37 results about "Filled cable" patented technology

The invention discloses a piezoelectric circular tube transducer which comprises a piezoelectric ceramic circular tube. The pre-amplifier is arranged in the fixed structural member; the fixing structural member is filled with an elastic material so as to elastically fix the pre-amplifier; the fixed structural member is arranged in the piezoelectric ceramic circular tube, the fixed structural member is sealed at one end of the piezoelectric ceramic circular tube, and the other end of the piezoelectric ceramic circular tube is sealed by an end cover; the first metal lead terminal is inserted into the lead terminal jack of the fixed structural member, and a signal output lead of the pre-amplifier is electrically connected with the first metal lead terminal; a second metal lead terminal is inserted into a corresponding lead terminal jack of the fixed structural member, and a power supply lead of the pre-amplifier is electrically connected with the second metal lead terminal; an input lead of the pre-amplifier is connected with a positive electrode lead of the piezoelectric ceramic circular tube; and a negative lead of the pre-amplifier is connected with a negative electrode lead of the piezoelectric ceramic circular tube. External electromagnetic noise can be effectively isolated.

The utility model relates to an underwater oil leakage first-aid repair device applied to an oil-filled cable, and belongs to the technical field of cable first-aid repair, the underwater oil leakage first-aid repair device comprises an upper oil tank shell, a lower oil tank shell, an upper glue pouring shell, a lower glue pouring shell, a glue injection port, an oil discharge port and a sealing mechanism, the upper oil tank shell is arranged on the cable, the lower oil tank shell is detachably arranged on the upper oil tank shell, and the lower oil tank shell is detachably arranged on the lower oil tank shell. The upper glue filling shell flange is arranged on the upper oil tank shell, the upper glue filling shell is located at the cable oil seepage position, the lower glue filling shell flange is arranged on the lower oil tank shell, the glue filling opening is formed in the upper glue filling shell in a communicating mode, and the oil discharging opening is formed in the upper oil tank shell in a communicating mode. And the sealing mechanism is arranged on the lower glue filling shell and is used for sealing the upper glue filling shell and the lower glue filling shell. According to the invention, the problem that the marine environment is polluted due to the fact that the oil-filled cable is difficult to maintain underwater is solved.

The invention discloses an umbilical cable sealing end cover component and a submarine optical cable connector box, which are used for solving the problems of difficult assembly, poor sealing performance and insufficient pressure resistance of connection of an umbilical cable and an oil-filled cable in a deep sea environment. The end cover component comprises a connecting sleeve with a front cavity and a rear cavity, the rear cavity is provided with a tensile fixing assembly, axial stress is dispersed through slope self-locking, and a center pipe sealing assembly is installed to achieve high-pressure sealing through conical thread pressing. A two-stage outer sheath sealing assembly is arranged in the front cavity and is fixed by a sealing nut or a pressing piece; the optical fiber passes through the support to protect the steel pipe fiber outlet. According to the connector box, the outer cylinder body and the end cover part are rapidly assembled through the locking part, and the connector box is matched with an oil-filled cable end cover sealing part, so that multi-layer compression-resistant sealing, optimized stress distribution and stable optical signal transmission are realized.

This invention provides a water-filled cable trench and its laying structure, comprising: a main shell disposed in a mudflat section, the main shell having a receiving cavity; a wiring hole disposed on the main shell, the wiring hole communicating with the receiving cavity, through which the submarine cable passes through the main shell; and a water inlet disposed on the main shell, communicating with the receiving cavity, and the water inlet being located above the wiring hole. This design uses the main shell to form a receiving cavity for the submarine cable to pass through. During high tide, seawater submerges the main shell, and seawater enters the receiving cavity through the water inlet. The submarine cable passing through the receiving cavity is in direct contact with the seawater, which absorbs the heat emitted by the cable, thus aiding in heat dissipation. During low tide, the seawater leaves the mudflat section, but a certain amount of seawater remains in the receiving cavity. Therefore, the submarine cable remains surrounded by seawater and can still maintain effective heat dissipation through the seawater.

