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54 results about "Thermal rating" patented technology
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Definition: Thermal Rating. Thermal Rating. The maximum amount of electrical current that a transmission line or electrical facility can conduct over a specified time period before it sustains permanent damage by overheating or before it sags to the point that it violates public safety requirements. Related Terms.
Thermally protected light emitting diode module
ActiveUS8405947B1Short circuitPoint-like light sourceLighting support devicesCelsius DegreeComputer module
A recessed light fixture includes a thermally protected light emitting diode (“LED”) module. The thermally protected LED module includes a thermal protector positioned in series between a source of electrical power and an LED driver and is configured to open a circuit to prevent power from being supplied by the power source to the LED driver for an LED package when a thermal rating or activation temperature of the thermal protector is exceeded. For example, the maximum operating temperature of the LED driver may be 90 degrees Celsius, and the thermal rating of the thermal protector may be 80 degrees Celsius, and when the temperature of the driver or a mounting bracket upon which the driver is mounted reaches 80 degrees Celsius, the thermal protector opens a circuit and removes current flow from the power source to the driver, thereby removing power to the LED package.
Owner:SIGNIFY HLDG BV
System and Method for Rack management and Capacity Planning
A system and method for monitoring, at a Web browser, electrical components can include the steps of receiving, information related to electrical components, such as servers, disposed in a plurality of cabinets, a portion of the cabinets being located in a first geographic location, and a second portion of the cabinets being located in a second geographic location, remote from the first geographic location, receiving information related to the real-time characteristics of the electrical components and displaying a graphical representation of the cabinets, the components and the information related to the real-time characteristics of the electrical components. The information related to the electrical components can include which cabinet the electrical components are located, the rated current draw of the electrical component, and the rated temperature of the electrical component. The real-time characteristics of the electrical components can include the actual percentage of rated current load, the actual percentage of rated temperature, and the actual percentage power draw. Displayed views can include a cabinet view, a room view, a floor view, a building view, a state view, a country view and a world view.
Owner:FIELDVIEW SOLUTIONS
Power system emergency control optimization method considering power transmission line temperature characteristic
ActiveCN105449669AEmergency Control Time Computational ScienceAccurate calculation of emergency control timeSystems intergating technologiesInformation technology support systemData acquisitionEngineering
The invention discloses a power system emergency control optimization method power transmission line temperature characteristic. The method comprises the steps of obtaining real-time running state information of a power grid and running environment information based on a (supervisory control and data acquisition) SCADA system and a (dynamic thermal rating) DTR system, and performing extended state evaluation considering the line temperature and thermal rating of the power system to obtain the thermal rating of the power transmission line; calculating an allowed emergency control time of the power system by combining a dynamic thermal rating theory; providing a new index for judging the thermal stability of the power system, and providing a safety margin for calculating the thermal stability of the power system; and establishing a system emergency control optimization model considering the power transmission line temperature characteristic, wherein the optimized result of the model is the emergency control policy. On the premise of ensuring that the system can eliminate the line power flow out-of-limit and voltage out-of-limit within the allowed time, the control cost can be the minimum; and namely, the running safety of the system is fully ensured, the operation economy is taken into consideration as well, and the control structure is more scientific and effective.
Owner:ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
Thermal powerline rating and clearance analysis using local thermal sensor
A method for modeling of an overhead electrical conductor, includes: collecting 3-dimensional location data of the conductor; substantially simultaneous with said collecting, acquiring a thermal measurement of the conductor with a local thermal sensor; and generating a CAD model of the conductor using the collected 3-dimensional location data of the conductor and the thermal measurement of the conductor. The CAD model facilitates thermal line analysis of the conductor, thermal rating of a power line that includes the conductor, clearance analysis relative to the conductor, and vegetation management relative to the conductor. Apparatus for determining temperature of the overhead electrical conductor, includes: a local thermal sensor that acquires thermal measurements of the conductor; and a data processor that extracts thermal readings from the thermal measurement, and processes the thermal readings and remotely collected 3-dimensional location data of the conductor to determine the temperature of the conductor.
