Buffer layer ablation inhibitor injection equipment and method for high-voltage cable

Abstract

The invention discloses a buffer layer ablation inhibitor injection device and method for a high-voltage cable. The buffer layer ablation inhibitor injection device comprises a constant-voltage injection device and a pulse injection device. The constant-pressure injection device comprises a high-pressure generator, an injection pipeline, a backflow pipeline and a storage assembly used for storing the buffer layer ablation inhibitor. The high-pressure generator is in pipeline connection with an air inlet of the storage assembly through a first flow direction control valve, a liquid outlet of the storage assembly is in pipeline connection with one end of the injection pipeline, and an output port of the pulse injection device is simultaneously in pipeline connection with a backflow port of the storage assembly and one end of the backflow pipeline; a reflux inlet of the pulse injection device is in pipeline connection with the other end of the reflux pipeline; an injection control valve is arranged on the injection pipeline, a backflow control valve is arranged on the backflow pipeline, and the other end of the injection pipeline and the other end of the backflow pipeline are used for being connected with the two ends of a fault cable respectively. The injection process of the buffer layer ablation inhibitor is stable and reliable enough, and it is guaranteed that repairing operation is completed smoothly.

Description

Technical Field

[0001] The invention relates to the technical field of cable maintenance, and in particular to a device and method for injecting a buffer layer ablation inhibitor of a high-voltage cable. Background Art

[0002] Cross-linked polyethylene (XLPE) cables have become key equipment for power transmission in high-voltage power transmission systems due to their excellent insulation and mechanical properties. The buffer layer of XLPE cables not only ensures a good electrical connection between the insulation shield and the aluminum sheath, but also provides a waterproof function, which has a direct impact on the electrical and insulation properties of the cable. However, the buffer layer of XLPE cables may age and fail due to a variety of factors. These factors include aging caused by electrical and thermal stress, chemical effects, improper design, etc. These aging and failure problems not only affect the reliability and stability of the cable, but may also lead to safety accidents in the cable system.

[0003] To this end, existing researchers and maintenance personnel have developed a buffer layer repair liquid, namely a buffer layer ablation inhibitor, and gradually established practical repair processes and technologies, which are of great significance for optimizing cable design, improving system reliability, reducing failure rates and reducing grid operation costs. In existing schemes, such as the introduction device proposed in patents 202010516040, 202011617374, and 202211553042, it generally includes a repair liquid introduction storage tank or a repair liquid introduction tank, an introduction sealing tool used at both ends of the cable, a buffer tank, a liquid collection tank, a pipeline and a pressurization / vacuum device. The entire set of pipelines is connected to the cable through the tooling, and then pressurization or vacuum is used to drive the liquid to flow and penetrate into the defect to repair the cable.

[0004] However, although the current buffer layer ablation inhibitor has certain flow properties, the polymer materials used, such as silicone and polyurethane, also have certain viscosity. There are problems such as excessive pressure and blockage during application, which affects the smoothness of the injection of the buffer layer ablation inhibitor, easily causing the repair operation to stagnate and reducing work efficiency. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a device and method for injecting a buffer layer ablation inhibitor into a high-voltage cable, so that the injection process of the buffer layer ablation inhibitor is sufficiently stable and reliable to ensure the smooth completion of the repair work.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A buffer layer ablation inhibitor injection device for a high voltage cable, comprising a constant pressure injection device and a pulse injection device; The constant pressure injection device comprises a high voltage generator, an injection pipeline, a return pipeline and a storage component for storing a buffer layer ablation inhibitor; The high-pressure generator is connected to the air inlet pipe of the storage component through a first flow direction control valve, the liquid outlet of the storage component is connected to one end of the injection pipe, the output port of the pulse injection device is connected to the reflux port of the storage component and one end of the reflux pipe at the same time, and the reflux port of the pulse injection device is connected to the other end of the reflux pipe; An injection control valve is provided on the injection pipeline, and a reflux control valve is provided on the reflux pipeline. The other end of the injection pipeline and the other end of the reflux pipeline are respectively used to connect the two ends of the faulty cable.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for injecting a buffer layer ablation inhibitor into a high-voltage cable, applied to the above-mentioned device for injecting a buffer layer ablation inhibitor into a high-voltage cable, comprises the following steps: S1. Connect the injection pipe and the return pipe to both ends of the faulty cable; S2. When the injection starts, the first flow direction control valve, the injection control valve and the reflux control valve are opened, the high voltage generator is started and the pulse injection device is kept in a closed state, so as to realize constant current injection of the buffer layer ablation inhibitor from the storage component to the faulty cable, that is, enter the constant pressure injection mode; S3, when a blockage or abnormal pressure rise occurs in the pipeline, the reflux control valve is closed, the pulse injection device is started, and it is determined whether the first flow direction control valve is closed. If so, the pulse injection mode is entered, otherwise, the constant pressure and pulse combined injection mode is entered; S4. When the pipeline is no longer blocked or the pressure returns to normal, the pulse injection device is turned off and the constant pressure injection mode is returned to.