To provide a diagnostic method for highly accurately evaluating a degree of risk of abnormality occurrence of an oil-filled cable.SOLUTION: A diagnostic method includes: a step 1 of creating a trend graph; a step 2 of obtaining a maximum amount of copper dissolved in oil; and a step 3 of obtaining an amount of reduction from the maximum amount of copper dissolved in oil, and evaluates a degree of risk of abnormality occurrence from evaluation results of at least characteristic values (a) to (c) based on preset respective reference values in an oil-filled cable evaluated as in need of diagnosis. The diagnostic method has a step 1 of preparing a trend graph, and evaluates the degree of risk of the abnormality occurrence by evaluation results of evaluating at least characteristic values (f) to (i) based on respective preset reference values in the oil-filled cable evaluated as in need of diagnosis.SELECTED DRAWING: Figure 1

The application relates to the technical field of power cables, and particularly discloses a high-strength corrosion-resistant power cable and a preparation method thereof, which comprises a center tube made of ceramic silicone rubber and a sheath layer. In a normal working state, the conductor is in a dispersed state, the overall temperature of the cable during work is greatly reduced through the dispersed conductor, the working environment of the cable is combined, water flow and the dispersed conductor are mutually cooperative, the working state of the cable is further ensured to be low-temperature, the service life of the cable is greatly improved, the problem that the sheath layer is broken due to uneven expansion caused by cold and heat, and water enters the inside is avoided, when the cable works, the cavity is filled with insulating oil, the flowing cavity in the sheath layer is also filled with insulating oil through the communicating pipe, the insulating oil can fill the gaps in the inside of the cable, a liquid insulation layer is formed, the insulation performance of the cable is improved, and water and corrosive substances are prevented from invading.

The utility model relates to a photoelectric composite cable suitable for an unmanned aerial vehicle platform. The photoelectric composite cable comprises a wrapping layer formed by wrapping a covering film, an accommodating space is formed in the wrapping layer, a two-core electric unit and a one-core single-mode optical fiber are respectively placed in the accommodating space, and a plurality of aramid fiber filling cabling are distributed in the accommodating space; an insulating layer is distributed on the electric unit, an outer wrapping layer is distributed on the single-mode optical fiber, and the insulating layer, the outer wrapping layer and the covering film are all made of high-temperature-resistant fluoroplastic formed by ethylene-tetrafluoroethylene copolymer; the thickness of the covering film is 0.05 mm, and the total thickness after wrapping is 0.10 mm + / -0.02 mm; the outer diameter of the photoelectric composite cable is 2.2 mm + / -0.1 mm, and the total weight per meter is smaller than or equal to 12 g. Therefore, the whole photoelectric composite cable has better high temperature resistance, can meet high tensile strength under the condition of light weight, can realize low-loss signal transmission, and has better heat dissipation effect.

The invention relates to the technical field of high-voltage submarine cables, and discloses an oil-filled cable freezing span and freezing time control method which comprises the following steps: acquiring basic parameters such as a cable system, field working conditions and freezing conditions; for a given freezing span, acquiring key thermodynamic parameters based on the parameters, including radial thermal resistance, longitudinal thermal resistance, total heat capacity including latent heat of solidification and heat carried by oil flow; establishing a heat balance differential model for describing the temperature change of the freezing center point based on the thermodynamic parameters; and solving the model to obtain an expression that the temperature changes along with time, and deducing the freezing time corresponding to the given freezing span by setting the final temperature as an oil freezing point. According to the method, the thermodynamic model which introduces the experimental calibration correction coefficient is constructed and solved, so that accurate quantitative calculation of the freezing operation core parameters is realized, freezing failure is effectively avoided, and resource consumption is optimized.

