Device and method for replacing insulating oil of oil type terminal of high-voltage cable

Abstract

The invention discloses a high-voltage cable oil type terminal insulating oil replacement device and method, and relates to the technical field of high-voltage cable oil type terminal insulating oil replacement, the high-voltage cable oil type terminal insulating oil replacement device comprises a high-voltage cable terminal, the high-voltage cable terminal comprises a shell and a base fixedly connected with the shell, and a high-voltage cable body is arranged in the shell; the high-voltage cable body penetrates through the high-voltage cable terminal; the sealing sleeve is arranged between the base and the high-voltage cable body, the sealing sleeve is tightly installed between the shell and the base through the base, the insulating oil body can be heated through the device, the fluidity of the insulating oil body can be improved, the insulating oil body can flow out naturally conveniently, and workers can take out inferior insulating oil conveniently; according to the high-voltage cable oil-type terminal, the sealing cavity is filled with the insulating gas through the gas filling pipe, the poor-quality insulating oil body is completely discharged, oil is supplemented to the high-voltage cable terminal from the outside through the oil pump, and the degraded insulating oil in the cable oil-type terminal can be safely replaced in a short time under the condition that power is not cut off.

Description

Technical Field

[0001] The invention relates to the technical field of replacing insulating oil in a high-voltage cable oil-type terminal, and in particular to a device and method for replacing insulating oil in a high-voltage cable oil-type terminal. Background Art

[0002] The high-voltage cable oil terminal is a high-voltage power transmission line device, which is filled with high-viscosity insulating oil. The high-viscosity insulating oil will slowly deteriorate after the cable terminal is energized. Its influencing factors may be external water seepage, impurities brought in during installation, long-term high-temperature aging, etc., which ultimately lead to the deterioration of the insulating oil and the decline of insulation performance.

[0003] The insulating oil inside the high-voltage cable oil terminal generally uses high-viscosity polyisobutylene viscous liquid, which has a viscosity of 22000cst (40°C) and poor fluidity. When 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 insulating oil can only be replaced by dismantling the terminal during power outage. Since power outage and dismantling of the terminal cannot be completed in a short time, this has a great impact on electricity demand.

[0005] Therefore, it is urgent to propose a device and method for replacing insulating oil in a high-voltage cable oil-type terminal. Summary of the invention

[0006] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

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

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a high-voltage cable oil terminal insulating oil replacement device, comprising:

[0009] A high-voltage cable terminal, comprising a housing and a base fixedly connected to the housing, wherein a high-voltage cable body is arranged inside the housing, and the high-voltage cable body passes through the high-voltage cable terminal;

[0010] A sealing sleeve is arranged between the base and the high-voltage cable body, the base tightly installs the sealing sleeve between the shell and the base, and the inner side of the sealing sleeve is tightly fitted with the outer side of the high-voltage cable body;

[0011] Insulating oil body, a sealed chamber is formed between the housing, the sealing sleeve and the high-voltage cable body, and the insulating oil body is contained in the sealed chamber;

[0012] The heating component is arranged between the sealing sleeve and the high-voltage cable body.

[0013] As a preferred solution of the high-voltage cable oil terminal insulating oil replacement device of the present invention, wherein: the sealing sleeve comprises a fixing seat and a surrounding member fixedly connected to one side of the fixing seat;

[0014] A protrusion is arranged on one side of the fixing seat adjacent to the base, and a depression is arranged on one side of the base adjacent to the fixing seat. The protrusion is nested and connected in the depression, and the sealing sleeve is fixed by clamping the protrusion between the shell and the base.

[0015] As a preferred solution of the insulating oil replacement device for high-voltage cable oil-type terminals of the present invention, wherein: the heating assembly comprises a heating ring, 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 solution of the insulating oil replacement device for the oil-type terminal of the high-voltage cable of the present invention, wherein: the heating assembly further comprises a heat insulating member connected to one side of the heating ring, and a heat conducting member connected to the other side of the heating ring;

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

[0019] As a preferred solution of the insulating oil replacement device for the oil-type terminal of a high-voltage cable of the present invention, an oil outlet is provided on the fixing seat, and the oil outlet is communicated with the sealing chamber.

[0020] As a preferred solution of the high-voltage cable oil terminal insulating oil replacement device of the present invention, wherein: a wireless temperature measuring sensor is installed on the housing, and a temperature measuring antenna is installed on the base;

[0021] The wireless temperature sensor adopts a UHF passive wireless temperature sensor, and the wireless temperature sensor is used to monitor the temperature of the insulating oil body. The temperature measuring antenna is used to receive the signal of 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 through the temperature data.

