40results about "Power factor measurement" patented technology

An electric meter (100) comprising a non-invasive voltage measurement sensor (12), one or more non-invasive current measurement sensors (14A-14C) for measuring one or more phase currents, and a digital processing unit (10). The voltage measurement sensor (12) and the current measurement sensors (14A-14C) are connected or connectable to the processing unit (10). The processing unit (10) is configured, in a calibration mode, to determine phase shift values between a first voltage sensor signal and first current sensor signals, and to store the phase shift values into a memory. The processing unit (10) is configured, in an operation mode, to determine a second voltage sensor signal, determine voltage estimates based on the second voltage sensor signal and the stored phase shifts, and determine, based on the voltage estimates and second current sensor signals determined by the current measurement sensors (14A-14C), respectively, one or more electric power values.

The application discloses a kind of photovoltaic inverter MPPT efficiency evaluation method, system and storage medium, respectively to measured voltage and measured current are evaluated, then using the result of respective independent evaluation to determine final MPPT efficiency result, compared with the way of traditional direct calculation power then evaluation, effectively reduce the degree of being influenced by output error.And, in the process of processing respectively, by respectively to measured voltage and maximum power point corresponding voltage, to measured current and maximum power point corresponding current are calculated deviation, then using deviation calculation result to carry out tracking efficiency calculation mode, can directly fundamentally guarantee that final calculated result will be less than 100%, i.e., it is in reasonable range, and evaluation result also has real meaning, can effectively reflect the work of photovoltaic inverter.

The invention discloses a tunneling equipment high-speed sampling health diagnosis and protection method and an electric control system thereof, and relates to the field of tunneling equipment electric control systems, and the tunneling equipment high-speed sampling health diagnosis and protection method comprises a multi-loop three-phase current transformer, a common-bus three-phase voltage transformer, a high-speed sampler, a processing analyzer, a transmitter, an embedded industrial personal computer and an electric component formed by a controller. By high-speed acquisition and processing of original multi-electric-quantity signals, a traditional electric control system electric quantity sampling analysis mode is replaced, fault pre-warning, fault post-protection and original electric quantity information real-time storage are realized, online advanced pre-warning and protection are realized, offline analysis of high-speed sampled original large-capacity data is realized, functions of a small oscilloscope are integrated, and the system is simple in structure and convenient to use. The tunneling equipment electric control system is innovated, and the tunneling equipment electric control system has new functions of key transmission part degradation condition prediction, power supply network harmonic content analysis, ultra-high-speed original signal sampling, large-capacity data real-time transmission and storage and the like.

The application discloses a kind of transformer explosion-proof and fault monitoring device and method, belong to electric power equipment technical field.The specific device includes transformer oil tank pressure relief module, on-load tap changer pressure relief module, oil and gas separation tank, gas discharge pipeline, nitrogen injection module, transformer protection control cabinet, oil-immersed cable oil tank pressure relief module and transformer module, specific method includes: collecting transformer data;According to the power factor / loss factor of transformer bushing current collected calculation;Set transformer capacitance, power factor / loss factor and the early warning threshold of partial discharge signal and judge whether data reaches corresponding early warning threshold;Any data reaches early warning threshold in judgment result, determine transformer fault, trigger early warning and carry out transformer pressure relief, realize transformer explosion-proof and fault monitoring.The application realizes the pressure relief protection of transformer cable box, on-load tap changer module and main oil tank, and proposes online monitoring and fault diagnosis of key monitoring signals.

The invention relates to the technical field of thermoelectric material testing, and discloses a thermoelectric material testing method and system suitable for a high-intensity magnetic field. The method comprises the following steps: filling a thermoelectric material on a sample table in a sample rod, and vacuumizing the interior of the sample rod; heating the two sides of the sample table at different degrees, measuring the temperature of the two sides of the sample table, establishing a temperature difference, and measuring the voltage value of the thermoelectric material under the temperature difference to obtain a potential difference; performing linear fitting on the temperature difference and the potential difference to obtain a Seebeck coefficient; heating the two sides of the sample table to the same degree to enable the temperatures of the two sides of the sample table to be the same, measuring the resistance value of the thermoelectric material, and calculating the conductivity of the thermoelectric material. According to the invention, the Seebeck coefficient and the conductivity of the sample can be measured in a strong magnetic field.

The invention belongs to the technical field of power failure reason analysis, and particularly relates to an electric vehicle charging identification method, device and equipment and a medium, and the method comprises the steps: collecting an AC voltage signal and a current signal in a power supply loop in real time; calculating a real-time power factor according to the AC voltage signal and the current signal; comparing the real-time power factor with a first threshold value, if the real-time power factor is lower than the first threshold value and the real-time power factor is gradually increased within a preset time, performing fast Fourier transform on the total current signal to obtain a frequency domain signal, and screening a content ratio of target harmonic waves and a total harmonic distortion rate based on the frequency domain signal; comparing the content ratio and the total harmonic distortion rate of the target harmonic with a second threshold value, and if the content ratio and the total harmonic distortion rate of the target harmonic are both higher than the second threshold value, calculating a current peak value fluctuation ratio of current waveform pulsation of the target harmonic based on the content ratio and the total harmonic distortion rate of the target harmonic, and comparing with a third threshold value.

