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35results about "Apparent power measurement" patented technology
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Method and device for recognition of power load and electric appliance types and statistics of electric quantities of different electric appliances
InactiveCN106872824AReal-time monitoring of power consumptionAchieve energy saving and emission reductionSpectral/fourier analysisElectric devicesPower flowPower grid
The invention discloses a method and device for the recognition of power load and electric appliance types and the statistics of electric quantities of different electric appliances. The method comprises the steps: carrying out the sampling of a high-voltage signal and a large-current signal of one side of a power grid, carrying out the analysis of the employed data, recognizing an electric appliance in use in the power grid, monitoring the electric quantity of each type of electric appliance in real time, finding the electric appliance which wastes the electric energy according to the monitoring result, and taking the further measures to achieve the energy saving and emission reduction.
Owner:宁波华创锐科智能科技有限公司
Portable ring network cabinet data tour inspection acquisition method based on internet of things information integration
The invention provides a portable ring network cabinet data tour inspection acquisition method based on internet of things information integration. The portable ring network cabinet data tour inspection acquisition method is characterized by comprising the steps of data acquisition, data inquiring and downloading and data analysis. Signals are transmitted to a portable handheld terminal by utilizing a wifi network environment based on an existing data acquisition module and an uploading module of electrical parameter monitoring equipment and an intelligent switch cabinet, a temperature sensing device of a ring network cabinet electrical equipment temperature monitoring device and an acquisition device, a central processor device and a heating / heat-radiating device of an electrical equipment operation environment regulation and control method and system, and then the portable handheld terminal performs setting and control so as to meet the tour inspection requirements of a ring network cabinet and thus the portable ring network cabinet data tour inspection acquisition method based on internet of things information integration has advantages of being scientific and reasonable, high in applicability and excellent in effect.
Owner:NORTHEAST DIANLI UNIVERSITY
Relay protection device based on 12-bit AD in SOC chip
ActiveCN106053931AImprove reliabilitySatisfy the use of internal assessmentElectric devicesEmergency protective arrangements for automatic disconnectionFour quadrantsPower factor
Aiming at problems that cost of a traditional relay protection device is high, acquisition precision is not high, measurement data is not complete and measured electric energy precision is low, the invention provides a relay protection device based on a 12-bit AD in a SOC chip. A technical scheme is characterized in that a power grid frequency is stored in a CPU module; the CPU module reads a frequency value and makes an acquisition frequency of an AD module which collects data in a period be consistent with a frequency of one period in a power grid; an ADC port in the AD module works under a multi-loop acquisition mode; a pulse counting method is used to accumulate electric energy and time 10ms is taken as a statistics period; an accumulation result is divided into two integers which are stored in an RAM; and one integer stores a pulse value and another integer stores an integer electrical degree. In the invention, a hardware circuit is simplified; under the condition that CT is measured, measured values of active power, reactive power, apparent power, a power factor and four-quadrant electric energy can be provided, and electric energy precision can reach a 0.5S grade.
Owner:HENAN SENIOR ELECTRIC +1
Bidirectional measurement device of electric quantity parameters of distributed photovoltaic grid-connected system
ActiveCN105870974AAccurate measurement of active powerAccurate measurement of reactive powerElectric devicesSingle network parallel feeding arrangementsMicrocontrollerMicrocomputer
The invention provides a bidirectional measurement device of electric quantity parameters of a distributed photovoltaic grid-connected system. The bidirectional measurement device comprises a single chip microcomputer, an alternating-current electric energy measurement circuit and a serial communication interface, wherein the single chip microcomputer is connected with the alternating-current electric energy measurement circuit and the serial communication interface respectively; the alternating-current electric energy measurement circuit comprises an electric energy metering chip CS5463, an alternating-current voltage acquisition unit and an alternating-current current acquisition unit; the alternating-current voltage acquisition unit is connected between a power distribution network and a power utilization network; the alternating-current current acquisition unit is connected between the power distribution network and the power utilization network; the electric energy metering chip CS5463 is connected with the alternating-current voltage acquisition unit and the alternating-current current acquisition unit respectively; the single chip microcomputer adopts a chip STC12C5A60S2, and is further connected with output voltage and output current of a photovoltaic module.
