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32results about How to "Applicable to online monitoring" patented technology
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Enriching and detecting equipment for particles
InactiveCN103323319AAchieve enrichmentEasy to detectPreparing sample for investigationParticle suspension analysisParticulatesEngineering
The invention discloses enriching and detecting equipment for particles. The equipment comprises a sampling chamber body; the sampling chamber body comprises a sampling chamber; a sampling filter membrane is arranged in the sampling chamber, and is used for dividing the sampling chamber into an air inlet chamber and an air outlet chamber; the air inlet chamber is provided with an air inlet, and the air outlet chamber is provided with an air outlet; a detecting device is also arranged in the sampling chamber; a detecting window of the detecting device is communicated with the are inlet chamber and / or the air outlet chamber, so that the particles enriched on the sampling filter membrane are detected and analyzed. According to the enriching and detecting equipment for particles of the invention embodiment, by arranging the sampling filter membrane and the detecting device in the sampling chamber, the enrichment and detection of the particles can be realized simultaneously; problems that particle sampling and enriching are separated, and real-time detection is impossible are solved; errors caused by the movement of the sampling filter membrane are eliminated; and the equipment can be applied in on-line monitoring of particles in gas.
Owner:JIANGSU SKYRAY INSTR
Transformer winding state recognition method based on fuzzy adaptive resonance neural network
InactiveCN106468751AAccurate automatic identificationApplicable to online monitoringElectric winding testingNeural architecturesFeature vectorResonance
The invention discloses a transformer winding state recognition method based on a fuzzy adaptive resonance neural network. The transformer winding state recognition method comprises the steps of (1) arranging monitoring points of a vibration sensor, setting the sampling frequency and the sampling time of a data acquisition instrument, and acquiring transformer vibration signals; (2) performing wavelet packet decomposition and reconstruction on the transformer vibration signals; (3) extracting vibration signal sub-band energy values; (4) analyzing the vibration signal sub-band energy values of each vibration monitoring point, and selecting feature band energy of valid monitoring points to construct a feature vector so as to act as input of the fuzzy adaptive resonance neural network; (5) building the fuzzy adaptive resonance neural network, adjusting network parameters until set precision is reached; and (6) performing recognition on transformer winding state through the fuzzy adaptive resonance neural network. The transformer winding state recognition method can judge a transformer winding pressing state accurately and quickly, and can be applied to online monitoring and recognition for the transformer winding pressing state.
Owner:HOHAI UNIV
Fluid motion vector estimation method based on space-time image
ActiveCN103996171AAvoid uncertaintyImprove robustnessImage enhancementImage analysisImage sequenceTime average
The invention discloses a fluid motion vector estimation method based on a space-time image and belongs to the technical field of flow field measurement. The method firstly adopts a single camera to acquire a fluid image sequence at fixed time intervals; then an aberration correction linear conversion method is adopted to carry out optical distortion correction on images and a group of speed measurement lines are arranged in a flow measurement direction, wherein each speed measurement line uses a pixel as an x-coordinate and a time as a y-coordinate to synthesize a time-space image; then frequency-spectrum analysis is carried out on the time-space images which undergo edge detection and a discrete approximation method is adopted to solve a frequency-spectrum main direction and obtain a texture main direction vertical to the frequency-spectrum main direction; and according to a mapping relation of an object-space coordinate and an image-space coordinate, physical sizes of the speed measurement lines are solved and the value of a one-dimension flow speed vector is calculated through combination of the texture main direction and the time intervals so as to realize time-averaged flow field calibrating. The fluid motion vector estimation method based on the space-time image can be used for time-averaged flow field measurement of natural tracing water flows such as river surfaces and the like and is especially suitable for online monitoring of flow rates of rivers in a flood period.