Owner:HUDSON POWER TECH LLC
Thermal powerline rating and clearance analysis using local thermal sensor
A method for modeling of an overhead electrical conductor, includes: collecting 3-dimensional location data of the conductor; substantially simultaneous with said collecting, acquiring a thermal measurement of the conductor with a local thermal sensor; and generating a CAD model of the conductor using the collected 3-dimensional location data of the conductor and the thermal measurement of the conductor. The CAD model facilitates thermal line analysis of the conductor, thermal rating of a power line that includes the conductor, clearance analysis relative to the conductor, and vegetation management relative to the conductor. Apparatus for determining temperature of the overhead electrical conductor, includes: a local thermal sensor that acquires thermal measurements of the conductor; and a data processor that extracts thermal readings from the thermal measurement, and processes the thermal readings and remotely collected 3-dimensional location data of the conductor to determine the temperature of the conductor.
Owner:HUDSON POWER TECH LLC
Method and System for Determining the Thermal Power Line Rating
ActiveUS20160178681A1Thermometer detailsThermometers using material expansion/contactionEngineeringAmpacity
Method for measuring the power line thermal rating or maximum allowable current rating of an overhead power line with respect to a suspended / anchored cable span (2), comprising at least the following steps of:monitoring a motion of at least one point P of said suspended / anchored cable span (2) over a time interval;monitoring actual line current I, in A, over said time interval;determining an actual sag of said suspended / anchored cable, as a variable of actual line current;measuring or determining the effective wind speed of said suspended / anchored cable span (2) over said time interval;determining a sag reserve DF, in m, for thermal rating, which is the distance between the actual sag and a maximum allowable sag;determining the rate of change, tan(α), in m / A2, of the actual sag versus the square of the line current for the effective wind speed; anddetermining the power line thermal rating of the overhead power line, or ampacity, linked to a corresponding safety clearance, at measured or determined effective wind speed, by adding the square of actual current I to the ratio of the sag reserve DF by the sag rate of change, tan(α), at the effective wind speed, and taking the square root of that addition, i.e.Ampacity=I2+DFtan(α),wherein ampacity is in amperes.
Owner:AMPACIMON
A power control method and device
ActiveCN108268082AStable temperatureAvoid temperature overshootElectric variable regulationControl powerEngineering
The invention provides a power control method and device. The method comprises the steps of: acquiring an actual measurement temperature of a controlled target; comparing the actual measurement temperature and a rated temperature, and, in response to the increase of the actual measurement temperature from a value lower than the rated temperature to a value higher than the rated temperature or thereduction of the actual measurement temperature from a value higher than the rated temperature to a value lower than the rated temperature, resetting an accumulative temperature error value acquired by accumulating temperature error values, wherein the temperature error values are the difference values between the rated temperature and the actual measurement temperature; based on the temperature error values and the accumulative temperature error value at the current moment, determining the input power upper limit value of the controlled target; controlling power provided for the controlled target based on the input power upper limit value. According to the technical solution, the temperature of a controlled target can be stabilized around a rated temperature faster, so that the performance of the controlled target can be maximized while the controlled target is protected.