The invention discloses an intelligent load monitoring system of a safety type electric energy metering box, which comprises a data acquisition layer, a data transmission layer, a data intelligent processing layer and an application layer, and is characterized in that the data acquisition layer is provided with an intelligent electric meter, a high-precision sensor and an electric energy quality analysis layer, and the data transmission layer comprises a protocol conversion module, an edge conversion module and a communication module; the intelligent data processing layer comprises data access, data processing, data storage, load analysis and intelligent processing, the application layer comprises real-time monitoring, alarm, management, energy efficiency analysis and report, and the electric energy metering box carries out real-time data monitoring on all components in the metering box, collects detailed energy consumption data in each time period, and carries out real-time monitoring on all the components in the metering box. And the collected real-time data is uploaded to the terminal, and is calculated, classified and counted into a table, so that the real-time load condition of each component in the electric energy metering box can be known in time, and the service life of the electric energy metering box is greatly prolonged under the condition that the long-time safe use of the electric energy metering box is ensured.

The invention provides a method and device for improving the calibration precision of an electricity meter, and belongs to the technical field of electricity meter calibration. The method for improving the calibration precision of the electric meter comprises the following steps: S1, collecting a first real-time voltage and a first real-time current; s2, obtaining a first filtering voltage and a first filtering current; s3, obtaining a correction gain coefficient of the filter; s4, acquiring a voltage calibration coefficient and a current calibration coefficient; s5, collecting a second real-time voltage and a second real-time current; s6, obtaining a second filtering voltage and a second filtering current; s7, calculating and obtaining a voltage and current phase difference calculation value based on the second filtering voltage and the second filtering current; and S8, obtaining a power factor standard value, and calculating and obtaining a phase calibration coefficient based on the power factor standard value and the voltage and current phase difference. The method is simple in calibration process, short in period, high in precision and high in success rate, and production efficiency is greatly improved while product performance indexes are guaranteed.

The invention discloses an automatic test system and method for a feeder terminal, and relates to the technical field of feeder terminal testing, the installation information of the feeder terminal on a feeder line is determined, and a test model is constructed based on the installation information and the feeder line; formulating a plurality of pieces of test scheme information corresponding to the feeder terminal, constructing the plurality of pieces of test scheme information into a plurality of test blocks, and carrying out information binding between the test scheme information and the corresponding test blocks; linkage points are arranged in the multiple test blocks, and a virtual combination of the multiple test blocks is formed through the linkage points; and determining an actual test flow of the feeder terminal, obtaining a virtual combination based on the actual test flow, constructing the virtual combination based on the linkage point to obtain a test line, and automatically testing the feeder terminal according to the test line. According to the invention, the feeder terminal can be continuously tested, a plurality of test types can be combined through the linkage points, test preparation can be rapidly made according to test requirements, and the test of the feeder terminal can be rapidly completed.

The invention belongs to the technical field of power electronic measurement, and discloses a self-calibration type standard load box system and a test method, equipment and medium thereof, so as to solve the problems of precision drift, complex calibration process, incapability of online operation, incomplete measurement parameter display and the like caused by long-term use of the existing load box. The system comprises an impedance main body module which is composed of an adjustable resistor and an adjustable inductor which are adjusted in a numerical control manner and is used for providing a standard impedance load and adjusting a power factor angle; the automatic calibration test device comprises a signal acquisition unit, a signal processing unit, a data processing unit and a display unit which are connected in sequence, and the self-calibration module is used for carrying out automatic precision calibration on the impedance main body module based on the calculation result of the data processing unit. By introducing'measurement-calibration-compensation 'closed-loop control, self errors can be automatically identified and corrected, and the problem of precision drift of traditional equipment caused by component aging and environment change is effectively solved.

The invention discloses a method and a system for testing a power device. The method comprises the following steps: determining a current voltage phase angle and a current current phase angle; outputting a first modulation ratio according to the topological structure of the test-accompanying power conversion circuit, the actual voltage of the test-accompanying power conversion circuit, the reference voltage, the current voltage phase angle and a first proportional-integral control strategy, and outputting a first control signal to the test-accompanying power conversion circuit according to the first modulation ratio; outputting a second modulation ratio according to the topological structure of the tested power conversion circuit, the actual current of the tested power conversion circuit, the reference current, the current current phase angle and a second proportional-integral control strategy, and outputting a second control signal to the tested power conversion circuit according to the topological structure of the tested power conversion circuit, the first modulation ratio and the second modulation ratio; and obtaining temperature information of each tested power device. According to the technical scheme, the power factor can be conveniently adjusted, the test requirements of various working conditions are met, and the test accuracy is improved.