Owner:东台市智创精密制造产业园投资有限公司
Power level identification circuit, power level flag circuit and power level supply system
ActiveUS20140333288A1Measurement using dc-ac conversionMeasurement using ac-dc conversionElectric powerVIT signals
A power level identification circuit includes a power interface, a voltage conversion unit, a waveform detection unit, a signal pre-processing unit and a processing unit. The power interface receives electrical power and first signals indicating a level of the power. The voltage conversion unit receives the power from the power interface and converts the power. The waveform detection unit filters the power and obtains the first signals indicating power level. The signal pre-processing unit shapes the waveform of the first signals indicating power level and thereby generates second signals indicating power level. The processing unit identifies a level of the second signals indicating power level and switches to one of modes of the power level identification circuit corresponding to the identified level of the second signals indicating power level. A power level flag circuit and a power level supply system are also provided.
Owner:CLOUD NETWORK TECH SINGAPORE PTE LTD
Power flow measurement and management
ActiveUS8892268B2Avoid flowContinuous measurementElectric signal transmission systemsLevel controlElectricityPower flow
Methods and systems for measuring and / or managing power consumption by power units connected to an electricity distribution network are disclosed. Power flow to and / or from a power unit connected to an electricity distribution network is controlled in accordance with a control sequence, such that the consumption and / or provision of power by the power unit results in a power flow having a predefined flow pattern, and having a characteristic, such as an amplitude, which can be remotely measured. This measurement may be performed using a method in which a signal indicative of power flowing at a measurement node is measured and correlated with a predefined pattern, and a characteristic of the correlated signal is measured. Thus, power flow characteristics resulting from a group of one or more power flow devices can be remotely detected and measured.
Owner:REACTIVE TECH
Electric power measuring system
ActiveUS20170016942A1Improve measurement reliabilityReduce the amount of calculationCurrent/voltage measurementPower measurement by digital techniqueLow voltageMeasuring instrument
Embodiments of an electric power measuring system capable of computing accurate electric power information using a low voltage measuring instrument in a small-scale electric power system are provided. The electric power measuring system may include a first measuring instrument for measuring and detecting a current and a zero-cross point from a distribution line and for generating and outputting current information of the distribution line from the current and the zero-cross point, and a second measuring instrument for computing electric power information of the distribution line according to a voltage thereof and the current information output from the first measuring instrument.
Owner:LSIS CO LTD
Method for evaluating small current variable by apparent power
ActiveCN110988453AConvenient for security workAvoid tripping and power outagesTesting dielectric strengthElectric devicesSecurity checkCoulometer
The invention discloses a method for evaluating a small current variable by apparent power, and belongs to the technical field of electromagnetic measurement. The method comprises the steps of S1, detecting a small current on a line; S2, collecting the current detected in the step S1, and multiplying the current by a given apparent voltage to obtain apparent power; S3, accumulating the apparent power obtained in the step S2 in real time to obtain apparent electric quantity; and S4, reading the apparent electric quantity in the step S3 once at an interval T, calculating the variation of the apparent electric quantity in each time period, comparing the relative variation amplitude of the apparent electric quantity variations in two adjacent time periods, and making a decision of continuing to detect or report according to the relative variation amplitude. According to the judgment method, the change trend of the damage energy in the line is automatically judged according to the change amplitude of the apparent electric quantity in the adjacent same-length time periods, the development situation of the damage energy is mastered, and an early warning signal is given when the increase amplitude is large, so that workers are reminded to take security check measures, safe production is ensured, the waste of raw materials is avoided, and the loss is reduced.