Owner:HOHAI UNIV
Overvoltage measuring sensor for overhead transmission line based on coupling electric field
ActiveCN102721856AAvoid safety hazardsAccurate monitoringCurrent/voltage measurementVoltage dividersCapacitanceOvervoltage
The invention provides an overvoltage measuring sensor for an overhead transmission line based on a coupling electric field, and relates to an overvoltage online monitoring sensor of the overhead transmission line. The overvoltage measuring sensor provided by the invention mainly comprises a sensor shell, an insulating pad, a fixing board, a partial voltage capacitor group, a matching resistor, a coaxial cable, an inner screening shell, a data collecting unit and the like. The overvoltage measuring sensor provided by the invention has the advantages of simple structure, convenience in mounting and dismounting, low cost, high accuracy of overvoltage measurement, good linearity, high accuracy, strong generality, wide application range, safe and reliable use and the like. With the adoption of the overvoltage measuring sensor provided by the invention, overvoltage online monitoring can be conveniently carried out on the overhead transmission line. The overvoltage measuring sensor provided by the invention can be widely applied to the overvoltage online monitoring of the overhead transmission line, and is particularly suitable for monitoring overvoltage of 110-1000 kV high-voltage overhead transmission lines on line.
Owner:CHONGQING UNIV
Method for monitoring resistance of valve discs of arresters based on resistance-capacitance network
ActiveCN104360197AClear and accurate physical meaningError controllableElectrical testingSpecial data processing applicationsPhase angle differenceMeasurement device
The invention discloses a method for monitoring resistance of valve discs of arresters based on a resistance-capacitance network. The method includes the first step of building an arrestor three-dimensional resistance-capacitance network model based on a three-dimensional finite element static electric field, the second step of solving partition capacitance between the arrestors and capacitance of the valve discs of the arresters, the third step of installing leaked current measurement devices on flanges at the lowest ends of the arresters operating on site, and obtaining actual leaked current measurement values and actual phase angle difference measurement values of the arresters, and the fourth step of solving resistance of the valve discs of the arresters in an iteration mode. The resistance valve of the valve discs of the arresters in operating states can be accurately obtained in the method, errors are controllable, requirements of a project can be met, operation conditions of the arresters are directly and effectively monitored, and meanwhile accurate data references an be provided for power grid operation and maintenance staff; the method is suitable for being used for monitoring a high-voltage zinc oxide arrestor on line.
Owner:WUHAN UNIV
Inverter online open circuit fault detection method
ActiveCN110007183AReduce fault detection timeImprove fault detection speedCurrent/voltage measurementElectrical testingPhase currentsThree-phase
The invention discloses an inverter online open circuit fault detection method. Firstly, the two-phase current of an inverter is collected; calculating is performed to obtain the amplitude and the phase of the three-phase current at the sampling moment; calculating is performed to obtain a per-unit value of the sum of absolute values of the three-phase current at the sampling moment; the per-unitvalue is compared with a preset threshold value; whether an open circuit fault occurs is judged, if yes, fault positioning is performed according to the three-phase current. The method comprises the following specific steps: carrying out per unit processing on the three-phase current, carrying out zero-crossing one-resetting processing on the per unit current, calculating a fault positioning identifier at the sampling moment, and comparing the fault positioning identifier with a preset threshold value to realize the positioning detection of the open-circuit fault phase and the fault tube. According to the method, the detected load current is subjected to online processing for open-circuit fault detection, so that the fault detection time is shortened, and online fault detection is realized.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
Method and device for online detection of state of leakage conductor with series gap
ActiveCN103901302AReduce operation and maintenance costsAchieving state-of-the-art maintenanceElectrical testingElectric power systemEngineering
The invention relates to a method and device for online detection of the state of a leakage conductor with a series gap. The method and device are applied to an electric transmission line of an electric system. A conductor action power frequency current collector is connected with a data processor. A counting indicator is respectively connected with the conductor action power frequency current collector and the data processor. The data processor is connected with a failure alarm indicator. The detected action current and continuous actuation time of the leakage conductor with the series gap are adopted to serve as criteria, alarm threshold values are set for the action current and the voltage value of the continuous actuation time, and when the alarm threshold values are reached or exceeded, an alarm is given for state abnormality of the leakage conductor with the series gap, so that the state of the leakage conductor with the series gap is monitored. A passive monitoring method is adopted in the device, the device is simple in structure, state information of the leakage conductor is provided for operation and maintenance personnel in time, and the operation reliability of the leakage conductor with the series gap is improved.
