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52results about How to "Few measurement parameters" patented technology
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Method and device for testing heat transfer performance of fin surface of plate-fin heat exchanger
ActiveCN102135511AHigh measurement accuracyFew measurement parametersMaterial heat developmentMeasurement deviceLiquid medium
The invention discloses a method and a device for testing heat transfer performance of a fin surface of a plate-fin heat exchanger. The device comprises a heating container, a pump, a valve, a flow meter, an experiment sample, a cooler used for cooling liquid, a connecting pipeline, a liquid medium, a data acquisition instrument and a computer by which a circulation loop is formed. Heat transfer thermal resistance of one side is separated by testing the flow of the liquid medium passing through the heat exchanger and the temperature of four inlets / outlets in real time and utilizing the principle of equal surface thermal resistance of a high-temperature side and a low-temperature side and thermal resistance separation, and a functional relation between the high-temperature side and the low-temperature side is further obtained by calculating heat transfer coefficient h of the fin surface and flow Reynolds number Re according to structural parameters and serves as basic data for design and calculation of the heat exchanger; moreover, a functional relation obtained from new fins serves as a reference and a basis for comparing and judging mould abrasion, service life and mould repair and is simultaneously used for comparing performance difference among the fins with different structural parameters. The method has the advantages of few measurement parameters, simple measurement device and high measurement accuracy.
Owner:ZHEJIANG YINLUN MACHINERY
Availability evaluation method on retired dynamic lithium battery
ActiveCN104332666AFew measurement parametersSimple and efficient measurement methodElectrical testingSecondary cells servicing/maintenancePhysicsChemistry
The invention relates to an availability evaluation method on retired dynamic lithium battery. The method comprises the following steps: establishing core parameters for judging the availability of a retired dynamic single lithium battery; establishing the core parameter criteria of the retired dynamic single lithium battery; and establishing the proportion of the core parameter criteria of the retired dynamic single lithium battery; wherein the core parameters comprise residual battery capacity, safety, and cycle performance, the core parameter criteria comprise battery state of health (SOH), battery internal resistance, diaphragm penetration strength decreasing rate, diaphragm porosity, and secondary cycle life, and the diaphragm penetration strength decreasing rate and diaphragm porosity can be used to measure the diaphragm performance. The evaluation method has the advantages of less measurement parameters, simple and high efficient measuring method, and scientific and reliable evaluation result, and is capable of greatly improving the efficiency of screening on retired dynamic lithium batteries.
Owner:STATE GRID CORP OF CHINA +2
Moisture content measuring method for wood drying process and wood drying method
ActiveCN108802352AAccurate moisture contentReduce drying defectsWeighing by removing componentWood testingNarrow rangeSolid wood
The invention discloses a moisture content measuring method for a wood drying process and a wood drying method. The moisture content measuring method for the wood drying process and the wood drying method include: measuring an initial moisture content and initial weight of to-be-dried wood, and stacking the to-be-dried wood in a drying kiln; measuring temperature and wind speed of media flowing through two sides of the stacked to-be-dried wood, acquiring saturated vapor pressure of moist air according to dry-bulb temperature, acquiring relative humidity of the moist air according to temperatures of wet and dry bulbs, and finally acquiring density and moisture content of the moist air so as to obtain moisture contents of the to-be-dried wood at different times; according to the moisture contents of the to-be-dried wood, drying the to-be-dried word according to wood drying standards so as to obtain high-quality dry wood. The moisture content measuring method is precise, simple, low in input, applicable to any wood moisture content measurement, less in measuring parameters, simple in calculation, systematically stable, capable of overcoming the defects of large measuring error and narrow range of an electric measuring method and improving quality of solid wood plates, high in efficiency and low in cost.