[0022] As a preferred solution of the insulating oil replacement device for the oil-type terminal of the high-voltage cable of the present invention, wherein: the high-voltage cable terminal is also provided with an inflatable component;

[0023] The inflation component comprises an inflation tube located in the sealed chamber, the bottom of the inflation tube is connected to the fixing seat, the fixing seat is provided with an inflation port, and the inflation port is communicated with the inflation tube.

[0024] As a preferred solution of the insulating oil replacement device for the high-voltage cable oil-type terminal of the present invention, the top of the inflation tube is higher than the liquid level of the insulating oil body.

[0025] The beneficial effects of the present invention are as follows: the insulating oil body can be heated by the device to improve its fluidity, which is convenient for the insulating oil body to flow out naturally, and for the staff to take out the inferior insulating oil. Then, the insulating gas is filled into the sealed chamber by using the inflation pipe to completely discharge the inferior insulating oil body. Then, the oil is replenished from the outside to the high-voltage cable terminal by the oil pump, so that the deteriorated insulating oil inside the cable oil terminal can be safely replaced in a short time without power outage.

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

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

[0028] S1: Start the heating component through 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 through a wireless temperature sensor;

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

[0031] S4: discharge the heated insulating oil body into the container through the oil outlet, and then use the filling pipe to fill the insulating gas into the inner side of the high-voltage cable terminal, and completely squeeze out the heated insulating oil body from the bottom of the terminal;

[0032] S5: The heated insulating oil body is reversely injected into the cable terminal through the oil outlet, and at the same time, the insulating gas in the bushing is squeezed out of the cable terminal from the inflation tube to achieve complete replacement of the insulating oil body.

[0033] As a preferred solution of the method for replacing insulating oil in the oil-type terminal of a high-voltage cable according to the present invention, sulfur tetrafluoride is used as the insulating gas.

[0034] The beneficial effects of the present invention are as follows: the fluidity of the insulating oil is improved by heating, and the operation of the heating component is controlled by cooperating with a wireless temperature measuring sensor, so that the insulating oil body can be smoothly discharged from the oil outlet at the bottom of the high-voltage cable terminal. The deteriorated insulating oil is completely removed from the inside by filling with insulating gas, and the insulating gas can maintain the electrical performance of the high-voltage cable terminal in a short time, thereby realizing the live oil extraction operation of the high-voltage cable oil terminal. Then, the heated insulating oil is injected from the oil outlet through the heating oil replenishing method, and the gas in the high-voltage cable terminal is removed from the inflation pipe and the inflation port, thereby realizing the oil change work of the cable oil terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0036] Figure 1 It 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 .

[0038] Figure 3 It is a schematic structural diagram of the heating component of the present invention.

[0039] Figure 4 It is a schematic diagram of the principle of the inflatable component of the present invention. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present 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 term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0043] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0044] Example 1

[0045] Reference Figure 1-2 , which is the first embodiment of the present invention, provides an insulating oil replacement device for a high-voltage cable oil-type terminal, including a high-voltage cable terminal 100, which includes a shell 101 and a base 102 fixedly connected to the shell 101, the shell 101 is fixedly installed on the upper side of the base 102 by bolts, a high-voltage cable body 103 is arranged inside the shell 101, and the high-voltage cable body 103 passes through the high-voltage cable terminal 100; a sealing sleeve 104, which is arranged between the base 102 and the high-voltage cable body 103, the base 102 tightly installs the sealing sleeve 104 between the shell 101 and the base 102, the inner side of the sealing sleeve 104 is tightly fitted with the outer side of the high-voltage cable body 103, and 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 shell 101, the sealing sleeve 104 and the high-voltage cable body 103, and the sealed chamber 106 contains the insulating oil body 105, which is a high-viscosity polyisobutylene viscous liquid; a heating component 200 is arranged between the sealing sleeve 104 and the high-voltage cable body 103, and the heating component 200 can heat the insulating oil body 105 to improve its fluidity and facilitate the insulating oil body 105 to flow out of the high-voltage cable terminal 100.

[0047] The sealing sleeve 104 includes a fixing seat 104a and a surrounding piece 104b fixedly connected to one side of the fixing seat 104a; a protrusion 104c is provided on the outer upper part of the fixing seat 104a, a recess 102a is provided on the inner upper part of the base 102, the protrusion 104c is nested and connected in the recess 102a, the shapes of the protrusion 104c and the recess 102a fit each other, and the sealing sleeve 104 is fixed by clamping the protrusion 104c between the shell 101 and the base 102, 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, thereby ensuring the tightness of the interior 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 passes through the high-voltage cable terminal 100, and the heating assembly 200 is inserted into the high-voltage cable body 103 when the cable oil terminal is installed, and is fixed inside the sealing sleeve 104. One end of the lead wire 202 is connected to a control assembly 300, and the control assembly 300 is used to control the opening and closing of the heating ring 201. The heating assembly 200 also includes a heat insulating member 203 fixedly connected to one side of the heating ring 201, and a heat conducting member 204 fixedly connected to the other side of the heating ring 201. The heat element 203 and the heat conductive element 204 are both arranged in an annular shape. The heating assembly 200 has three layers, which are the heat insulating element 203, the heating ring 201 and the heat conductive ring from the inside to the outside. The heat insulating element 203 is in contact with the high-voltage cable body 103. The heat insulating element 203 is made of heat insulating material to prevent the heating ring 201 from affecting the high-voltage cable when heating. The heat conductive element 204 is in contact with the sealing sleeve 104. The heat conductive element 204 is made of heat conductive material. The sealing sleeve 104 is also made of heat conductive aluminum alloy and can transfer heat to the insulating oil body 105. The viscosity of the insulating oil will decrease as the temperature increases.

