A device and method for changing the insulating oil of a high-voltage cable oil-type terminal

Abstract

This invention discloses a device and method for replacing insulating oil in high-voltage cable oil-type terminals, relating to the field of high-voltage cable oil-type terminal insulating oil replacement technology. It includes a high-voltage cable terminal comprising a housing and a base fixedly connected to the housing. A high-voltage cable body is disposed inside the housing, passing through the high-voltage cable terminal. A sealing sleeve is disposed between the base and the high-voltage cable body, with the base tightly installing the sealing sleeve between the housing and the base. This device heats the insulating oil body to improve its fluidity, facilitating the natural outflow of the insulating oil body and allowing workers to remove substandard insulating oil. Insulating gas is then injected into the sealed chamber via an inflation pipe to completely expel the substandard insulating oil body. Finally, an oil pump replenishes the high-voltage cable terminal from the outside, enabling safe replacement of deteriorated insulating oil inside the cable oil-type terminal in a short time without power interruption.

Description

Technical Field

[0001] This invention relates to the field of high-voltage cable oil-type terminal insulating oil replacement technology, and in particular to a high-voltage cable oil-type terminal insulating oil replacement device and method. Background Technology

[0002] The high-voltage cable oil-filled terminal is a high-voltage transmission line device, and its interior is filled with high-viscosity insulating oil. This high-viscosity insulating oil will slowly deteriorate after the cable terminal is energized. Factors influencing this deterioration may include external water seepage, impurities introduced during installation, and prolonged high-temperature aging, ultimately leading to oil deterioration and a decrease in insulation performance.

[0003] The insulating oil inside the high-voltage cable oil-type terminal is generally a high-viscosity polyisobutylene viscous liquid with a viscosity of 22,000 cst (40°C), exhibiting very poor fluidity. When the quality of the insulating oil inside the cable terminal deteriorates, it cannot flow out naturally through the hole at the bottom of the cable terminal.

[0004] Conventional cable terminal products do not have a method for replacing insulating oil. Therefore, it is impossible to replace the insulating oil of high-voltage cable oil-type terminals during operation. The only way to replace the insulating oil is to disconnect the power and disassemble the terminal. Since the power outage and disassembly of the terminal cannot be completed in a short time, it has a significant impact on power demand.

[0005] Therefore, there is an urgent need to propose a device and method for replacing the insulating oil in high-voltage cable oil-type terminals. Summary of the Invention

[0006] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0007] In view of the problems existing in the above-mentioned high-voltage cable oil-type terminal insulating oil replacement device, the present invention is proposed.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high-voltage cable oil-type terminal insulating oil replacement device, comprising,

[0009] A high-voltage cable terminal includes a housing and a base fixedly connected to the housing. A high-voltage cable body is disposed inside the housing and the high-voltage cable body passes through the high-voltage cable terminal.

[0010] A sealing sleeve is disposed between the base and the high-voltage cable body. The base tightly installs the sealing sleeve between the housing and the base. The inner side of the sealing sleeve is tightly fitted to the outer side of the high-voltage cable body.

[0011] An insulating oil body is formed between the housing, the sealing sleeve and the high-voltage cable body, and the insulating oil body is contained within the sealing cavity.

[0012] A heating assembly is disposed between the sealing sleeve and the high-voltage cable body.

[0013] As a preferred embodiment of the high-voltage cable oil-type terminal insulating oil replacement device of the present invention, the sealing sleeve includes a fixed base and a surrounding member fixedly connected to one side of the fixed base;

[0014] The fixed base has a protrusion on one side adjacent to the base, and the base has a recess on one side adjacent to the fixed base. The protrusion is nested within the recess. The sealing sleeve is fixed by clamping the protrusion between the housing and the base.

[0015] As a preferred embodiment of the high-voltage cable oil-type terminal insulating oil replacement device of the present invention, the heating component includes a heating ring and a lead wire fixedly connected to the heating ring;

[0016] The lead wire passes through the high-voltage cable terminal, and one end of the lead wire is connected to a control component, which is used to control the opening and closing of the heating ring.

[0017] As a preferred embodiment of the high-voltage cable oil-type terminal insulating oil replacement device of the present invention, the heating assembly further includes a heat insulation component connected to one side of the heating ring and a heat-conducting component connected to the other side of the heating ring.

[0018] The heat insulation component is in contact with the high-voltage cable body, and the heat-conducting component is in contact with the sealing sleeve.