Owner:BEIJING FORESTRY UNIVERSITY
Taper detection device
InactiveCN102042794AFew measurement parametersReduce measurement errorAngles/taper measurementsEngineeringAccuracy and precision
The invention relates to a taper detection device which comprises a mandrel device, wherein one end of the mandrel of the mandrel device is fixedly provided with an end disk, and the other end of the mandrel can be slidably sheathed in a movable disk the diameter of which is greater than that of the end disk; the movable disk is fixed with the mandrel through top threads; and the end surfaces of both the end disk and the movable disk are perpendicular to the mandrel. When the taper detection device is used for measuring the taper of a taper hole, the difference between the large and small diameters of the taper hole is fixed, thereby greatly reducing the measuring parameters and enhancing the measuring accuracy. The taper detection device provided by the invention is simple in structure and convenient in operation.
Owner:刘建新
System regional inertia evaluation method based on disturbance data
ActiveCN110943451AAccurate assessmentFew measurement parametersAc network circuit arrangementsClassical mechanicsTie line
The invention discloses a system regional inertia evaluation method based on disturbance data. The method comprises the steps: analyzing the frequency response characteristics of a disturbed power system when the power system is disturbed and the power is unbalanced, and obtaining key measurement parameters needed for evaluating the inertia of the power system; dividing the disturbed power systeminto a non-fault area and a fault area, and respectively calculating the inertia of the non-fault area and the fault area based on the key measurement parameters in the step 1; and further measuring the power and the frequency of each region on the tie line of each region after the disturbance of the power system, and evaluating the inertia of each region of the power system based on the measureddata. According to the method, the inertia level of the power system can be accurately evaluated, few parameters need to be measured and are easy to obtain, and the problem that the power unbalance amount is difficult to obtain in actual measurement is solved.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Residential architecture thermal performance integral evaluation method
InactiveCN101216441AReduce in quantityFew measurement parametersStructural/machines measurementMaterial thermal analysisOutdoor temperatureHeat transfer coefficient
An overall thermal performance evaluating method of residential buildings comprises the following steps of: detecting and acquiring indoor and outdoor dry-bulb temperatures of a residential building, solar radiation intensity, outer surface solar radiation absorption coefficient of an external wall, and air convection heat transfer coefficient of the outer surface of the external wall; calculating the synthetic outdoor temperature and constructing a computation formula for integrated evaluation, including thermo-friendly time in summer, thermo-resistance time in summer and thermo-resistance time in winder of the residential building to be evaluated; and comparing the results of the thermo-friendly time in summer and the thermo-resistance time in summer and in winter with the thermo-friendly time in summer and the thermo-resistance time in summer and in winter of green demonstration residential building and energy-saving demonstration residential building to overall evaluate the thermal performance of the residential building. The invention can overcome the disadvantages of the prior art that fails to overall evaluate thermal performance of the residential building and has the advantages of less measurement parameters, convenient operation and short evaluation duration time.
Owner:CHONGQING UNIV
Fowl egg mass center detecting method based on image
InactiveCN102628724AFew measurement parametersCalculation method is simpleStatic/dynamic balance measurementAnimal scienceImage based
The invention provides a fowl egg mass center detecting method based on an image, in particular a fowl egg mass center detecting method, which belongs to an object physical parameter detecting method. The method comprises the following steps of: shooting an image of a fowl egg when being placed in the horizontal plane in a balanced way by using a digital camera; analyzing the image by using a drawing software in WINDOWS system; and figuring out the position of the mass center of the fowl egg. The fowl egg mass center detecting method based on the image, provided by the invention, can be applied to dynamics analysis and fowl egg freshness detection in fowl egg grading treatment.
Owner:JIANGSU UNIV
Method for simultaneously measuring electro-optic coefficients Pockels and Kerr
InactiveCN102032946AFew measurement parametersMeasurement data is simpleAnalysis by material excitationPhotometry using electric radiation detectorsTriangular waveSurface plasmon wave
The invention provides a method for simultaneously measuring electro-optic coefficients Pockels and Kerr, belonging to the technical field of electro-optic measurement. In the method, surface plasmon wave is excitated by adopting prism coupling so that the energy of the incident light is coupled into the surface plasmon wave mode and the guided wave mode and the energy of the reflected light attenuates rapidly to form a series of resonance curves, namely attenuated total reflection (ATR) curves; and a triangular wave voltage is applied to modulate the incident light, the ATR curves slightly move horizontally, the intensity of the reflected light varies, and the coefficients Pockels and Kerr are solved through the variable quantity.