Owner:JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD +3
Wind turbine generator gearbox bearing temperature state monitoring method based on self-organizing kernel regression model
PendingCN111581597AApplicable to online monitoringShort training timeGeometric CADComplex mathematical operationsAlgorithmTemperature monitoring
The invention discloses a wind turbine generator gearbox bearing temperature state monitoring method based on a self-organizing kernel regression model. A self-organizing kernel regression modeling method and a sequential probability ratio residual error analysis method are introduced into wind turbine generator state monitoring. A partial least squares method is adopted to select variables, a self-organizing kernel regression method is adopted to establish a relation model between the bearing temperature of the gearbox and influence variables of the bearing temperature, and the model is usedfor predicting the bearing temperature of the gearbox in the monitoring stage. In order to reduce the false alarm rate and the missing alarm rate of gearbox bearing temperature early warning, a sequential probability ratio method is adopted to analyze a residual error between a gearbox bearing temperature prediction value calculated by the model and an actual value, and when the sequential probability ratio is larger than a set threshold value, a gearbox bearing temperature abnormity alarm is given out. The method is used for analyzing the temperature data of the gearbox bearing, the purposesof temperature monitoring and fault early warning of the gearbox bearing of the wind turbine generator are accurately achieved, and the practicability and universality of the method are verified.
Owner:HUADIAN ELECTRIC POWER SCI INST CO LTD
Device for online monitoring of grounding loop current of urban cable line
PendingCN106814243AImprove monitoring efficiencyEasy to installMeasurement using digital techniquesSoftware engineeringA d converter
The invention belongs to the technical field of cable online monitoring, and especially relates to a device for the online monitoring of a grounding loop current of an urban cable line. The device is high in efficiency, is convenient for power supply and is stable in operation. The device comprises a current collection module, a signal analysis and processing module, a wireless communication module, and a power module. The structural main points of the device are that a cable grounding current signal is connected with a current collection module; the current collection module is connected with the signal analysis and processing module; the signal analysis and processing module is connected with the wireless communication module; the power module supplies power to the current collection module, the signal analysis and processing module and the wireless communication module; the current collection module comprises an A-phase current collection circuit, a B-phase current collection circuit, a C-phase current collection circuit, an N-phase current collection circuit, and an analog-digital converter.
Owner:STATE GRID LIAONING ELECTRIC POWER CO LTD SHENYANG POWER +2
Visual intelligent monitoring system and method for ash deposition corrosion wear state of medium-low temperature smoke heat exchange equipment
ActiveCN111855547AReduce experimental errorMonitor heat transfer performanceWeather/light/corrosion resistanceMaterial heat developmentData setNeural network nn
The invention relates to a visual intelligent monitoring system and method for the ash deposition corrosion wear state of medium-low temperature smoke heat exchange equipment, which are characterizedin that actual smoke is adopted, the actual operation working condition is fitted, the smoke inlet temperature and air speed can be adjusted, the working conditions of different smoke temperatures andflow speeds of the whole smoke system are simulated, and online monitoring data are provided; a resistance probe and an eddy current sensor are used for monitoring the conditions of heat exchange, corrosion resistance, wear resistance, ash deposition, coking and the like of the heat exchange tube; based on the convolutional neural network and an intelligent identification and analysis model of amonitoring probe state image, an image data set is made by using a large number of on-site pictures of the monitoring probe and the calculated heat transfer coefficient, ash deposition thermal resistance, corrosion rate and wear rate, and accurate matching of the image and the heat exchange tube state is realized; the intelligent identification and analysis model adopts a convolutional neural network algorithm model to carry out pixel-level processing on the image, state image features are accurately identified, and the accuracy of an analysis result is high; and the heat transfer coefficient,the ash deposition thermal resistance, the corrosion rate and the wear rate of the heat exchange tube are analyzed by images.
