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1118results about "Environmental/reliability tests" patented technology

Reliability acceleration test method of electronic products

ActiveCN105572498ASolve engineering problems that are difficult to test and identify indicatorsSynthetic Stress Conditions for Growth TestsEnvironmental/reliability testsTemperature stressAcceleration factor
The invention discloses a reliability acceleration test method of electronic products, and belongs to the field of reliability designing and testing. The method comprises steps of firstly presetting an acceleration test temperature change curve boundary according to working stress limit obtained via a routine test for reliability of an electronic product, carrying out simulating calculation of temperature acceleration factors, and modifying and determining initial acceleration test temperature stress change curves; and secondly, calculating vibration acceleration factors according to the initial acceleration test temperature stress change curves and a test profile of the routine test for the reliability of the original electronic product, calculating acceleration test vibration stress change curves according to the vibration acceleration factors, and according to the acceleration test vibration stress change curves, determining the final temperature stress change curves and determining acceleration test time. According to the invention, by following the thought of testing and examining working stress of a product and properly increasing test stress level, test time is shortened; a reliability test of the electronic product can be accelerated; and diversity and controllability of the acceleration factors are achieved.
Owner:XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA

High-reliability pressure-adjusting automatic testing apparatus for fingerprint module group

The invention discloses a high-reliability pressure-adjusting automatic testing apparatus for a fingerprint module group. The automatic testing apparatus comprises a pedestal, a left support plate, a right support plate, a horizontal bridge plate, at least one horizontal objective table and a switching board installed on the horizontal objective table. The horizontal bridge plate is fixed between the respective upper ends of the left support plate and the right support plate. At least one lifting plate is arranged between the horizontal bridge plate and the horizontal bridge plate; and an inverted-T-shaped through hole is formed in the upper end of the lifting plate and is formed by a penetrating connecting hole and a rectangular through hole. A hanging plate is installed on the front end surface of the lifting plate; a plastic cavity box is installed at the lower end surface of the hanging plate; and a left cylinder, a right cylinder, and a testing pressing head seta are arranged in the cavity of the plastic cavity box respectively; and a testing pressing head for detecting an electrical performance of the fingerprint module group is fixed at the testing pressing head. According to the invention, the force applied on a product force can be adjusted and controlled; and products for testing are diversified. After testing by multiple times, the testing apparatus with the pressure applying tool can have a stable testing result; and testing results are consistent.
Owner:JIANGSU A KERR BIOLOGICAL RECOGNITION TECH CO LTD

Method for testing performance of different types of partial discharge detector mainframes based on analog voltage signal injection

The invention discloses a method for testing performance of different types of partial discharge detector mainframes based on analog voltage signal injection. A function generator with adjustable output frequency of 0-3.5 GHz and an adjustable output amplitude of 0-10 V is adopted in the method disclosed by the invention, and equivalent analog voltage signals generated by the function generator and based on partial discharge waveforms actually tested by a pulse current partial discharge detection sensor, an ultrasonic partial discharge detection sensor and an ultrahigh frequency partial discharge detection sensor are correspondingly and directly injected into the mainframes of a pulse current partial discharge detector, an ultrasonic partial discharge detector and an ultrahigh frequency partial discharge detector or through DC blocking elements with frequency bands of 10 kHz to 10 MHz. The method disclosed by the invention has the excellent advantages that the testing method is universal and standard, the testing result is reproducible and quantifiable, the range of application of testing objects is wide, the testing contents are comprehensive, and the like.
Owner:YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST +1

LED integrated driving power reliability analysis method based on accelerated performance degradation parameter

The invention relates to a reliability analysis method in the field of accelerated degradation testing, and in particular to a method based on accelerated degradation electrical parameter for analyzing the reliability of a LED integrated driving power within a LED entire light life cycle based on luminous flux. The method aims at using an electrical parameter to analyze the reliability of the LED integrated driving power so as to obtain the result of influence on the lifecycle of the entire lamp by the driving power. The reliability research for the driving power is based on design perspective. According to the invention, the method aims at addressing the problem of reliability analysis of the integrated driving power within the entire life cycle of the LED lamp, establishes a Wiener-based statistic model in accordance with the accelerated degradation electrical parameter, and conducts model parameter identification in combination with the maximum likelihood method and the MCMC method. The improved identification method reduces sampling requirements with the proviso of better protecting the identification precision by improving the identification method. And eventually, the method can provide a reliability index of the LED integrated driving power within the life cycle of the entire lamp in accordance with the constraints of the life cycle of the entire LED lamp based on luminous flux.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI

Transformer paper oil insulation multi-factor combined aging test device and life prediction method thereof