Owner:SHANGHAI JIAO TONG UNIV
Method for measuring steam-water mismatching amount of steam generator
ActiveCN101846535AAvoid inaccurate measurementsImprove securityIndirect mass flowmetersObservational errorNuclear power
The invention discloses a method for measuring the steam-water mismatching amount of a steam generator for a nuclear power station, which comprises the following steps of: (1) measuring water supply temperature TFW and water supply flow mFWM of water entering the steam generator to obtain actual flow mFW; (2) determining thermal power PW required by converting the water into steam; (3) determining thermal power PS generated by a loop of a reactor; and (4) determining steam-water mismatching amount (PW-PS). In the method, the actual water supply flow of the steam generator is corrected, and the steam-water mismatching amount of the flow is changed into the thermal power mismatching amount, so that the problem of inaccurate flow measurement caused by the change of temperature and pressure of the steam is solved fundamentally, the measurement error is reduced, and the safety and reliability of the nuclear power station are improved. The actual operation of the integral measuring method only needs the accurate measurement of the water supply flow mFWM and the water supply temperature TFW, and thus the method has the advantages of few required measurement parameters, convenient operation and high accuracy and feasibility.
Owner:JIANGSU NUCLEAR POWER CORP
Fowl egg mass center detecting method
InactiveCN102628723AFew measurement parametersCalculation method is simpleStatic/dynamic balance measurementAnimal scienceZoology
The invention relates to a fowl egg mass center detecting method, which belongs to the technical field of object characteristic parameter detection. The method comprises the following steps of: first, measuring maximum long axis diameter L of a fowl egg; weighing mass m of the fowl egg; fixing a special supporting piece at both big and small end points of the fowl egg by glues, wherein axis directions of the special supporting pieces are coincided with extension line of the maximum long axis diameter of the fowl egg; respectively placing the special supporting pieces on special supporting frames; keeping the supports in a horizontal state, wherein one special supporting frame is placed beyond a balance while the other special supporting frame is placed on an electronic balance; detecting mass m1 of the supporting point by the electronic balance; and calculating a distance J between mass center distance of the fowl egg and the small end point, wherein the calculation formula is J=Lm1 / m. The fowl egg mass center detecting method provided by the invention can be applied to dynamics analysis and fowl egg freshness detection in fowl egg grading treatment.
Owner:JIANGSU UNIV
Interference order-based high-birefringence optical fiber beat-length measuring method and measuring device
InactiveCN105675258AFew measurement parametersFew influencing factors of measurement accuracyOptical apparatus testingWavelengthBirefraction
The invention relates to the field of high-birefringence optical fiber parameter measurement, and particularly provides an interference order-based high-birefringence optical fiber beat-length measuring method and a measuring device. The calculation result of an existing beat-length measuring method is dependent on multiple measurement parameters, so that the calculation result of the existing beat-length measuring method is large in error. In order to solve the above problem, the invention provides the interference order-based high-birefringence optical fiber beat-length measuring method and the measuring device. The measuring method comprises the steps of A, measuring the length L of a to-be-measured high-birefringence optical fiber; B, constructing an interferometer, wherein the fast axis and the slow axis of the high-birefringence optical fiber form the phase difference of the interference light path of the interferometer; C, obtaining an interference spectrum, acquiring the wavelengths of two adjacent extreme values and calculating an interference order N corresponding to the wavelengths of the extreme values; D, according to a beat-length calculation formula, calculating the beat lengths of the wavelengths of different extreme values. The above measuring method is dependent on fewer parameters, small in measurement error and high in measurement accuracy. The measuring device is simple in structure and easy to implement.