Owner:山东计保电气有限公司
Malignant load identification method, device and equipment, and storage medium
PendingCN112816816AImprove recognition accuracyElectric devicesElectrical testingIdentification devicePower usage
The embodiment of the invention discloses a malignant load identification method. The method comprises the following steps: acquiring power utilization parameters of power utilization equipment at a plurality of moments; determining reactive power at each moment based on the power utilization parameters at each moment; and outputting a malignant load identification signal when the change of the reactive power at the plurality of moments does not meet a first change condition, wherein the malignant load identification signal is used for representing that the electric equipment is a malignant load. The embodiment of the invention also discloses a malignant load identification device, malignant load identification equipment and a storage medium.
Owner:无锡小净共享网络科技有限公司
Multi-phase electric energy meter, counting method thereof and computer readable storage medium
PendingCN114200204AReduce lossElectric devicesPower measurement by digital techniquePulse numberComputational physics
The invention discloses a multiphase electric energy meter, a counting method thereof and a computer readable storage medium, and relates to the field of electric energy meters, and the counting method comprises the steps: obtaining a plurality of pulse interruptions transmitted by an external metering unit in a first time period; according to the multiple pulse interruptions, the number of active pulses, the number of reactive pulses and the number of apparent pulses are obtained through calculation; according to a power integral weight obtained by the external metering unit in a first time period, classifying the active pulse number, the reactive pulse number and the apparent pulse number according to phases of a preset phase information set to obtain a pulse distribution result; according to the pulse distribution result, active electric energy, reactive electric energy and apparent electric energy corresponding to the phase information set are obtained through calculation. Various types of electric energy calculation can be carried out internally through the pulse number, frequent access with an external metering unit is not needed, and loss of electric energy counting is reduced.
Owner:CLOU GLOBAL TECH CO LTD
Method and system for measuring frequency characteristic of iron core of dry-type voltage transformer
PendingCN113419125ATo achieve the purpose of frequency characteristic measurementElectric devicesResistance/reactance/impedenceConstant frequencyTransformer
The invention relates to the technical field of power transformation equipment, in particular to a method for measuring frequency characteristics of an iron core of a dry-type voltage transformer. The signal generator applies voltage with constant amplitude and adjustable frequency to the iron core, current, active power, reactive power, apparent power and power factors under different frequencies are obtained from the power analyzer, and the purpose of measuring the frequency characteristic of the iron core is achieved. The obtained data is calculated and analyzed to obtain the influence of the frequency on the iron core loss and the iron core magnetic conductivity. The method has guiding significance in the aspect of researching the influence of harmonic waves on the measurement precision of the dry-type voltage transformer.
Owner:HARBIN UNIV OF SCI & TECH
Non-linear power measurement and analysis recorder
PendingCN107991529AEasy to adjustAccurate measurementElectric devicesPower measurement by digital techniqueSignal conditioning circuitsCurrent range
The invention relates to a non-linear power measurement and analysis recorder. The non-linear power measurement and analysis recorder comprises a signal sampling unit, a signal conditioning unit, a range selection unit, an analog-digital conversion unit, an electric isolation unit and a metering subsystem, wherein the signal sampling unit comprises multiple signal sampling circuits; the signal conditioning unit comprises multiple signal conditioning circuits; the range selection unit comprises multiple range switches; the metering subsystem is used for measurement to obtain a value of a sampled signal, controlling one range switch to be switched on according to the value and detecting whether the value of the sampled signal is in the current measuring range, when the value of the sampled signal is in the current measuring range, switching-on of the current range switch is kept, otherwise, the current range switch is controlled to be switched off, and another range switch is controlledto be switched on. Continuous rapid adjustment for the range is realized, and the recorder can be adaptive to non-linear waveform measurement, so that current or voltage measurement is more accurate.
