A high voltage cable buffer layer and terminal gas on-site detection device and method

Abstract

The application relates to the technical field of cable detection, in particular to a high-voltage cable buffer layer and terminal gas on-site detection device, which comprises a conductive wire core, the outside of the conductive wire core is wrapped with cable terminal insulation, the inside of the cable terminal insulation is provided with a stress cone, the inside of the stress cone is provided with an insulation shielding layer, the right side of the cable terminal insulation is detachably provided with a tail pipe, the inside of the tail pipe is provided with a metal sheath, the inside of the metal sheath is provided with a buffer layer, the buffer layer is wrapped outside a main insulation layer, and the right side of the tail pipe is provided with an outer sheath. The gas collection mechanism is arranged, the gas of the cable terminal part and the cable buffer layer is collected and component analyzed, the correlation between characteristic gas and defects is used, the judgment of the cable terminal and the buffer layer defects and the operation state is realized, the early warning and maintenance of the cable low-field-strength-area latent defects and faults are facilitated, and the application has the characteristics of simple structure, convenient operation, safety and reliability and the like.

Description

Technical Field

[0001] This invention relates to the field of cable testing technology, and in particular to a device and method for on-site testing of gas in the buffer layer and terminal of a high-voltage cable. Background Technology

[0002] High-voltage cables are commonly used in power supply and distribution systems. Due to factors such as manufacturing processes, installation procedures, operating conditions, and external damage, latent defects can easily appear in the low-field-strength areas within the cables after long-term operation. These defects include partial discharge and ablation of the cable buffer layer, partial discharge and ablation of the insulation and stress cones of cable accessories, poor lead seals on accessories, and water seepage corrosion. The buffer layer of a high-voltage cable is located between the cable insulation shield and the metal sheath, serving as an electrical connection and moisture absorption layer. Latent defects in the cable terminals and buffer layer can seriously affect the distribution of the electric and thermal fields inside the cable, reduce the insulation performance of the insulation layer, and create potential safety hazards for the operation of the power system. Therefore, early detection of cable defects is particularly important and can effectively reduce the cable failure rate.

[0003] Chinese invention patent application CN115078580A proposes a method for detecting defects in the buffer layer of high-voltage XLPE cables based on characteristic gases. This method collects gas by drilling holes in the buffer layer, but it can only determine whether the cable buffer layer is in a defective state, and cannot further determine the specific defect type or the operating status of the cable terminal. Chinese invention patent application CN110850036A designs a device for detecting hydrogen generation in the air gap of the cable buffer layer under operating conditions. It detects changes in hydrogen content to determine whether the buffer layer reacts with the aluminum sheath. However, it is limited to measurement in a closed laboratory chamber and cannot be applied to field testing. It also cannot analyze the defects and operating status of the cable terminal. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a field detection device for high-voltage cable buffer layer and terminal gas, which solves the technical problems of low detection accuracy and inability to determine specific defect types in existing cable buffer layer detection devices. It has the advantages of being able to determine both the operating status of the cable terminal and the specific defect type.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high-voltage cable buffer layer and terminal gas field detection device, comprising a conductive core, a main insulation layer surrounding the conductive core, cable terminal insulation surrounding the conductive core, a composite sleeve surrounding the cable terminal insulation, a stress cone inside the cable terminal insulation, a copper mesh on the right side of the stress cone, an insulating shielding layer inside the stress cone, a tail tube detachably installed on the right side of the cable terminal insulation, a metal sheath inside the tail tube, a buffer layer inside the metal sheath, the buffer layer surrounding the main insulation layer, an outer sheath on the right side of the tail tube, a lead seal between the tail tube and the outer sheath, a gas collection mechanism above the tail tube, a gas analysis module for gas detection on the right side of the gas collection mechanism, and an independent power supply mechanism inside the gas collection mechanism. During cable maintenance, the gas collection mechanism samples and detects the gas inside the cable terminal insulation and buffer layer. After sampling, the gas analysis module analyzes the gas components to determine the damage condition of the cable end.

