76results about "Material breakdown voltage" patented technology

The invention discloses an electric spark nondestructive testing evaluation method for the integrity of a waterproof layer of a cable trench, and belongs to the technical field of nondestructive testing, and the method comprises the following steps: applying a multi-frequency electric signal through a preset moving electrode; the initial contact pressure of the moving electrode and the surface of the waterproof layer is obtained in real time, the pressure of the contact position of the moving electrode is adjusted, an electric spark signal generated at the defect position of the cable trench waterproof layer by a multi-frequency electric signal applied by the moving electrode is captured, and characteristic parameters of the electric spark signal are extracted to generate current electric spark characteristic data; utilizing the current electric spark characteristic data to distinguish defect types so as to generate a defect evaluation result; and outputting defect distribution information and triggering an acousto-optic alarm according to a defect evaluation result. According to the method, a detection mode of combining multi-frequency electric signal excitation and electric spark signal feature extraction and analysis is adopted, waterproof layer defect types can be distinguished, the severity of the waterproof layer defects can be evaluated, and the detection accuracy is improved.

The invention provides a test system and method for simulating in-situ reservoir electric detonation fracturing through gas-liquid coupling pressure application. The test system comprises a pressure chamber used for installing a test piece, a stress loading device, a gas-liquid coupling device and a high-voltage electric detonation fracturing device with a discharge electrode. A detonation hole is formed in the top of the test piece; the stress loading device is connected with the pressure chamber and is used for applying axial pressure and confining pressure to the test piece in the pressure chamber to simulate ground stress; the gas-liquid coupling device can inject water, gas, water and gas into the pressure chamber; and a discharge electrode of the high-voltage electric detonation cracking device can be arranged in a detonation hole of the test piece to crack the test piece. The device has the characteristic of being capable of applying axial pressure and confining pressure, controllable explosion energy can be achieved, coupling of multiple physical fields and high accuracy of energy output are guaranteed, and self-water injection, self-gas injection and up-down water pumping and draining are achieved through the gas-liquid coupling device; and accurate and in-depth research on the hole fracture development law, gas migration, permeability and the like after the in-situ reservoir high-voltage electric pulse technology is realized is facilitated.

The utility model relates to a glass-lined pressure vessel inspection device which comprises a telescopic rod and a multifunctional detection unit, one end of the telescopic rod is a detection end, and the other end of the telescopic rod is a handheld end; the multifunctional detection unit is fixed on the two sides of the detection end of the telescopic rod and comprises a glass lining coating thickness meter, an oxygen and explosion meter and a direct-current high-voltage detection probe rod electric brush; one side of the detection end is provided with the direct-current high-voltage detection feeler lever electric brush, and the other side of the detection end is provided with a glass lining coating thickness meter and an oxygen and explosion measuring instrument. Compared with the prior art, the device can detect various problems at the same time, improves the detection efficiency, and is simple in structure and convenient to carry.

The invention belongs to the technical field of generator stator coil materials, and particularly relates to a method and a system for evaluating aging resistance of a generator stator coil in a high-altitude environment. The method is based on research on service characteristics and evolution laws of a generator stator coil in a high-altitude environment; the aging resistance of the generator stator coil is evaluated through the following indexes for the first time: testing the breakdown voltage of the stator coil, the concentration of volatile organic compounds detected under the thermo-oxidative aging condition, the heat conductivity coefficient, the specific surface area of solid substances, the porosity and the liquid adsorption performance. The evaluation method provided by the invention has the advantages of accuracy and rapidness, and has a good application prospect.

This invention relates to the field of simulation verification device technology, and discloses an environmentally friendly insulating gas simulation verification device, including a housing with an internal cavity, and two shells disposed inside the cavity, each capable of rotating about its own central axis. The invention utilizes the rotation of the shells around their central axes to move a first and second protrusion along the central axis of the shells, causing them to protrude a certain distance from the surface of the shells. This results in an uneven electrode surface formed by the three components. By gradually adjusting the voltage and observing the current change between a pair of electrodes, the device can detect the voltage at which SF6 gas breaks down and loses its insulating properties. This design, which creates an uneven electrode surface, accurately reflects the usage scenario, ensuring the accuracy of the test results and enabling the safe use of SF6 gas.

