A method for removing moisture from a buffer layer defect cable using xenon

Abstract

The application discloses a kind of buffer layer defect cable xenon gas removes moisture method, it is related to cable moisture removal technical field, including the following steps: when using, first determine cable buffer layer defect position, adopt waterproof sealing tape or silicon rubber sleeve Temporary sealing defect area and cable end, and install flange interface at cable both ends;60-80 ℃ dry xenon gas is injected into cable core from one end by flange interface with 0.3-0.5 MPa pressure, continues 30-60 minutes, when hernia flows, utilize internal moisture replacement of gas convection;While xenon gas is injected, the other end of cable is connected vacuum pump, and air is pumped out in two stages.The application controls xenon gas temperature and pressure gradient, avoids water vapor condensation, improves moisture replacement efficiency;Liquid water and gaseous moisture are pumped out in stages, to prevent moisture from being retained again;Synchronous processing defect and moisture problem, reduce the risk of secondary damp, significantly improve drying efficiency, suitable for the rapid maintenance of high-voltage cable.

Description

Technical Field

[0001] This invention relates to the field of cable moisture removal technology, and more particularly to a method for removing moisture from cables with buffer layer defects using xenon gas. Background Technology

[0002] Cables are made of one or more mutually insulated conductors and an outer insulating protective layer, which are wires that transmit electricity or information from one place to another. When the cable buffer layer is defective due to mechanical damage, aging or other reasons, moisture can easily seep into the core or insulation layer, leading to a decrease in insulation resistance, partial discharge or even breakdown. Therefore, it is necessary to remove the moisture inside the cable.

[0003] Existing methods for removing internal moisture from cables, such as hot air circulation or vacuum suction, are inefficient and leave residual moisture. Replacing the cable directly is costly and time-consuming, thus requiring improvement. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a xenon gas method for removing moisture from cables with buffer layer defects. Its advantages include: controlling the xenon gas temperature and pressure gradient to prevent water vapor condensation and improve moisture replacement efficiency; staged extraction of liquid water and gaseous moisture to prevent secondary moisture retention; and simultaneous treatment of defects and moisture issues to reduce the risk of secondary damping, significantly improving drying efficiency and making it suitable for rapid maintenance of high-voltage cables.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for removing moisture from a defective cable using xenon gas includes the following steps:

[0007] Step 1: When using the cable, first determine the location of the defect in the cable buffer layer, temporarily seal the defective area and cable end with waterproof sealing tape or silicone sleeve, and install flange interfaces at both ends of the cable.

[0008] Step 2: Inject 60-80℃ dry xenon gas into the cable core through the flange interface at a pressure of 0.3-0.5MPa for 30-60 minutes. During the gas flow, the internal moisture is replaced by gas convection.

[0009] Step 3: While injecting xenon gas, connect the other end of the cable to a vacuum pump and evacuate the gas in two stages:

[0010] First stage: Maintain a vacuum of 200-500Pa to drain the liquid water from the cable, and continue pumping until no more liquid water is drained.

[0011] Second stage: Increase the vacuum to below 100Pa to expel the gaseous moisture in the cable until the humidity sensor shows that the internal relative humidity is ≤5%;

[0012] Step 4: After drying, remove the temporary sealing material, repair any defects in the buffer layer, and seal the ends with a double-layer heat shrink sleeve for waterproofing.

[0013] The present invention is further configured such that, in step two, 60°C dry xenon gas is injected into the cable core from one end through the flange interface at a pressure of 0.3 MPa for 60 minutes. During the flow of xenon gas, the internal moisture is replaced by gas convection.

[0014] The present invention is further configured such that, in step two, 70°C dry xenon gas is injected into the cable core from one end through the flange interface at a pressure of 0.4 MPa for 40 minutes. During the flow of xenon gas, the internal moisture is replaced by gas convection.

[0015] The present invention is further configured such that, in step two, 80°C dry xenon gas is injected into the cable core from one end through the flange interface at a pressure of 0.5 MPa for 30 minutes. During the flow of xenon gas, the internal moisture is replaced by gas convection.