Owner:NORTHEAST DIANLI UNIVERSITY
Online rotary ferrograph and equipment oil online monitoring method
PendingCN110595963AReduce gravitational effectsEasy to cleanParticle size analysisIndividual particle analysisImaging qualityBarrel Shaped
The invention discloses an online rotary ferrograph and an equipment oil online monitoring method. The online rotary ferrograph comprises an abrasive particle deposition spectrum forming module and amagnetic head module, wherein the magnetic head module comprises a rotatable magnetic head; the magnetic head comprises a barrel-shaped magnetic conductive bottom block, a pole shoe connected to an opening in the upper end of the magnetic conductive bottom block in a covering mode, and an electromagnet column located at the axis of the magnetic conductive bottom block; one end of the electromagnetcolumn is connected with the bottom surface of the magnetic bottom block and the other end is connected with the pole shoe to form a closed magnetic loop; the magnetic head module further comprises aconductive slip ring used for supplying power to the rotating electromagnet column; the abrasive particle deposition spectrum forming module is positioned above the pole shoe; and a to-be-detected liquid is placed in the abrasive particle deposition spectrum forming module for deposition and spectrum forming. Residual oil and pollutants in a deposition region can be cleaned and thrown away by means of the online rotary ferrograph, thus the online monitoring image quality is improved; two annular deposition surfaces with different diameters can be formed, and due to the fact that the magneticinduction intensities of the two annular deposition surfaces are different, the size ranges of abrasive particles deposited on the two annular deposition surfaces are different, and the spectrum forming monitoring efficiency is improved.
Owner:CHINA UNIV OF MINING & TECH
Device and method for rapidly measuring moisture content of slurry
InactiveCN111238998AAccurate measurementSimple structureSpecific gravity measurementProcess engineeringSlurry
The invention provides a device and a method for rapidly measuring the moisture content of a slurry. The device for rapidly measuring the moisture content of the slurry comprises a slurry container body, a weight sensor is arranged in the center of the bottom of the slurry container body, a slurry height measuring meter is arranged on the outer side of the slurry container body, and the slurry height measuring meter is communicated with the slurry container body. The invention further provides a method for rapidly detecting the moisture content of the slurry by utilizing the device. The deviceis simple in structure and low in manufacturing cost. The method can rapidly and accurately measure the moisture content of the slurry, and is especially suitable for online monitoring of the moisture content of a large batch of slurry in industrial production.
Owner:HUNAN AEROSPACE MAGNET & MAGNETO
Automatic on-line monitor for measuring water body COD (chemical oxygen demand)
ActiveCN105510423AReduce volumeMiniaturizationMaterial analysis by electric/magnetic meansPeristaltic pumpChemical oxygen demand
The invention discloses an automatic on-line monitor for measuring the water body COD. The monitor comprises an ultraviolet transparent electrolytic cell, wherein a reference electrode, a counter electrode and a working electrode made from a TiO2 nanometer material are arranged in the electrolytic cell, the reference electrode and the counter electrode are arranged on the same side of the working electrode in parallel, the reference electrode, the counter electrode and the working electrode are connected to a constant potential rectifier, a liquid inlet is formed in the upper end, located on one side of the working electrode, of the electrolytic cell, a high-power LED ultraviolet lamp is arranged on the outside of the electrolytic cell, and a liquid outlet is formed in the lower end, located on the other side of the working electrode, of the electrolytic cell. According to the automatic on-line monitor for measuring the water body COD, a high-power ultraviolet LED light source and an efficient heat dissipation structure, the nanometer TiO2 working electrode, a peristaltic pump and a miniature electromagnetic valve are adopted, so that light, rapid and automatic on-line monitoring is realized, the volume of test solution required for analysis each time is small, secondary pollution is not caused, and the monitor is suitable for site and on-line monitoring and can be used for laboratory analysis.