[0019] As a preferred embodiment of the high-voltage cable oil-type terminal insulating oil replacement device of the present invention, wherein: the fixed base is provided with an oil outlet, and the oil outlet is connected to the sealed chamber.

[0020] As a preferred embodiment of the high-voltage cable oil-type terminal insulating oil replacement device of the present invention, a wireless temperature sensor is installed on the housing and a temperature antenna is installed on the base.

[0021] The wireless temperature sensor is an ultra-high frequency passive wireless temperature sensor. The wireless temperature sensor is used to monitor the temperature of the insulating oil body. The temperature antenna is used to receive the signal from the wireless temperature sensor and transmit the signal to the control component. The control component can collect the temperature monitored by the wireless temperature sensor and control the heating component to heat or stop heating based on the temperature data.

[0022] As a preferred embodiment of the high-voltage cable oil-type terminal insulating oil replacement device of the present invention, the high-voltage cable terminal is further provided with an air-filling component.

[0023] The inflation assembly includes an inflation tube located within the sealed chamber. The bottom of the inflation tube is connected to the fixed base, and the fixed base has an inflation port that is connected to the inflation tube.

[0024] In a preferred embodiment of the high-voltage cable oil-type terminal insulating oil replacement device of the present invention, the top of the air-filling pipe is higher than the liquid level of the insulating oil body.

[0025] The beneficial effects of this invention are as follows: This device can heat the insulating oil body to improve its fluidity, making it easier for the insulating oil body to flow out naturally, making it easier for workers to remove inferior insulating oil. Then, insulating gas is injected into the sealed chamber through the air filling pipe to completely expel the inferior insulating oil body. Then, the oil pump is used to replenish the high-voltage cable terminal from the outside, which can safely replace the deteriorated insulating oil inside the cable oil terminal in a short time without power interruption.

[0026] In view of the problems existing in the above-mentioned methods for replacing insulating oil in oil-type terminals of high-voltage cables, this invention is proposed.

[0027] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for replacing the insulating oil of a high-voltage cable oil-type terminal, applied to any of the high-voltage cable oil-type terminal insulating oil replacement devices described above, comprising the following steps:

[0028] S1: The heating component is activated by the control component to heat the insulating oil body inside the high-voltage cable terminal;

[0029] S2: Monitor the temperature of the insulating oil body via a wireless temperature sensor;

[0030] S3: When the temperature of the insulating oil body reaches 100℃, the control component controls the heating component to stop heating;

[0031] S4: The heated insulating oil body is discharged into the container through the oil outlet, and then the insulating gas is filled into the inside of the high-voltage cable terminal through the air filling pipe, so that the heated insulating oil body is completely squeezed out from the bottom of the terminal.

[0032] S5: The heated insulating oil body is injected into the cable terminal through the oil outlet in the reverse direction, while the insulating gas in the bushing is squeezed out of the air filling pipe into the cable terminal, so as to completely replace the insulating oil body.

[0033] As a preferred embodiment of the high-voltage cable oil-type terminal insulating oil replacement method of the present invention, the insulating gas is sulfur tetrafluoride.

[0034] The beneficial effects of this invention are as follows: By heating, the fluidity of the insulating oil is improved. In conjunction with a wireless temperature sensor, the heating component is controlled to heat the insulating oil body in a controllable manner, allowing the insulating oil body to be smoothly discharged from the oil outlet at the bottom of the high-voltage cable terminal. Furthermore, by filling with insulating gas, the deteriorated insulating oil is completely removed from the inside, and the insulating gas can maintain the electrical performance of the high-voltage cable terminal for a short time, enabling live oil extraction from the high-voltage cable oil terminal. Then, by heating and replenishing the oil, the heated insulating oil is injected from the oil outlet, and the gas inside the high-voltage cable terminal is expelled from the gas filling pipe and gas filling port, thereby realizing the oil replacement work of the cable oil terminal. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0037] Figure 2 For the present invention Figure 1 Enlarged view of point A in the image.

[0038] Figure 3 This is a schematic diagram of the heating assembly of the present invention.

[0039] Figure 4 This is a schematic diagram of the inflatable component of the present invention. Detailed Implementation

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0043] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0044] Example 1

[0045] Reference Figures 1-2 This first embodiment of the invention provides a high-voltage cable oil-type terminal insulating oil replacement device, comprising a high-voltage cable terminal 100, which includes a housing 101 and a base 102 fixedly connected to the housing 101. The housing 101 is fixedly installed on the upper side of the base 102 by bolts. A high-voltage cable body 103 is disposed inside the housing 101 and passes through the high-voltage cable terminal 100. A sealing sleeve 104 is disposed between the base 102 and the high-voltage cable body 103. The base 102 tightly installs the sealing sleeve 104 between the housing 101 and the base 102. The inner side of the sealing sleeve 104 is tightly fitted to the outer side of the high-voltage cable body 103. The sealing sleeve 104 is used to ensure the sealing between the high-voltage cable terminal 100 and the high-voltage cable body 103.