[0008] The beneficial effects of the present invention are: providing a buffer layer ablation inhibitor injection device and method for a high-voltage cable, utilizing a high-voltage generator, an injection pipeline, a return pipeline and a storage component to form a constant-pressure injection pipeline loop, and adding a pulse injection device on this basis, and through the control of the first flow direction control valve, the injection control valve and the return control valve, the device can be flexibly switched from a constant-pressure injection mode, a pulse injection mode or an injection mode combining constant pressure and pulse, so as to cope with blockage or abnormal pressure increase that may occur during the injection process, so that the injection process of the buffer layer ablation inhibitor is sufficiently stable and reliable, and the repair work can be ensured to be completed smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a connection schematic diagram of a buffer layer ablation inhibitor injection device of a high-voltage cable during injection of the present invention; Figure 2It is a schematic diagram of the installation of a locking connector and an on-off control component of a buffer layer ablation inhibitor injection device for a high-voltage cable according to the present invention; Figure 3 It is a structural schematic diagram of a pulse injection device of a buffer layer ablation inhibitor injection device of a high-voltage cable according to the present invention; Figure 4 The figure is a schematic diagram of the steps of a method for injecting a buffer layer ablation inhibitor into a high-voltage cable according to the present invention.

[0010] Description of labels: a, first flow control valve; b, second flow control valve; c, return flow control valve; d, third flow control valve; e, injection control valve; 1. High-voltage generator; 2. Injection pipeline; 3. Return pipeline; 4. Pulse injection device; 5. Fault cable; 6. Recovery storage tank; 7. Injection storage tank; 8. Pretreatment device; 9. Locking connector; 10. On / off control component; 41. Pulse controller; 42. Plunger pump; 43. Inlet reflux valve; 44. Outlet reflux valve; 51. Cable core; 52. Cable buffer layer; 53. Cable corrugated aluminum sheath. DETAILED DESCRIPTION

[0011] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0012] Please refer to Figures 1 to 3 , a buffer layer ablation inhibitor injection device for a high voltage cable, comprising a constant pressure injection device and a pulse injection device 4; The constant pressure injection device comprises a high voltage generator 1, an injection pipeline 2, a return pipeline 3 and a storage component for storing a buffer layer ablation inhibitor; The high-pressure generator 1 is connected to the air inlet pipe of the storage component through the first flow control valve a, the liquid outlet of the storage component is connected to one end of the injection pipe 2, the output port of the pulse injection device 4 is simultaneously connected to the reflux port of the storage component and one end of the reflux pipe 3, and the reflux port of the pulse injection device 4 is connected to the other end of the reflux pipe 3; The injection pipe 2 is provided with an injection control valve e, the return pipe 3 is provided with a return control valve c, and the other end of the injection pipe 2 and the other end of the return pipe 3 are used to connect the two ends of the faulty cable 5 respectively.

[0013] From the above description, it can be seen that the beneficial effects of the present invention are: a constant pressure injection pipeline 2 loop is composed of a high-voltage generator 1, an injection pipeline 2, a return pipeline 3 and a storage component, and a pulse injection device 4 is added on this basis. By controlling the first flow direction control valve a, the injection control valve e and the return control valve c, the equipment can be flexibly switched from a constant pressure injection mode, a pulse injection mode or an injection mode combining constant pressure and pulse, so as to cope with blockage or abnormal pressure increase that may occur during the injection process, so that the injection process of the buffer layer ablation inhibitor is sufficiently stable and reliable to ensure the smooth completion of the repair operation.