The invention discloses a compatibility evaluation method and device of a transformer structure material and an insulating liquid, electronic equipment and a storage medium, and belongs to the technical field of electrical insulation detection.The method comprises the steps that compatibility evaluation indexes of the transformer structure material and the insulating liquid are obtained; index characteristics corresponding to the compatibility evaluation indexes are calculated; wherein the index characteristics comprise trend intensity, fluctuation characteristics and mutation characteristics; according to the index characteristics, calculating a weight coefficient corresponding to each compatibility evaluation index, according to the index value of each compatibility evaluation index and the corresponding weight coefficient, calculating a compatibility comprehensive score of the transformer structure material and the insulating liquid, and then according to the compatibility comprehensive score, determining the compatibility of the transformer structure material and the insulating liquid. Therefore, by implementing the method, the problem that the compatibility of the transformer structure material and the insulating liquid cannot be evaluated in the prior art can be solved.

Disclosed in the present invention are an aging performance influencing factor determination method and apparatus for a solid insulating material, a terminal device, a storage medium and an aging performance evaluation method. The aging performance influencing factor determination method comprises: on the basis of the number of aging performance influencing factors to be selected of a solid insulating material and the number of corresponding factor levels, determining an orthogonal experimental solution; acquiring the breakdown strength of the insulating material under different factor levels of each of said aging performance influencing factors, the breakdown strength being obtained by means of the orthogonal experimental solution; on the basis of the breakdown strength, calculating the significant effect value of each of said aging performance influencing factors; and comparing the significant effect value of each of said aging performance influencing factors with a preset significance level, and determining, as a selected aging performance influencing factor, an influencing factor the corresponding significant effect value of which is lower than the preset significance level. The present invention can be used to effectively reduce the number of factor determination experiments, thereby saving time and resources.

The utility model discloses an electric spark tetrafluoro material detection device, relates to electric spark detection field, including base and top plate, the bottom of base is provided with drive assembly, and the output end of drive assembly is provided with the sliding plate, the sliding plate is symmetrically provided with the clamping plate in sliding mode, the inside of clamping plate is rotatingly provided with the placing plate, the placing plate is provided with the clamping plate. A clamping plate is arranged on the base, a containing groove is formed in the clamping plate, a clamping sleeve is arranged on the clamping plate, an inserting rod is connected to the inner side of the clamping sleeve, a toothed rod is arranged in an interlayer of the clamping plate in a sliding mode, and an inserting hole matched with the inserting rod is formed in the toothed rod. The PTFE material is driven to slide upwards under the action of the air cylinder, the clamping plates clamp the two ends of the PTFE material in the process, and then the toothed bar is driven to slide downwards under the action of the insertion rod and the insertion hole, so that the bottom end of the PTFE material is completely exposed at the top of the detection assembly; and in the process, the PTFE material is quickly clamped.

The application discloses a lightning stroke event online guided wave monitoring method and device for a composite material structure, and comprises the following steps: arranging a plurality of piezoelectric sheets in a composite material structure to be monitored to form a sparse piezoelectric array; when the outer surface of the composite material structure to be monitored is struck by lightning, lightning impact force guided wave response mechanical quantities are excited, and the generated mechanical quantities are conducted to the piezoelectric sheets; the lightning impact force guided wave response mechanical quantities are converted into lightning impact force guided wave response signals; the lightning impact force guided wave response signals are transmitted to a data acquisition module through an online sensing mode; the lightning impact force guided wave response signals are subjected to direct current component removal and filtering pretreatment; and through a lightning impact force guided wave response signal imaging monitoring mode of the sparse piezoelectric array, lightning attachment point impact force passive imaging results are constructed. The lightning stroke event online guided wave monitoring method and device can not only improve the quality of lightning piezoelectric guided wave response signals, but also can perform high-precision positioning and imaging on lightning attachment points.