Owner:SPREADTRUM COMM (SHANGHAI) CO LTD
Early-warning method and system for overheating risk for cable lines of distribution network
PendingCN109324261ARealize real-time monitoringAchieve forecastFault location by conductor typesElectrical resistance and conductanceHigh rate
The invention provides an early-warning method and a system for an overheating risk for cable lines of a distribution network. The method comprises steps of: calculating resistance values of the cablelines in the historical period; determining resistance values of the cable lines in the prediction period according to the resistance values for the cable lines in the historical period; implementingthe early-warning of the overheating risk for the cable lines, according to a preset early-warning rule for overheating risk for cable lines and the resistance values of the cable lines in the historical period and the prediction period, wherein the early-warning rule for overheating risk for cable lines comprises a resistance threshold value, which is determined from the highest rated temperature and the linear relationship between the body temperature and the resistance. According to the early-warning method and the system for the overheating risk for cable lines of the distribution network, the method and the system can effectively realize the real-time monitoring and the prediction for the impedance parameters of cable lines of the distribution network; can accurately predict the overheating risk of the cable lines of the distribution network; has the advantages of being good in practicability, small in cost, simple in calculation, and easy to operate; and can provide a decision basis for the grid operator to operate and to maintain the cable lines.
Owner:CHINA ELECTRIC POWER RES INST +2
Incorporated device and method for controlling incorporated device
InactiveCN107074592AIncrease temperatureInhibition of shortened lifespanCellsWater/sewage treatment by electrochemical methodsReference currentEngineering
Owner:MORINAGA MILK IND CO LTD
Regional power grid overhead line thermal rating probability prediction method based on regional weather forecasting
ActiveCN108734342AImprove the level of safe and economical operationForecastingOverhead lineElectric power
The invention discloses a regional power grid overhead line thermal rating probability prediction method based on regional weather forecasting. The method comprises the steps that regional weather forecasting historical data is preprocessed as a training set; regional weather forecasting values of meteorological factors in the same season and micro-meteorological data of overhead lines in corresponding hours are extracted from the training set; the deviation between each meteorological factor forecasting value and micro-meteorology in each meteorological interval is calculated, and a sample set of the meteorological deviations is established; based on the sample set of the meteorological deviations, probability density distribution of the meteorological deviations of all the meteorologicalfactors in each forecasting interval in each season is estimated; and probability density distribution of thermal ratings of the overhead lines in a prediction time period is estimated. Through the method, a possible fluctuation range and probability distribution of the thermal ratings in the prediction time period can be given according to regional forecasting information, and the prediction result has practical significance in helping scheduling and efficient utilization of transmission line loading capability and raising the safe and economical operation level of a power system.
Owner:SHANDONG UNIV
Overload prevention system to improve intermittent load capacity of electric drive applications
InactiveUS20140226240A1Electric motor controlEmergency protective arrangements for automatic disconnectionEngineeringLimit value
An overload prevention system and method for an electric circuit having a plurality of components is disclosed, where each component has a set of pre-computed parameters. For each component, monitored parameters are observed; a limited value is computed using the pre-computed and monitored parameters; and it is determined if the limited value reached a limit. If the limited value reaches the limit; the system limits one of the monitored parameters. Pre-computed parameters can include time constant and rated current; monitored parameters can include current; and limited value can be component temperature. A time constant, rated current and rated temperature can be pre-computed such that the temperature stays at or below the rated temperature when the current is substantially equal to the rated current. Per unit values can also be used such that per unit temperature stays at or below unity when per unit current is substantially equal to unity.
Owner:DEERE & CO
Circulating pump real time quantity regulation and control system
InactiveCN1667535ARealize centralized regulation and control of heating loadSignificant power saving effectLighting and heating apparatusEfficient regulation technologiesEngineeringTiming/quantity
The invention discloses a circulating water pump real-time amount adjustment control system, which comprises a multichannel water distribution apparatus, a boiler control apparatus and a water pump control apparatus.The multichannel water distribution apparatus distributes water according to water temperature and demand, wherein, a boiler control apparatus detects the maximum temperature, when boiler load increases and water temperature rises to set point, a water pump control apparatus will control variable-speed water pump to send out increased load heat, then, temperature drops to set point.Conversely, when a boiler load decreases and water temperature is lower than set point, a water pump control appatarus will control variable-speed water pump to reduce speed and flow, then temperature rises to set point.