[0049] The fixing seat 104a is provided with an oil outlet 107 which is communicated with the sealing chamber 106. The oil outlet 107 is usually closed and is opened only when oil is needed to be taken out or filled. When taking oil, the oil pipe is connected to discharge the insulating oil body 105 into the container.

[0050] A wireless temperature sensor 301 is fixedly installed on the inner side of the shell 101, and a temperature measuring antenna 302 is fixedly installed on the bottom; the wireless temperature measuring sensor 301 adopts a UHF passive wireless temperature sensor, the wireless temperature measuring sensor 301 is used to monitor the temperature of the insulating oil body 105, and the temperature measuring antenna 302 is used to receive the signal of the wireless temperature measuring sensor 301 and transmit the signal to the control component 300. The control component 300 can collect the temperature monitored by the wireless temperature measuring sensor 301, and control the heating component 200 to heat or stop heating through the temperature data.

[0051] In summary, the control component 300 can control the heating ring 201 to supply heat, and heat the insulating oil body 105 through the heat conduction of the heat conductor 204 and the sealing sleeve 104. 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 measuring antenna 302. The control component 300 receives the signal with temperature data. When the temperature data reaches 100°C, the viscosity is 645cst. ​​At this time, the fluidity of the insulating oil body 105 is sufficient for it to flow out smoothly from the oil outlet 107.

[0052] Example 2

[0053] Reference Figure 2-Figure 3, which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: an inflation component 400 is further provided inside the high-voltage cable terminal 100; the inflation component 400 includes an inflation tube 401 located in the sealed chamber 106, the inflation tube 401 and the high-voltage cable body 103 are arranged side by side, the bottom of the inflation tube 401 is fixedly connected to the fixing seat 104a, and the fixing seat 104a is provided with an inflation port 402, the inflation port 402 is connected to the inflation tube 401, and the inflation port 402 is in a closed state when not in use, so as to ensure the sealing inside the high-voltage cable terminal 100, and the top of the inflation tube 401 is higher than the liquid level of the insulating oil body 105.

[0054] In order to completely replace the deteriorated insulating oil body 105, it is necessary to use insulating gas to expel it. The insulating gas is sulfur tetrafluoride commonly used in high-voltage cable accessories. Its insulating performance can replace the insulating oil within a certain period of time. An air pump is used to connect the inflation port 402, and the gas is filled in the top space of the insulating oil inside the cable oil terminal through the set inflation pipe 401. The heated insulating oil is squeezed out from the bottom of the terminal through gas expansion, 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] When all the deteriorated insulating oil is taken out, new insulating oil is reversely injected into the high-voltage cable terminal 100 through the oil outlet 107. The insulating oil is first heated outside the cable terminal, and the new insulating oil is injected into the cable terminal from the bottom of the high-voltage cable terminal 100 through the oil pump oil pipe. At the same time, the air pump is turned off to squeeze the insulating gas in the high-voltage cable terminal 100 out of the cable terminal from the air pipe 401 to achieve complete replacement.

[0056] The remaining structures are the same as those of Example 1.

[0057] Example 3

[0058] Reference Figure 1 to Figure 3 , which is the third embodiment of the present invention, and this embodiment is different from the second embodiment in that: a method for replacing insulating oil in a high-voltage cable oil-type terminal, applied to any of the above-mentioned insulating oil replacement devices for high-voltage cable oil-type terminals, comprises the following steps:

[0059] S1: starting the heating component 200 through 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 through the wireless temperature sensor 301;

[0061] 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;

[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 inner side of the high-voltage cable terminal 100 through the filling pipe 401, and 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 reversely injected into the cable terminal through the oil outlet 107 , and at the same time, the insulating gas in the bushing is squeezed out of the cable terminal from the inflation tube 401 , so as to achieve complete replacement of the insulating oil body 105 .