This invention discloses a method for testing the insulation strength of the inner surface of ceramics, belonging to the field of ceramic materials technology. The sealing component consists of a ceramic part and metal cover plates. An inner platform is provided on the inner wall of the ceramic part, and two metal cover plates are sealed to the inner platform with solder. An intermediate cavity is left between the ceramic part and the metal cover plates. During testing, measuring electrodes are first connected to the metal cover plates, and then the sealing component is placed in an insulating medium for power frequency withstand voltage testing. The initial test voltage starts from 30-90 kV, with a stabilization time of 1-2 minutes. The voltage is increased by 1-10 kV each time until the ceramic part breaks down at the surface. The ratio of the breakdown voltage to the height of the inner platform is used to obtain the insulation strength of the inner surface of the ceramic part. Because the distance between the inner and outer surfaces of the ceramic part is much smaller than that between the outer and outer surfaces, and the outer surface is immersed in the insulating medium, the inner surface breaks down preferentially during measurement, thus effectively measuring the insulation strength of the inner surface of the ceramic part.

For non-destructively measuring the yield strength of a metallic member using magnetic incremental permeability, a quasi-static excitation magnetic field is applied to two points of the metallic member, while a small alternating magnetic field generated by a transmitting coil is applied to the metal member. Intensity of the quasi-static excitation magnetic field applied to the metallic member is measured using a Hall sensor. The magnetic field induced by the magnetized metallic member is detected using a sensing coil. Using signals from the Hall sensor and the sensing coil, a reversible permeability (MIP) of the metallic member is obtained. A grain size of the metallic member is obtained from the relationship between the reversible permeability and the grain size of the metallic member, and the yield strength of the metallic member is calculated using the grain size. The grain size and yield strength of the metallic member can be measured non-destructively.

The invention relates to the technical field of cable manufacturing, and provides a multi-core PVC cable splitting and integrating device which comprises a pay-off system, a splitting and integrating system and a winding system. The pay-off system comprises a base, a plurality of pay-off racks and a plurality of driving parts; the pay-off racks are rotationally connected to one side of the base under the driving of the driving parts, and the multiple pay-off racks are arranged at intervals in the length direction and the width direction of the base; the separating and combining system comprises a rack, a first guide assembly, a dispensing assembly and a heating assembly; the first guide assembly is used for guiding core wires led out by the pay-off rack, the dispensing assembly is used for dispensing and fixing all the core wires, and the heating assembly is used for shortening the drying time of glue; and the winding system is used for winding the cable. On the basis, the microwave coaxial performance can be met, and meanwhile the requirement for manufacturing multi-core PVC cables of different lengths can be met. In addition, the invention further provides a manufacturing process of the multi-core PVC cable.

The application discloses a kind of for cable trench waterproof layer integrity electric spark nondestructive testing evaluation method, belong to nondestructive testing technical field, it includes by preset mobile electrode applies multi-frequency electric signal;Real-time acquisition mobile electrode and the initial contact pressure of waterproof layer surface, adjust the pressure of mobile electrode contact position, capture the electric spark signal generated by the multi-frequency electric signal applied by mobile electrode at the defect of cable trench waterproof layer, extract the characteristic parameter of electric spark signal to generate current electric spark characteristic data;Current electric spark characteristic data is used to distinguish defect type, to generate defect evaluation result;According to defect evaluation result, output defect distribution information and trigger sound light alarm.The application adopts multi-frequency electric signal excitation, electric spark signal feature extraction and analysis combined detection mode, can distinguish waterproof layer defect type, evaluate its severity, improve the accuracy of detection.