Owner:江苏国技聚能环境科技有限公司
Biosensor for monitoring ammonia concentration in water on line
PendingCN107345930ANo secondary pollutionHigh measurement accuracyMaterial electrochemical variablesData treatmentLight-emitting diode
The invention relates to the technical field of environment monitoring, and in particular discloses a biosensor for monitoring ammonia concentration in water on line. The biosensor comprises a probe module and a data processing display module, wherein the probe module is connected with the data processing display module through a connecting module. The biosensor is characterized in that the probe module is of a multi-layer tubular structure and is composed of a porous cathode rod, a Nafion coating, a carbon-based anode, an electric active biological membrane, an ion screening membrane and a protection filtering net in sequence from inside to outside; the connecting module is an adjustable telescopic rod in which a lead is wrapped; the upper end and the lower end of the adjustable telescopic rod are respectively connected with the carbon-based anode and the porous cathode rod; the data processing display module comprises a sealing waterproof shell in which a signal conversion memory is mounted; an LED (Light Emitting Diode) display screen is arranged on the sealing waterproof shell; and two ends of the signal conversion memory are connected with the lead. The biosensor is simple in structure, low in manufacturing cost, simple to maintain and long in service life.
Owner:BINZHOU UNIV
Fault diagnosis method for ANPC three-level inverter
ActiveCN112731019APreserve integrityImprove reliabilityElectrical testingEcho state networkThree level inverter
The invention relates to a fault diagnosis method for an ANPC three-level inverter. The fault diagnosis method comprises the following steps: constructing an ANPC three-level inverter circuit simulation model, and acquiring upper, middle and lower bridge arm voltage signals of each phase through a voltage sensor; extracting a wavelet packet energy spectrum as a signal feature, performing dimension reduction on the extracted data to obtain a final signal feature vector, and dividing the final signal feature vector into training data and test data; establishing a joint optimization echo state network JO-ESN, optimizing parameters of an echo state network ESN reserve pool, and training the joint optimization echo state network JO-ESN by using the training data to obtain a trained JO-ESN model; and testing the JO-ESN model by using the test data, and analyzing a diagnosis result. According to the invention, the wavelet packet is used to replace the traditional wavelet and Fourier transform to extract the fault signal, the integrity of the signal is effectively retained, and the LDA is used to reduce the dimension after the fault signal is extracted, so that the fault diagnosis time can be effectively reduced.
Owner:HEFEI UNIV OF TECH
Online monitoring system for closed bearing lubricating oil condition and bearing fault
ActiveCN109798303AApplicable to online monitoringBearing assemblyLubrication elementsControl signalMonitoring system
The invention discloses an online monitoring system for a closed bearing lubricating oil condition and a bearing fault. The online monitoring system comprises two sealing rings which can be used as polar plates and arranged at two ends of a bearing, guiding lines are connected to and led out from the sealing rings, two simulation switches are connected to the two sealing rings through the guidinglines correspondingly, the two simulation switches are connected with one common capacitance measuring circuit and two individual charge measuring circuits, and the polar plates are controlled to be connected with a chosen circuit through the simulation switches; the simulation switches are connected with a digital port of an embedded system, the embedded system controls and generates control signals to switch the simulation switches, and the embedded system is electrically connected with an upper computer for analyzing signals; the sealing rings on the two sides of the bearing are used as capacitance measuring electrodes and sensing electrodes of the two charge measuring circuits, so that the system can collect the lubricating oil condition of the bearing and charge information, online comprehensive monitoring of the lubricating oil condition can be carried out, the partial fault of the bearing can be monitored synchronously, and the online monitoring system has the characteristics that the precision is high, the use is convenient and the operation is flexible.