Owner:GUANGDONG ORIENT TELECOMM TECH
Intelligent electricity larceny prevention integrated management system and method
PendingCN110246054AEnergy savingImprove securityData processing applicationsElectric devicesTransformerData acquisition
The invention provides an intelligent electricity larceny prevention integrated management system and method. The device comprises a data collector arranged at a primary side incoming line of a transformer or on an overhead line or a drop-out switch. The data receiver is used for receiving the data; and a load monitoring system master station, the data collector collects primary side three-phase current data; the three-phase current data is sent to a data receiver through a wireless channel; the data receiver uploads power utilization information to the load monitoring system master station through a bus. The load monitoring system master station is configured to obtain uploaded primary side data, and screen out generated power consumption abnormity by comparing the primary side data of the special transformer with a load curve counted by an electric energy meter arranged at a terminal of a corresponding user so as to realize real-time monitoring of the power consumption state of the user.
Owner:ELECTRIC POWER RES INST OF EAST INNER MONGOLIA ELECTRIC POWER +1
Electric power measuring system
ActiveUS9863986B2Accurate informationImprove measurement reliabilityElectric devicesCurrent/voltage measurementMeasuring instrumentLow voltage
Embodiments of an electric power measuring system capable of computing accurate electric power information using a low voltage measuring instrument in a small-scale electric power system are provided. The electric power measuring system may include a first measuring instrument for measuring and detecting a current and a zero-cross point from a distribution line and for generating and outputting current information of the distribution line from the current and the zero-cross point, and a second measuring instrument for computing electric power information of the distribution line according to a voltage thereof and the current information output from the first measuring instrument.
Owner:LSIS CO LTD
Platform for monitoring low current by apparent power and processing in real time
PendingCN110988455ADestruction Energy EliminationAvoid tripping and power outagesTesting dielectric strengthElectric devicesPower sensorCurrent sensor
The invention discloses a platform for monitoring low current by apparent power and processing in real time, and belongs to the technical field of electromagnetic measurement. The current on a line isdetected by a current sensor; a current sampling circuit in an apparent power sensor collects the detected current; an arithmetic unit multiplies the collected current by a given apparent voltage toobtain apparent power, and accumulates the apparent power in real time to obtain apparent electric quantity; a central processing unit reads the apparent electric quantity according to a set time interval, calculates the variation of the apparent electric quantity in each time period, compares the relative variation amplitude of the apparent electric quantity variations in two adjacent time periods, and makes a decision of continuing to detect or report to a host; and the host gives an alarm after receiving the alarm signal. The platform judges the change trend of damage energy in the line according to the change amplitude of the apparent electric quantity in the adjacent same-length time periods, and can give an early warning signal to remind a worker to take security check measures whenthe increase amplitude of the apparent electric quantity is large.
Owner:山东计保电气有限公司
Monitoring system
InactiveUS20200292596A1Batteries circuit arrangementsElectric devicesMonitoring systemControl theory
The monitoring system includes: a management server, and a transmission device which obtains, from the power storage system, first charged power index values indicating charged power of the power storage system and input / output power index values indicating input / output power from the power receiving point to which the power storage system is connected to a system, and transmits the index values to the management server via a network. The management server includes: a calculation part which calculates, based on the first charged power index values and the input / output power index values, second charged power index values indicating power charged by generated power of the power generation system connected to the power receiving point of charged power of the power storage system; and a diagnosis part which diagnoses presence or absence of abnormality of the power generation system based on the second charged power index values calculated by the calculation part.
Owner:ORMON CORP
Subsynchronous oscillation monitoring method and device
PendingCN114487537AHazardous operabilityHazardous lifeSpectral/fourier analysisElectric devicesPower gridIntensive care medicine
The embodiment of the invention provides a subsynchronous oscillation monitoring method and device. The subsynchronous oscillation monitoring method comprises the following steps: determining a subsynchronous component signal from a detected electric signal; calculating a subsynchronous comprehensive effective value according to the determined subsynchronous component signal; and judging whether subsynchronous oscillation occurs or not according to the calculated subsynchronous comprehensive effective value. According to the embodiment of the invention, whether subsynchronous oscillation occurs or not can be accurately monitored, so that subsequent targeted treatment is facilitated, and the safety operation and service life of a power grid and a generator set are prevented from being harmed.