[0006] Preferably, the gas collection mechanism includes a three-way ball valve fixedly installed outside the tailpipe. A first air inlet pipe and a second air inlet pipe are symmetrically arranged on the left and right sides of the three-way ball valve. An exhaust bend pipe is connected to the upper end of the three-way ball valve. A sealing ball is movably installed inside the three-way ball valve. A manual rotary wheel for rotating the sealing ball is provided at the lower end of the three-way ball valve. A main air valve is provided on the exhaust bend pipe. A small air pump is provided at the end of the exhaust bend pipe. The exhaust end of the small air pump is connected to the gas analysis module. When the small air pump is working, the gas inside the tailpipe will enter the interior of the gas analysis module through the second air inlet pipe and the exhaust bend pipe.

[0007] Preferably, the first intake pipe extends to the gap between the metal sheath and the tailpipe, and the second intake pipe extends to the interior of the buffer layer. When the three-way ball valve is connected to the first intake pipe, it will draw the gas in the gap between the metal sheath and the tailpipe upward. When the three-way ball valve is connected to the second intake pipe, it will draw the gas inside the buffer layer upward.

[0008] Preferably, the manual rotary wheel is movably installed at the lower end of the three-way ball valve. The manual rotary wheel is connected to the sealing ball in a transmission manner. When the operator rotates the manual rotary wheel, the sealing ball will rotate synchronously, thereby connecting the side opening of the sealing ball with the first air inlet pipe or the second air inlet pipe.

[0009] Preferably, the independent power supply mechanism includes a mounting leg fixedly installed outside the second air intake pipe. A battery pack is detachably installed inside the mounting leg. A movable ring is movably installed outside the mounting leg. A rotating impeller is fixedly installed outside the movable ring. A power generation component is installed inside the rotating impeller. A spoiler to increase wind resistance is provided at the lower end of the rotating impeller. A photovoltaic component is provided on the upper surface of the rotating impeller. When the wind blows, the rotating impeller will rotate rapidly under the action of wind force and spoiler. The rotating impeller can charge the battery pack when it rotates.

[0010] Preferably, the photovoltaic module is a solar photovoltaic panel. On sunny days, the solar photovoltaic panel can convert light energy into electrical energy and store it inside the battery pack, thereby extending the duration of continuous power supply from the battery pack.

[0011] Preferably, there are several rotating impellers arranged at equal intervals, and each rotating impeller is equipped with a baffle and a photovoltaic module. During gas detection, the movable ring will rotate under the action of multiple baffles and rotating impellers.

[0012] As described above, the cable buffer layer and terminal gas detection method are as follows: First, rotate the manual rotary wheel to connect the side of the sealing sphere with the first air inlet pipe. Then, open the main air valve. Next, the gas in the gap between the tail pipe and the metal sheath will enter the interior of the exhaust bend under the action of the small air pump. Subsequently, the gas analysis module will detect and analyze the gas components. If it is necessary to analyze and detect the air in the buffer layer, rotate the manual rotary wheel in the opposite direction to connect the side of the sealing sphere with the second air inlet pipe. Then, the gas inside the buffer layer will enter the interior of the exhaust bend through the second air inlet pipe. Next, the gas analysis module will detect and analyze the gas components again. In addition, if the cable loses power due to a fault, the battery pack will provide independent power to the small air pump to ensure the normal operation of the detection work. At the same time, the photovoltaic module and the rotating impeller will charge the battery pack.

[0013] By employing the above technical solution, the present invention provides a high-voltage cable buffer layer and a terminal gas field detection device, which has at least the following beneficial effects:

[0014] 1. This invention, by setting up a gas collection mechanism, collects and analyzes the gas at the cable terminal and the cable buffer layer. Based on the correlation between characteristic gases and defects, it enables the judgment of defects and operating conditions of the cable terminal and buffer layer. This helps in the early warning and maintenance of latent defects and faults in the low field strength area of ​​the cable. It has the characteristics of simple structure, convenient operation, and safety and reliability.

[0015] 2. By setting up a gas collection mechanism, the present invention can automatically collect gas from different parts of the cable terminal by using the cooperation between the three-way ball valve and the manual rotary wheel, which helps to determine the type and approximate location of typical defects.