The invention discloses a hot-pressing defect detection method and system for a multi-layer anti-corrosion composite lining plate, and the method comprises the steps: putting the multi-layer anti-corrosion composite lining plate made of a PTEF plate, a PFA plate and a PET plate into a hot press, and executing a hot-pressing process; carrying out on-line electric spark detection and extracting key features from an on-line electric spark detection result; judging whether the multi-layer composite anti-corrosion lining plate has defects or not and the types of the defects according to the key features; automatically triggering a preset repair strategy or a high-level alarm according to a specific defect type after judging that the defect exists; and after the hot pressing process is finished, the multi-layer composite anti-corrosion lining plate is subjected to pressure maintaining and cooling to be below the preset cooling temperature, the multi-layer composite anti-corrosion lining plate is taken out and subjected to off-line comprehensive detection, and whether defects exist or not is judged again. The online quality monitoring system is integrated in the hot-pressing process, so that real-time quality feedback and process control are realized, zero defect of products is ensured, and the production efficiency is improved.

The invention discloses a ternary mixed insulating oil configuration evaluation device and evaluation method, and belongs to the technical field of transformer insulating oil evaluation. The evaluation device comprises a computer, an oil breakdown voltage detection device, an oil dielectric loss detection device, an oil viscosity measurement device, a device for detecting total hydrocarbon gas in oil and a heating device. The ternary mixed oil storage device is connected with each detection device; characterizing an insulating property state quantity through breakdown voltage, and characterizing a dielectric loss state quantity through dielectric loss; the viscosity state quantity is represented through the oil viscosity; the stable state quantity of the current ternary mixed insulating oil is formed through the total hydrocarbon content in the oil after breakdown; obtaining an evaluation coefficient according to the state quantity; according to the method, the interference of human factors is avoided, the evaluation result can reflect the configuration state of the ternary mixed insulating oil more actually, and the problem that the ternary mixed insulating oil prepared in different proportions cannot be comprehensively and systematically evaluated is solved.

A fluid electrical probe includes a body portion housing a cleaner, a head portion forming a gap, an electrode disposed in the gap, and a temperature sensor disposed in the gap. The cleaner is extendable into the gap to clean the electrode and the temperature sensor. The body portion comprises a handle configured to be gripped by an operator.

The application discloses a kind of parallel layer electrical strength test methods of fiber reinforced epoxy resin insulating pipe, comprising: obtaining the parallel layer sample of multiple fiber reinforced epoxy resin insulating pipes;On each parallel layer sample, a plurality of equal-diameter circular holes are uniformly opened;The parallel layer sample is placed in transformer oil, the transformer oil is heated to preset temperature, and the voltage is gradually increased to the circular hole of the parallel layer sample Breakdown;The median value of the voltage of the circular hole breakdown of multiple parallel layer samples is used as the value of the electrical strength of the parallel layer of the fiber reinforced epoxy resin insulating pipe.Solve the problem that the electrical strength of the fiber reinforced epoxy resin insulating pipe for ultra-high voltage electrical equipment is higher, and the existing standard specifies that the test method is difficult to effectively determine.

The invention discloses an electric weak point tester for testing a thin film under a high-temperature condition, and relates to the technical field of dielectric thin film performance detection. The testing of the electric weakness of the dielectric film at different temperatures can be realized, and the problem that the key performance evaluation method of the high-temperature-resistant dielectric medium is lacked is solved. The tester comprises two heating roller brackets, two driving roller brackets, a heating roller and a driving roller, the heating roller is erected between the two heating roller brackets; the driving roller frame is arranged between the two driving roller brackets; the heating roller is positioned obliquely above the driving roller; the film is arranged between the heating roller and the driving roller in a penetrating manner; the heating roller bracket can adjust the height of the heating roller so as to adjust the distance between the heating roller and the driving roller; the heating roller comprises a hollow shaft; two ends of the hollow shaft are erected on the heating roller bracket, an electric heating rod is arranged in the hollow shaft, and the heating roller is rotationally connected outside the hollow shaft; a graphite paper electrode is arranged outside the heating roller; the roller surface of the driving roller is connected with high voltage through an external electrode, and the graphite paper electrode is grounded through the external electrode.