Owner:BEIFANG WEIJIAMAO COAL POWER CO LTD
Device for evaluating small current variable by apparent power
PendingCN110988456ADestruction Energy EliminationAvoid tripping and power outagesTesting dielectric strengthElectric devicesPower sensorCurrent sensor
The invention discloses a device for evaluating a small current variable by apparent power, and belongs to the technical field of electromagnetic measurement. The device comprises a current sensor, and is characterized in that the current sensor is used for detecting the current on a line; a current sampling circuit in an apparent power sensor collects the detected current; an arithmetic unit multiplies the collected current by a given apparent voltage to obtain apparent power, and accumulates the apparent power in real time to obtain apparent electric quantity; and a central processing unit reads the apparent electric quantity according to a set time interval, calculates the variation of the apparent electric quantity in each time period, compares the relative variation amplitude of the apparent electric quantity variations in two adjacent time periods, and makes a decision of continuing to detect or report the information. The judgment device judges the change trend of damage energyin the line according to the change amplitude of the apparent electric quantity in the adjacent same-length time periods, and can upload a signal when the increase amplitude of the apparent electric quantity is relatively large so as to remind a worker to take security check measures.
Owner:山东计保电气有限公司
Non-intrusive load identification method fusing transient and steady state characteristics
PendingCN114709926AImprove load identification accuracyElectric devicesArtificial lifeTransient stateFeature vector
The invention discloses a non-intrusive load identification method fusing transient and steady state characteristics, which comprises the following steps of: acquiring voltage and current data when a load operates, thereby acquiring a power sequence of the load, including active power, reactive power and apparent power; detecting the switching state of the load by adopting a sliding window algorithm, and separating transient data and steady state data of the load; required electrical characteristic quantities are extracted from the obtained transient state data and steady state data respectively, and respective characteristic vectors are obtained; inputting the transient feature vectors into a trained XGBoost model, and inputting the steady-state feature vectors into a trained random forest RF model to obtain respective recognition results; basic probability allocation (BPA) is constructed according to the classification recognition result, and fusion is carried out by adopting a D-S evidence theory to obtain a final recognition result; more information of the electric equipment is utilized, and the load identification precision is improved.
Owner:GUIZHOU POWER GRID CO LTD
Monitor small currents with apparent power and deal with them in real time
ActiveCN110988454BDestruction Energy EliminationAvoid tripping and power outagesTesting dielectric strengthElectric devicesSecurity MeasureEngineering
The invention discloses a method of using apparent power to monitor a small current and dispose of it in real time, which belongs to the technical field of electromagnetic measurement, and comprises the steps of S1: detecting the tiny current on the line; S2: collecting the current detected by S1, and then multiplying it by The given apparent voltage is the apparent power; S3: accumulate the apparent power obtained in S2 in real time to obtain the apparent power; S4: read the apparent power in S3 every interval T, and calculate the apparent power in The change in each time period is compared with the relative change range of the apparent power change in two adjacent time periods, and a decision to continue detection or report to the host is made based on the relative change range. This method judges the change trend of the destructive energy in the line according to the change range of the apparent power in two adjacent periods of the same length, grasps its development trend, and gives an early warning signal when the increase range is large, reminding the staff to take security measures , avoid waste of raw materials caused by power outages, and ensure safe production.