Deep sea oil-filled cable connected pressure compensation pressure battery and compensation method, including a plurality of parallel arranged pressure battery module, the structure of a single pressure battery module is: including battery unit, its outside is provided with battery module pressure shell, insulation oil cavity is formed between the outer wall of battery unit and the inner wall of battery module pressure shell, insulation oil is injected in the insulation oil cavity, the compensation oil bag is installed in one end of the battery module pressure shell and communicates with the insulation oil cavity, the other end of the battery module pressure shell is connected with the oil-filled cable flange connector through bolt, the adjacent two pressure battery modules are connected by cable, the outside of the cable is provided with rubber hose, the energy supply of deep sea submersible at any depth is realized and the pressure compensation self-balancing is realized, the specific energy of the battery pack is improved, the deep sea submersible can carry more energy under the same conditions, the endurance and operation ability of the deep sea submersible are improved, and the pressure bearing reliability is high, and the battery safety is high.

The invention relates to the technical field of high-voltage cable operation and maintenance management, and discloses a method and a system for acquiring a temperature rise time constant of an oil-filled cable, and the method comprises the steps: building a current rising and temperature measuring system, an oil pressure and oil flow system and a temperature control system, synchronously regulating and controlling the current, oil flow rate, oil pressure and environment temperature of the oil-filled cable, and obtaining the temperature rise time constant of the oil-filled cable. And acquiring temperature data of the oil-filled cable, and calculating a temperature rise time constant after fitting. The system corresponds to the method. According to the invention, by synchronously controlling current, oil flow, oil pressure and environment temperature and simulating real scenes of the oil-filled cable under different operation conditions, the temperature rise rule of each part of the cable can be comprehensively captured, and by synchronously collecting temperature data of multiple parts, the temperature rise time constant can be accurately calculated, so that a reliable basis is provided for quantitative evaluation of the thermal stability of the cable; and the safety of the testing process is ensured through the design of a sealed heat preservation box, sealed thermocouple leading-out and a closed-loop oil flow loop.

The invention relates to an oil-filled-cable adapter comprising: a transition sleeve having an open end for connecting the oil-filled-cable adapter to an oil-filled cable, and a threaded end opposite the open end; a hose element, a first section of the hose element surrounding at least the open end; a first clamp which secures the first section of the hose element to the transition sleeve; and a second clamp for securing a second section of the hose element to the oil-filled cable. The invention also relates to an oil-filled cable which is connected to an oil-filled-cable adapter, and to a system for cleaning an oil-filled cable.

The invention relates to the technical field of cable terminals, and provides a stress cone and capacitance cone split type terminal device of an oil-filled cable and an installation method, and the terminal device comprises a stress cone and a capacitance cone which are split. The stress cone is formed by wrapping a plurality of paper tubes with different preset heights on site, the preset height of the paper tube on the innermost layer is the longest, and the preset height of the paper tube on the outermost layer is the shortest; the upper conical surface of the stress cone is an inclined surface and is tightly combined with the capacitance cone; the lower conical surface of the stress cone is a set stress curved surface, and the surface of the set stress curved surface is covered with a metal ground screen and is connected with a capacitance cone end screen and a cable lead layer. The capacitor cone is formed by rolling a whole piece of insulation paper, and a preset number of aluminum foils or capacitive screens are arranged every preset layers of insulation paper during rolling; and insulating oil is filled outside the stress cone and the capacitance cone to form an insulating filling area. The maintenance cost of the cable terminal is reduced, and the maintenance efficiency of the cable terminal is improved.