[0014] Furthermore, the high-pressure generator may be a high-pressure gas source or used in a hydraulic device or a pressure pump device; Further, the storage assembly includes a recovery storage tank 6 and an injection storage tank 7; The recovery storage tank 6 is connected to the injection storage tank 7 through a pipeline via a second flow direction control valve b, and the air inlet and the reflux port are both arranged on the recovery storage tank 6 .

[0015] From the above description, it can be seen that the storage part is composed of a recovery storage tank 6 and an injection storage tank 7. The high-voltage generator 1 injects the buffer layer ablation inhibitor into the faulty cable 5 through the injection storage tank 7 and the injection pipe 2, and the buffer layer ablation inhibitor flowing out from the other end of the faulty cable 5 flows back to the recovery storage tank 6 through the return pipe 3. Before injection, the buffer layer ablation inhibitor in the recovery storage tank 6 can be discharged into the injection storage tank 7, and the cycle is repeated in this way to improve resource utilization while ensuring sufficient repair.

[0016] Furthermore, it also includes a third flow direction control valve d, and the third flow direction control valve d is arranged at the output port of the pulse injection device 4.

[0017] From the above description, it can be seen that the third flow direction control valve d is set so that the device does not need to open and close the pulse injection device 4 when switching modes, but instead controls the opening and closing state of the third flow direction control valve d, thereby simplifying the control process and improving the response speed of the device.

[0018] Furthermore, it also includes a pre-treatment device 8, which is arranged on the liquid outlet of the storage component and / or the reflux port of the storage component; The pre-treatment device 8 is used to treat the buffer layer ablation inhibitor.

[0019] From the above description, it can be seen that by arranging the pretreatment device 8 on the pipeline, the buffer layer ablation inhibitor can be pretreated during the injection process, thereby facilitating the detection of abnormalities, improving quality, etc.

[0020] Further, the pulse injection device 4 includes a pulse controller 41, a plunger pump 42, an inlet reflux valve 43 and an outlet reflux valve 44; The pulse controller 41 is electrically connected to the plunger pump 42, the inlet of the plunger pump 42 is connected to the reflux pipe 3 for connecting one end of the faulty cable 5 through the inlet reflux valve 43, and the outlet of the plunger pump 42 is connected to the reflux pipe 3 through the outlet reflux valve 44, which is connected to one end of the storage component.

[0021] From the above description, it can be seen that the pulse injection device 4 generates pulses by controlling the plunger pump 42 by the pulse controller 41. The control process is simple, and the pressure and pulse frequency can be set on the pulse controller 41 to meet actual use requirements.

[0022] Further, it also includes a locking connector 9 for installation at the end of the faulty cable 5; The injection pipe 2 is used to connect one end of the faulty cable 5 and the return pipe 3 is used to connect one end of the faulty cable 5 and are respectively connected to the corresponding locking connector 9 pipes.

[0023] From the above description, it can be seen that by providing the locking connector 9, a closed environment can be formed between the equipment and the cable, thereby avoiding unexpected situations such as cable detachment and leakage of buffer layer ablation inhibitor during the reinjection process, thereby improving the stability of the injection process.

[0024] Furthermore, it also includes an on-off control member 10; The on-off control member 10 is provided between the injection pipe 2 and the corresponding locking connector 9 and between the return pipe 3 and the corresponding locking connector 9 .

[0025] It can be seen from the above description that the on-off control component 10 is used to control the on-off between the device and the cable, so as to deal with some unexpected situations and stop the injection immediately.

[0026] Furthermore, the pretreatment device 8 includes at least one of a heating module, a conductivity detection module, an impurity filtering module, a moisture detection module, a pressure detection module, a temperature detection module and an acid-base detection module.

[0027] From the above description, it can be known that the pretreatment device 8 can be a free combination of multiple functional modules, which can be specifically selected according to the material properties of the buffer layer ablation inhibitor used to improve the repair effect.