[0016] 3. By setting up a gas collection mechanism, the first air inlet pipe placed at the tailpipe gap can collect gas from the terminal stress cone, metal sheath and lead seal, while the second air inlet pipe can collect gas generated by the buffer layer and main insulation layer. The two do not interfere with each other and can effectively improve the accuracy of detection.

[0017] 4. By setting up an independent power supply mechanism and utilizing the cooperation between the mounting legs and the battery pack, this invention can independently supply power to the small air pump after the cable is de-energized, ensuring that gas collection and maintenance work can be carried out normally. There is no need for workers to climb to the top of the utility pole to supply power to the small air pump, which can greatly improve the efficiency and safety of cable maintenance.

[0018] 5. By setting up an independent power supply mechanism and utilizing the cooperation between photovoltaic modules and rotating impeller, this invention can automatically charge the battery pack in sunny and windy weather, which can effectively increase the battery pack's driving time and reduce the frequency of battery pack replacement. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1 This is a front view of the overall structure of the present invention;

[0021] Figure 2 This is a cross-sectional view of the overall structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the gas collection mechanism in this invention;

[0023] Figure 4 This is a schematic diagram of the three-way ball valve structure in this invention;

[0024] Figure 5 This is an internal schematic diagram of the support leg installation structure in this invention;

[0025] Figure 6 This is an internal schematic diagram of the independent power supply mechanism in this invention;

[0026] Figure 7 This is a schematic diagram showing the installation position of the spoiler structure in this invention.

[0027] In the diagram: 1. Conductive core; 2. Cable terminal insulation; 3. Composite sleeve; 4. Stress cone; 5. Copper mesh; 6. Main insulation layer; 7. Insulation shielding layer; 8. Tail pipe; 9. Metal sheath; 10. Buffer layer; 11. Lead seal; 12. Outer sheath; 13. Gas collection mechanism; 131. Three-way ball valve; 132. First air inlet pipe; 133. Second air inlet pipe; 134. Exhaust bend; 135. Sealing ball; 136. Manual rotary wheel; 137. Main air valve; 138. Small air pump; 14. Gas analysis module; 15. Independent power supply mechanism; 151. Mounting leg; 152. Battery pack; 153. Movable ring; 154. Rotating impeller; 155. Baffle plate; 156. Photovoltaic module. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] according to Figures 1-5 As shown, a high-voltage cable buffer layer and terminal gas field detection device includes a conductive core 1, a main insulation layer 6 surrounding the conductive core 1, a cable terminal insulation 2 covering the conductive core 1, a composite sleeve 3 surrounding the cable terminal insulation 2, a stress cone 4 inside the cable terminal insulation 2, a copper mesh 5 on the right side of the stress cone 4, an insulating shielding layer 7 inside the stress cone 4, a tail tube 8 detachably installed on the right side of the cable terminal insulation 2, a metal sheath 9 inside the tail tube 8, and a buffer layer 10 inside the metal sheath 9. The buffer layer 10 wraps around... Outside the main insulation layer 6, an outer sheath 12 is provided on the right side of the tail tube 8. A lead seal 11 is provided between the tail tube 8 and the outer sheath 12. A gas collection mechanism 13 is provided above the tail tube 8. A gas analysis module 14 for gas detection is provided on the right side of the gas collection mechanism 13. An independent power supply mechanism 15 is provided inside the gas collection mechanism 13. During cable maintenance, the gas collection mechanism 13 will sample and detect the gas inside the cable terminal insulation 2 and the buffer layer 10. After sampling, the gas analysis module 14 will detect and analyze the gas components to determine the damage condition of the cable end.