Owner:王占斌
Control method for air heater
InactiveCN104807181ASave energyProtection securityDrying gas arrangementsAir heatersVoltage amplitudeFrequency changer
The invention discloses a control method for an air heater and belongs to the technical field of fan equipment. The method adopts an air heater control system and comprises the following steps of pressing down a switch to enable an electric heating tube to heat, delaying a time relay for 15 minutes and then connecting; meanwhile, sensing a real-time temperature signal in a hot air chamber and transmitting the temperature signal to a frequency converter by a temperature sensor; comparing the temperature signal with a preset rated temperature range, controlling the voltage amplitude of the electric heating tube and further enabling the temperature to be positioned within the rated temperature range by the frequency converter; besides, sensing a real-time air quantity signal in the hot air chamber and transmitting the air quantity signal to the frequency converter by an air quantity sensor; comparing the air quantity signal with the preset rated air quantity range, controlling the voltage amplitude of a motor and further enabling the air quantity to be positioned within the rated air quantity range by the frequency converter. According to the control method disclosed by the invention, the problem that as an existing air heater is single in control function, the temperature and the air outlet volume cannot be simultaneously controlled can be solved.
Owner:LIUZHOU KAITONG MACHINERY
Detecting method and device for heating of power transmission line clip, and detecting device
The present application relates to a detecting method and device for heating of a power transmission line clip and a detecting device. The method comprises the following steps: applying a rated current to a power transmission line, wherein the rated current is a current required when the power transmission line is fully loaded; determining a rated temperature that the power transmission line reaches under the condition of inputting the rated current; detecting an actual temperature that the power transmission line reaches under the condition of inputting the rated current; and determining a clip heating point by comparing the rated temperature and the actual temperature. The clip heating point can be found quickly by using the method; the clip in a hidden danger is found; the method in theinvention can also be used as a new method for fastening a new line clip bolt or not.
Owner:GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
Thermally protected light emitting diode module
A recessed light fixture includes a thermally protected light emitting diode (“LED”) module. The thermally protected LED module includes a thermal protector positioned in series between a source of electrical power and an LED driver and is configured to open a circuit to prevent power from being supplied by the power source to the LED driver for an LED package when a thermal rating or activation temperature of the thermal protector is exceeded. For example, the maximum operating temperature of the LED driver may be 90 degrees Celsius, and the thermal rating of the thermal protector may be 80 degrees Celsius, and when the temperature of the driver or a mounting bracket upon which the driver is mounted reaches 80 degrees Celsius, the thermal protector opens a circuit and removes current flow from the power source to the driver, thereby removing power to the LED package.
Owner:SIGNIFY HLDG BV
Performance detecting process of well control product and well head apparatus under low temperature state
ActiveCN101281081ASimulated tightnessSimulate low temperature sealing performanceMeasurement of fluid loss/gain rateStrength propertiesComputer monitoringMetallic materials
The invention discloses a performance detection technology for well control products and wellhead devices in conditions with low surrounding temperature, comprising steps as follows: opening a low environment temperature box, reducing and stabilizing temperature to a rated temperature of subzero 69 DEG to subzero 29 DEG; then opening a pressure device, pressurizing a measured object to a rated working pressure of 1 to 140 MPa; stabilizing the pressure for 0.5 to 2 hours, then reducing the pressure to 0 MPa after a computer monitoring and control system deciding whether the quality and performance of the measured object is qualified according to fluctuations of the temperature and pressure values, increasing temperature to the normal value, then completing the detection. Through pressure testing in low temperature condition, reducing the temperature of the measured object and simulating the practical working condition to decide whether the quality and performance of the measured object meets the requirements of the site use, the invention can detect the low-temperature-resistant sealing performance of well control products and wellhead devices and the low-temperature-resistant performance of non-metallic and metal materials.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Method for implementing soft DTR (Dynamic Thermal Rating) technology based on semi-parameter adjustment model
InactiveCN104392112AAvoid Accuracy ImpactSolve core technical difficultiesSpecial data processing applicationsElectrical resistance and conductanceCarrying capacity
The invention discloses a method for implementing a soft DTR (Dynamic Thermal Rating) technology based on a semi-parameter adjustment model. The method comprises the following steps of S100, decoupling a state variable according to characteristics of a measurement equation; S200, according to the decoupled state variable, estimating voltage and current carrying capacity of two ends of a power transmission line in a continuous time bucket on the basis of the measurement equation; S300, taking an estimated value of the current carrying capacity in the step S200 as a known quantity and carrying out refined estimation on resistance of the power transmission line; S400, obtaining a temperature track of the power transmission line through a known resistance value sequence in the step S300; S500, obtaining the carrying current of the power transmission line and a temperature sequence through the step S200 and the step S400 and estimating an equivalent environment parameter in a heat balance equation of the power transmission line. The method solves the influence of a system error in measurement data on precision of an estimated result, and effectiveness for temperature estimation of the power transmission line is improved.