PendingCN108107291AReal-time online testAmount of performance degradation achievedTesting dielectric strengthEnvironmental/reliability testsExhaust valveVacuum extraction
The present invention relates to the technical field of transformer paper oil insulation aging test, especially to a transformer paper oil insulation multi-factor combined aging test device and a lifeprediction method thereof. The device comprises a test box body, a vibration transmission device, test sample clamping devices and an oil-way cycle device. The test box body is arranged on a bearingplatform, the test box body is internally provided with the plurality of test sample clamping devices arranged in parallel, the test sample clamping devices are connected with the vibration transmission device, a vacuum extraction opening, a cycle oil inlet and a cycle oil outlet are processed on the test box body, the cycle oil inlet and the cycle oil outlet on the test box body are connected with an oil-way cycle device through an oil-way cycle pipeline, the vacuum extraction opening on the test box body is provided with a vacuum pump through an exhaustion pipeline, and the extraction pipeline is provided with an exhaust valve. The transformer paper oil insulation multi-factor combined aging test device and the life prediction method thereof can achieve online detection of performance degradation amount of test samples, and employ a random model to combine a traditional life calculation model to predict the life of the transformer.
Owner:HARBIN UNIV OF SCI & TECH

Transformer simulative transportation testbed and application thereof

The invention relates to a transformer simulative transportation testbed and application thereof. The transformer simulative transportation testbed comprises a support, a rotary device, a swinging device and a sliding device, wherein the rotary device is mounted on the swinging device, and the swinging device is mounted on the support through the sliding device. When the testbed is used, a transformer is fixedly placed on the rotary device and is driven to rotate by the rotary device, when the swinging device works, the whole rotary device swings to enable the transformer to swing, vertical movement of the transformer can be driven through vertical sliding of the sliding device on the support, and through cooperative working of the rotary device, swinging device and sliding device, various transportation conditions of the transformer in the way of transportation can be simulated. A traditional single mode of simulating transportation conditions of a transformer is changed, various transportation modes in a transportation process of the transformer are simulated to be a whole, and the transportation conditions of the transformer can be truly reflected, thereby providing data reference for design of a transformer, and quality reliability of a transformer product can also be verified.
Owner:CETC NINGBO MARINE ELECTRONICS RES INST

Switch cabinet operation monitoring and evaluating system

The invention relates to the technical field of switch cabinets and provides a switch cabinet operation monitoring and evaluating system, which comprises an online monitoring module, an operation state evaluating module and a service life predicting module, wherein the online monitoring module is used for online monitoring partial discharge of the switch cabinet and carrying out current and historical query; the operation state evaluating module is used for evaluating the operation state according to the total historical discharge amount of the switch cabinet; the service life predicting module is used for evaluating the service life of the switch cabinet; and the online monitoring module, the operation state evaluating module and the service life predicting module are all connected with a main server. The switch cabinet operation monitoring and evaluating system has the beneficial effects that an ultrahigh frequency antenna is used for acquiring partial discharge signals of the switch cabinet, through filter amplification, recognition conversion and storage, problems of discharge signal attenuation and interference are solved, and accurate online monitoring on the partial discharge of the switch cabinet can be realized; according to the discharge data and the operation state data of the switch cabinet, the switch cabinet evaluation service life under a Weibull distribution model under a statistical characteristics-based fault tree can be obtained; and the system has a reasonable structure, the efficiency is high, and the application prospect is wide.
Owner:ZHAOTONG POWER SUPPLYING BUREAU OF YUNNAN POWER GRID

Automatic closed-loop detection method for relay protection

The invention provides an automatic closed-loop detection method for relay protection. The method comprises: information of a detected relay protection device is obtained, a test item is loaded, and atest plan is generated; whether alternating current and voltage zero drifts and linearity meet the requirements is checked; whether open-in and open-out operations are normal is detected; a GOOSE command is sent and a flexible pressing plate needed by the test item is invested or withdrawn automatically; a fault analog quantity SMV is adjusted automatically to meet the setting requirements of a protection setting value; whether a detected relay protection device acts correctly is determined; a next test item is carried out until all test items are completed; all tests are completed and then atest report is generated automatically. According to the invention, an automatic closed-loop detection method for relay protection is provided to solve problems that the existing on-site relay protection device detection method is not mature, has the low efficiency, and does not meet the field maintenance-free requirement. Therefore, the efficiency, safety, and standardization degree of the relayprotection detection are improved substantially; and the maintenance and operation efficiency and safety of the entire power system are improved.
Owner:YANCHENG POWER SUPPLY CO STATE GRID JIANGSU ELECTRIC POWER CO +2

Frequency domain and time domain-based condenser bushing insulation system aging state evaluation method

The invention discloses a frequency domain and time domain-based condenser bushing insulation system aging state evaluation method, apparatus, and device, and a computer-readable storage medium, including: separately performing PDC measurement on dry-type bushing and oil-immersed bushing individual insulation material samples, and dry-type and oil-immersed integral bushing models at different temperatures after aging processing is separately performed on the dry-type bushing and oil-immersed bushing individual insulation material samples, and the dry-type and oil-immersed integral bushing models; performing FDC measurement on the dry-type bushing and oil-immersed bushing individual insulation material samples, and the dry-type and oil-immersed integral bushing models at different temperatures and humidity; and effectively analyzing a bushing insulation material aging state according to a PDC measurement result and an FDS measurement result of the dry-type bushing and oil-immersed bushing individual insulation material samples and the dry-type and oil-immersed integral bushing models. The method, the apparatus, the device, and the computer-readable storage medium provided in the present invention can effectively avoid a loss caused by a bushing accident.
Owner:STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +1