[0046] A sealed chamber 106 is formed between the insulating oil body 105, the housing 101, the sealing sleeve 104, and the high-voltage cable body 103. The sealed chamber 106 contains the insulating oil body 105, which is a high-viscosity polyisobutylene viscous liquid. A heating component 200 is disposed between the sealing sleeve 104 and the high-voltage cable body 103. The heating component 200 can heat the insulating oil body 105 to improve its fluidity and facilitate the flow of the insulating oil body 105 out of the high-voltage cable terminal 100.

[0047] The sealing sleeve 104 includes a fixing seat 104a and a surrounding member 104b fixedly connected to one side of the fixing seat 104a. A protrusion 104c is provided on the upper part of the outer periphery of the fixing seat 104a, and a recess 102a is provided on the upper part of the inner side of the base 102. The protrusion 104c is nested in the recess 102a. The shapes of the protrusion 104c and the recess 102a fit each other. By clamping the protrusion 104c between the housing 101 and the base 102, the sealing sleeve 104 is fixed. The inner side of the fixing seat 104a of the sealing sleeve 104 is tightly fitted with the outer side of the high-voltage cable body 103, and the outer side of the fixing seat 104a is tightly fitted with the inner side of the base 102, ensuring the tightness of the inside of the high-voltage cable terminal 100.

[0048] The heating assembly 200 includes a heating ring 201 and a lead wire 202 fixedly connected to the heating ring 201. The lead wire 202 extends out of the high-voltage cable terminal 100. During cable oil-type terminal installation, the heating assembly 200 is fitted onto the high-voltage cable body 103 and fixed inside the sealing sleeve 104. One end of the lead wire 202 is connected to a control assembly 300, which controls the opening and closing of the heating ring 201. The heating assembly 200 also includes a heat insulation component 203 fixedly connected to one side of the heating ring 201 and a heat-conducting component 204 fixedly connected to the other side of the heating ring 201. Both the heating element 203 and the heat-conducting element 204 are arranged in a ring. The heating assembly 200 has three layers, from the inside out: the heat insulation element 203, the heating ring 201, and the heat-conducting ring. The heat insulation element 203 is in contact with the high-voltage cable body 103. The heat insulation element 203 is made of heat-insulating material to prevent the heating ring 201 from affecting the high-voltage cable when it is heated. The heat-conducting element 204 is in contact with the sealing sleeve 104. The heat-conducting element 204 is made of heat-conducting material. The sealing sleeve 104 is also made of heat-conducting aluminum alloy, which can transfer heat to the insulating oil body 105. The viscosity of the insulating oil will decrease as the temperature rises.

[0049] The fixed base 104a is provided with an oil outlet 107, which is connected to the sealed chamber 106. The oil outlet 107 is normally closed and is only opened when oil needs to be taken out or injected. When taking out oil, the insulating oil body 105 is discharged into the container through the connected oil pipe.

[0050] A wireless temperature sensor 301 is fixedly installed inside the housing 101, and a temperature antenna 302 is fixedly installed on the bottom. The wireless temperature sensor 301 is an ultra-high frequency passive wireless temperature sensor. The wireless temperature sensor 301 is used to monitor the temperature of the insulating oil body 105. The temperature antenna 302 is used to receive the signal from the wireless temperature sensor 301 and transmit the signal to the control component 300. The control component 300 can collect the temperature monitored by the wireless temperature sensor 301 and control the heating component 200 to heat or stop heating based on the temperature data.

[0051] In summary, the control component 300 can control the heating ring 201 to supply heat, and conduct heat through the heat-conducting component 204 and the sealing sleeve 104 to heat the insulating oil body 105. The wireless temperature sensor 301 monitors the temperature of the insulating oil body 105 in real time and transmits the monitored temperature data to the control component 300 through the temperature antenna 302. The control component 300 receives the signal with temperature data. When the temperature data reaches 100°C, the viscosity is 645 cst. At this time, the fluidity of the insulating oil body 105 is sufficient for it to flow smoothly out of the oil outlet 107.