[0064] The method of using insulating gas to completely discharge the insulating oil body 105 from the interior of the high-voltage cable terminal 100, and then using insulating oil to completely discharge the insulating gas from the interior of the high-voltage cable terminal 100, can achieve safe replacement of deteriorated insulating oil inside the cable oil terminal without power outage.

[0065] The insulating gas is sulfur tetrafluoride, and the filling port 402 is connected to the filling tube 401. The insulating gas can be filled into the internal space of the cable terminal through an air pump. When refilling is required, the insulating gas inside the high-voltage cable terminal 100 can also be extracted first to make the interior of the high-voltage cable terminal 100 in a vacuum state, which is convenient for subsequent filling of insulating oil.

[0066] In summary, by heating the insulating oil to reduce the viscosity of the insulating oil, the insulating oil body 105 will flow out naturally through the oil outlet hole at the bottom of the sealing sleeve 104 of the high-voltage cable terminal 100, and the terminal will be replenished with oil from the outside through an oil pump, so that the deteriorated insulating oil inside the cable oil terminal can be safely replaced without power outage. In addition, the temperature of the insulating oil body 105 inside the high-voltage cable terminal 100 is collected by the control component 300, and the heating component 200 is controlled to set the heating temperature, so that the insulating oil temperature 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 of Example 2.

[0068] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0069] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0070] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A high voltage cable oil terminal insulating oil replacement device, characterized in that: include, A high-voltage cable terminal (100) comprises a housing (101) and a base (102) fixedly connected to the housing (101); a high-voltage cable body (103) is arranged inside the housing (101); and the high-voltage cable body (103) passes through the high-voltage cable terminal (100); A sealing sleeve (104) is arranged 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 with the outer side of the high-voltage cable body (103); An insulating oil body (105), a sealed chamber (106) is formed between the housing (101), the sealing sleeve (104) and the high-voltage cable body (103), and the insulating oil body (105) is contained in the sealed chamber (106); A heating component (200) is arranged between the sealing sleeve (104) and the high-voltage cable body (103).

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

3. The high-voltage cable oil terminal insulating oil replacement device according to claim 2 is characterized in that: The heating assembly (200) comprises 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), and the control component (300) is used to control the opening and closing of the heating ring (201).

4. The insulating oil replacement device for the high-voltage cable oil-type terminal according to claim 3 is characterized in that: The heating assembly (200) further comprises a heat insulating member (203) connected to one side of the heating ring (201), and a heat conducting member (204) connected to the other side of the heating ring (201); The heat insulating member (203) is in contact with the high-voltage cable body (103), and the heat conducting member (204) is in contact with the sealing sleeve (104).

5. The insulating oil replacement device for the high-voltage cable oil terminal according to claim 4 is characterized in that: The fixing seat (104a) is provided with an oil outlet (107), and the oil outlet (107) is communicated with the sealing chamber (106).

6. The insulating oil replacement device for the high-voltage cable oil-type terminal according to claim 5 is characterized in that: A wireless temperature measurement sensor (301) is installed on the housing (101), and a temperature measurement antenna (302) is installed on the base (102); The wireless temperature sensor (301) is a UHF passive wireless temperature sensor. The wireless temperature sensor (301) is used to monitor the temperature of the insulating oil body (105). The temperature measuring antenna (302) is used to receive a 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 according to the temperature data.

7. The insulating oil replacement device for the high-voltage cable oil-type terminal according to claim 6 is characterized in that: The high-voltage cable terminal (100) is also provided with an inflatable component (400); The inflation component (400) comprises an inflation tube (401) located in the sealed chamber (106); the bottom of the inflation tube (401) is connected to the fixing seat (104a); the fixing seat (104a) is provided with an inflation port (402), and the inflation port (402) is connected to the inflation tube (401).

8. The insulating oil replacement device for the high-voltage cable oil-type terminal according to claim 7 is characterized in that: The top of the inflation tube (401) is higher than the liquid level of the insulating oil body (105).

9. A method for replacing insulating oil in a high-voltage cable oil-type terminal, applied to a device for replacing insulating oil in a high-voltage cable oil-type terminal as claimed in any one of claims 7 to 8, characterized in that: The steps include: S1: starting the heating component (200) through the control component (300) to heat the insulating oil body (105) inside the high-voltage cable terminal (100); S2: monitoring the temperature of the insulating oil body (105) through 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 inner side of the high-voltage cable terminal (100) through the gas filling pipe (401), and the heated insulating oil body (105) is completely squeezed out from the bottom of the terminal; S5: The heated insulating oil body (105) is reversely injected into the cable terminal through the oil outlet (107), and the insulating gas in the bushing is squeezed out of the cable terminal from the gas filling pipe (401), thereby achieving complete replacement of the insulating oil body (105).

10. The method for replacing insulating oil in a high-voltage cable oil-type terminal according to claim 9, characterized in that: The insulating gas is sulfur tetrafluoride.

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