Owner:UNIV OF JINAN
Thermal rating method of delivery wind-power transmission line
ActiveCN105281330AOvercoming conservatismEnhancing the ability to accept wind powerAc network circuit arrangementsOptimal decisionElectricity
The invention discloses a thermal rating method of a delivery wind-power transmission line. On the basis of a relation of a transmission line lead temperature, a service life, and a sag, an optimal decision model of a transmission line thermal rating value is constructed by using a total fan suspending power caused by transmission line thermal rating value limiting within the expected service life of the transmission line as an objective function and using the conductor thermal balance, transmission line tensile strength loss, and security margin restriction as constraints; current carrying values of the transmission line during all periods are calculated; comparison of the current carrying values with an initial thermal rating value is carried out; if the current carrying values are larger than the initial thermal rating value, fan suspending powers in the objective function during the period are calculated and are accumulated; the conductor temperature and the tensile strength loss of the transmission line are updated; and iteration and repetition are carried out continuously until the time objective function of the expected service life of the transmission line becomes zero and then a to-be-decided content is solved. According to the invention, on the basis of the service life of the transmission line and the security margin demand, the conductor tensile strength loss and sag constraints are constructed, thereby effectively eliminating conservatism of the traditional thermal rating method and effectively enhancing the wind-power receiving capability of the power grid.
Owner:SHANDONG UNIV
Method for determining residual life of fan
InactiveCN109372785AAvoid unexpected breakdownsAvoid major lossesPump controlNon-positive displacement fluid enginesWorking environmentProcess engineering
The invention discloses a method for determining residual life of a fan. The method comprises the following steps that S1, the corresponding relation between the fan life and the fan working environment temperature is obtained; S2, the fan working environment temperature is divided into a plurality of temperature zones, and the fan expected life L corresponding to the temperature zones is converted according to the corresponding relation between the fan life and the fan working environment temperature; S3, the working time of the fan in each temperature zone is obtained; S4, according to the corresponding relation between the fan life and the fan working environment temperature, the working time of the fan in each temperature zone is converted to the working time at the rated temperature;and S5, the residual life of the fan working under the rated temperature is determined. According to the method, the customer can be reminded to replace the fan in time after the residual life of thefan reaches a set value, accidental faults of the fan are prevented, and great loss caused by system accidental shutdown which may occur is avoided.
Owner:SOLAR POWER NETWORK TECHNOLOGY (ZHEJIANG) CO LTD
Intelligent heating system based on big data analysis period and heating method
The invention discloses an intelligent heating system based on a big data analysis period and a heating method, and the technical scheme thereof is that the heating system comprises a controller, a drinking water conduit and a heating box, a part of the pipe body of the drinking water conduit extends into the heating box, the heating box is filled with a heat conductive agent, and the heating boxis provided with a temperature detecting device for detecting the temperature of the heat conductive agent, and a heating device for heating the heat conductive agent. The controller comprises: an obtaining module for acquiring a temperature detection value output by the temperature detecting device; a monitoring module for determining whether the temperature detection value is less than a temperature preset value; and an execution module for controlling the heating device to start to heat the thermal conductive agent to the rated temperature and then closing the heating device when the temperature detection value is less than the temperature preset value.