Owner:ANHUI UNIVERSITY
Method and device for measuring saturated steam dryness through steam ejecting and extraction
ActiveCN104237307AHigh precisionNo heat transferMaterial moisture contentPressure systemWater volume
The invention belongs to the field of saturated steam dryness measurement and in particular relates to a method and device for measuring condensing type saturated steam dryness, wherein to-be-measured saturated steam can be introduced into a container filled with a certain amount of cooling water from a negative pressure system so as to perform mixed heat exchange. The to-be-measured saturated steam is introduced into the container filled with a certain amount of water so as to perform mixed heat exchange by using a steam ejecting and extracting device, the steam is condensed into water in the container, the heat is released, water level and temperature in the water tank are raised, and the total mass of the to-be-measured saturated steam is calculated based on increase of the water volume. Moreover, the heat released by the steam is calculated according to the water temperature change, the pressure of the saturated steam, the water level, the water temperature, the flow of superheated steam, the pressure and the temperature are measured, the various detected numerical values are transmitted to an upper computer, the dryness of the saturated steam is calculated by utilizing a heat balance equation, and the dryness of the saturated steam can be measured and displayed in real time.
Owner:BENGANG STEEL PLATES
Prediction model of blade moisture content based on dielectric properties and establishment method
ActiveCN108760838AEfficient measurementMeasurement time is shortMaterial capacitanceNon destructiveElectricity
The invention relates to a prediction model of blade moisture content based on dielectric properties and an establishment method, and belongs to the technical field of non-destructive testing. A LCR measuring apparatus is used to determine the dielectric parameters of a blade under an optimum frequency and voltage, and the dielectric parameters are substituted into the prediction model to calculate the blade moisture content. In order to overcome the shortcomings of traditional blade moisture content detection methods and provide a preliminary exploration and theoretical basis for the development of blade moisture content detection instruments, the influence of the frequency and the voltage of an applied electric excitation signal on the dielectric parameters of the blade are explored, theoptimum frequency and voltage are selected out, and based on the optimum frequency and voltage, the prediction model of the blade moisture content is established.
Owner:JIANGSU UNIV
Method for calculating volume and mass of egg on basis of line of apsides
InactiveCN102628683AEasy to rememberSmall amount of calculationWeighing apparatus for materials with special property/formAnimal sciencePackage design
The invention relates to a method for calculating a volume and mass of an egg on the basis of a line of apsides, which belongs to the calculation field of object physical parameters. The method comprises the steps of: firstly measuring a maximal long axis diameter L and a maximal short axis diameter B of an egg, and estimating the volume V of the egg by utilizing a standard ellipsoid volume calculation formula (PhiLB2 / 6); and estimating the mass m (RhoV) through the estimated volume, wherein Rho represents a density of the egg, and the density of an ordinary egg is 1.1 / cm<3>. According to the method, the volume of non-standard ellipsoidal egg is estimated by directly utilizing the standard ellipsoid volume calculation formula, so that fewer measuring parameters are involved, and the calculation method is simple; the standard ellipsoid volume calculation formula is similar to a sphere volume formula, so that the standard ellipsoid volume calculation formula is direct and clear for estimating the volume of the egg and is convenient to memorize; an egg volume model and an egg mass model based on a computer image processing technology can be favorably simplified, the calculation amount can be reduced, and simultaneously the throughput can be estimated; the kinetics analysis of a middle egg in staged treatment and establishment of a model can be facilitated; and the packaging design of the egg can be favored.
Owner:JIANGSU UNIV
Novel industrial robot RV reducer performance test method
InactiveCN108106840ASimple calculationFew measurement parametersMachine gearing/transmission testingElasticity measurementReduction driveReducer
The present invention relates to the technical field of industrial robot reducers, especially to a novel industrial robot RV reducer performance test method. The method comprises the steps of: (1) instrument zero setting; (2) forward loading to a rated torque; (3) forward unloading to a zero load; (4) backward loading to a rated torque; and (5) backward unloading to a zero load. The reducer revolution transmission precision error measure method is simple in calculation, few in measurement parameter and simple to obtain revolution transmission errors; and moreover, a test bed is high in measurement precision, simple in structure and easy to operate.