[0031] Specifically, the gas collection mechanism 13 includes a three-way ball valve 131 fixedly installed outside the tailpipe 8. A first air inlet pipe 132 and a second air inlet pipe 133 are symmetrically arranged on the left and right sides of the three-way ball valve 131. The first air inlet pipe 132 extends to the gap between the metal sheath 9 and the tailpipe 8, and the second air inlet pipe 133 extends into the interior of the buffer layer 10. When the three-way ball valve 131 is connected to the first air inlet pipe 132, it draws the gas from the gap between the metal sheath 9 and the tailpipe 8 upwards. When the three-way ball valve 131 is connected to the second air inlet pipe 133, it draws the gas from inside the buffer layer 10 upwards. An exhaust bend 134 is connected to the upper end of the three-way ball valve 131. A sealing ball 135 is movably installed inside the three-way ball valve 131. The lower end of the three-way ball valve 131... A manual rotating wheel 136 is provided for rotating the sealing ball 135. The manual rotating wheel 136 is movably installed at the lower end of the three-way ball valve 131. The manual rotating wheel 136 is connected to the sealing ball 135 in a transmission manner. When the operator rotates the manual rotating wheel 136, the sealing ball 135 will rotate synchronously, so that the side opening of the sealing ball 135 is connected to the first air inlet pipe 132 or the second air inlet pipe 133. A main air valve 137 is provided on the exhaust bend pipe 134. A small air pump 138 is provided at the end of the exhaust bend pipe 134. The exhaust end of the small air pump 138 is connected to the gas analysis module 14. When the small air pump 138 is working, the gas inside the tail pipe 8 will enter the interior of the gas analysis module 14 through the second air inlet pipe 133 and the exhaust bend pipe 134.

[0032] In this embodiment, if it is necessary to detect and analyze the gas in the gap between the metal sheath 9 and the tailpipe 8, the operator will turn the manual rotary wheel 136 counterclockwise to connect the side opening of the sealing ball 135 with the first air inlet pipe 132, and then open the main air valve 137.

[0033] Next, the gas in the gap between the metal sheath 9 and the tailpipe 8 will enter the interior of the first intake pipe 132 under the action of the small air pump 138, and enter the interior of the gas analysis module 14 through the exhaust bend 134.

[0034] Subsequently, the gas analysis module 14 will detect and analyze the gas components. If the collected gas is mainly hydrogen, it indicates that corrosion has occurred at the metal sheath 9, copper mesh 5, or lead seal 11, corresponding to water seepage or crack defects at the cable terminal. If the collected gas contains carbon dioxide, carbon monoxide, hydrogen, and hydrocarbon gases, it corresponds to partial discharge or ablation defects at the cable terminal.

[0035] In addition, if it is necessary to test and analyze the gas inside the buffer layer 10, the staff will turn the manual rotary wheel 136 clockwise to connect the side opening of the sealing ball 135 with the second air inlet pipe 133, and then open the main air valve 137.

[0036] If the gas collected from the buffer layer 10 is mainly hydrogen, it corresponds to the electrochemical corrosion of the metal sheath 9 and the moisture defect of the buffer layer 10. If the gas composition contains a large amount of alkanes and olefins, it corresponds to the partial discharge and ablation defects of the cable buffer layer 10. If the gas composition contains a large amount of alkynes, it corresponds to the floating potential discharge and ablation defects of the cable buffer layer 10.

[0037] This embodiment, by setting up a gas collection mechanism 13, collects and analyzes the gas at the cable terminal and the cable buffer layer 10. Based on the correlation between characteristic gases and defects, it enables the judgment of defects and operating conditions of the cable terminal and the buffer layer 10. This helps in the early warning and maintenance of latent defects and faults in the low field strength area of ​​the cable. It has the characteristics of simple structure, convenient operation, and safety and reliability. Moreover, by setting up a gas collection mechanism 13, this embodiment can automatically collect gas from different parts of the cable terminal by using the cooperation between the three-way ball valve 131 and the manual rotary wheel 136, which helps to determine the type and approximate location of typical defects. In addition, by setting up a gas collection mechanism 13, the first air inlet pipe 132, located at the gap of the tail tube 8, can collect gas from the terminal stress cone 4, metal sheath 9, and lead seal 11, while the second air inlet pipe 133 can collect gas generated by the buffer layer 10 and the main insulation layer 6. The two do not interfere with each other, which can effectively improve the accuracy of detection.