[0028] Please refer to Figure 4 A method for injecting a buffer layer ablation inhibitor into a high-voltage cable is applied to the above-mentioned device for injecting a buffer layer ablation inhibitor into a high-voltage cable, comprising the following steps: S1, connect the injection pipe 2 and the return pipe 3 to both ends of the faulty cable 5; S2. When the injection starts, the first flow direction control valve a, the injection control valve e and the return flow control valve c are opened, the high voltage generator 1 is started and the pulse injection device 4 is kept in a closed state, so as to realize constant current injection of the buffer layer ablation inhibitor from the storage component to the faulty cable 5, that is, enter the constant pressure injection mode; S3, when a blockage or abnormal pressure rise occurs in the pipeline, the reflux control valve c is closed, the pulse injection device 4 is started, and it is determined whether the first flow direction control valve a is closed. If so, the pulse injection mode is entered, otherwise the injection mode combining constant pressure and pulse is entered; S4. When the pipeline is no longer blocked or the pressure returns to normal, the pulse injection device 4 is turned off and the constant pressure injection mode is returned to.

[0029] From the above description, it can be seen that the beneficial effects of the present invention are: a constant pressure injection pipeline 2 loop is composed of a high-voltage generator 1, an injection pipeline 2, a return pipeline 3 and a storage component, and a pulse injection device 4 is added on this basis. By controlling the first flow direction control valve a, the injection control valve e and the return control valve c, the equipment can be flexibly switched from a constant pressure injection mode, a pulse injection mode or an injection mode combining constant pressure and pulse, so as to cope with blockage or abnormal pressure increase that may occur during the injection process, so that the injection process of the buffer layer ablation inhibitor is sufficiently stable and reliable to ensure the smooth completion of the repair operation.

[0030] Furthermore, it also includes: S5. In the constant pressure injection mode, the pulse injection mode or the constant pressure and pulse combined injection mode, the pretreatment device 8 is activated to treat the buffer layer ablation inhibitor in the tube.

[0031] From the above description, it can be seen that the pretreatment device 8 is arranged on the pipeline, so that the ablation inhibitor of the buffer layer can be pretreated during the injection process, thereby facilitating the detection of abnormalities, improving quality, etc.

[0032] Please refer to Figure 1 and Figure 2 , Embodiment 1 of the present invention is: A buffer layer ablation inhibitor injection device for a high-voltage cable comprises a constant pressure injection device and a pulse injection device 4; the constant pressure injection device comprises a high voltage generator 1, an injection pipeline 2, a return pipeline 3 and a storage component for storing the buffer layer ablation inhibitor; the high voltage generator 1 is connected to the air inlet pipeline of the storage component through a first flow direction control valve a, the liquid outlet of the storage component is connected to one end of the injection pipeline 2, the output port of the pulse injection device 4 is simultaneously connected to the return port of the storage component and one end of the return pipeline 3, and the return port of the pulse injection device 4 is connected to the other end of the return pipeline 3; an injection control valve e is provided on the injection pipeline 2, and a return control valve c is provided on the return pipeline 3, the other end of the injection pipeline 2 and the other end of the return pipeline 3 are respectively used to connect the two ends of a faulty cable 5, and a third flow direction control valve d is provided at the output port of the pulse injection device 4. In this embodiment, the high-voltage generator 1 has the functions of switch, automatic constant pressure and pressure regulation, and can use equipment that can generate sufficient working pressure, including but not limited to gas compressors, reciprocating pumps, rotary vane pumps, volumetric pumps, etc., and the working gas therein can be air, nitrogen, rare gas or other gases and mixtures thereof. As shown in the figure, the storage assembly includes a recovery storage tank 6 and an injection storage tank 7; the recovery storage tank 6 is connected to the injection storage tank 7 pipeline through the second flow control valve b, and the air inlet and the reflux port are both arranged on the recovery storage tank 6. The recovery storage tank 6 is used to store and recover the cable buffer layer 52 ablation inhibitor, and the buffer layer ablation inhibitor injected into the storage tank 7 is pressurized by the high-voltage generator 1 and then injected into the high-voltage cable. The buffer layer ablation inhibitor can be a liquid type or a solid-liquid mixed ablation inhibitor, such as a graphite suspension, a carbon black suspension, an ionic conductive liquid, etc.