Owner:XI AN JIAOTONG UNIV
Online monitoring method for exhaust steam dryness of low-pressure cylinder of steam turbine
ActiveCN110333081ASimple calculationApplicable to online monitoringGas-turbine engine testingAnalysing gaseous mixturesThroatAtmospheric air
The invention discloses an online monitoring method for the exhaust steam dryness of a low-pressure cylinder of a steam turbine. According to the method, an online monitoring system for the exhaust steam dryness of the low-pressure cylinder of the steam turbine is adopted for carrying out monitoring; in the system, exhaust steam of the low-pressure cylinder of the steam turbine is extracted by a throat of a condenser, enters the condenser through a gas-side inlet of the condenser, and then is discharged to the atmosphere by a gas-side outlet of the condenser and a vacuum pump; a refrigerant inlet and a refrigerant outlet of the condenser are connected with an outlet and an inlet of a refrigerating machine respectively; a drain opening of the condenser is connected with a hot well of the condenser through a drain pipeline; and sensors are correspondingly arranged at the gas-side inlet, the gas-side outlet and the drain opening of the condenser. According to the online monitoring methodfor the exhaust steam dryness of the low-pressure cylinder of the steam turbine, the calculation process is simple, and complex iterative calculation is not needed, so that the online monitoring method is more suitable for online monitoring; and the pressure, the temperature, the flow rate and the humidity of a medium are only required to be measured in the monitoring process, and the obtaining method of the parameters is mature and reliable, so that the relatively accurate parameters can be obtained, and the obtaining cost is relatively low.
Owner:GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
A method and device for online detection of the state of a line arrester with a series gap
ActiveCN103901302BReduce operation and maintenance costsAchieving state-of-the-art maintenanceElectrical testingElectric power systemElectrical current
Owner:JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD +3
Inverter Online Open Circuit Fault Detection Method
ActiveCN110007183BReduce fault detection timeImprove fault detection speedCurrent/voltage measurementContinuity testingPhase currentsInverter
The invention discloses an inverter online open-circuit fault detection method. Firstly, the two-phase current of the inverter is collected, and then the amplitude and phase of the three-phase current at the sampling time are calculated, and then the three-phase current at the sampling time is calculated based on the method. The per-unit value of the sum of the absolute values of the current, compare this per-unit value with the preset threshold to determine whether an open-circuit fault occurs, and if it occurs, perform fault location based on the three-phase current. The specific method is to perform a per-unit Then perform zero-crossing and “one” processing on the unitized current, calculate the fault location identification at the sampling time, compare the fault location identification with the preset threshold, and realize the location detection of the open circuit fault phase and the fault tube. The invention performs on-line processing on the detected load current to perform open-circuit fault detection, reduces fault detection time, and realizes on-line fault detection.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
Monitoring Method of Surge Arrester Valve Plate Resistance Based on Resistance-Capacitance Network
ActiveCN104360197BAccurately obtain the resistance valueAccurate Data ReferenceElectrical testingSpecial data processing applicationsCapacitanceMeasurement device
Owner:WUHAN UNIV
Nondestructive online monitoring method and device based on spectrum method
PendingCN114858770ANo pollution in the processNo lossPerfluorocarbons/hydrofluorocarbons captureFluorescence/phosphorescenceTemperature controlFluorescence
The invention belongs to the technical field of high-voltage electrical equipment, and particularly relates to a nondestructive online monitoring method and device based on a spectrum method. The device comprises a gas inlet, a first electromagnetic valve, a pressure reducing valve, an SO2 fluorescence detection unit, a CO infrared absorption detection unit, a CF4 infrared absorption detection unit, a first pressure sensor, a flow meter, a regulating valve, a second electromagnetic valve and a collecting tank which are sequentially connected in series through a pipeline, one end of the third electromagnetic valve is communicated with the first electromagnetic valve through a pipeline, and the other end of the third electromagnetic valve is communicated with the rear end of the second electromagnetic valve through a pipeline; the first pressure sensor and the temperature sensor are connected to the upper portion of the collecting tank, and the temperature control unit is connected to the outer wall of the collecting tank. The gas chamber monitoring device has the characteristics of simple structure and capability of flexibly monitoring different gas chambers on line. The concentration of the SF6 decomposition product is detected in a stable normal-pressure environment by adopting a spectrum method, the insulating property of the insulating gas in the gas chamber is ensured not to be reduced, the gas to be detected is free of pollution and loss, and the sensitivity is relatively high.