[0038] Example 2

[0039] according to Figure 2 as well as Figures 5-7 As shown, based on Embodiment 1, the independent power supply mechanism 15 includes a mounting leg 151 fixedly installed outside the second air intake pipe 133. A battery pack 152 is detachably installed inside the mounting leg 151. A movable ring 153 is movably installed outside the mounting leg 151. A rotating impeller 154 is fixedly installed outside the movable ring 153. A power generation component is provided inside the rotating impeller 154. A baffle 155 to increase wind resistance is provided at the lower end of the rotating impeller 154. A photovoltaic module 156 is provided on the upper surface of the rotating impeller 154. Several rotating impellers 154 are evenly spaced. Each rotating impeller 154 is provided with a baffle 155 and a photovoltaic module 156. During gas detection, the movable ring 153 will rotate under the action of multiple baffles 155 and rotating impellers 154. When the rotating impeller 154 rotates, it can charge the battery pack 152.

[0040] Specifically, the photovoltaic module 156 is a solar photovoltaic panel. On sunny days, the solar photovoltaic panel can convert light energy into electrical energy and store it inside the battery pack 152, thereby extending the duration of continuous power supply of the battery pack 152.

[0041] In this embodiment, during the gas detection process, the battery pack 152 provides independent power to the small air pump 138. Therefore, even if the staff has disconnected the power to the cable, the gas detection operation can still continue without the need to connect a separate power source, which can greatly increase the convenience of cable maintenance.

[0042] Moreover, on sunny days, the photovoltaic module 156 will actively convert light energy into electrical energy and store it inside the battery pack 152. Even in cloudy or rainy weather, when the wind blows, the rotating impeller 154 will also rotate under the action of the spoiler 155. When the rotating impeller 154 rotates, it can also charge the battery pack 152 through the power generation module, which can greatly improve the battery pack 152's driving range.

[0043] This embodiment, by setting up an independent power supply mechanism 15, utilizes the cooperation between the mounting legs 151 and the battery pack 152 to independently power the small air pump 138 after the cable is de-energized, ensuring that gas collection and maintenance work can proceed normally. This eliminates the need for workers to climb to the top of the utility pole to power the small air pump 138, greatly improving the efficiency and safety of cable maintenance. Furthermore, by setting up the independent power supply mechanism 15, and utilizing the cooperation between the photovoltaic module 156 and the rotating impeller 154, this embodiment can automatically charge the battery pack 152 in sunny and windy conditions, effectively increasing the battery pack 152's operating time and reducing its replacement frequency.

[0044] Example 3

[0045] Based on the above, the method for detecting gas in the cable buffer layer and terminal is as follows:

[0046] 1. Rotate the manual turntable 136 to connect the side of the sealing ball 135 with the first air inlet pipe 132, and then open the main air valve 137.

[0047] Second, next, the gas in the gap between the tailpipe 8 and the metal sheath 9 will enter the interior of the exhaust bend 134 under the action of the small air pump 138. Subsequently, the gas analysis module 14 will detect and analyze the gas components.

[0048] 3. If it is necessary to analyze and test the air in the buffer layer 10, rotate the manual turn wheel 136 in the opposite direction to connect the side of the sealing ball 135 with the second air inlet pipe 133. Then, the gas inside the buffer layer 10 will enter the interior of the exhaust bend pipe 134 through the second air inlet pipe 133. Next, the gas analysis module 14 will test and analyze the gas components again.

[0049] 4. If the cable loses power due to a fault, the battery pack 152 will provide independent power to the small air pump 138 to ensure the normal operation of the testing work. At the same time, the photovoltaic module 156 and the rotating impeller 154 will charge the battery pack 152.