[0033] At the same time, the device also includes a pretreatment device 8, which is arranged on the liquid outlet of the storage component and / or the reflux port of the storage component; the pretreatment device 8 is used to treat the buffer layer ablation inhibitor. Specifically, the pretreatment device 8 includes at least one of a heating module, a conductivity detection module, an impurity filtering module, a moisture detection module, a pressure detection module, a temperature detection module, and an acid-base detection module.

[0034] In this embodiment, a locking connector 9 is further included for installation at the end of the faulty cable 5; the injection pipe 2 is used to connect one end of the faulty cable 5 and the return pipe 3 is used to connect one end of the faulty cable 5 and are respectively connected to the corresponding locking connector 9. An on-off control member 10 is provided between the injection pipe 2 and the corresponding locking connector 9 and between the return pipe 3 and the corresponding locking connector 9.

[0035] As shown in the figure, the existing high-voltage cable includes a cable core 51, a cable buffer layer 52 and a cable corrugated aluminum sheath 53. For the faulty cable 5 in the high-voltage cable that needs to be subjected to buffer layer ablation inhibition, locking connectors 9 are provided at both ends of the faulty cable 5 for connecting the injection device and locking to ensure that the high-voltage cable is connected to the device of the present invention to form a closed environment. The on-off control part 10 is used to control the on-off between the faulty cable 5 and the buffer layer ablation inhibition device, and the buffer layer ablation inhibition device can fill the ablation inhibitor in the cable buffer layer 52 between the cable core 51 and the cable corrugated aluminum sheath 53.

[0036] Please refer to Figure 3 , Embodiment 2 of the present invention is: A buffer layer ablation inhibitor injection device for a high-voltage cable, based on the above-mentioned embodiment 1, a pulse injection device 4 includes a pulse controller 41, a plunger pump 42, an inlet reflux valve 43 and an outlet reflux valve 44; the pulse controller 41 is electrically connected to the plunger pump 42, the inlet of the plunger pump 42 is connected to one end of the reflux pipe 3 for connecting the faulty cable 5 through the inlet reflux valve 43, and the outlet of the plunger pump 42 is connected to one end of the reflux pipe 3 connected to the storage component through the outlet reflux valve 44. The plunger pump 42 preferably uses a double-plunger crankshaft plunger pump 42.

[0037] The peak value of the liquid inlet pressure of the pulse injection device 4 is between 1 and 1.5 MPa, preferably 1 MPa, and the pulse frequency is between 1 and 200 Hz.

[0038] Please refer to Figure 4 , Embodiment 3 of the present invention is: A method for injecting a buffer layer ablation inhibitor into a high-voltage cable, which is applied to a buffer layer ablation inhibitor injecting device of a high-voltage cable in Embodiment 1 or 2, comprises the following steps: S1, connect the injection pipe 2 and the return pipe 3 to both ends of the faulty cable 5; S2. When the injection starts, the first flow direction control valve a, the injection control valve e and the return flow control valve c are opened, the high voltage generator 1 is started and the pulse injection device 4 is kept in a closed state, so as to realize constant current injection of the buffer layer ablation inhibitor from the storage component to the faulty cable 5, that is, enter the constant pressure injection mode; S3, when a blockage or abnormal pressure rise occurs in the pipeline, close the reflux control valve c, start the pulse injection device 4, and determine whether the first flow direction control valve a is closed. If so, enter the pulse injection mode, otherwise enter the injection mode combining constant pressure and pulse; S4. When the pipeline is no longer blocked or the pressure returns to normal, the pulse injection device 4 is turned off and the constant pressure injection mode is returned to.

[0039] In this embodiment, for the mode switching process of steps S2 to S4, the present invention provides different implementation processes according to different purposes and needs of the work site: Implementation process 1: At the beginning, all valves and device switches are closed. At this time, the second flow control valve b is opened, and the inhibitor liquid in the recovery storage tank 6 is injected into the storage tank 7, and then the second flow control valve b is closed. At this time, the first flow control valve a, the reflux control valve c, the injection control valve e and the on-off control components 10 at both ends of the faulty cable 5 are opened, and the high-voltage generator 1 is turned on. Under constant pressure, the inhibitor liquid injected into the storage tank 7 is injected into the faulty cable 5 until the excess liquid overflows into the recovery storage tank 6 for collection; the first flow control valve a, the reflux control valve c, the injection control valve e and the high-voltage generator 1 are closed, and the on-off control components 10 at both ends of the cable are closed to stop the injection.