The utility model relates to the technical field of cables, and discloses a low-heat-release B2-grade polyvinyl chloride insulated cable for buildings, which comprises a plurality of conductors, insulating layers are fixedly connected outside the plurality of conductors, a same filling layer is fixedly connected outside the plurality of insulating layers, a wrapping tape is fixedly connected outside the filling layer, and the wrapping tape is fixedly connected outside the plurality of conductors. The outside of the wrapping tape is fixedly connected with an anti-puncture layer, the outside of the anti-puncture layer is fixedly connected with a buffer layer, and the outside of the buffer layer is fixedly connected with a sheath. According to the utility model, the conductors are isolated through the insulating layers to prevent current leakage and reduce heat release in case of fire, the filling layer fills gaps of the cable to enhance mechanical properties and heat dissipation, and the puncture-proof layer prevents the cable from being punctured, so that a stable and safe power transmission effect is realized, the safety risk in the power transmission process is reduced, and the fire hazard is reduced; the adaptive capacity of the cable in a complex environment is enhanced, and reliable operation of the cable in a building is guaranteed.

This invention discloses a method, equipment, and medium for simulating and calculating the surface temperature and conductor temperature of cables. The invention constructs a first temperature calculation model for cables operating under DC conditions and a second temperature calculation model for cables operating under AC conditions. Depending on the cable's operating condition, the surface temperature and conductor temperature of the cable are calculated in real time using either the first or second temperature calculation model. The calculated values ​​are then compared and verified using actual measured values ​​of the cable's surface and conductor temperatures. This invention constructs temperature calculation models corresponding to different operating conditions for cables, enabling dynamic simulation calculation of the internal conductor and surface temperatures of cables during load operation and power changes. The calculated values ​​are then compared and verified using actual measured values ​​of the surface and conductor temperatures, thereby achieving accurate temperature calculation and condition assessment for oil-filled cables.

The invention provides a conductor temperature measurement method and system, terminal equipment and a storage medium. The method comprises the steps that an optical fiber sensor is arranged in a conductor oil duct of a to-be-measured oil-filled cable in advance; wherein the optical fiber sensor comprises an optical fiber and a sensor probe, and the sensor probe is located at the tail end of the conductor oil duct; a pulse light signal with a preset wavelength is transmitted to the near end of the optical fiber sensor, so that the pulse light signal is transmitted to the sensor probe through the optical fiber; wherein the tail end of the oil-filled cable to be detected is provided with transmission isolation control equipment which is connected with the optical fiber sensor; acquiring a feedback light signal of the sensor probe based on the pulse light signal, and converting the feedback light signal into a real-time temperature value of the oil-filled cable to be detected according to a pre-calibrated light-temperature relation curve; wherein the light-temperature relation curve is a relation curve that the light intensity is attenuated along with time. According to the invention, the conductor temperature measurement accuracy under the application scene of the oil-filled cable can be improved.

The utility model provides a moisture-proof structure of an outdoor power distribution cabinet, which relates to the technical field of power distribution cabinets and comprises a power distribution cabinet bottom bin, limiting cylinders and limiting sleeves, a plurality of connecting holes are arranged at the bottom of the power distribution cabinet bottom bin, the limiting cylinders are arranged in the connecting holes, and the limiting sleeves are arranged at the tops of the limiting cylinders. A limiting mechanism is arranged between the limiting cylinder and the limiting sleeve; according to the utility model, the limiting sleeve is screwed into the top of the limiting cylinder, then the cable passes through the interiors of the clamping cylinder and the limiting sleeve, the limiting sleeve is continuously screwed to move downwards, and the conical groove at the bottom of the limiting sleeve is utilized to drive the top of the clamping cylinder to contract inwards, so that the cable can be clamped by the clamping cylinder for limiting the cable, and the cable passes through the interior of the supporting sleeve; the supporting sleeve made of rubber firstly expands outwards and then contracts inwards to be attached to the cable, the supporting sleeve can fill a gap between the cable and the bottom of the clamping cylinder, the bottom of the clamping cylinder is separated from the ground, and water vapor is prevented from invading the power distribution cabinet through the clamping cylinder.