Owner:STATE GRID LIAONING ELECTRIC POWER RES INST +2
Quantitative detection method of moisture distribution uniformity in solid-state fermentation by hyperspectral image technology
ActiveCN105158177BReduce testing costsDetection speedColor/spectral properties measurementsMoisture distributionImaging technique
Owner:JIANGSU UNIV
Multi-region detection system for partial discharge decomposition components of insulating gas and method thereof
ActiveCN102608505BImprove sealingImprove applicabilityTesting dielectric strengthElectrical measurement instrument detailsCapacitanceGas cylinder
Owner:CHONGQING UNIV +2
Detection device and water quality online detection system with the detection device
ActiveCN104297178BAchieve heating controlSmall footprintColor/spectral properties measurementsTemperature controlWater quality
The invention discloses a detection device and an online water quality detection system provided with the detection device. The detection device comprises a detection tank which is provided with a reagent inlet, a water sample inlet, an air inlet, an overflow hole and a liquid discharge hole, wherein the detection tank is also provided with a mixing hole; the mixing hole is connected with a mixing pump used for mixing the mixed liquid in the detection tank; the mixing pump is connected with a controller used for controlling the work of the mixing pump; the detection tank is also provided with a heating device and a temperature sensor used for detecting the temperature of the wall body of the detection tank; the controller is used for receiving signals of the temperature sensor and controlling the work of the heating device. According to the detection device, the design with multiple functions of reaction, heating, temperature control, mixing, detection, overflowing and the like can be realized, the space occupation area is reduced, installation parts are saved, and the consumption of a water sample and a reagent can be greatly reduced; furthermore, long optical path design is adopted, so that the detection sensitivity is high.
Owner:LIHE TECH (HUNAN) CO LTD
On-line Monitoring Method of Exhaust Steam Dryness of Low Pressure Cylinder of Steam Turbine
ActiveCN110333081BSimple calculationApplicable to online monitoringGas-turbine engine testingAnalysing gaseous mixturesMonitoring systemVacuum pump
The invention discloses an online monitoring method for the exhaust steam dryness of a low-pressure cylinder of a steam turbine. According to the method, an online monitoring system for the exhaust steam dryness of the low-pressure cylinder of the steam turbine is adopted for carrying out monitoring; in the system, exhaust steam of the low-pressure cylinder of the steam turbine is extracted by a throat of a condenser, enters the condenser through a gas-side inlet of the condenser, and then is discharged to the atmosphere by a gas-side outlet of the condenser and a vacuum pump; a refrigerant inlet and a refrigerant outlet of the condenser are connected with an outlet and an inlet of a refrigerating machine respectively; a drain opening of the condenser is connected with a hot well of the condenser through a drain pipeline; and sensors are correspondingly arranged at the gas-side inlet, the gas-side outlet and the drain opening of the condenser. According to the online monitoring methodfor the exhaust steam dryness of the low-pressure cylinder of the steam turbine, the calculation process is simple, and complex iterative calculation is not needed, so that the online monitoring method is more suitable for online monitoring; and the pressure, the temperature, the flow rate and the humidity of a medium are only required to be measured in the monitoring process, and the obtaining method of the parameters is mature and reliable, so that the relatively accurate parameters can be obtained, and the obtaining cost is relatively low.
Owner:GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
Ion meter based determination method for determining cyanide content of wastewater
PendingCN113390933AThe detection data is accurateDetection data is fastMaterial electrochemical variablesWastewaterMagnetic stirrer
The invention discloses an ion meter based determination method for determining the cyanide content of wastewater. Equipment used in the method includes an ion meter, a cyanide ion electrode, a temperature compensation electrode, a magnetic stirrer, a 100ml beaker, a 1000ml volumetric flask, a 100ml volumetric flask, a 50ml volumetric flask, an ion enhancer made of a sodium hydroxide saturated solution, and sodium cyanide standard calibration solutions with calibration degrees of 0.1 ppm, 1ppm and 10ppm. Compared with a silver nitrate titration method, the method disclosed by the invention has the beneficial effects of accurate detection method, rapidness, suitability for online monitoring, capability of providing effective data for production control in time and capability of greatly improving the production efficiency.