Owner:CHENGDU YUYA TECH
Method for measuring efficiency of independent condensing steam-driven induced draft fan
ActiveCN112302986AGet a complete look at performanceFew measurement parametersGeneral water supply conservationPump controlInlet pressureProcess engineering
The invention provides a method for measuring the efficiency of an independent condensing steam-driven induced draft fan. The method comprises a steam-driven induced draft fan, a small steam turbine,a condenser, a temperature measuring point, a pressure measuring point, a flow measuring point and the like. The steam-driven induced draft fan, the small steam turbine and the condenser are integrally researched, the exhaust enthalpy of the small steam turbine is calculated based on a thermodynamic method, and finally the efficiency of the steam-driven induced draft fan is obtained. The method has the advantages of few required measurement parameters, low measurement cost and small influence of measurement errors on results, and only needs to measure the dynamic pressure, static pressure andtemperature of inlet gas of the steam-driven induced draft fan, the static pressure and temperature of outlet gas of the steam-driven induced draft fan, the steam inlet pressure and temperature of thesmall steam turbine, the water inlet pressure, temperature and flow of circulating water of the condenser, the water outlet pressure and temperature of the circulating water of the condenser and thetemperature, pressure and flow of condensed water of a hot well. Therefore, the performance of the independent condensing steam-driven induced draft fan is comprehensively known, a reliable basis is provided for guiding the economical and safe operation of the steam-driven induced draft fan, and reasonable suggestions and improvement directions are provided for future economical operation.
Owner:XIAN XIRE ENERGY SAVING TECH +1
Permanent-magnetic electric machine inductance parameter measuring apparatus and method
ActiveCN101261294BAccurate measurementSimple structureResistance/reactance/impedenceDynamo-electric machine testingMeasurement deviceVoltage pulse
The invention discloses a simple testing method for testing the inductance of a direct axis and a quadrature axis of a permasyn motor, which has the following procedures that: any two phases of a stator are short-circuited, then a magnetic pole of a rotator is fixed in the position of an included angle of 0 degree or 90 degrees between the d axis of the magnetic pole and the phase of the stator which is not short-circuited by a simple rotator position adjusting mechanism; a voltage pulse signal is imposed on a series circuit which is formed by the non-short circuited phase of the stator and any other phase, the information of the whole current i which flows through the series circuit, the information of the voltage u at the two ends of the series circuit and the information of sampling time t are recorded, then the direct axis inductance and the quadrature axis inductance of the stator winding at the time t can be obtained after simple calculations. The simple testing method for testing the inductance of a direct axis and a quadrature axis of a permasyn motor also discloses a simple testing device for testing testing inductance of a direct axis and a quadrature axis of a permasyn motor. By using the techniques of the simple testing method for testing the inductance of a direct axis and a quadrature axis of a permasyn motor, a precise test of the inductance of a direct axis anda quadrature axis of a permasyn motor can be realized, and the calculation is simple, without occupying a great amount of calculating resources.
Owner:奇瑞新能源汽车股份有限公司
Any line remote elevation measurement method based on theodolite
InactiveCN106931939ATroubleshoot overhang height measurement issuesReduce limitationsHeight/levelling measurementTheodoliteVertical angle
The invention discloses an any line remote elevation measurement method based on a theodolite. A triangle solving principle is introduced into the remote elevation measurement of the theodolite; according to a horizontal angle and a horizontal distance of two points, which are convenient to measure, on the line, a vertical angle of a point to be measured and a horizontal angle of the point to be measured and a certain measured point, remote elevation of any point on the line is deduced: firstly, the horizontal angle and the horizontal distance of any two points of a power transmission and distribution line are measured; secondly, under a condition that the position of the theodolite is constant, the vertical angle of any point of the line and the horizontal angle with one measured point are measured; and finally, two projection triangles of a horizontal plane and one triangle of a plumb face where the point to be measured is positioned are solved to obtain the remote elevation of the point to be measured of the line. According to the any line remote elevation measurement method, two horizontal angles, one vertical angle and two sections of horizontal distances are measured to deduce the remote elevation of any point on the line, operation is simple, the problem that a box staff cannot be placed on the ground when the remote elevation is measured by the theodolite is effectively solved, and the applicable range of the theodolite is expanded.