The invention relates to the technical field of oil-filled cable repair, and discloses a plugging device and a plugging method. The shell part is assembled on a leakage section of the submarine cable, an isolation bin is formed outside the leakage section, and a male joint A and a male joint B are arranged outside the shell part; a leak repairing part; the leakage repairing part is assembled on the shell part through a male joint A and a male joint B, a leakage repairing medium is injected into the isolation bin, and seawater and insulating oil in the isolation bin are discharged through pressure until the isolation bin is filled with the leakage repairing medium to form plugging; according to the method, in-situ repair can be directly carried out on the leakage section underwater, the cable does not need to be salvaged, complex procedures such as cable salvage, cutting off and welding are omitted, the construction period is shortened, the equipment and labor cost is reduced, and meanwhile extra damage to the cable in the salvage process is avoided.

The invention discloses a power distribution box cable incoming and outgoing line sealing interface, which relates to the field of power distribution cabinet equipment, and comprises a power distribution cabinet body, a sealing opening, an outer ring sleeve arranged at the sealing opening, a taper sleeve body arranged in the outer ring sleeve, a sealing connection between the outer ring sleeve and the taper sleeve body through an elastic section, a filling body arranged between the outer ring sleeve and the taper sleeve body, and an adjusting piece arranged between the taper sleeve body and the outer ring sleeve. An inserting body is arranged in the taper sleeve body; the outer ring is sleeved with a sealing cover, the sealing cover is provided with a conical sleeve, the conical sleeve is provided with a plugging bag body, the conical sleeve is provided with a contraction ring, the contraction ring slides along the conical sleeve to extrude the plugging bag body, the conical sleeve is externally provided with a fixing piece, and the outlet sealing interface is of a multi-layer sealing structure under the synergistic effect of an internal adjustable conical sleeve body and an external compressible plugging bag body. The mechanical adjustment can actively change the hooping force on the cable bundle, and can fill irregular gaps between the cables in real time, thereby significantly improving the adaptability to different cable numbers, sizes and environmental changes.

The invention relates to the technical field of cable materials, and provides an oil-filled cable dynamic oil volume compensation amount metering method, device and equipment, and the method comprises the steps: building an oil volume compensation amount calculation model based on the variable quantities of a plurality of physical fields; acquiring a data signal acquired by a sensor and actual compensation oil flow data in a preset inspection period; inputting the data signal into an oil volume compensation amount calculation model to obtain an output result; and determining the operation state of the cable based on the output result and the actual compensation oil flow data. The method can accurately predict the dynamic oil volume compensation amount during the operation of the oil-filled cable, effectively judges the abnormality of oil flow, and improves the reliability of cable state monitoring.

The invention relates to a container (10) for a bacteria-containing liquid for cleaning an oil-filled cable (12), the container comprising an electric heating mat (30) which at least partially surrounds the container (10) from the outside. The invention also relates to a system for cleaning an oil-filled cable (12), the system comprising a container (10) and a pump (14) for pumping the bacteria-containing liquid from the container (10) into the oil-filled cable (12) and from the oil-filled cable (12) via an oil separator (16) back into the container (10).

The invention relates to the technical field of high-voltage cable tests, and provides an oil-filled submarine cable direct current flow test method and state judgment method and device.The method comprises the steps that first direct current is applied to an oil-filled submarine cable for a preset first duration, and the first direct current is equivalent to transient pressure generated by submarine cable dielectric loss heating; the transient oil pressure endurance capability of the oil-filled submarine cable after electrification is checked; increasing the first direct current to a second direct current for a preset second duration, which is equivalent to transient pressure generated by heating of the first power, so as to examine the transient oil pressure endurance capability of the oil-filled submarine cable under the first power; increasing the second direct current to a third direct current for a preset third duration, which is equivalent to the heating value of the cable under the second power, so as to check the operation capability of the oil-filled submarine cable under the second power; and reducing the third direct current to zero so as to examine the load shedding capability of the oil-filled submarine cable under the second power. According to the mode, on-site through-flow test can be carried out on the oil-filled submarine cable, and the through-flow capability of the oil-filled submarine cable can be checked.

Techniques described herein relate to systems and methods for obtaining a high temperature superconducting (HTS) cable assembly and filling the HTS cable assembly with a molten metal, such as solder.