The invention discloses a gear experiment device, a gear electric breakdown experiment method and a gear electric corrosion experiment method.The gear experiment device comprises a gear experiment mechanical mechanism which comprises a gear box and a gear assembly, an installation cavity is formed in the gear box, and the gear assembly is detachably installed in the installation cavity; the gear assembly comprises a first rotating shaft, a second rotating shaft and two gear samples, and the two gear samples are mounted on the first rotating shaft and the second rotating shaft respectively; the power mechanism is connected with the first rotating shaft; the load loading mechanism is connected with the second rotating shaft; the voltage loading mechanism is electrically connected with the first rotating shaft and the second rotating shaft; the oil supply mechanism communicates with the mounting cavity; and the data acquisition mechanism is electrically connected with the load loading mechanism and the voltage loading mechanism and is used for acquiring experimental data. The gear experiment device can accurately simulate the actual operation condition of the gear in the generator gearbox integrated system, and can carry out accurate electric breakdown and electric corrosion experiments on the gear sample.

The application relates to the field of electrical performance detection of insulating materials, in particular to a sample preparation method and a test method for crosslinking gel breakdown strength. The sample preparation method and the test method for crosslinking gel breakdown strength comprise the following steps: S1, preparing a vulcanized silicone rubber sheet with a thickness of 2 mm + / - 0.2 mm; S2, opening a round hole or a square hole in the center of the vulcanized silicone rubber sheet; S3, taking a hard smooth flat plate as a bottom plate, spraying a release agent, and placing the hole-opened vulcanized silicone rubber sheet in S2 on the bottom plate; S4, pouring unhardened gel liquid into the hole of the vulcanized silicone rubber sheet, and completing hardening according to the gel liquid hardening condition; S5, after the gel liquid is hardened, the vulcanized silicone rubber sheet and the gel are bonded together, the gel is supported, the vulcanized silicone rubber sheet is slowly taken off from the bottom plate, and the sample preparation is completed. The application can measure the breakdown strength of gels which are difficult to form.

The utility model discloses an accurate detection device for the continuity of a varnished wire paint film, and relates to the technical field of varnished wires. The tester comprises a tester body, one side of the tester body is fixedly embedded with a control panel and a display screen, one side of the tester body is rotatably connected with a plurality of conductive guide wheels, two sides of the tester body are respectively and fixedly provided with a pay-off assembly and a take-up assembly, and the pay-off assembly and the take-up assembly are consistent in structure and are symmetrically arranged. The take-up assembly comprises a mounting plate fixedly arranged on one side of the tester body, a movable seat rotatably penetrates through one side of the mounting plate, a plurality of uniformly distributed sliding grooves are formed in the outer wall of the movable seat, and sliding plates are slidably connected into the sliding grooves. According to the sample wire take-up device, an operator can conveniently and rapidly unload a wound sample wire, the time and energy of the operator are saved, winding drums of various specifications can be used for supporting, the sample wire can be paid off through the winding drums, the winding drums can be installed on the take-up assembly for take-up, and use is flexible and convenient.

The invention provides a line detection system. The line detection system comprises an unmanned aerial vehicle, a cable walking vehicle, a mobile imaging device and a control device, the unmanned aerial vehicle is used for transporting the cable walking vehicle to a to-be-detected line; the cable walking vehicle comprises a driving module, a guiding and supporting module, a hoisting and positioning module and a power supply module. The mobile imaging device comprises an X-ray imaging module and a driving module. And the control device is used for sending instructions to the unmanned aerial vehicle system, the cable walking vehicle and the mobile imaging device and receiving data returned by the unmanned aerial vehicle system, the cable walking vehicle and the mobile imaging device to obtain a detection result. The line detection system can realize overall regulation and control of the unmanned aerial vehicle, the cable walking vehicle and the mobile imaging device through the control device, so that integrated operation of directional delivery, autonomous advancing and accurate detection of the power transmission line is realized, and the detection efficiency of the power transmission line is improved.