[0016] The present invention is further configured such that the location of the defect in the cable buffer layer is determined by infrared thermal imaging or partial discharge detection, the temperature difference in the defect area is ≤0.5℃, and the heating point dynamically migrates with load changes.

[0017] The present invention is further configured such that, during the vacuum suction, the humidity inside the cable is monitored in real time by a humidity sensor, and the relative humidity needs to be calculated after humidity monitoring. The formula for calculating the relative humidity is: Where RH represents relative humidity; Pw represents absolute humidity; and Pws represents relative humidity.

[0018] The present invention is further configured such that the formula for calculating the xenon gas pressure is: Where P represents the pressure data of the hernia; n represents the amount of gaseous substance; R represents the ideal gas constant; T represents the Kelvin temperature; and V represents the gas volume.

[0019] The present invention is further configured such that the defects in the buffer layer are repaired by using an epoxy resin composite tape or an elastomer coating.

[0020] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method described above.

[0021] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method.

[0022] The beneficial effects of this invention are as follows: the xenon gas method for removing moisture from defective cables in the buffer layer avoids water vapor condensation and improves moisture replacement efficiency by controlling the xenon gas temperature and pressure gradient; it extracts liquid water and gaseous moisture in stages to prevent secondary moisture retention; it simultaneously addresses defects and moisture issues, reduces the risk of secondary damping, and significantly improves drying efficiency, making it suitable for rapid maintenance of high-voltage cables. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the workflow of a method for removing moisture from a defective cable using xenon gas, as proposed in this invention. Detailed Implementation

[0024] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0025] The embodiments of this patent are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and should not be construed as limiting this patent.

[0026] In the description of this patent, it should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0027] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0028] Example 1:

[0029] Reference Figure 1 A method for removing moisture from a cable with a defective buffer layer using xenon gas, comprising the following steps:

[0030] Step 1: When using the cable, first determine the location of the defect in the cable buffer layer, temporarily seal the defective area and cable end with waterproof sealing tape or silicone sleeve, and install flange interfaces at both ends of the cable.

[0031] Step 2: Inject 60-80℃ dry xenon gas into the cable core through the flange interface at a pressure of 0.3-0.5MPa for 30-60 minutes. During the gas flow, the internal moisture is replaced by gas convection.

[0032] Step 3: While injecting xenon gas, connect the other end of the cable to a vacuum pump and evacuate the gas in two stages:

[0033] First stage: Maintain a vacuum of 200-500Pa to drain the liquid water from the cable, and continue pumping until no more liquid water is drained.

[0034] Second stage: Increase the vacuum to below 100Pa to expel the gaseous moisture in the cable until the humidity sensor shows that the internal relative humidity is ≤5%;

[0035] Step 4: After drying, remove the temporary sealing material, repair any defects in the buffer layer, and seal the ends with a double-layer heat shrink sleeve for waterproofing.

[0036] By controlling the temperature and pressure gradient of xenon gas, water vapor condensation is avoided, thus improving the efficiency of moisture replacement; liquid water and gaseous moisture are extracted in stages to prevent secondary moisture retention; defects and moisture problems are addressed simultaneously to reduce the risk of secondary damping and significantly improve drying efficiency, making it suitable for rapid maintenance of high-voltage cables.

[0037] Example 2:

[0038] Reference Figure 1 A method for removing moisture from a cable with a defective buffer layer using xenon gas, comprising the following steps:

[0039] Step 1: When using the cable, first determine the location of the defect in the cable buffer layer, temporarily seal the defective area and cable end with waterproof sealing tape or silicone sleeve, and install flange interfaces at both ends of the cable.

[0040] Step 2: Inject 60℃ dry xenon gas into the cable core through the flange interface at a pressure of 0.3MPa for 60 minutes. During the flow of xenon gas, the internal moisture is replaced by gas convection.