Owner:山东计保电气有限公司 +1
A method and system for monitoring energy efficiency of power supply and consumption in green industrial parks and identifying fault responsibilities
ActiveCN107991525BGain a comprehensive view of power qualityImprove power qualityElectric devicesElectrical testingPower qualityWorkstation
Owner:WUHAN UNIV
Power level identification circuit, power level flag circuit and power level supply system
Owner:CLOUD NETWORK TECH SINGAPORE PTE LTD
Distribution transformer terminal power consumption measuring circuit and distribution transformer terminal
PendingCN111650433AReduce the number of wiringReduce Power Measurement ErrorsElectric devicesPower measurement by digital techniquePhase currentsDistribution transformer
The invention relates to a distribution transformer terminal power consumption measuring circuit and a distribution transformer terminal, and belongs to the technical field of distribution transformerterminal intellectualization. The circuit comprises a voltage power consumption measuring circuit and / or a current power consumption measuring circuit. The voltage power consumption measuring circuitcomprises a first metering chip, a current transformer used for measuring each phase of current, and a voltage transformer used for measuring each phase of voltage. The first metering chip is used for calculating the voltage power consumption of each phase according to the acquired voltage and current of each phase of the three-phase voltage of the distribution transformer terminal. The current power consumption measuring circuit comprises a second voltage division circuit and a second metering chip, and the second metering chip is used for calculating the current power consumption of each phase according to the acquired voltage of each phase of the three-phase current of the distribution transformer terminal in combination with the applied current, so that the problems of repeated wiring, poor precision and low efficiency in the power consumption detection process of the distribution transformer terminal are solved.
Owner:STATE GRID CORP OF CHINA +2
An information system architecture management system
ActiveCN111682967BRealize visual managementImprovement of IT operation and maintenance capabilitiesElectric devicesCurrent/voltage measurementIt equipmentIntelligent equipment
The present invention provides an information system architecture management system, including a background management system, a mobile client, a load monitoring subsystem, an intelligent device in a computer room, an environment scanning device in a computer room, and IT equipment, and the IT equipment includes a management system server, an information system server, and a routing device , the intelligent equipment in the computer room includes the intelligent cabinet, the information system server is set in the intelligent cabinet, the background management system runs on the management system server, the management system server and the information system server are connected through the internal network, and the load monitoring subsystem is deployed on the core node of the network and communicates with the The background management system is connected. The computer room environment scanning equipment is used to scan the computer room environment to obtain the computer room modeling data. The background management system is used to realize the three-dimensional display and management of the internal environment of the computer room, IT equipment and resources. The mobile client and the background management system are connected through the network. connected.
Owner:海南电网有限责任公司
Three-phase circuit data measurement and control device
PendingCN114137295AReach protectionCapacitor keeps runningPower measurement by digital techniqueFrequency measurement arrangementCommunication interfaceWireless transceiver
The invention discloses a three-phase circuit data measurement and control device which structurally comprises a display screen, a wiring terminal, an operation box, a control button and an RS485 communication interface, the wiring terminal is arranged on the operation box and movably clamped with the operation box, the display screen is arranged on the operation box and connected with the operation box, the control button is installed on the operation box, and the RS485 communication interface is connected with the control button. The wireless transceiver is connected with the upper computer, the wireless transceiver is connected with the upper computer, the control button is arranged on the wireless transceiver, the operation box is movably connected with the control button, the operation box is provided with an RS485 communication interface, the RS485 communication interface is connected with the operation box, and the RS485 communication interface is connected with equipment in a shielded twisted pair and hand-in-hand serial connection mode. Due to the fact that the processing module can achieve timing control over the implementation time of various operations, time-sharing charging and event recording can be achieved, records can be transmitted to the upper computer so as to further record and conclude switching quantity displacement, fault items, protection items and the like, and through timing control, each type of records of the recorded events is not less than 100 in the recording process.
Owner:TAIZHOU ANJPOWER EQUIP
System component in an imaging system
InactiveUS20200150161A1Increase profitElectric devicesDiagnostic recording/measuringMedicineEngineering
Systems and methods are provided for determining a use of a system component in an imaging system. The imaging system includes a primary side configured to provide power to the system component and a secondary side including the system component that uses the power provided by the primary side during the image sequence. The method includes determining the use of the system component during an imaging sequence, determining a time averaged power provided by the primary side during the imaging sequence, determining a maximum time averaged power that may be provided by the primary side until a temperature limit is reached on the primary side. Further, whether the time averaged power is smaller than the maximum time averaged power is determined.