The utility model discloses a defect detection device for a ceramic substrate. The defect detection device comprises a machine table, a vertical frame, a conveying table, a placement assembly, a detection assembly and an adsorption and extraction assembly, the vertical frame is fixedly mounted on the machine table; the conveying table is arranged on one side of the upper surface of the machine. The placing component is arranged on the other side of the upper surface of the machine; the detection assembly is arranged on the inner side wall of the vertical frame; the adsorption extraction assembly is arranged in the middle of the lower surface of the vertical frame and comprises two adsorption handles and a rotary lifting module; the rotary lifting module is fixedly connected with the joint of the two adsorption handles and used for controlling the two adsorption handles to move, so that when one adsorption handle moves between the conveying table and the detection assembly, the other adsorption handle moves between the detection assembly and the placement assembly. The utility model relates to the technical field of ceramic substrates, and can shorten the delayed time in the classification process of the detected ceramic substrates, thereby improving the detection rate and meeting the application requirements of batch detection.

This invention belongs to the field of electrolytic capacitor testing technology, specifically relating to a rapid testing device and method for the hydration resistance of low-voltage aluminum electrolytic capacitors. The device includes a reflux device comprising a base, an oil bath, a double-necked flask, and a serpentine condenser. A support rod is fixedly mounted on top of the base. A screw block is threaded onto the outer side of the support rod. A support rod is integrally formed on one side of the screw block, and a tray is integrally formed at one end of the support rod. The serpentine condenser is connected to the top of the double-necked flask, and a limiting block is integrally formed on the outer side of its upper end. The limiting block is in contact with the upper surface of the tray. This invention can simulate the long-term hydration failure process of capacitors in a short time, significantly reducing the testing time. It also precisely controls the shaking amplitude, avoiding problems such as flask cracking, seal failure, and uneven water distribution, thus improving testing safety, stability, and accuracy without changing the original testing and judgment standards, closely conforming to the actual aging and failure mechanism of capacitors.

The application discloses a lightning stroke piezoelectric wave online sensing method and device, comprising the following steps: arranging a piezoelectric sheet on the back of a composite material structure to be monitored; the front of the composite material structure to be monitored is subjected to a lightning stroke; the piezoelectric sheet converts a mechanical quantity of a lightning stroke wave response into a lightning stroke piezoelectric wave response signal, and transmits the lightning stroke piezoelectric wave response signal to an optical transmitter through a wire for short-distance transmission; the optical transmitter converts the lightning stroke piezoelectric wave response signal into a lightning stroke piezoelectric wave response optical signal, and transmits the lightning stroke piezoelectric wave response optical signal through an optical fiber for long-distance transmission; and an optical receiver receives the lightning stroke piezoelectric wave response optical signal, and converts the lightning stroke piezoelectric wave response optical signal into a lightning stroke piezoelectric wave response signal which is output to a data acquisition device. The lightning stroke piezoelectric wave online sensing method and device are adopted, the cathode of the piezoelectric sheet is short-circuited to the structure to be monitored, the resistive voltage generated in the conduction of the lightning current is avoided to cause damage of the sensor, and meanwhile, the quality of the lightning stroke piezoelectric wave response signal is improved.

The present application relates to the technical field of failure prediction, and particularly relates to an insulating oil aging failure early warning method, device, equipment and storage medium, the method realizes insulating oil aging failure early warning through four stages of model construction, data acquisition and prediction, curve analysis and early warning generation; the constructed breakdown voltage prediction model has strong generalization ability, can deeply analyze the nonlinear relationship of the absorption spectrum characteristics, is suitable for multiple insulating oil types at the same time, and has high prediction precision; through regular collection of absorption spectrum information, combined with real-time calculation of the breakdown voltage prediction model, the insulating oil aging state is continuously monitored, the hysteresis limitation of traditional offline detection is effectively broken through, dynamic tracking of the aging state is realized, and the failure risk of the insulating oil can be found in advance; through construction and analysis of the breakdown voltage change curve, the aging inflection point of the insulating oil can be recognized in advance, the failure risk is timely warned, the judgment result is intuitive and accurate, and the error caused by subjective experience is effectively avoided.

