77 results about "Core test" patented technology

The invention discloses a concrete temperature stress testing machine for compensating ambient temperature, which belongs to the technical field of concrete temperature strain test and comprises a testing machine host, a heat insulation box, a sealing sleeve, a water-cooling temperature control system and an active compensation system. Through the combination of the heat preservation box and the sealing sleeve, the concrete test block, the fixed-end universal joint, the movable-end universal joint, the fixed chuck, the movable chuck, the load sensor and other core test parts are sealed in the heat preservation box and the sealing sleeve, an independent internal constant-temperature test area is constructed, and the idealized premise that temperature changes of all the parts are consistent in the prior art is broken through; meanwhile, a water-cooling temperature control system composed of a first water cavity, a through groove, a second water cavity, a water injection pipe and a water drainage pipe is arranged among the first fixing base, the second fixing base and the sliding rod, it is ensured that the external temperature is constant, and the water-cooling effect is good. The problem of superposition of external deformation and deformation of the test piece and the internal part is thoroughly avoided.

The invention belongs to the technical field of high-power microwave effect tests in laboratories, and relates to a built-in conformal optical fiber electric field sensor array test system and method, and the method comprises the following steps: S1, preparing before implementation; s2, quick assembly and disassembly are carried out; s3, real-time measurement and closed loop are carried out; s4, a step of result confirmation and log uploading; s5, a step of preparing a next round of experiment; the technical scheme of the invention is mainly used for carrying out internal electric field distributed measurement on a fixed test body or a slide rail supported test body in a shielding cabin, a compact range or a GTEM room and other experimental environments; the system is composed of a conformal optical fiber electric field sensor array, an optical fiber link unit, a photoelectric integration module, a self-calibration unit, an energy source and an interface, can be assembled and disassembled within 5 min, can be repeatedly used for more than 100 times, remarkably reduces the operation cost of a laboratory, and provides a core test means for a high-precision, high-efficiency and low-cost anti-missile weapon HPM effect test.

The invention discloses a high-precision multi-interface collaborative FTU dynamic function test system and method. The system comprises a protection unit, a test bearing unit, a core test unit and a control system, the protection unit is composed of an acrylic transparent protection cover and a metal plate box body, and a test space is formed. The test bearing unit comprises a quickly replaceable carrier plate, an access structure and a positioning assembly, and the positioning assembly comprises a positioning pin and a guide block; the core test unit comprises a pressing plate structure, an endoscope and a test module; the test module is integrated with a key, a short circuit bolt, a network port, a DB9 and an aviation plug test module; the safety detection unit comprises a safety grating, an anti-pinch device and a pre-feeding induction mechanism, and the safety grating is arranged at the inlet of the test space; and the control system controls starting, execution and result uploading of the test process. The method is used for solving the technical problems of insufficient positioning precision, poor interface test collaboration, low safety protection reliability and limited automation and intelligence level in the existing FTU test.

The invention discloses a device for testing the sealing performance of a full-size sleeve-cement sheath-stratum combination of a hydrogen storage bank. Relates to the technical field of petroleum and natural gas drilling and production engineering, and is characterized in that the device comprises a sleeve-cement sheath-simulated stratum maintenance device for preparing the simulated stratum, an alternating load applying device and a sealing performance testing device; the method comprises the following steps: preparing a full-size simulated stratum through a maintenance device, constructing a'sleeve-cement sheath-simulated stratum 'integrated assembly by taking the full-size simulated stratum as a carrier, completing maintenance, and detecting the sealing integrity of the cement sheath after simulating the actual underground working condition; the simulation stratum capable of being used for testing the sealing performance of the cement sheath is prepared, the full-size simulation stratum serves as a core testing carrier, and quantitative evaluation of the sealing performance of the full-size cement sheath is achieved.

The invention provides a combined pressure core test fixture, and belongs to the technical field of pressure sensors, the combined pressure core test fixture comprises a pressing plate, a fixed seat, a shaping module, a signal transmission plate and a signal acquisition plate, the pressing plate is provided with a plurality of air outlets; the fixed seat is provided with a plurality of mounting grooves for mounting the pressure core bodies; the shaping module is installed in the fixed seat and located below the installation groove, the shaping module is used for being in butt joint with the bottom of the pressure core body, and the shaping module is provided with a penetrating-out hole for a pin on the pressure core body to pass through and a conical guide hole located in the end, close to the pressure core body, of the penetrating-out hole; a spring needle connected with a pin on the pressure core body is arranged on the signal transmission plate; and the signal acquisition board is conductively connected with the spring needles. The combined type pressure core body test clamp can avoid pin damage, guarantees sealing reliability and test data accuracy, and is suitable for synchronous test of pressure core bodies of multiple specifications.