Owner:HANGZHOU JIEFURUI TECH
Method for eliminating high temperature fault of antiskid brake control device
InactiveCN106547266AImprove cooling effectIncrease the installation heightProgramme controlElectric testing/monitoringDegree CelsiusEngineering
The invention relates to a method for eliminating the high temperature fault of an antiskid brake control device. With the method adopted, the heat dissipation capacity of the antiskid brake control device can be improved under a condition that a shell material is not changed, so that the surface temperature of the shell of the antiskid brake control device can be lower than 100 Celsius degrees under a 70-Celsius degree high-temperature environment and a working condition. Heat dissipation measures are taken under a condition that the 125-Celsius degree rated temperature of existing high-temperature components is not changed, so that the components can work below 100 Celsius degrees. The cost of improvement is lower than the cost of redesign, energy can be saved, and consumption can be reduced. Aluminum is used to manufacture the shell, and heat dissipation grooves are machined in the shell, an installation height between an antiskid brake control device installation surface and an aircraft is increased, and therefore, the heat dissipation capacity of the shell and the antiskid brake control device installation surface can be enhanced, and high temperature faults generated when the antiskid brake control device is used for a long time under the 70-Celsius degree high-temperature environment can be eliminated.
Owner:XIAN AVIATION BRAKE TECH
Trending functions for predicting the health of electric power assets
ActiveCN109785181ATesting dielectric strengthPower network operation systems integrationState of healthElectric power equipment
A method for determining a dynamic rating for a conductive path includes using a sensor to measure a value for a load parameter and selecting a heating process associated with the load parameter. A rated temperature change is changed by removing temperature changes due to a heating process other than the selected heating process to produce an impaired rated temperature change. A thermal load percentage is determined from the impaired rated temperature change. The thermal load percentage and the measured value are then used to determine the dynamic rating for the load parameter. A method also includes measuring a temperature rise, a current, and a voltage on the conductive path multiple times. Using at least two basis functions and the multiple measured temperature rises, currents and voltages, the values for at least two variables are determined. Trends in each variable are determined to determine a condition of electric equipment.
Owner:ROSEMOUNT INC
Method and system for controlling temperature in continuous granulation reaction kettle and medium
ActiveCN114471418AAdequate responseIncrease productivityTemperatue controlChemical/physical/physico-chemical processesTemperature controlEngineering
The invention provides an in-kettle temperature control method and system for a continuous granulation reaction kettle and a medium, and the method comprises the following steps: presetting that the reaction kettle is provided with a plurality of sections of heating chambers, and obtaining the reaction temperature of a lithium battery material and the total section number of the heating chambers; the rated temperature of the lithium battery material flowing out of each section of heating chamber is formulated based on the reaction temperature and the total section number; the current temperature of the lithium battery material flowing out of each section of heating chamber is obtained; the temperature difference between the current temperature of each section of heating chamber and the corresponding rated temperature is calculated; if the absolute value of the temperature difference of the heating chamber is larger than a first preset threshold value, the heating chamber is marked as a reference heating chamber; obtaining current environment data, and calculating the updated rated temperature of each heating chamber through a dynamic adjustment model based on the temperature difference and the remaining section number of the reference heating chamber; and adjusting the heating power of each heating chamber according to the updated rated temperature. According to the invention, the temperature in the kettle can be accurately controlled.