[0052] Example 2

[0053] Reference Figures 2-3This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that an inflation assembly 400 is also provided inside the high-voltage cable terminal 100. The inflation assembly 400 includes an inflation pipe 401 located in the sealed chamber 106. The inflation pipe 401 and the high-voltage cable body 103 are arranged side by side. The bottom of the inflation pipe 401 is fixedly connected to the fixing seat 104a. An inflation port 402 is provided on the fixing seat 104a. The inflation port 402 is connected to the inflation pipe 401. When the inflation port 402 is not in use, it is closed to ensure the sealing of the high-voltage cable terminal 100. The top of the inflation pipe 401 is higher than the liquid level of the insulating oil body 105.

[0054] To completely replace the deteriorated insulating oil body 105, it is necessary to use insulating gas to remove it. The insulating gas is sulfur tetrafluoride, which is commonly used in high-voltage cable accessories. Its insulating properties can replace the insulating oil within a short time. Using an air pump connected to the air inlet 402, the gas is filled into the top space of the insulating oil inside the cable oil terminal through the air inlet pipe 401. Through the expansion of the gas, the heated insulating oil is squeezed out from the bottom of the terminal, and the insulating oil body 105 can be completely emptied. At this time, the interior is filled with insulating gas, which will not reduce the electrical performance of the cable oil terminal.

[0055] After all the deteriorated insulating oil has been removed, new insulating oil is injected in reverse into the high-voltage cable terminal 100 through the oil outlet 107. The insulating oil is first heated outside the cable terminal, and then the new insulating oil is injected into the cable terminal from the bottom through the oil pump pipe. At the same time, the air pump is turned off, and the insulating gas inside the high-voltage cable terminal 100 is squeezed out of the cable terminal from the air filling pipe 401 to achieve complete replacement.

[0056] The remaining structure is the same as that in Example 1.

[0057] Example 3

[0058] Reference Figures 1-3 This is the third embodiment of the present invention, which differs from the second embodiment in that: a method for replacing the insulating oil of a high-voltage cable oil-type terminal, applied to any of the high-voltage cable oil-type terminal insulating oil replacement devices described above, includes the following steps:

[0059] S1: The heating component 200 is activated by the control component 300 to heat the insulating oil body 105 inside the high-voltage cable terminal 100;

[0060] S2: Monitor the temperature of the insulating oil body 105 via wireless temperature sensor 301;

[0061] S3: When the temperature of the insulating oil body 105 reaches 100℃, the control component 300 controls the heating component 200 to stop heating;

[0062] S4: The heated insulating oil body 105 is discharged into the container through the oil outlet 107, and then the insulating gas is filled into the inside of the high-voltage cable terminal 100 through the air filling pipe 401, so that the heated insulating oil body 105 is completely squeezed out from the bottom of the terminal.

[0063] S5: The heated insulating oil body 105 is injected into the cable terminal through the oil outlet 107 in reverse, and the insulating gas in the bushing is squeezed out of the cable terminal through the air filling pipe 401, so as to completely replace the insulating oil body 105.

[0064] By using insulating gas to completely expel the insulating oil body 105 from the high-voltage cable terminal 100, and then using insulating oil to completely expel the insulating gas from the high-voltage cable terminal 100, the deteriorated insulating oil inside the cable oil terminal can be safely replaced without power interruption.

[0065] The insulating gas is sulfur tetrafluoride. The gas filling port 402 is connected to the gas filling pipe 401. The insulating gas can be filled into the internal space of the cable terminal by the gas pump. When it is necessary to refill the oil, the insulating gas inside the high-voltage cable terminal 100 can be extracted first to make the inside of the high-voltage cable terminal 100 a vacuum state, which facilitates the subsequent filling of insulating oil.

[0066] In summary, by heating the insulating oil to reduce its viscosity, and then allowing the insulating oil body 105 to flow out naturally through the oil outlet at the bottom of the sealing sleeve 104 of the high-voltage cable terminal 100, and replenishing the terminal with oil from the outside via an oil pump, it is possible to safely replace the deteriorated insulating oil inside the cable oil terminal without power interruption. In addition, by using the control component 300 to collect the temperature of the insulating oil body 105 inside the high-voltage cable terminal 100 and controlling the heating component 200 to set the heating temperature, the temperature of the insulating oil can be monitored and the heating temperature can be controlled during the insulating oil replacement process.

[0067] The remaining structure is the same as that in Example 2.