The utility model discloses a universal testing device for a USB wire rod. The universal testing device comprises a PCB, a USB-A plug female seat group, a TYPE-C plug female seat group, a Micro plug female seat group, an LED lamp group and a switch, the USB-A plug female seat group, the TYPE-C plug female seat group, the Micro plug female seat group, the LED lamp group and the switch are electrically connected and are all arranged on the PCB; the USB-A plug female seat group, the TYPE-C plug female seat group and the Micro plug female seat group are all detachably connected to corresponding test ports on the PCB; the gears of the switch comprise a 2-core test gear, a 4-core test gear and a 9-core test gear, the gears of the corresponding types and the plug female seats of the corresponding types are selected according to the types of the to-be-tested wires, and whether the to-be-tested wires are abnormal or not is judged according to the lighting condition of the LED lamp set. And the abnormal condition of the wire core is judged by observing the lighting condition of the LED lamp group, so that the test convenience is improved, and the production cost is saved.

The utility model relates to the field of battery cell testing, and discloses battery cell charging and discharging testing equipment which comprises a supporting plate, a testing frame, a testing head, a heat dissipation frame and a heat dissipation assembly. The testing frame is fixedly arranged above the supporting plate, the testing heads are symmetrically arranged at the left end and the right end of the testing frame, the two testing heads can move close to or away from each other, and the heat dissipation frame is slidably installed at the bottom end of the testing frame. The utility model has the following advantages and effects: the battery is quickly mounted in the frame body through the mounting groove, a tester can quickly contact or separate the test electrode with or from the battery cell through the pressing plate, so as to realize the charge and discharge test on the battery cell, and after the charge and discharge test is finished, the heat dissipation cylinder can be driven to move through the pulling plate to quickly take out the battery cell, and meanwhile, the test efficiency is greatly improved. And the temperature generated by the battery cell can be quickly concentrated through the heat dissipation barrel, and is quickly cooled by the fan, so that relative normal temperature in the frame body can be kept in multi-batch measurement, and shutdown or influence on test data caused by over-high temperature is avoided.

An aeroengine core test device is used for the performance test of the core under a clean flow path, and includes a test stand, a cover plate, a first sealing structure and a second sealing structure. The test stand, the cover plate, the first sealing structure and the second sealing structure limit a closed cavity filled with lubricating oil around the journal of the core. The present invention provides a cavity for the front support bearing of the engine core to accommodate lubricating oil, which can protect parts, reduce the replacement workload during the test, and improve the test efficiency.

The invention discloses a visual test device for simulating high-temperature and high-pressure working conditions of a nuclear reactor core rod bundle channel prototype, the device is provided with a core test layer and a multi-stage depressurization layer, and a core test layer window on the side surface of the core test layer is sealed and insulated by using a sealing ring and an insulating spacer; an electric heating rod bundle is arranged in the core test layer; the multi-stage pressure reduction layer is formed by coaxially arranging a plurality of cylindrical pressure reduction layer windows outside the core test layer; circulating cooling water with stable pressure is respectively introduced into the core test layer and each pressure reduction layer, the pressure of each path of circulating cooling water is different, and the pressure difference of the two sides of each window is within the window material pressure bearing range; circulating cooling water in each pressure reduction layer is kept at a single-phase low temperature, so that visual observation is facilitated, and the temperature of the sealing material is ensured to be lower than the temperature resistance limit. According to the invention, the key technical problems of material strength limitation and thermal expansion mismatch in the high-temperature and high-pressure visualization test are solved, and a reliable test platform is provided for the high-temperature and high-pressure visualization of the reactor core rod bundle channel prototype.

The utility model discloses a hollow composite insulator for an ultrahigh-voltage large-capacity iron core test reactor, which comprises an insulating tube and an umbrella cover, the umbrella cover is of a sectional structure and is integrally formed on the insulating tube, annular grooves which are arranged at intervals are arranged on the outer wall of the insulating tube, tooth-shaped grooves are arranged on the groove walls of the annular grooves, and the tooth-shaped grooves are communicated with the umbrella cover. The two adjacent umbrella covers are arranged in the annular groove after being formed and spliced, and the two umbrella covers and the tooth-shaped grooves in the groove walls of the corresponding sides of the annular groove are solidified into a whole. According to the utility model, the outer wall of the insulating tube is provided with the annular groove, and when the umbrella cover is subjected to injection molding, part of silicone rubber flows into the annular groove and is solidified with the tooth-shaped groove to form a whole, so that the combination effect between the umbrella cover and the adjacent umbrella cover and between the umbrella cover and the insulating tube can be effectively ensured, and the sealing is ensured; and matched step surfaces are arranged at the joint of two adjacent umbrella covers, so that the combination effect is further ensured.