Owner:广东众大智能科技有限公司
Method and system for determining the thermal power line rating
Method for measuring the power line thermal rating or maximum allowable current rating of an overhead power line with respect to a suspended / anchored cable span (2), comprising at least the following steps of:monitoring a motion of at least one point P of said suspended / anchored cable span (2) over a time interval;monitoring actual line current I, in A, over said time interval;determining an actual sag of said suspended / anchored cable, as a variable of actual line current;measuring or determining the effective wind speed of said suspended / anchored cable span (2) over said time interval;determining a sag reserve DF, in m, for thermal rating, which is the distance between the actual sag and a maximum allowable sag;determining the rate of change, tan(α), in m / A2, of the actual sag versus the square of the line current for the effective wind speed;anddetermining the power line thermal rating of the overhead power line, or ampacity, linked to a corresponding safety clearance, at measured or determined effective wind speed, by adding the square of actual current I to the ratio of the sag reserve DF by the sag rate of change, tan(α), at the effective wind speed, and taking the square root of that addition, i.e.Ampacity=I2+DFtan(α),wherein ampacity is in amperes.
Owner:AMPACIMON
Incorporated device and method for controlling incorporated device
InactiveUS20170324103A1Inhibit temperature riseSuppress in life of electrodeCellsPhotography auxillary processesElectrical batteryReference current
Provided is an incorporated device that incorporates therein an electrolytic cell and a power control device that is capable of suppressing temperature rise in the electrolytic cell to thereby suppress a reduction in the life of electrodes, and a method for controlling an incorporated device. The incorporated device incorporates therein an electrolytic cell and a power control device that is capable of suppressing temperature rise in the electrolytic cell to thereby suppress a reduction in the life of electrodes. The power control device includes: a voltage-current control circuit that supplies, in a constant current control mode, an electrolysis current to the electrolytic cell while the voltage-current control circuit controls the electrolysis current not to exceed a current value of a reference current, the current value of the reference current being preliminary set according to a rated current of a unit cell constituting the electrolytic cell; and a temperature detecting part that detects an environmental temperature of an outside of the electrolytic cell, the environmental temperature being a temperature of an inside of the incorporated device. The voltage-current control circuit stops supply of the electrolysis current when a detected temperature of the temperature detecting part falls outside of a preliminarily set rated temperature range, and resumes supply of the electrolysis current when the detected temperature of the temperature detecting part returns within the rated temperature range.
Owner:MORINAGA MILK IND CO LTD
Self-adaptive overload protection action method for overhead transmission lines
ActiveCN105322515AFully consider the transient temperature rise processTrue reflection of heat accumulation effectEmergency protective circuit arrangementsSelf adaptiveThermal rating
The invention relates to a self-adaptive overload protection action method for overhead transmission lines, and belongs to the technical field of electric power system protection and control. In the method, whether ultimate temperature, emergency temperature or warning temperature is reached is judged according to maximum line temperature obtained according to the collection of the overhead transmission lines and transformer substations; when the maximum line temperature exceeds the ultimate temperature, the lines are cut off immediately; when the maximum line temperature exceeds the emergency temperature and is lower than the ultimate temperature, time-temperature product is accumulated in real time, and if the time-temperature product exceeds line emergency thermal rating, export tripping is performed through self-adaptive overload protection; and when the maximum line temperature exceeds the warning temperature and is lower than the emergency temperature, a pre-warning report is sent to a dispatching center. The method disclosed by the invention can overcome the defect that traditional overload protection setting value is conserved and single in setting by taking full advantage of the maximum line temperature of the transmission lines obtained through collection and calculation, so that the reliability of overload protection is improved, and safe operation of the lines is guaranteed to the maximum extent.