The invention discloses an insulating material dielectric strength evaluation method and system based on a trap level, belongs to the technical field of electrical equipment and electrical engineering, and is used for accurately evaluating the dielectric strength of an insulating material. The carrier mobility is calculated by collecting depolarization charge quantity attenuation curves of the insulating material after different polarization electric fields, the influence of the electric fields is corrected by adopting a Pole-Frenkel law, and trap level distribution of the insulating material under the different polarization electric fields is obtained. Through exponential decay function fitting, the influence of an electric field on a trap level is extrapolated to a higher electric field range, a corresponding limit trap level under a critical electric field is obtained, and a relation function with direct current breakdown field strength is established, so that the dielectric strength of the insulating material is accurately evaluated through the limit trap level.

The invention discloses a lubricating material electric corrosion test and quantitative analyzer and an analysis method thereof, and relates to the technical field of electric corrosion experiments.The device comprises a needle point electrode, a lubricating oil pool, a displacement driving mechanism and a circuit module, and the needle point of the needle point electrode vertically faces a metal sample. The geometric characteristic that the curvature radius of the tip of the needle tip electrode is extremely small is utilized, the discharge phenomenon is highly localized in a micro area below the needle tip, accurate positioning of the discharge position is achieved, and the problem of random distribution of discharge points on the surface of a ball electrode is solved; the high-precision displacement driving mechanism is used for precisely regulating and maintaining the micron-order gap between the needle point electrode and the metal sample, and the circuit module is combined to apply the pulse voltage with precise and controllable parameters, so that the consistency of the discharge energy and the action range of each time is jointly ensured; therefore, a single electric corrosion pit with determined position and highly repeated geometrical morphology can be prepared on the surface of the metal sample, and the core problems of strong discharge randomness and low morphology repeatability are effectively solved.

The application discloses a kind of deep cold temperature zone solid-liquid-gas three-state combination point insulating material flashover characteristic testing device, including test cavity, sample table, pressurization and current monitoring module, temperature control module, gas pressure control module and low-temperature liquid control module;Wherein, sample table is set in test cavity and connects sample table lifting device control test sample height, test cavity is used to provide low-temperature solid-liquid-gas three-state coexistence test environment, pressurization and current monitoring module is used to apply electric field on test sample surface and monitor current change, record flashover current waveform and protect circuit;Temperature control module is used to heat test sample single point and construct temperature gradient, and test sample different position temperature is monitored;Gas pressure control module is used to adjust gas phase environment gas pressure;Low-temperature liquid control module is used to regulate low-temperature liquid liquid level height.Can be carried out to insulating material in deep cold temperature zone solid-liquid-gas three-state combination point different low-temperature liquid, gas pressure, temperature gradient under insulating material surface direct current, alternating current and pulse flashover test.

The utility model discloses a cable accessory interface breakdown voltage testing device. The cable accessory interface breakdown voltage testing device comprises a conductor, a first shrinkage pipe, a second shrinkage pipe, a first electrode, a second electrode and voltage detection equipment. And the first shrinkage pipe wraps the outer wall of the conductor after being shrunk. And the second shrinkage pipe covers the outer wall of the first shrinkage pipe after being shrunk. The first electrode and the second electrode are arranged between the first shrinkage pipe and the second shrinkage pipe, and the first electrode and the second electrode are arranged at intervals in the axial direction. The voltage detection device is connected with the first electrode and the second electrode. According to the utility model, the interface breakdown voltage of the cable accessory can be rapidly, economically, effectively and accurately detected.