The utility model relates to the technical field of fixing devices, and discloses a fixing device for testing the magnetic performance of a transformer iron core, which solves the problems that the existing fixing device for testing the transformer iron core generally adopts an opposite-side clamping mode for fixing, the number of opposite-side clamping fixing points is small, and the positioning stability is poor. Supporting legs are fixedly installed at the four corners of the bottom of the workbench, a work frame is fixedly installed on one side of the workbench, an iron core body is arranged in the middle of the top of the workbench, two positioning rods are arranged on each of the four sides of the iron core body, and a supporting plate is arranged in the middle of the lower portion of the workbench. The four corners of the top of the supporting plate are fixedly connected with the bottom of the workbench through supporting rods, a driving motor is fixedly installed in the middle of the top of the supporting plate, and a transmission assembly is arranged at the output end of the driving motor. The transformer iron core test fixing device can position the four sides of the iron core, the number of clamping fixing points is large, and the positioning stability is improved.

The invention provides a method and a system for predicting the productivity of a mud pattern type shale horizontal well, and the method comprises the steps: firstly, obtaining nuclear magnetic logging data, core experiment analysis data, conventional logging data and test oil well data of target mud pattern type shale; then, geological dessert parameters and engineering dessert parameters are determined according to nuclear magnetic logging data and core experiment analysis data; wherein the geological dessert parameters comprise free hydrocarbon S1 of the target mud pattern type shale and the porosity corresponding to the condition that the nuclear magnetic transverse relaxation time is greater than 8ms; the engineering dessert parameters comprise the strength brittleness of the target mud pattern type shale. Thirdly, constructing a productivity index model according to the geological dessert parameters and the engineering dessert parameters; and finally, constructing a productivity prediction model for predicting the productivity of the target mud pattern type shale horizontal well according to the productivity index model and the test oil well data. By means of the method, the accuracy of productivity prediction of the mud pattern type shale horizontal well can be effectively improved, and therefore accurate prediction of the productivity of the mud pattern type shale horizontal well is achieved.

The present invention discloses a method and system for automatic testing of set-top boxes based on big data, mainly relating to the technical field of automatic testing of set-top boxes. It includes: collecting logs through a lightweight agent built into the device system and extracting log data information; cleaning the extracted data information through filtering rules to form a data set; using K-means clustering to extract behavior patterns from the data set after data cleaning and constructing a defect prediction model; dividing the extracted log data information into a training set and a validation set and training using the defect prediction model; generating core test cases and boundary test cases. The beneficial effect of the present invention is that it can achieve that the test cases are more in line with the real usage scenarios of users while dynamically optimizing the test strategy.

The present invention provides a method for determining a reasonable spacing of holes drilled in a hard roof pre-splitting by composite blasting, the method comprising the following steps: first, conducting a core test on the roof rock layer on site to obtain relevant physical and mechanical parameters thereof; second, establishing a numerical simulation model for shaped jet penetration based on the specifications of the perforating bullet to obtain the average velocity at the beginning of jet penetration, the maximum velocity of the head, and the time required for the jet to be formed and to start penetration; third, obtaining the length of the shaped jet penetration channel based on the quasi-steady theory of shaped jet; fourth, obtaining the attenuation coefficient and the geometric shape factor based on the stress intensity factor theory of fracture mechanics; fifth, obtaining the crack extension length under the action of the explosion stress wave and the crack extension length under the action of the explosive gas based on the fracture mechanics, the Griffith strength criterion, and the explosive blasting theory; and sixth, theoretically superposing and calculating the shaped jet penetration channel length and the crack extension length under the action of the explosion stress wave and the action of the explosive gas to obtain a reasonable spacing of holes drilled in a hard roof pre-splitting by composite blasting.