Owner:TSINGHUA UNIV +2
Method for improving security of outdoor power distribution
ActiveCN108963830AIncrease contact areaEasy maintenanceBatteries circuit arrangementsSubstation/switching arrangement cooling/ventilationElectricityCells panel
The invention relates to a method for improving the security of outdoor power distribution, and relates to the field of power distribution cabinets. The method comprises the following steps that S1) asolar cell panel is installed in the top of a high-voltage power distribution cabinet, and charges a storage battery; S2) the storage battery is electrically connected with a controller, a fan is installed in the lateral side of the high voltage power distribution cabinet, and electrically connected with the controller, and a temperature sensor is installed outside the high voltage power distribution cabinet, and used to monitor the temperature of the high voltage power distribution cabinet; and S3) an automatic dry powder fire extinguisher is installed in the lateral side of the high voltagepower distribution cabinet and electrically connected with the controller, when the temperature detected by the temperature sensor in S2 of the high voltage power distribution cabinet reaches a ratedtemperature, the controller controls the automatic fire extinguisher to carry out fire extinguishing on the high voltage power distribution cabinet. Thus, the high voltage power distribution cabinetitself is improved via external equipment protection, the rate of fire hazards of the high voltage power distribution cabinet is reduced greatly, and the using effect is better.
Owner:扬州正扬电力科技有限公司 +1
Energy-saving control system and method for ship sea water pumps
InactiveCN107193301AChange the size of the speedChange speedTemperature control using electric meansControllers with particular characteristicsFrequency changerAnti jamming
The invention provides an energy-saving control system and method for ship sea water pumps. The sea water pumps are driven by adopting frequency converters, one sea water pump is in the running state, and the other sea water pumps are in the standby state; a temperature sensor is arranged at a cooling fresh water outlet and detects the real-time temperature of the cooling fresh water; a control unit presets the rated temperature; the control unit judges whether the real-time temperature is larger than the rated temperature or not; when the real-time temperature is larger than the rated temperature, the control unit controls the frequency converter of any sea water pump to increase the running frequency. The energy-saving control system and method have the advantages that the performance is excellent, the control mode is flexible, the anti-jamming capability is high, work is stable and reliable, and the full-automation unattended operation is achieved; lossless water pump motor rotating speed regulation is achieved, stepless regulation of the water flow from zero to the maximum is achieved, and the system works in the best energy-saving state all the time.
Owner:SHANGHAI CSR HANGE SHIPPING ENG
Thermal design evaluation method and device for base station
ActiveCN108882280ATake advantage of decentralizationEasy to implementWireless communicationWorking temperatureEngineering
The embodiment of the invention provides a thermal design evaluation method and device for a base station, the base station comprises a board card, the board card comprises chips distributed at different positions, and the method comprises the following steps: determining a heat-sensitive position of the base station; acquiring a working temperature of a chip corresponding to the heat-sensitive position and acquiring a rated temperature of the chip corresponding to the heat-sensitive position; generating a characteristic function according to the working temperature and the rated temperature;and determining whether thermal design of the base station meets requirements or not by adopting the characteristic function. The method adopts the characteristic function for determining a fact thatwhether the thermal design of the base station meets the requirements, thus dispersibility of test data is effectively utilized; the method is easy to implement, thus design difficulty and cost are effectively reduced; and under some extreme conditions, if the actual thermal design can not meet a derating requirement but meets a rated requirement, risk information of a product in the scene is quantitatively given, and more bases are provided for decision making.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Real-time temperature monitoring system of directional medicine penetration therapeutic instrument
InactiveCN111053967AReal-time monitoring of temperature changesElectrotherapyMedical devicesMonitoring temperatureThermal rating
The invention provides a real-time temperature monitoring system of a directional medicine penetration therapeutic instrument. According to the invention, a temperature sensor is additionally arrangedin an electrode sheet, can monitor the temperature change in the electrode sheet in real time, and can feed back the real-time monitoring temperature to a controller, the rated temperature is presetin the controller, and the controller controls a constant temperature control circuit to reduce or increase the output voltage to drive a heating device by comparing the monitoring temperature with the rated temperature; and the temperature sensor can monitor the temperature of the electrode sheet in real time and adjust the power supply duty ratio of the heating electrode sheet according to the temperature fed back by the electrode sheet, so that the fall between the monitored temperature and the rated temperature of the electrode sheet is not too large.
Owner:郑州康宜健医疗器械有限责任公司
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