Owner:宁夏坤正生物科技有限公司
A Closed Bearing Lubricating Oil Status and Bearing Fault Online Monitoring System
ActiveCN109798303BApplicable to online monitoringBearing assemblyLubrication elementsThermodynamicsControl signal
The invention discloses an online monitoring system for a closed bearing lubricating oil condition and a bearing fault. The online monitoring system comprises two sealing rings which can be used as polar plates and arranged at two ends of a bearing, guiding lines are connected to and led out from the sealing rings, two simulation switches are connected to the two sealing rings through the guidinglines correspondingly, the two simulation switches are connected with one common capacitance measuring circuit and two individual charge measuring circuits, and the polar plates are controlled to be connected with a chosen circuit through the simulation switches; the simulation switches are connected with a digital port of an embedded system, the embedded system controls and generates control signals to switch the simulation switches, and the embedded system is electrically connected with an upper computer for analyzing signals; the sealing rings on the two sides of the bearing are used as capacitance measuring electrodes and sensing electrodes of the two charge measuring circuits, so that the system can collect the lubricating oil condition of the bearing and charge information, online comprehensive monitoring of the lubricating oil condition can be carried out, the partial fault of the bearing can be monitored synchronously, and the online monitoring system has the characteristics that the precision is high, the use is convenient and the operation is flexible.
Owner:XI AN JIAOTONG UNIV
Power grid fault impact strength quantitative index analysis method based on EWM
PendingCN113484678AReflect voltage stabilityApplicable to online monitoringFault locationAlgorithmElectric power system
The invention discloses a power grid fault impact strength quantitative index analysis method based on EWM. The method comprises the following steps: establishing a sub-index model according to power grid fault transient data, solving a voltage drop area, a voltage drop amplitude and a voltage change rate of a target node, establishing a decision matrix and performing utility type normalization processing on matrix data, and then according to EWM, calculating characteristic proportions of evaluation objects, calculating entropy values of indexes, calculating information redundancy, calculating weights of all the indexes, and finally calculating a comprehensive score of each evaluation object, namely a value of a quantitative index. The method is simple in principle, rapid in calculation, good in performance, capable of achieving quantitative expression of the system node voltage stability after the power system is subjected to fault impact in a short time, good in use value, and capable of enhancing manual judgment of the severity of the system fault to a certain extent through data visualization, and a control strategy is adopted to prevent further expansion of the fault.
Owner:HANGZHOU DIANZI UNIV +2
Overvoltage measuring sensor for overhead transmission line based on coupling electric field
ActiveCN102721856BAvoid safety hazardsAccurate monitoringCurrent/voltage measurementVoltage dividersCapacitanceOvervoltage
Owner:CHONGQING UNIV
Automatic analysis device for analyzing gaseous total mercury
PendingCN113884649AImprove accuracySimple and reliable online analysis technologyTesting waterPhysical chemistryElemental mercury
The invention relates to an automatic analysis device for analyzing gaseous total mercury. The device comprises an automatic gas inlet mechanism provided with a first pipeline for conveying a be-detected sample gas; a condensation and cracking mechanism which is used for receiving the to-be-detected sample gas, enriching gaseous total mercury in the to-be-detected sample gas at a low temperature and analyzing all the gaseous total mercury in the to-be-detected sample gas into gaseous elemental mercury at a high temperature; an automatic gas transmission mechanism provided with a second pipeline for conveying gaseous elemental mercury; a detection analysis mechanism used for analyzing the total concentration of the gaseous elemental mercury; and a controller used for controlling the automatic operation of the automatic gas inlet mechanism, the condensation and cracking mechanism and the automatic gas transmission mechanism. According to the automatic analysis device, the gaseous total mercury in the to-be-detected sample gas can be completely collected, and the accuracy of analyzing the total mercury concentration of the to-be-detected sample gas is improved, so that the measurement of the total total mercury content of the gas in the sample is really realized, meanwhile, a simple, convenient and reliable online analysis technology is realized, and the analysis cost is reduced.
Owner:INST OF GEOCHEM CHINESE ACADEMY OF SCI
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