The utility model provides an atomization core testing device. The atomization core testing device comprises a bottom plate, a lifting assembly, a positioning assembly and a probe. The bottom plate is provided with a positioning groove used for keeping an atomizing core to be detected. The lifting assembly is arranged on the bottom plate and provided with a moving end capable of ascending and descending relative to the bottom plate. The positioning assembly is arranged at the moving end, and the positioning assembly is configured to move relative to the lifting assembly. The probe is connected to the positioning assembly, and the probe is configured to be capable of moving relative to the positioning assembly. And when the probe is in contact with the atomization core to be detected in the positioning groove, the probe can be aligned to a measurement position on the atomization core to be detected. According to the atomization core testing device, by adjusting the contact position and the contact pressure between the probe and the atomization core to be detected, the stability and the accuracy of atomization core testing are guaranteed.

The present invention relates to the technical field of geological exploration and geotechnical engineering testing, and specifically relates to a method for calibrating geological stratification parameters based on acoustic profiles and core tests, comprising the following steps: S1: Obtain the acoustic profile data of the target area and perform time-frequency domain preprocessing on the acoustic profile; S2: Divide the stratigraphic interfaces to generate an acoustic stratification profile with boundary markers; S3: Implement core sampling and perform three-dimensional CT scanning and mechanical parameter tests on the core samples; S4: Establish an acoustic velocity-mechanical parameter mapping relationship model and correct the transitional values of the interlayer parameters; S5: Construct a three-dimensional stratigraphic parameter matrix based on the corrected transitional parameter values and output a calibration report of geological stratification parameters with credibility indicators. With the present invention, by integrating acoustic profile and core test data, continuous calibration of stratigraphic mechanical parameters and credibility quantification are achieved, effectively improving the accuracy and reliability of geological stratification modeling.

The utility model discloses an emergency escape testing device relates to escape protection technical field, and this testing device includes test platform, test platform, the top of test platform is provided with the impact block main part, and the outer peripheral surface of impact block main part is provided with respectively first impact surface, second impact surface and third impact surface. This emergency escape testing device adopts rotatable multi -faceted impact block as core testing assembly, and its different surfaces are designed as plane, cambered surface, sharp surface and multiple forms, can accurate simulation emergency escape scene possibly encountered sharp rock, reinforced concrete block and other irregular obstacles, through the transmission and positioning of worm wheel and worm, can realize impact block rotation to switch different impact surface to can imitate the various sudden impact situation that may face in the escape process, such as the object impact that building collapse produces, escape passage obstruction object collision etc.

The application relates to a filter core high-temperature durability test device and relates to the technical field of filter core tests, which comprises an operation table, the surface of the operation table is provided with a steam pretreatment assembly and a filter core test assembly; the steam pretreatment assembly comprises a supporting table fixedly connected to the upper surface of the operation table, the upper surface of the supporting table is fixedly connected with a pretreatment cylinder, the inside of the pretreatment cylinder is provided with a filter screen cylinder, and a steam input pipe is fixedly embedded on the left side of the pretreatment cylinder; the filter core test assembly comprises a fixing seat fixed to the upper surface of the operation table, and the upper surface of the fixing seat is fixedly installed with a limiting shell through bolts. The steam pretreatment assembly and the filter core test assembly are integrated, the two are communicated through a steam guide pipe, the steam can be directly introduced into the filter core test structure after being pretreated, the actual use environment of the filter core under high-temperature working conditions can be simulated, precise and stable test conditions are provided for the filter core high-temperature durability test, and the reliability and reference value of test data are improved.

The invention belongs to the technical field of aerodynamic test equipment, and discloses an opening and closing device for ventilation and heat dissipation, and the opening and closing device is installed at the downstream of a core test area of the equipment. The ventilation door body is hinged and fixed to the door frame through a door body hinge, and the fixed door frame is fixed to an equipment backflow section wall plate. The output end of the driving system rod body is hinged and fixed to the ventilation valve body through a swing hinge, the fixed end of the driving system rod body is hinged and fixed to the fixing support through an installation hinged support, and the fixing support is fixed to an equipment wall plate. The opening and closing device controls the air exchange amount through continuous opening degree change to achieve air exchange heat dissipation and temperature regulation and control of the low-speed aerodynamic test equipment, and meanwhile cold air and hot air are fully mixed at the downstream of a core test area of the equipment, so that it is guaranteed that the uniformity of a core test airflow temperature field is prevented from being affected while airflow heat dissipation is guaranteed. The opening and closing device for ventilation and heat dissipation is simple in structure, safe, reliable and low in manufacturing cost and has engineering practical value.