The invention relates to the technical field of cable maintenance and pipeline plugging, and discloses an oil-filled cable freezing device capable of expanding an oil-filled cable chamber, which comprises a freezing main chamber, an oil-filled cable body is arranged in the freezing main chamber, and a standardized interface is arranged at the bottom of the freezing main chamber. The main freezing chamber is fixedly connected with a flange through a standardized interface, the main freezing chamber is fixedly connected with an auxiliary freezing chamber through the flange, a copper bottom plate is arranged in the main freezing chamber and surrounds the oil-filled cable body, and a liquid nitrogen conveying pipe with a nozzle is arranged in the copper bottom plate. An air guide opening is formed in the upper portion of the main freezing cavity, a cold guide pipe is fixedly connected into the auxiliary freezing cavity, and the auxiliary freezing cavity is fixedly connected with the air guide opening through the cold guide pipe. According to the invention, the working condition adaptability and deployment flexibility of the device are enhanced through modular design; and through cascade reuse of cold nitrogen, maximum utilization of cold energy is achieved, and high efficiency and economical efficiency are both achieved.

The utility model relates to the technical field of cables, and discloses a flexible combination cable, which comprises an outer protective sleeve, an armor layer is connected in the inner wall of the outer protective sleeve, a combination cable is arranged in the outer protective sleeve, and the combination cable comprises a conductive fiber layer, a static electricity removing layer and a flame retardant layer. Through the conductive fiber layer and the anti-static layer, the cable has a certain anti-static effect, fire caused by static electricity can be effectively prevented, the safety is improved, double protection is performed on the cable through the water-blocking layer and the water-blocking yarn, water permeation can be effectively isolated, the waterproof performance of the cable is improved more conveniently, and the cable is suitable for popularization and application. Compared with the prior art, excellent conductivity, shielding effectiveness and corrosion resistance are provided, the cable can meet the requirements of various different ranges, gaps in the cable are filled with polyurethane foam, the insulating layer is supported and protected, meanwhile, the polyurethane foam has certain heat insulation and flame retardant performance, and the overall performance of the cable can be improved.

The invention discloses a filling cable with water seepage self-positioning and crack self-repairing functions. The filling cable comprises an outer sheath, an insulating layer, a temperature sensing optical cable, a modified polypropylene filling rope and a conductor, wherein the insulating layer, the temperature sensing optical cable and the modified polypropylene filling rope are arranged in the outer sheath in a penetrating manner, and the conductor is arranged in the insulating layer in a penetrating manner; the modified polypropylene filling rope is prepared from the following raw material components: polypropylene, reduced iron powder, SAP resin, modified ammonia alkali white mud, modified zeolite, diatomite coated quick lime, a silane coupling agent and a PDMS hydrophobic additive. The outer sheath of the cable is filled with the modified polypropylene filling rope, the modified polypropylene filling rope is compounded with a water heating-expansion functional material system, the water seepage positioning and self-repairing functions are integrated into a single filling layer, and the temperature sensing optical cable is arranged to collect the temperature around a cable line in real time. In cooperation with an intelligent cable early warning host, management software and a visual interface, monitoring-positioning-repairing integrated active protection is realized.

The utility model discloses a support for power cable installation, which relates to the field of cable installation equipment and comprises a support body formed by a vertical connecting part and a transverse supporting part, the top of the supporting part of the support body is provided with a plurality of supporting grooves arranged at intervals, the inner walls of the supporting grooves are uniformly provided with bearing cones, and the top of each supporting groove is covered with a housing. A channel for a power cable to penetrate through is formed between the housing and the supporting groove, the inner wall of the housing is provided with a plurality of anti-skid pieces distributed at intervals, and the bearing cones on the inner wall of the supporting groove can lift the cable, so that a certain gap is reserved between the cable and the inner wall of the supporting groove, and the cable is prevented from being in direct contact with the inner wall of the supporting groove. The portion, located outside the supporting groove, of the cable is covered, the fixing effect of the cable is enhanced, the anti-skid piece is arranged on the inner wall of the housing, when the housing covers the supporting groove, the anti-skid piece makes contact with the cable and is extruded and deformed, the gap between the top of the cable and the housing is filled, and meanwhile the anti-skid piece extrudes the cable to generate friction force so that the cable can not slide outwards.