Owner:STATE GRID HUBEI ELECTRIC POWER CO XIAOGAN POWER SUPPLY CO +1
Method for precisely calculating reduction ratio of reducer
ActiveCN105389416AAccurate reduction ratioThe solution process is convenient and easySpecial data processing applicationsReduction drivePulse number
The invention discloses a method for precisely calculating a reduction ratio of a reducer. The method comprises the following steps: determining a pulse number necessary for a servo motor of an input shaft of the reducer to run for a circle by a servo controller of the equipment, then, driving the servo motor to rotate for a circle by the equipment and obtaining data of an output shaft of the reducer, using a cyclic derivation method to calculate a cycle number when a condition is satisfied according to the obtained data, and finally, calculating the reduction ratio of the reducer by the obtained cycle number. By adopting the method disclosed by the invention, on the premise that the equipment is not dismounted, the reduction ratio of the reducer can be obtained quickly and precisely by a mathematic tool by detecting several parameters of the equipment.
Owner:GUANGZHOU MECHANICAL ENG RES INST
Harmonic source identification method based on weighted regularization extreme learning machine
PendingCN110443358AImproving Nonlinear Fitting CapabilitiesImprove recognition accuracySpectral/fourier analysisPhysical realisationVoltage amplitudeData set
The invention discloses a harmonic source identification method based on a weighted regularization extreme learning machine, and the method comprises the steps: carrying out the optimal configurationof measurement nodes of a power distribution network through employing a network topology method, and determining the number and installation positions of monitoring equipment; correspondingly forminga data pair according to the fundamental voltage amplitude, the harmonic voltage amplitude, the phase and the position vector of the bus where the harmonic source is located, which are obtained fromthe monitoring node, and forming a training data set and a test set of the harmonic source positioning estimator; and optimizing the activation function of the weighted regularization extreme learningmachine positioning estimator and the number of neurons in a hidden layer; and constructing a harmonic source positioning estimator by taking the amplitude and the phase vector of the obtained harmonic voltage as the input of a harmonic source positioning estimator model and taking the bus position vector of the corresponding harmonic source as the output, and identifying the harmonic source in the system.
Owner:ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER +1
Sensing system and sensing information determination method applicable to same
ActiveCN106918354ASimple structureSimple calculationThermometers using electric/magnetic elementsUsing electrical meansCapacitanceElectrical resistance and conductance
The invention provides a sensing system and a sensing information determination method applicable to the same. The sensing system comprises a sensing device and a sensing information determination device. The sensing device comprises an RC circuit, a signal monitoring circuit, a counting circuit and a crystal oscillator, wherein the RC circuit is formed by connecting a sensitive resistor and a capacitor in series, one end of the RC circuit is connected to a controlled switch, and the other end of the RC circuit is grounded; the controlled switch switches between preset voltage and a ground wire; the signal monitoring circuit is used for monitoring reset signals outputted in a charging period of the RC circuit; and the counting circuit is used for counting the period of clock signals in a non-reset period. The sensing information determination device comprises a control unit and a sensing information determination unit, wherein the control unit is used for monitoring voltage outputted by the RC circuit in a capacitor charging period and enabling a capacitor to discharge when the monitored capacitor is fully charged; and the sensing information determination unit is used for calculating sensing information corresponding to a periodic number provided by the counting circuit in a discharging period according to a pre-calibrated periodic number related with the measuring range. The sensing system provided by the invention effectively simplifies the hardware and reduces the computation burden.