[0041] Step 3: While injecting xenon gas, connect the other end of the cable to a vacuum pump and evacuate the gas in two stages:

[0042] First stage: Maintain a vacuum of 200-500Pa to drain the liquid water from the cable, and continue pumping until no more liquid water is drained.

[0043] Second stage: Increase the vacuum to below 100Pa to expel the gaseous moisture in the cable until the humidity sensor shows that the internal relative humidity is ≤5%;

[0044] Step 4: After drying, remove the temporary sealing material, repair any defects in the buffer layer, and seal the ends with a double-layer heat shrink sleeve for waterproofing.

[0045] Example 3:

[0046] Reference Figure 1 A method for removing moisture from a cable with a defective buffer layer using xenon gas, comprising the following steps:

[0047] Step 1: When using the cable, first determine the location of the defect in the cable buffer layer, temporarily seal the defective area and cable end with waterproof sealing tape or silicone sleeve, and install flange interfaces at both ends of the cable.

[0048] Step 2: Inject 70℃ dry xenon gas into the cable core through the flange interface at a pressure of 0.4MPa for 40 minutes. During the flow of xenon gas, the internal moisture is replaced by gas convection.

[0049] Step 3: While injecting xenon gas, connect the other end of the cable to a vacuum pump and evacuate the gas in two stages:

[0050] First stage: Maintain a vacuum of 200-500Pa to drain the liquid water from the cable, and continue pumping until no more liquid water is drained.

[0051] Second stage: Increase the vacuum to below 100Pa to expel the gaseous moisture in the cable until the humidity sensor shows that the internal relative humidity is ≤5%;

[0052] Step 4: After drying, remove the temporary sealing material, repair any defects in the buffer layer, and seal the ends with a double-layer heat shrink sleeve for waterproofing.

[0053] Example 4:

[0054] Reference Figure 1 A method for removing moisture from a cable with a defective buffer layer using xenon gas, comprising the following steps:

[0055] Step 1: When using the cable, first determine the location of the defect in the cable buffer layer, temporarily seal the defective area and cable end with waterproof sealing tape or silicone sleeve, and install flange interfaces at both ends of the cable.

[0056] Step 2: Inject 80℃ dry xenon gas into the cable core through the flange interface at a pressure of 0.5MPa for 30 minutes. When the xenon gas flows, the internal moisture is replaced by gas convection.

[0057] Step 3: While injecting xenon gas, connect the other end of the cable to a vacuum pump and evacuate the gas in two stages:

[0058] First stage: Maintain a vacuum of 200-500Pa to drain the liquid water from the cable, and continue pumping until no more liquid water is drained.

[0059] Second stage: Increase the vacuum to below 100Pa to expel the gaseous moisture in the cable until the humidity sensor shows that the internal relative humidity is ≤5%;

[0060] Step 4: After drying, remove the temporary sealant, repair any defects in the buffer layer, and apply a double-layer heat shrink sleeve to waterproof the end.

[0061] In the above embodiments, the location of the cable buffer layer defect is determined by infrared thermal imaging or partial discharge detection. The temperature difference in the defect area is ≤0.5℃, and the heat point dynamically migrates with load changes, which facilitates rapid identification of the cable defect location and improves the accuracy of identification. The buffer layer defect is repaired by epoxy resin composite tape or elastomer coating to avoid the recurrence of defects in the cable buffer layer.

[0062] Furthermore, during the vacuum suction process, the humidity inside the cable is monitored in real time by a humidity sensor. After humidity monitoring, the relative humidity needs to be calculated. The formula for calculating the relative humidity is: Where RH represents relative humidity; Pw represents absolute humidity; Pws represents relative humidity; the relative humidity can be easily calculated using the above humidity calculation formula, which facilitates the judgment of the internal humidity of the cable. The formula for calculating the xenon gas pressure is as follows: Where P represents the pressure data of the xenon; n represents the amount of gas; R represents the ideal gas constant; T represents the Kelvin temperature; and V represents the gas volume. The above xenon pressure calculation formula can be used to easily control the pressure of the xenon and to easily obtain xenon injection of specific pressure values ​​into the cable core.