[0068] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0069] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0070] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A high-voltage cable oil-type terminal insulating oil replacement device, characterized in that: include, A high-voltage cable terminal (100) includes a housing (101) and a base (102) fixedly connected to the housing (101). A high-voltage cable body (103) is disposed inside the housing (101) and the high-voltage cable body (103) passes through the high-voltage cable terminal (100). A sealing sleeve (104) is disposed between the base (102) and the high-voltage cable body (103). The base (102) tightly installs the sealing sleeve (104) between the housing (101) and the base (102). The inner side of the sealing sleeve (104) is tightly fitted to the outer side of the high-voltage cable body (103). The sealing sleeve (104) includes a fixing seat (104a) and a surrounding member (104b) fixedly connected to one side of the fixing seat (104a). An insulating oil body (105) is formed between the housing (101), the sealing sleeve (104) and the high-voltage cable body (103), and the sealing chamber (106) contains the insulating oil body (105). The fixed base (104a) is provided with an oil outlet (107), which is connected to the sealed chamber (106); A heating assembly (200) is disposed between the sealing sleeve (104) and the high-voltage cable body (103); The heating assembly (200) includes a heating ring (201) and a lead wire (202) fixedly connected to the heating ring (201). The lead wire (202) passes through the high-voltage cable terminal (100), and one end of the lead wire (202) is connected to a control component (300). The control component (300) is used to control the opening and closing of the heating ring (201). The heating assembly (200) also includes a heat insulation component (203) connected to one side of the heating ring (201) and a heat conduction component (204) connected to the other side of the heating ring (201). The heat insulation component (203) is in contact with the high-voltage cable body (103), and the heat-conducting component (204) is in contact with the sealing sleeve (104).

2. The high-voltage cable oil-type terminal insulating oil replacement device according to claim 1, characterized in that: A protrusion (104c) is provided on the side of the fixed seat (104a) adjacent to the base (102), and a recess (102a) is provided on the side of the base (102) adjacent to the fixed seat (104a). The protrusion (104c) is nested in the recess (102a). The sealing sleeve (104) is fixed by clamping the protrusion (104c) between the housing (101) and the base (102).

3. The high-voltage cable oil-type terminal insulating oil replacement device according to claim 2, characterized in that: A wireless temperature sensor (301) is installed on the housing (101), and a temperature antenna (302) is installed on the base (102). The wireless temperature sensor (301) is an ultra-high frequency passive wireless temperature sensor. The wireless temperature sensor (301) is used to monitor the temperature of the insulating oil body (105). The temperature antenna (302) is used to receive the signal from the wireless temperature sensor (301) and transmit the signal to the control component (300). The control component (300) can collect the temperature monitored by the wireless temperature sensor (301) and control the heating component (200) to heat or stop heating through the temperature data.

4. The high-voltage cable oil-type terminal insulating oil replacement device according to claim 3, characterized in that: The high-voltage cable terminal (100) is also equipped with an inflation component (400). The inflation assembly (400) includes an inflation tube (401) located in the sealed chamber (106). The bottom of the inflation tube (401) is connected to the fixed base (104a). An inflation port (402) is provided on the fixed base (104a), and the inflation port (402) is connected to the inflation tube (401).

5. The high-voltage cable oil-type terminal insulating oil replacement device according to claim 4, characterized in that: The top of the air inlet pipe (401) is higher than the liquid level of the insulating oil body (105).

6. A method for replacing the insulating oil in a high-voltage cable oil-type terminal, applied to the high-voltage cable oil-type terminal insulating oil replacement device as described in any one of claims 4 to 5, characterized in that: Includes the following steps: S1: The heating assembly (200) is activated by the control assembly (300) to heat the insulating oil body (105) inside the high-voltage cable terminal (100); S2: Monitor the temperature of the insulating oil body (105) via a wireless temperature sensor (301); S3: When the temperature of the insulating oil body (105) reaches 100°C, the control component (300) controls the heating component (200) to stop heating; S4: The heated insulating oil body (105) is discharged into the container through the oil outlet (107), and then the insulating gas is filled into the inside of the high-voltage cable terminal (100) through the air filling pipe (401) to completely squeeze the heated insulating oil body (105) out from the bottom of the terminal. S5: The heated insulating oil body (105) is injected into the cable terminal through the oil outlet (107), and the insulating gas in the bushing is squeezed out from the air filling pipe (401) into the cable terminal to achieve complete replacement of the insulating oil body (105).

7. The method for replacing the insulating oil in a high-voltage cable oil-type terminal according to claim 6, characterized in that: The insulating gas is sulfur tetrafluoride.

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