The application discloses a transformer winding deformation tester and relates to the technical field of intelligent sensors. The transformer winding deformation tester comprises a storage box, and a winding voltage detection mechanism is fixedly connected to the top of the storage box. The transformer winding deformation tester is characterized in that, through the synergistic effect of an airflow mechanism and a cooling assembly, an electric sliding block pushes airflow in embodiment one, sand particles circulate and absorb heat in embodiment two, and water cooling circulation is implemented in embodiment three, a heat exchange channel is established between a ventilation pipe and a test component, heat generated in the detection process is directly led out, the continuous temperature rise of a core test area is significantly reduced, the active heat dissipation mechanism is utilized to solve the problem of precision attenuation caused by long-time operation, airflow circulation, sand particles and water flow carry heat, the internal temperature of the test component is maintained balanced, the electronic components are prevented from drifting due to overheating, the long-term reliability of winding deformation analysis results is ensured, and multiple-mode heat dissipation schemes are provided.

The embodiment of the application provides a kind of blade torsional rigidity and shear core test method, adjusting clamp, blade torsional rigidity test method includes: the blade root is fixed, and blade is in suspended state;Fixed clamp is set in the first position and the second position of blade, adjusting clamp is set in the loading position of blade, first position, second position and loading position are spaced apart along the length direction of blade, and loading position is located on the side of first position and second position away from blade root;Test load is applied to loading position by adjusting clamp;Test load and the rotation angle of loading position under test load are obtained;The torsional rigidity of blade is determined according to test load and rotation angle.In the test method provided in the application, not only the torsional rigidity of blade can be determined, but also the accuracy of test result can be ensured due to the setting of two fixed positions.

This invention provides a method and apparatus for generating test panels for simulation models, relating to the technical field of test tool generation. The method includes: acquiring information about the simulation model to be tested from a visual simulation modeling platform and verifying its editable state; calling the module retrieval interface of the visual simulation modeling platform, and, in conjunction with a user-defined search depth, retrieving all valid constant parameter modules and full-dimensional structured information from the model; constructing core test logic and generating script code based on a preset panel template, automatically converting it to an application designer-compatible format, and simultaneously generating a test architecture file; finally generating a visual interface containing a control panel, data observation area, and status information panel. This addresses many drawbacks of manually creating panels, improves development efficiency, adapts to different versions of application designers, and enhances the quality of model development and testing on the visual simulation modeling platform.

The application discloses a built-in magnetic three-dimensional bond-slip testing device and a mounting testing method thereof, which is used for testing the bond-slip and vertical peeling at the interface of a steel plate-concrete composite structure, is mounted on the inner side of the steel plate before pouring concrete, and comprises a steel shell and a core testing element in the steel shell, wherein the steel shell is magnetically sealed with the bottom of the steel plate; the core testing element comprises a hollow conduit, a sliding head, a pre-tightening spring and six arc-shaped steel belt strain gauges; the arc-shaped steel belt strain gauge comprises a pre-tightening arc-shaped steel belt and a resistance strain gauge attached to the pre-tightening arc-shaped steel belt, and six arc-shaped steel belt strain gauges are arranged in two groups along X, Y and Z directions, respectively, and are used for testing the slip amount along the X and Y directions and the peeling amount along the Z direction between the steel plate and the concrete. The application breaks through the defects of single testing direction and low testing dimension of the existing bond-slip testing, and significantly improves the feasibility of long-term monitoring of the interface damage of the composite structure.

The invention relates to a method for testing the flow conductivity of a multi-particle-size proppant, which comprises the following steps: carrying out sandstone core test on a core to obtain the triaxial mechanical strength, rock mineral components and microstructure of sandstone; preparing a simulated sandstone rock plate according to the obtained rock mechanical strength, rock mineral composition and microstructure; loading the rock plate into a flow guide testing device, and setting corresponding experimental parameters under a steam huff and puff injection-production condition; simulating multi-round steam huff and puff injection and production to obtain closing pressure data, fluid displacement data and flow guide chamber port pressure difference value data under the condition of the multi-stage particle size proppant; according to the closing pressure data, the fluid displacement data and the flow guide chamber port pressure difference data, the flow guide capacity of the proppant is determined through a flow guide capacity formula.

The invention provides an intelligent generation method and system for a test case of a power grid business management system, and the method comprises the steps: obtaining power grid business knowledge from a knowledge service pedestal of the power grid business management system through a knowledge retrieval module in an intelligent agent based on a test demand document; based on the power grid business knowledge and the test requirement document, a business rule analysis module of the intelligent agent is used for analysis to generate a core test point and a generation instruction; driving a large language model to generate an initial test case based on the core test point and the generation instruction; and sending a trigger event in the initial test case to a fault deduction engine for fault deduction, generating a potential fault chain, inputting the fault chain into a large language model to generate a derivative test case, and obtaining a target test case in combination with the initial test case. Professional knowledge and industry specifications in the power grid field can be deeply integrated, and the industry conformity of the test case is improved.