The invention discloses a heterogeneous conductor adaptive connection structure of an oil-filled cable and a crosslinked polyethylene cable, and relates to the technical field of high-voltage submarine cable connection, and the heterogeneous conductor adaptive connection structure comprises a conductor connector, an oil-filled cable side sleeve and a crosslinked polyethylene side sleeve; the oil-filled cable side sleeve comprises an oil-filled cable hollow main body, a diversion hole, a first-stage diversion structure, a second-stage axial straight-through structure and a hollow cylindrical interface; the crosslinked polyethylene side sleeve includes an XLPE cable solid body and a solid tapered interface. According to the invention, the problem of heterogeneous cable connection can be solved, and electrical connection and heterogeneous isolation of the oil-filled cable and the crosslinked polyethylene cable are realized; meanwhile, the form difference of heterogeneous conductors can be eliminated, the taper angle is optimized, and the contact reliability is improved; the circulation stability of insulating oil can be guaranteed, flow resistance is reduced through the mirror polishing technology, and the air gap discharge risk is eliminated; and the modular split type structure facilitates field maintenance, and can meet the requirements of mechanical strength and electrical performance under the deep sea high-pressure working condition.

The invention relates to a container (10) for a bacteria-containing liquid for cleaning an oil-filled cable (12), the container comprising a submersible pump (20) in the container (10), which submersible pump is designed to inject air or pure oxygen into the bacteria-containing liquid. The invention also relates to a system for cleaning an oil-filled cable (12), said system comprising a container (10) and a pump (14) for pumping the bacteria-containing liquid from the container (10) into the oil-filled cable (12) and from the oil-filled cable (12) via an oil separator (16) back into the container (10).

The application discloses a kind of for high-voltage cable air charging device, including the first clamping block and the second clamping block for interconnection cooperation to hold high-voltage cable, the middle part of second clamping block is equipped with inner hole, inner hole is equipped with the air-permeable insulating gasket, the clamping surface of second clamping block and high-voltage cable are equipped with sealing pad, the middle part of sealing pad is equipped with through hole to be used to make the hole on high-voltage cable with inner hole communication, fixed seat is installed on second clamping block, air nozzle is installed on fixed seat, and the inner cavity of air nozzle is communicated with inner hole, fixed seat is also equipped with sealing cover, and air nozzle is located inside sealing cover to be used to isolate inner hole and external air.The application can realize the limiting and reliable sealing for the hole on high-voltage cable, prevent high-voltage cable from being damaged due to hole, solve the sealing problem under humid operating environment, and improve the insulation strength of air charging device through air-permeable insulating gasket, without affecting the air permeability.

The invention discloses a cable surface temperature and conductor temperature simulation calculation method and device and a medium, and the method comprises the steps: constructing a first temperature calculation model of a cable under a DC working condition, and constructing a second temperature calculation model of the cable under an AC working condition; according to the working condition of the cable, calculating the surface temperature and the conductor temperature of the cable in real time by using a first temperature calculation model, or calculating the surface temperature and the conductor temperature of the cable in real time by using a second temperature calculation model; and comparing and verifying the calculated values by using the actual measured values of the surface temperature and the conductor temperature of the cable. According to the method, temperature calculation models corresponding to the cable are constructed according to different working conditions, dynamic simulation calculation of the internal conductor temperature and the surface temperature of the cable in the on-load operation and power change process of the cable is achieved, and calculation values are compared and verified by combining actual measurement values of the surface temperature and the conductor temperature; therefore, accurate calculation and state evaluation of the temperature of the oil-filled cable are realized.