[0040] Implementation process 2: At the beginning, all valves and equipment switches are closed, the second flow control valve b is opened, and the inhibitor liquid in the recovery storage tank 6 is injected into the storage tank 7, and then the second flow control valve b is closed. At this time, the first flow control valve a, the reflux control valve c, the injection control valve e and the on-off control components 10 at both ends of the faulty cable 5 are opened, the high-voltage generator 1 is turned on, and the inhibitor liquid injected into the storage tank 7 is injected into the faulty cable 5 under a constant pressure state.

[0041] If a blockage and pressure increase occurs during the process, then: Adjust the pulse controller 41 to set the pressure and pulse frequency, open the third flow control valve d and the pulse controller 41 to generate pulses, close the return control valve c, and enter the constant pressure + pulse injection mode until the pressure returns to normal: Open the reflux control valve c, close the third flow direction control valve d and the pulse controller 41, and restore the constant pressure injection mode.

[0042] If excess liquid overflows during injection and is recovered in the recovery storage tank 6: Close the first flow direction control valve a, the return flow control valve c, the injection control valve e and the high-voltage generator 1, close the on-off control components 10 at both ends of the cable, and stop the injection.

[0043] Implementation process 3: At the beginning, all valves and equipment switches are closed. At this time, the second flow control valve b is opened, and the inhibitor liquid in the recovery storage tank 6 is injected into the storage tank 7, and then the second flow control valve b is closed. At this time, the first flow control valve a, the reflux control valve c, the injection control valve e and the on-off control components 10 at both ends of the faulty cable 5 are opened, and the high-voltage generator 1 is turned on, and the inhibitor liquid injected into the storage tank 7 is injected into the faulty cable 5 under a constant pressure state.

[0044] If a blockage and pressure increase occurs during the process, then: Adjust the pulse controller 41 to set the pressure and pulse frequency, open the third flow control valve d and the pulse controller 41 to generate pulses, close the return control valve c, close the first flow control valve a, and enter the pulse injection mode until the pressure returns to normal: Open the first flow direction control valve a and the return flow control valve c, close the third flow direction control valve d and the pulse controller 41, and restore the constant pressure injection mode.

[0045] If excess liquid overflows during injection and is recovered in the recovery storage tank 6: Close the first flow direction control valve a, the return flow control valve c, the injection control valve e and the high-voltage generator 1, close the on-off control components 10 at both ends of the cable, and stop the injection.

[0046] S5. In a constant pressure injection mode, a pulse injection mode or a constant pressure and pulse combined injection mode, the pretreatment device 8 is activated to treat the buffer layer ablation inhibitor in the tube.

[0047] In this embodiment, the pretreatment process of the pretreatment device 8 may include: heating the liquid to increase fluidity before injection, detecting the temperature, conductivity, and pH value of the liquid ablation inhibitor, and controlling the quality of the injected ablation inhibitor.

[0048] In summary, the present invention provides a device and method for injecting a buffer layer ablation inhibitor of a high-voltage cable, which has the following advantages: 1. By combining constant pressure and pulse injection devices, the buffer layer ablation inhibitor can be injected steadily at constant pressure. When blockage or pressure rises during the injection process, the device can be switched to a pulse injection device to clear the blockage and reduce subsequent injection pressure by pulse impact. After the injection pressure is restored, the device can be easily switched back to constant pressure injection for steady injection.

[0049] Second, since the pulse injection device and the constant pressure injection device are switched through pipes and valves, there is no need to remove the tooling when blockage occurs during the injection process, which greatly reduces the complexity of solving the blockage problem during operation and effectively solves the complexity and time-consuming problem of solving the blockage process during construction.

[0050] 3. It provides a solution for the inhibitor blocking process of high viscosity and high solid powder content, thereby expanding the range of choices for buffer layer inhibitors.