The invention provides a reactor core test piece, and relates to the field of nuclear power. The reactor core test piece comprises a simulation shell corresponding to the real shell; the simulation hanging basket shroud assembly corresponds to the real hanging basket shroud assembly and comprises a simulation hanging basket barrel body and a simulation shroud assembly, the simulation hanging basket barrel body and the simulation shroud assembly are located in the simulation shell and are fixedly connected with the simulation shell, the simulation hanging basket barrel body comprises a first hanging basket end, the simulation shroud assembly comprises a first shroud end, and the simulation shroud assembly comprises a second shroud end. The end part of the first shroud is sleeved with the end part of the first hanging basket; the simulation fuel assembly corresponds to the real fuel assembly, and at least part of the simulation fuel assembly is located in the simulation shroud assembly.

The application discloses a built-in three-dimensional bond-slip testing device and a mounting testing method thereof, which is used for testing the bond-slip and vertical peeling at the interface of a steel plate-concrete composite structure, is mounted on the inner side of the steel plate before pouring the concrete, and comprises a steel shell and a core testing element located in the steel shell, wherein the steel shell is sealed with the bottom of the steel plate; the core testing element comprises a hollow conduit, a sliding head, a pre-tightening spring and six string strain gauges; two of the six string strain gauges are arranged along three directions of X, Y and Z respectively, and are used for testing the slip amount along the X and Y directions and the peeling amount along the Z direction between the steel plate and the concrete. The application is based on a novel internal structure, breaks through the defects of single testing direction and low dimension of the existing bond-slip testing, can realize the repetitive and intermittent non-continuous testing of the interface slip damage, and significantly improves the feasibility of long-term monitoring of the interface damage of the composite structure.

The present application provides a kind of permeability tester of soil under dry-wet or freeze-thaw cycle effect, including static pressure loading device part and core test part, both parts are connected and fixed by support;Static pressure loading device part is composed of hydraulic device, hydraulic rod, main device, bottom pedestal and sliding groove;Core test part is composed of pressure rod, pressure measuring tube and plastic top plate, main device includes water storage pool and sample cylinder, water storage pool is composed of first baffle, second baffle, sample cylinder is composed of third baffle, fourth baffle;Second baffle and third baffle form vertical drainage layer, and water inlet is arranged on second baffle;Fourth baffle is provided with air hole;Bottom guide layer is arranged at the bottom of sample cylinder, resistance wire is built-in in vertical drainage layer and bottom guide layer;And drainage outlet is arranged;Ventilation opening and humidifier are arranged on second baffle, pressure rod includes first valve and second valve;Air outlet is arranged on plastic top plate;Barometer is installed on fourth baffle.

The embodiment of the present application discloses a kind of method for quickly determining tab spacing size, device and battery production system, for solving the technical problem of low efficiency and waste material in prior art, which needs to carry out core test paper and observe tab alignment condition multiple times to confirm the distance between tabs.The embodiment of the present application includes the following steps: S1, obtain the cross-sectional view of the winding core formed by the diaphragm and the tab of the full tab winding;S2, mark the preset tab position on the cross-sectional view of the winding core, then measure the cross-sectional view to obtain the distance between every two adjacent preset tab positions in the length direction of the tab.

The application discloses a handheld intelligent comprehensive tester for detecting a substation secondary circuit, which comprises a handheld shell, a display screen, a test connecting line, a wiring terminal area and an intelligent comprehensive test circuit. The display screen is arranged above the handheld shell. The wiring terminal area is arranged on the handheld shell and below the display screen. The test connecting line is used for connecting the substation secondary circuit to be detected and the handheld intelligent comprehensive tester. The intelligent comprehensive test circuit is arranged in the handheld shell and connected with the display screen and the wiring terminal area. The comprehensive tester integrates the core test functions of the substation secondary circuit into the intelligent comprehensive test circuit, realizes the rapid detection of the parameters of the substation secondary circuit by cooperating with the selection of the wiring terminal area, solves the pain points of the dispersion and complexity of the traditional test methods, improves the accuracy and safety of the test of the substation secondary circuit, reduces the operation and maintenance cost and guarantees the stable operation of the power system.