Owner:SHANGHAI IND U TECH RES INST
A Method of Inertia Evaluation Based on Disturbance Data
ActiveCN110943451BAccurate assessmentFew measurement parametersAc network circuit arrangementsClassical mechanicsTie line
The invention discloses a method for evaluating the inertia of a system in different regions based on disturbance data. When a disturbance occurs in a power system and power imbalance occurs, the frequency response characteristics of the power system after the disturbance are analyzed to obtain key measurement parameters required for evaluating the inertia of the power system. ; Divide the disturbed power system into non-faulty areas and faulty areas, and calculate the inertia of non-faulty areas and faulty areas based on the key measurement parameters in step 1; Frequency, and based on the measured data, the inertia of each area of the power system is evaluated. This method can accurately evaluate the inertia level of the power system, and the parameters required to be measured are few and easy to obtain, which solves the problem that the power unbalance quantity is difficult to obtain in actual measurement.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Method, system, device and mixer for measuring volume of agglomerates in mixing tank
InactiveCN101655385BFew measurement parametersImprove measurement accuracyVolume measurement apparatus/methodsWeighing apparatus for materials with special property/formMixing tankMaterials science
Owner:SANY HEAVY IND CO LTD (CN)
Identification method of single-phase ground fault point in non-effectively grounded distribution network
ActiveCN110058127BLow installation and maintenance costsSimple calculationFault location by conductor typesBusbarFeeder line
The invention discloses a single-phase grounding fault point identification method of an ineffectively grounded distribution network, which belongs to the electrical field. The identification method includes: determining all suspected fault points of the single-phase ground fault according to the topological structure of the non-effectively grounded distribution network; calculating the fault phase voltage V of the substation end busbar of each suspected fault point Si :V Si =(I L +I f )·D i1 ·Z+(I i +I f )D i2 ·Z+I f · R f , among them, I L is the total load current of the feeder fault phase before the actual measurement, I f is the fault current, I i is the fault phase load current of the branch where the suspected fault point is located, D i1 is the distance between the busbar at the substation end and the node of the branch where the suspected fault point is located, D i2 is the distance between the suspected fault point and the node, i=(1, 2, ..., n), n is the total number of suspected fault points, Z is the line unit impedance, R f is the fault resistance; calculate each fault phase voltage V Si Compared with the measured fault phase voltage V of the substation terminal busbar S The proximity between F i , all proximity F i The suspected fault point corresponding to the maximum value in is the actual fault point.
Owner:SICHUAN UNIV
A method for measuring the efficiency of an independent condensing steam-driven feed pump
ActiveCN112302964BGet a complete look at performanceFew measurement parametersEnergy industryPump controlSteam pressureProcess engineering
A method for measuring the efficiency of an independent condensing steam-driven feed pump includes a steam-driven feed pump, a small steam turbine, a condenser, a temperature measurement point, a pressure measurement point, a flow measurement point, and the like. The invention studies the steam-driven feed water pump, the small steam turbine and the condenser as a whole, calculates the shaft power of the steam-driven feed water pump based on the thermodynamic method, and then obtains the efficiency of the steam-driven feed water pump. There are few parameters to be measured, the measurement cost is low, and the measurement error has little impact on the results. Only need to measure: the inlet flow, pressure, and temperature of the steam-powered feed pump, the outlet pressure and temperature of the steam-powered feed pump, and the inlet steam pressure of the small steam turbine. , temperature, condenser circulating water inlet pressure, temperature, flow, condenser circulating water outlet pressure, temperature, hot well condensate temperature, pressure, flow. In order to fully understand the performance of the independent condensing steam-driven feed pump, provide a reliable basis for guiding the economical and safe operation of the steam-driven feed pump, and put forward reasonable suggestions and improvement directions for future economic operation.