[0050] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-voltage cable buffer layer and terminal gas field detection device, comprising a conductive core (1), a main insulation layer (6) sleeved on the outside of the conductive core (1), a cable terminal insulation (2) wrapped around the outside of the conductive core (1), a composite sleeve (3) disposed on the outside of the cable terminal insulation (2), a stress cone (4) disposed inside the cable terminal insulation (2), and a copper mesh (5) disposed on the right side of the stress cone (4), characterized in that: An insulating shielding layer (7) is provided inside the stress cone (4). A tail tube (8) is detachably installed on the right side of the cable terminal insulation (2). A metal sheath (9) is provided inside the tail tube (8). A buffer layer (10) is provided inside the metal sheath (9). The buffer layer (10) is wrapped around the outside of the main insulation layer (6). An outer sheath (12) is provided on the right side of the tail tube (8). A lead seal (11) is provided between the tail tube (8) and the outer sheath (12). A gas collection mechanism (13) is provided above the tail tube (8). A gas analysis module (14) for gas detection is provided on the right side of the gas collection mechanism (13). An independent power supply mechanism (15) is provided inside the gas collection mechanism (13). The gas collection mechanism (13) includes a three-way ball valve (131) fixedly installed outside the tail pipe (8). The three-way ball valve (131) is symmetrically provided with a first air inlet pipe (132) and a second air inlet pipe (133) on its left and right sides. The upper end of the three-way ball valve (131) is connected to an exhaust bend pipe (134). A sealing ball (135) is movably installed inside the three-way ball valve (131). The side opening of the sealing ball (135) is connected to the first air inlet pipe (132) or the second air inlet pipe (133). The lower end of the three-way ball valve (131) is provided with a manual rotating wheel (136) for rotating the sealing ball (135). A main air valve (137) is provided on the exhaust bend pipe (134). A small air pump (138) is provided at the end of the exhaust bend pipe (134). The exhaust end of the small air pump (138) is connected to the gas analysis module (14). The first intake pipe (132) extends to the gap between the metal sheath (9) and the tailpipe (8), and the second intake pipe (133) extends into the interior of the buffer layer (10).

2. The high-voltage cable buffer layer and terminal gas field detection device according to claim 1, characterized in that: The manual rotary wheel (136) is movably installed at the lower end of the three-way ball valve (131), and the manual rotary wheel (136) is connected to the sealing ball (135) in a transmission connection.

3. The high-voltage cable buffer layer and terminal gas field detection device according to claim 1, characterized in that: The independent power supply mechanism (15) includes a mounting leg (151) fixedly installed outside the second air intake pipe (133). A battery pack (152) is detachably installed inside the mounting leg (151). A movable ring (153) is movably installed outside the mounting leg (151). A rotating impeller (154) is fixedly installed outside the movable ring (153). A power generation component is provided inside the rotating impeller (154). A baffle (155) to increase wind resistance is provided at the lower end of the rotating impeller (154). A photovoltaic module (156) is provided on the upper surface of the rotating impeller (154).

4. The high-voltage cable buffer layer and terminal gas field detection device according to claim 3, characterized in that: The photovoltaic module (156) is a solar photovoltaic panel.

5. The high-voltage cable buffer layer and terminal gas field detection device according to claim 3, characterized in that: The rotating impellers (154) are arranged at equal intervals, and each rotating impeller (154) is provided with a baffle (155) and a photovoltaic module (156).

6. A high-voltage cable buffer layer and terminal gas field detection device according to any one of claims 1-5, characterized in that: The detection method for the high-voltage cable buffer layer and terminal gas field detection device is as follows:

1. Rotate the manual turntable (136) to connect the side of the sealing ball (135) with the first air inlet pipe (132), and then open the main air valve (137). Second, next, the gas in the gap between the tailpipe (8) and the metal sheath (9) will enter the interior of the exhaust bend (134) under the action of the small air pump (138). Subsequently, the gas analysis module (14) will detect and analyze the gas components.

3. If it is necessary to analyze and detect the gas in the buffer layer (10), rotate the manual turntable (136) in the opposite direction to connect the side of the sealing ball (135) with the second air inlet pipe (133). Then, the gas inside the buffer layer (10) will enter the interior of the exhaust bend pipe (134) through the second air inlet pipe (133). Next, the gas analysis module (14) will detect and analyze the gas components again. Fourth, if the cable loses power due to a fault, the battery pack (152) will provide independent power to the small air pump (138) to ensure the normal operation of the testing work. At the same time, the photovoltaic module (156) and the rotating impeller (154) will charge the battery pack (152).

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