Battery fire safety experimental system and experimental method using in situ measurement technology

InactiveCN107677966AIn situ measurement in real timeReal-time mechanical propertiesChemical analysis using combustionTesting electric installations on transportGas analysisBattery charge
The invention discloses a battery fire safety experimental system and experimental method using an in situ measurement technology. The battery fire safety experimental system and experimental method using the in situ measurement technology can be used for simulating the thermal disaster event when a battery is overheated, overcharged and loaded so as to preferably understand the thermal disaster characteristics of the battery and guide the battery safety design. The battery fire safety experimental system and experimental method using the in situ measurement technology can realize controllableand stable mechanical loading of the battery by taking a mechanical tester as a basic experiment platform, can realize overcharged and over-heated conditions of the battery on the same platform by means of expanded battery charge and discharge system and battery heating system, can utilize the in situ measurement technology to complete real-time monitoring of the stress, the strain, the calorificparameters, the temperature, the pressure, the infrared thermal imaging data, high speed imaging, and the gas analysis data, and can improve safety of the experimental system through an explosion-proof case.
Owner:BEIHANG UNIV

Device and method for testing current-carrying capacity of high-temperature superconducting tape or coil under multi-field coupling

ActiveCN110632425AImplement bridging relationshipsTroubleshoot coupled testing issuesMeasuring interference from external sourcesEnvironmental/reliability testsMulti fieldEngineering
The invention discloses an experimental device for testing the current-carrying capacity of a high-temperature superconducting tape or coil under multi-field coupling. The device comprises a loading system module, a low-temperature system module, a magnetic field system module and a measurement system module. The loading system module, the low-temperature system module and the magnetic field system module are used for comprehensively simulating the actual application environment of a superconducting wire. The measurement system module is used for measuring characteristic parameters of a superconducting wire or coil in states of temperature zone disturbance, magnetic field disturbance, and stress strain on the superconducting wire or coil. In addition, the invention also discloses a methodcomprising the following steps: acquiring a high-vacuum environment and a low-temperature environment and controlling a loading system to carry out stress loading on the high-temperature superconducting tape or the coil or controlling a magnetic field system to carry out magnetic field loading on the high-temperature superconducting tape or the coil; and controlling a constant current source to carry out current loading on the superconducting tape or the coil and recording the change of a nanovoltmeter. Therefore, a multi-field coupling test problem of the high-temperature superconducting tapetest is solved; and the domestic blank is filled.
Owner:CHINA INSTITUTE OF ATOMIC ENERGY

State test method of GIS equipment routine power failure cancelling experiment

InactiveCN106771929AShorten live detection cycleMaster the operating statusTesting using acoustic measurementsTesting using optic methodsElectricityMaintenance strategy
The invention provides a state test method of a GIS equipment routine power failure cancelling experiment. The method comprises the following processes that 1, a non-power-failure routine experiment is carried out according to the period requirement, and if an experiment result passes testing, the equipment state can be accurately grasped, and a corresponding maintenance strategy is directly formulated; 2, if the equipment state needs to be further analyzed, a non-power-failure diagnostic test is carried out pertinently according to the non-power-failure routine experiment and diagnostic test comprehensive evaluation result; 3, a corresponding maintenance strategy is formulated according to the non-power-failure routine experiment and diagnostic test comprehensive evaluation result. GIS equipment is subjected to electricity detection through multiple non-power-failure test items, the advantages of being comprehensive in acquired equipment state information amount, effectively covering main defects and faults and the like are achieved, many problems existing in existing polling and routine experience items are avoided, the GIS equipment operating state can be grasped accurately and conveniently in real time without power failure, the corresponding maintenance strategy is formulated, and safe and reliable operation of the equipment is guaranteed.
Owner:STATE GRID CORP OF CHINA +1

Testing circuit and testing method for temperature rise of IGBT module of frequency converter

The invention discloses a testing circuit and testing method for a temperature rise of an IGBT module of a frequency converter. With the circuit and method, problems that the testing time is long, the loss power is high, and testing is limited by equipment during temperature rise testing on the IGBT module of the frequency converter can be solved. A controller exerts a PWM pulse signal on a measured module and modulation factors and phase angles of each group of IGBT modules are changed, so that the control way is simple. Circulation of active units and passive units in a closed loop formed by a first group of measured IGBT modules, a second group of measured IGBT modules, and a load reactor can be realized, thereby realizing circulated flowing of the energy between the two groups of IGBT modules and the load reactor; and the power grid only provides the loss power part, thereby substantially reducing the testing cost. Moreover, a PLC monitors information of currents, voltages, temperatures and faults of the measured IGBT modules in real time. Only a direct-current bus needs to be connected externally and the controller and the load reactor can employ internal devices of the frequency converter, so that the testing requirements can be met easily; the occupied area is small; and the time for construction of the testing platform is short.
Owner:WUXI SILENT ELECTRIC SYST SES TECH CO LTD +1
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