extremely cold conditions. This device is used in conjunction with an excavator. The device is mounted on the excavator's support platform and the "high-voltage cable body and stress control cone docking installation device" (a separate application) is placed in a heating and insulation device.

[0023] The high-voltage cable body and the stress control cone docking installation device include a support platform, an upright column, left and right support blocks, a positioning base, a cable fixing mechanism, a stress cone fixing mechanism and a position adjustment mechanism. The support platform and the upright column are fixedly connected to form a robot base. The left side of the support platform is fixedly connected to a positioning base, and the positioning base is fixedly connected to a stress cone fixing mechanism. The left and right support blocks are vertically fixed on both sides of the support platform. The position adjustment mechanism includes an electric cylinder, a guide column, a movable slide and a cable fixing mechanism. The electric cylinder is fixed to the right support block through a flange, and the linear motion output end of the electric cylinder is fixed to the movable slide. The circular hole of the movable slide is slidably connected to the guide column to form a reciprocating position adjustment mechanism. The two ends of the guide column are respectively supported on the left and right support blocks, and the movable slide is fixed with a cable fixing mechanism.

[0024] See attached for details Figure 1 The excavator includes a walking device 1, a rotating device 2, a support platform 3, a fixed steel frame 4, a limiting frame 5, a lifting screw 6, a lifting motor 7, a stabilizing seat 8, a first electric cylinder 9, an assembly seat 10, a movable arm 11, an adjusting motor 12, a supporting arm 13, a fastening seat 14, a second electric cylinder 15, a cold-proof coat 16, a bucket vibration head structure 17 and a heat preservation and heating protection box structure 18. The upper end of the walking device 1 is bolted with a rotating device 2, and the upper end of the rotating device 2 supports the supporting platform 3 with bolts; the fixed steel frame 4 is bolted to the rear of the upper surface of the supporting platform 3, and the limiting frame 5 is bolted to the left and right sides of the front end of the fixed steel frame 4; the lifting screw 6 is installed on the upper and lower sides of the limiting frame 5 through bearings, and the upper side of the lifting screw 6 is inlaid with the output shaft of the lifting motor 7; the lifting motor 7 is bolted to the upper end of the limiting frame 5; the The stabilizing seat 8 is inserted into the inner side of the limiting frame 5, and the lifting screw 6 is connected to the inner thread of the stabilizing seat 8; the right end of the first electric cylinder 9 is axially connected to the assembly seat 10, and the output shaft of the first electric cylinder 9 is bolted to the movable arm 11; the right end of the assembly seat 10 is bolted with the stabilizing seat 8; the rear end of the movable arm 11 is axially connected to the stabilizing seat 8; the regulating motor 12 is bolted to the left side of the upper end of the movable arm 11; the support arm 13 is axially connected to the left side of the inner side of the movable arm 11, and the upper part of the support arm 13 is connected to the regulating motor 12; the fastening seat 14 is welded to the left side of the upper end of the support arm 13, and the second electric cylinder 15 is axially connected to the rear part of the fastening seat 14; the cold-proof clothing 16 is wrapped on the outer wall of the second electric cylinder 15; the bucket vibration head structure 17 is installed at the left end of the support arm 13; the thermal insulation and heating protection box structure 18 is supported on the upper surface of the support platform 3.

[0025] See Figure 2As shown, the bucket vibration head structure 17 includes a main bucket body 171, a driving seat 172, a support seat 173, a protective frame 174, a thermal insulation protective shell 175 and a vibration crushing column structure 176. The driving seat 172 and the support seat 173 are welded on the upper and lower sides of the right end of the main bucket body 171; the protective frame 174 is welded to the outer side of the lower end of the main bucket body 171; the thermal insulation protective shell 175 is welded to the left side inside the main bucket body 171, and the vibration crushing column structure 176 is supported in the thermal insulation protective shell 175.