Owner:SIEMENS HEALTHCARE GMBH
Micro-current apparent power sensing method and device
PendingCN111007311AEasy security measuresAvoid tripping and power outagesTesting dielectric strengthElectric devicesOvercurrentEngineering
The invention discloses a micro-current apparent power sensing method and a device, and belongs to the technical field of electromagnetic measurement, and the method comprises the steps: S1, detectinga grounding wire, a grounding lead of an insulating part or a micro-current on a zero-sequence current line, and obtaining a current on a corresponding line; S2, carrying out current acquisition on the micro current detected in the step S1, and multiplying the micro current by a pre-judged given apparent voltage to obtain apparent power; and S3, accumulating the apparent power obtained in the S2in real time to obtain the apparent electric quantity. According to the method, the grounding small current, the insulation current or the leakage current can be converted into an apparent electric quantity form accumulated along with time, so that the change trend of the electric power destructive power can be considered in a time period, necessary security check measures can be taken conveniently, disordered power failure is avoided, and an electric power foundation is laid for guaranteeing normal production.
Owner:山东计保电气有限公司
Power load switching point detection method and device
PendingCN113899944AResolve indistinguishableJudgment based on comprehensiveElectric devicesApparent power measurementControl theoryElectric power
The invention discloses a power load switching point detection method and device. The method comprises the steps of obtaining first electric quantity data, and carrying out the normalization processing of the first electric quantity data, and obtaining second electric quantity data, performing N-layer discrete wavelet transform calculation on the second electric quantity data to obtain a suspected switching point, wherein N is a positive integer, when the load type of the first electric quantity data is unknown, inputting the suspected switching point into a load switching point identification model, so that the load switching point identification model identifies the suspected switching point to obtain an identification result, and judging whether the suspected switching point is a power load switching point or not according to an identification result. By adopting the embodiment of the invention, the accuracy of detecting the switching point of the household appliance can be improved.
Owner:GUANGDONG POWER GRID CO LTD +1
Three-phase circuit measurement and control diagnosis device
PendingCN114137296AAvoid failureReduce failurePower measurement by digital techniqueFrequency measurement arrangementPower factorControl engineering
The invention discloses a three-phase circuit measurement and control diagnosis device which is structurally provided with a circuit box, a mounting frame, a cover opening door, a heat dissipation opening and a top plate, the mounting frame is fixedly connected to the bottom position of the outer side of the circuit box in an embedded mode, and the cover opening door is arranged on the front side of the circuit box and connected with a three-phase circuit through a three-phase connection opening. The calculation frequency converter can calculate analog quantities such as active power, reactive power, apparent power, power factors and frequency, and is matched with a three-phase circuit to perform current value conversion, so that the electric load can be conveniently adjusted to be in a balanced state, and faults caused by overlarge voltage are effectively avoided; when a three-phase circuit converts a current value, the open-phase protector carries out voltage or current open-phase and phase sequence diagnosis and is matched with an overload detection end to further monitor frequency overrun, so that faults such as short circuit, overload and zero line breaking can be judged and timely disconnection can be carried out, and faults caused by current and voltage changes of the three-phase circuit are reduced.
Owner:TAIZHOU ANJPOWER EQUIP
A method of judging small current variables with apparent power
ActiveCN110988453BConvenient for security workAvoid tripping and power outagesTesting dielectric strengthElectric devicesCoulometerEarly warning signs
The invention discloses a method for judging small current variables by using apparent power, belonging to the technical field of electromagnetic measurement. Determine the apparent voltage to obtain the apparent power; S3: Accumulate the apparent power obtained in S2 in real time to obtain the apparent power; S4: Read the apparent power in S3 once every interval time T, and calculate the apparent power in For the change in each time period, the relative change range of the apparent power change in two adjacent time periods is compared, and a decision to continue detection or reporting is made according to the relative change range. This evaluation method automatically judges the change trend of the damage energy in the line according to the change range of the apparent power in the adjacent same length period, grasps its development trend, gives an early warning signal when the increase range is large, and reminds the staff to take security checks. Measures to ensure safe production, avoid waste of raw materials and reduce losses.
Owner:山东计保电气有限公司
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