Owner:XIAN XIRE ENERGY SAVING TECH +1
Hydraulic performance measuring method and apparatus for heat distribution pipe network
InactiveCN100437062CEliminate hot and cold uniform phenomenonFree from destructionCalorimeterData processing systemEngineering
A heating distribution network hydraulic work condition measuring method and equipment belong to heat supply network move bugging field. Set temperature sensor and hot water runoff sensor on the entrance of each heating spur track to heating distribution network to test the water supply temperature tg and actual testing runoff Lt of the hot water to the heating spur track. Set temperature sensor on the export to heating spur track, inside and outside room of the consumer to test the backwater th to heating spur track, indoor temperature tn and outdoor temperature tw of the consumer. The said sensor send testing value to the data disposal system and the said system deals with the data to get water power maladjustment x of each heating spur track and fact demand flux Ls to each heating user. It ensures the fact demand flux of heating distribution network based on the locale fact load of heating user without destroy the existing pipe system. Its operation is easy with few test parameters for using at locale.
Owner:CEE TECH & MANAGEMENT
Indoor phase change energy storage device and paving method thereof
ActiveCN113008063AConstant phase transition temperatureImprove heating performanceHeating fuelCentral heating componentsElectric heatingProcess engineering
Owner:BEIJING FORESTRY UNIVERSITY
Automatic adjusting device and method of the variable capacitor of the RF board bar CO2 laser matching system
InactiveCN100483870CRealize automatic impedance matchingFew measurement parametersExcitation process/apparatusAuto regulationMicrowave
This invention relates to radio board bar CO2 laser matching system changeable capacitor automatic adjusting device and method, wherein, the device comprises variable capacitor C1 and C2, sensor L, co-axis cable, radio board bar CO2 laser, radio source, microwave tester, small signal amplifying circuit, PLC and step in motor. The invention method comprises the following steps: a, radio source inputs radio impulse with space occupancy less than 20 percent and laser starts and the step motor adjusts capacitor in front and back by speed of 50 to 70; radio source inputs power radio impulse for 40 to 60 percent.
Owner:江苏新潮创新投资集团有限公司
A rv reducer rotary transmission precision error measurement test bench and measurement method
ActiveCN105865782BSimple calculationFew measurement parametersMachine gearing/transmission testingEngineeringReducer
The invention discloses a test bed and method for measuring the rotation transmission precision error of an RV reducer. The method includes the steps of a, measuring the slope k0 of the connecting line between two selected detecting points on a measuring block fixed on the output shaft of the RV reducer; b, allowing the input shaft of the RV reducer to rotate a certain angle phiin, n, and measuring the slope kn of the connecting line between the two detecting points on the measuring block again, wherein the plane changing times of the measuring block during the rotation is m; c, calculating the rotation transmission error epsilon according to the kn, k0, m and phiin, n. The method has the advantages that the measuring of existing methods is simplified, the problems that many parameters exist in the measuring process and calculation is complicated are solved, the method is simple in calculation and few in measuring parameters, and the rotation transmission precision error can be obtained simply.
Owner:YINCHUAN WEILI REDUCER MACHINERY
Measurement device for tangent circle diameter of fuel nozzle of power station boiler and measurement method thereof
The invention discloses a measurement device for the tangent circle diameter of the fuel nozzle of a power station boiler and a measurement method thereof. The measuring device mainly comprises a rectangular steel plate, an infrared generator and a level gauge, wherein clamping grooves are processed on the longitudinal center line and bottom left position of the rectangular steel plate and used for the fixed installation of the infrared generator and the level gauge. According to the invention, a target distance can be accurately measured by utilizing the characteristics of infrared visibility and good positioning, and the theoretical tangent circle diameter can be obtained through simpler geometric calculation. The measurement method disclosed by the invention has the advantages of simple device, few measurement parameter and high accuracy. At present, the device and the calculation method are already successfully applied to the measurement of the theoretical tangent circle in the boilers of generator sets of multiple thermal power companies, and the accuracy and the reliability of measurement data are proved through an operating data result.
Owner:ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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