[0026] As attached Figure 3 As shown, the vibrating crushing column structure 176 includes a crushing motor 1761, a drive plate 1762, an assembly shaft 1763, a vibrating arm 1764, a stabilizing head 1765, and a crushing column 1766. The drive plate 1762 is embedded in the output shaft of the crushing motor 1761; the crushing motor 1761 rotates in conjunction with the drive plate 1762; the assembly shaft 1763 is bolted between the drive plates 1762; the upper ends of the vibrating arms 1764 are axially connected to the drive plates 1762, while the stabilizing head 1765 is axially connected to the lower end of the vibrating arms 1764; the vibrating arms 1764, stabilizing head 1765, and crushing column 1766 move to impact and crush the ground, thereby assisting in excavation; the crushing column 1766 is welded to the lower end of the stabilizing head 1765. The drive base 172 and support base 173 at the right end of the main bucket 171 are both axially connected to the output shaft of the second electric cylinder 15 and the left side of the support arm 13. The lower left side of the thermal insulation protective shell 175 is provided with multiple square holes, while the upper right side of the shell is provided with a cavity, which is connected to the multiple square holes. A crushing motor 1761 is bolted to the rear of the upper right side of the thermal insulation protective shell 175. An assembly shaft 1763 is embedded in the output shaft of the crushing motor 1761. The assembly shaft 1763 is mounted on the front of the upper right side of the thermal insulation protective shell 175 via a bearing. Multiple drive plates 1762 are provided, and each is interconnected via the assembly shaft 1763.

[0027] The lower part of the crushing main column 1766 is set to be conical, and the stabilizing head 1765 at the upper end of the crushing main column 1766 is adapted to the lower side of the inner part of the thermal insulation protective shell 175.

[0028] As attached Figure 4As shown, the heat preservation and heating protection box structure 18 includes a main cover body 181, a waterproof layer 182, a fiber cotton heat preservation layer 183, a movable cover 184, a heating and blowing shell structure 185, a temperature sensor 186, a switch door 187, a control cabinet 188, an Internet of Things module 189 and a PLC 1810. The inner wall of the main cover body 181 is inlaid with a waterproof layer 182, and the fiber cotton heat preservation layer 183 is filled between the waterproof layers 182; the movable cover 184 is axially connected to the upper left side of the main cover body 181; the heating and blowing shell structure 185 is installed at the right end of the main cover body 181; the temperature sensor 186 detects the ambient temperature of the main cover body 181 and cooperates with the The Internet of Things module 189 and PLC1810 transmit to the connected PC end; the temperature sensor 186 is bolted to the upper right part of the inner wall of the main cover body 181; the control cabinet 188 is bolted to the front surface of the switch door 187, and the Internet of Things module 189 and PLC1810 are screwed inside the control cabinet 188 respectively; the Internet of Things module 189 and PLC1810 cooperate to make the walking device 1 and the rotating device 2 work so as to move and turn, and then cooperate with the lifting motor 7, the first electric cylinder 9 and the second electric cylinder 15 at different positions to realize the movement of the support arm 13 and the main bucket body 171 and the subsequent excavation of the foundation.

[0029] As attached Figure 5 As shown, the heating and blowing shell structure 185 includes an insulation box 1851, an insulation cotton layer 1852, an air intake fan 1853, a heating pipe 1854, a connecting tube 1855 and a control panel 1856. The insulation cotton layer 1852 is glued to the inner wall of the insulation box 1851; the air intake fan 1853 is embedded in the middle part of the rear side of the insulation box 1851; the heating pipe 1854 is bolted to the upper and lower parts of the left side of the insulation box 1851; the air intake fan 1853 and the heating pipe 1854 generate hot air when working; the connecting tube 1855 is welded to the upper and lower parts of the left side of the insulation box 1851, and the control panel 1856 is bolted inside the connecting tube 1855; the hot air enters the main cover body 181 through the connecting tube 1855 to perform heating and protection treatment on the centralized control part.

[0030] The main cover body 181 is bolted to the outside of the upper surface of the support platform 3 , and the fiber cotton insulation layer 183 inside the main cover body 181 is wrapped by the waterproof layer 182 .

[0031] The switch door 187 is hingedly installed on the lower right side of the rear interior of the main cover 181, and the switch door 187 supports the control cabinet 188, the Internet of Things module 189 and the PLC1810.

[0032] The heat preservation box 1851 is bolted to the right end of the main cover 181 , and the connecting tube 1855 inside the heat preservation box 1851 is inserted into the right side inside the main cover 181 .

[0033] The left end of the heating tube 1854 corresponds to the connecting tube 1855 , and the connecting tube 1855 has a control panel 1856 movably supported inside.

[0034] The lifting motor 7 adopts a motor of type M2IK90N-C.

[0035] The first electric cylinder 9 is a DI65-S250-T-R16-M1-C1-P1 electric cylinder.

[0036] The regulating motor 12 adopts a motor of type M2IK90N-C.

[0037] The second electric cylinder 15 is a DI65-S250-T-R16-M1-C1-P1 electric cylinder.

[0038] Crushing motor 1761 adopts model M2IK90N-C motor.