[0051] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A buffer layer ablation inhibitor injection device for a high voltage cable, characterized in that: It includes a constant pressure injection device and a pulse injection device; The constant pressure injection device comprises a high voltage generator, an injection pipeline, a return pipeline and a storage component for storing a buffer layer ablation inhibitor; The high-pressure generator is connected to the air inlet pipe of the storage component through a first flow direction control valve, the liquid outlet of the storage component is connected to one end of the injection pipe, the output port of the pulse injection device is connected to the reflux port of the storage component and one end of the reflux pipe at the same time, and the reflux port of the pulse injection device is connected to the other end of the reflux pipe; An injection control valve is provided on the injection pipeline, and a reflux control valve is provided on the reflux pipeline. The other end of the injection pipeline and the other end of the reflux pipeline are respectively used to connect the two ends of the faulty cable.

2. The buffer layer ablation inhibitor injection device for a high-voltage cable according to claim 1, characterized in that: The storage assembly includes a recovery storage tank and an injection storage tank; The recovery storage tank is connected to the injection storage tank pipeline through a second flow direction control valve, and the air inlet and the reflux port are both arranged on the recovery storage tank.

3. The buffer layer ablation inhibitor injection device for a high voltage cable according to claim 1, characterized in that: It also includes a third flow direction control valve, which is arranged at the output port of the pulse injection device.

4. The buffer layer ablation inhibitor injection device for a high voltage cable according to claim 1, characterized in that: It also includes a pre-treatment device, which is arranged on the liquid outlet of the storage component and / or the reflux port of the storage component; The pretreatment device is used for treating the buffer layer ablation inhibitor.

5. The buffer layer ablation inhibitor injection device for a high voltage cable according to claim 1, characterized in that: The pulse injection device includes a pulse controller, a plunger pump, an inlet reflux valve and an outlet reflux valve; The pulse controller is electrically connected to the plunger pump, the inlet of the plunger pump is connected to the reflux pipe through the inlet reflux valve for connecting one end of the faulty cable, and the outlet of the plunger pump is connected to the reflux pipe through the outlet reflux valve for connecting one end of the storage component.

6. The buffer layer ablation inhibitor injection device for a high voltage cable according to claim 1, characterized in that: Also included is a locking connector for installation at the end of a faulty cable; The injection pipe is used to connect one end of the faulty cable and the return pipe is used to connect one end of the faulty cable and are respectively connected to the corresponding locking connector pipes.

7. The buffer layer ablation inhibitor injection device for a high voltage cable according to claim 6, characterized in that: Also includes an on-off control component; The on-off control member is provided between the injection pipe and the corresponding locking connector, and between the return pipe and the corresponding locking connector.

8. The buffer layer ablation inhibitor injection device for a high voltage cable according to claim 4, characterized in that: The pretreatment device includes at least one of a heating module, a conductivity detection module, an impurity filtering module, a moisture detection module, a pressure detection module, a temperature detection module and an acid-base detection module.

9. A method for injecting a buffer layer ablation inhibitor into a high voltage cable, applied to a buffer layer ablation inhibitor injecting device for a high voltage cable as claimed in any one of claims 1 to 8, characterized in that: The steps include: S1. Connect the injection pipe and the return pipe to both ends of the faulty cable; S2. When the injection starts, the first flow direction control valve, the injection control valve and the reflux control valve are opened, the high voltage generator is started and the pulse injection device is kept in a closed state, so as to realize constant current injection of the buffer layer ablation inhibitor from the storage component to the faulty cable, that is, enter the constant pressure injection mode; S3, when a blockage or abnormal pressure rise occurs in the pipeline, the reflux control valve is closed, the pulse injection device is started, and it is determined whether the first flow direction control valve is closed. If so, the pulse injection mode is entered, otherwise, the constant pressure and pulse combined injection mode is entered; S4. When the pipeline is no longer blocked or the pressure returns to normal, the pulse injection device is turned off and the constant pressure injection mode is returned to.

10. A method for injecting a buffer layer ablation inhibitor into a high voltage cable according to claim 9, characterized in that: Also includes: S5. In the constant pressure injection mode, the pulse injection mode or the constant pressure and pulse combined injection mode, a pretreatment device is activated to treat the buffer layer ablation inhibitor in the tube.

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