[0063] To verify the advantages of the xenon gas moisture removal method for buffer layer defective cables disclosed in the above embodiments over the prior art, a comparative experiment was conducted using multiple groups of buffer layer defective cables. The experimental data were recorded after the experiment, and the results are shown in the table below:

[0064]

[0065]

[0066] As can be seen from the table above, the technical solution disclosed in this invention significantly improves the insulation resistance, partial discharge, and internal humidity of the cable compared to the prior art, thereby significantly improving the drying efficiency of the cable and enhancing its maintenance effect.

[0067] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method described above.

[0068] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for removing moisture from a cable with a defective buffer layer using xenon gas, characterized in that, Includes the following steps: Step 1: When using the cable, first determine the location of the defect in the cable buffer layer, temporarily seal the defective area and cable end with waterproof sealing tape or silicone sleeve, and install flange interfaces at both ends of the cable. Step 2: Inject 60-80℃ dry xenon gas into the cable core through the flange interface at a pressure of 0.3-0.5MPa for 30-60 minutes. During the gas flow, the internal moisture is replaced by gas convection. Step 3: While injecting xenon gas, connect the other end of the cable to a vacuum pump and evacuate the gas in two stages: First stage: Maintain a vacuum of 200-500Pa to drain the liquid water from the cable, and continue pumping until no more liquid water is drained. Second stage: Increase the vacuum to below 100Pa to expel the gaseous moisture in the cable until the humidity sensor shows that the internal relative humidity is ≤5%; Step 4: After drying, remove the temporary sealing material, repair any defects in the buffer layer, and seal the ends with a double-layer heat shrink sleeve for waterproofing.

2. The method for removing moisture from a defective cable with a buffer layer using xenon gas according to claim 1, characterized in that, In step two, 60°C dry xenon gas is injected into the cable core from one end through the flange interface at a pressure of 0.3MPa for 60 minutes. During the flow of xenon gas, internal moisture is replaced by gas convection.

3. The method for removing moisture from a defective cable with a buffer layer using xenon gas according to claim 1, characterized in that, In step two, 70°C dry xenon gas is injected into the cable core from one end through the flange interface at a pressure of 0.4 MPa for 40 minutes. During the flow of xenon gas, internal moisture is replaced by gas convection.

4. The method for removing moisture from a defective cable with a buffer layer using xenon gas according to claim 1, characterized in that, In step two, 80°C dry xenon gas is injected into the cable core from one end through the flange interface at a pressure of 0.5MPa for 30 minutes. During the flow of xenon gas, the internal moisture is replaced by gas convection.

5. The method for removing moisture from a defective cable with a buffer layer using xenon gas according to claim 1, characterized in that, The location of defects in the cable buffer layer is determined by infrared thermal imaging or partial discharge detection. The temperature difference in the defect area is ≤0.5℃, and the heat points dynamically migrate with changes in load.

6. The method for removing moisture from a defective cable with a buffer layer using xenon gas according to claim 1, characterized in that, During vacuum suction, the humidity inside the cable is monitored in real time by a humidity sensor. After humidity monitoring, the relative humidity needs to be calculated. The formula for calculating the relative humidity is: Where RH represents relative humidity; Pw represents absolute humidity; and Pws represents relative humidity.

7. The method for removing moisture from a defective cable with a buffer layer using xenon gas according to claim 6, characterized in that, The formula for calculating the xenon gas pressure is: Where P represents the pressure data of the hernia; n represents the amount of gaseous substance; R represents the ideal gas constant; T represents the Kelvin temperature; and V represents the gas volume.

8. The method for removing moisture from a defective cable with a buffer layer using xenon gas according to claim 1, characterized in that, The defects in the buffer layer are repaired using epoxy resin composite tape or elastomer coating.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 8.

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