[0039] The temperature sensor 186 is a WD type temperature sensor.

[0040] The Internet of Things module 189 uses the SKW92A Internet of Things module.

[0041] PLC1810 uses PLC model FX2N-48.

[0042] The air inlet fan 1853 adopts the model YNHY2.8A-5.5KW.

[0043] The heating tube 1854 adopts the model SBT-SR001 heating tube.

[0044] See attached for details Figure 6 The walking device 1 is electrically connected to PLC1810, the rotating device 2 is electrically connected to PLC1810, the lifting motor 7 is electrically connected to PLC1810, the first electric cylinder 9 is electrically connected to PLC1810, the control motor 12 is electrically connected to PLC1810, the second electric cylinder 15 is electrically connected to PLC1810, the crushing motor 1761 is electrically connected to PLC1810, the temperature sensor 186 is electrically connected to PLC1810, the Internet of Things module 189 is electrically connected to PLC1810, the air intake fan 1853 is electrically connected to PLC1810, and the heating pipe 1854 is electrically connected to PLC1810.

[0045] How it works

[0046] During the docking and installation process, outdoor oil-filled cable terminals and stress cones are placed in an insulated and heated protective box to keep their temperature always above ≥0°C. They are then installed in conjunction with the "High-voltage Cable Stress Control Cone Construction Equipment" (separate application) to ensure that the silicone oil in the oil-filled cable terminals does not undergo obvious solidification and shrinkage, thereby avoiding faults such as insulation oil deterioration or overall failure caused by partial discharge.

[0047] The present invention cooperates with the Internet of Things module 189 and the PLC1810 to make the walking device 1 and the rotating device 2 work so as to move and turn, and then cooperates with the lifting motor 7, the first electric cylinder 9 and the second electric cylinder 15 at different positions to realize the movement of the support arm 13 and the main bucket body 171 and then excavate the foundation, which is convenient for the construction and installation of outdoor oil-filled cable terminals. During the excavation process, when the ground is hard and needs to be broken, the crushing motor 1761 works to cooperate with the drive disk 1762 to rotate, and then drives the vibration arm 1764, the stabilizing head 1765 and the crushing main column 1766 to move and impact and crush the ground and assist in the excavation work. During use, when the temperature sensor 186 detects that the temperature around the main cover body 181 is too low, the air intake fan 1853 and the heating pipe 1854 work to generate hot air, and then the hot air enters the main cover body 181 through the connecting tube 1855 to perform heating and protection treatment on the centralized control part.

[0048] The above-mentioned reference embodiment provides a detailed description of an outdoor oil-filled cable terminal installation and construction equipment under extremely cold conditions. It is illustrative rather than restrictive, and several embodiments can be listed according to the limited scope. Therefore, changes and modifications without departing from the overall concept of the present invention should fall within the scope of protection of the present invention.

Claims

1. An outdoor oil-filled cable terminal installation and construction equipment for use in extreme cold conditions, characterized by: The invention comprises an excavator and a heating and heat-insulating protection box mechanism installed on a supporting platform of the excavator, wherein the heating and heat-insulating protection box mechanism comprises a main cover body, a heating and blowing mechanism and a temperature sensor, wherein the heating and blowing mechanism comprises an insulation box, a heating pipe, a connecting tube and an air inlet fan, the rear side wall of the insulation box cavity is fixedly connected with the air inlet fan, the front side wall of the insulation box cavity is fixedly connected with the heating pipe, the connecting tube is fixedly connected to the insulation box cavity, the connecting tube is arranged corresponding to the position of the heating pipe and is connected with the inner cavity of the insulation box, the heating and blowing mechanism is fixedly connected to the rear side wall of the main cover body, the inner wall of the main cover body is fixedly connected with the temperature sensor, and the temperature sensor The sensor is connected to the PLC to form a temperature control system for outdoor oil-filled cable terminals under extremely cold conditions. The oil-filled cable terminals and stress cone interfaces at the control point are heated and insulated to ensure that the silicone oil in the oil-filled cable terminals does not undergo obvious solidification and shrinkage, thereby avoiding deterioration of the insulating oil or overall failure caused by partial discharge. A thermal insulation cotton layer is provided on the inner wall of the insulation box; a control panel is installed with bolts in the connecting cylinder; a waterproof layer, a fiber cotton layer and a thermal insulation waterproof layer are provided on the inner wall of the main cover in sequence to form a thermal insulation protection structure; a movable cover is pinned to the left side of the upper part of the main cover.

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