The invention provides an industrial load decomposition method based on harmonic coupling and nonlinear feature fusion, and belongs to the technical field of intelligent power grid monitoring. The method comprises the following steps: acquiring an electrical signal at a main power supply of an industrial load; basic electrical characteristics are extracted based on the electrical signals, and a basic characteristic set is constructed; geometric mean features are determined through the basic electrical features, and a geometric mean feature set and a multi-time scale geometric mean feature set are constructed; combining the basic feature set, the multi-time scale geometric mean feature set and the geometric mean feature set to construct a fusion feature set; training a long-short-term memory network by using the fused feature set; and performing non-intrusive industrial load energy consumption monitoring by using the trained long-short-term memory network. According to the method, the long-short-term memory network is trained by fusing the feature set, and the trained long-short-term memory network set is utilized to carry out non-intrusive load monitoring, so that the energy consumption of each load in the industrial load can be more accurately detected, decomposed and evaluated.

The invention relates to a safety assessment method for an energy storage converter. The method comprises the following steps: acquiring a first-level evaluation index of the energy storage converter, wherein the first-level evaluation index corresponds to at least one second-level evaluation index; constructing a judgment matrix based on the first-level evaluation index to obtain a feature extreme value of the judgment matrix and a feature vector corresponding to the feature extreme value, and performing normalization processing on the feature vector to obtain a weight corresponding to the first-level evaluation index; constructing a fuzzy relation matrix based on a preset reference evaluation vector and a membership degree of a second-level evaluation index, and obtaining a membership degree vector of the first-level evaluation index based on the fuzzy relation matrix and the weight corresponding to the first-level evaluation index; and determining the safety level of the energy storage converter based on the membership degree vector.

Techniques and mechanisms for providing power telemetry information which indicates a total load current from one or more power supply units (PSUs). In an embodiment, a device is coupled to receive a first signal from the current share bus which is coupled to each of multiple PSUs. A voltage level of the first signal represents a target amount of current to be output by each of the one or more PSUs. A second signal is generated based on both the first signal, and on an indication of a scale according to which a primary PSU of the one or more PSUs represents a target amount of current. In another embodiment, an amplification is performed, based on the second signal and on a total number of the one or more PSUs, to generate an Isys signal which indicates a total load current output by the one or more PSUs.

The invention relates to the technical field of electrical parameter measurement, in particular to an electrical parameter real-time acquisition, detection and linkage early warning system and method based on edge calculation. Comprising a data acquisition module used for acquiring current and voltage signals of to-be-detected equipment; the control processing module is used for filtering, calibrating and operating the electric signal acquired by the data acquisition module, and analyzing the running state of the to-be-detected equipment in real time in combination with a preset early warning threshold value; the man-machine interaction module is used for supporting a user to customize detection parameters of the data acquisition module and an early warning threshold value of the control processing module, and displaying a measurement result in real time; and the sound-light alarm module is used for carrying out rapid early warning on the abnormity detected by the control processing module. According to the system and the method, phase voltage, line voltage, phase current, frequency and power factors can be measured, interaction with a touch screen is controlled through a PLC, remote monitoring and management are performed through the Ethernet, the limitation is solved without depending on a traditional detection mode, and meanwhile, multifunctional measurement, data storage and fault early warning are integrated.

The invention relates to the technical field of electric energy meters, and discloses a power utilization abnormity monitoring method and an electric energy meter, and the method comprises the steps: obtaining the active power and power factors of a power utilization branch; monitoring whether the power utilization branch is connected with a malignant load or not according to the increment of the active power in different time periods and the size of a power factor; and after monitoring that the power utilization branch is connected with the malignant load, outputting a first preset exception processing instruction to the protection unit. According to the method and the device, whether the power utilization branch is connected with the malignant load or not can be accurately identified by combining the increment of the active power of the power utilization branch in different time periods and the size of a power factor, so that power utilization protection is performed, and the power utilization safety is improved.

A heating ventilating or air conditioning (HVAC) system includes a unit configured for use in a heating or a cooling operation for an environment. The unit includes an interface configured to receive electric energy from an alternative energy source and a controller configured to perform an optimization of an objective function for the unit to determine a first amount of electric energy to receive from an energy grid and a second amount of the electric energy from the alternative energy source for use in the heating or cooling operation at each time step of an optimization period in response to a cost characteristic of the electric energy received from the energy grid. The unit is configured to use the first amount and the second amount for the heating or cooling operation.

The invention provides a main transformer bushing CT 380V current rising device. The device comprises a three-phase four-wire socket, a first automatic winding and unwinding coil, a low-voltage circuit breaker, a second automatic winding and unwinding coil, a first electric energy quality monitoring module, a second electric energy quality monitoring module and a monitoring host. The three-phase four-wire socket is connected to a 380V maintenance power supply; and the first automatic winding and unwinding coil, the low-voltage circuit breaker and the second automatic winding and unwinding coil form a primary loop. The first monitoring module is connected with a primary line and used for measuring primary side operation data of the transformer. The second module is connected with the secondary side and used for measuring corresponding data. And the monitoring host is used for controlling the on-off of a primary loop, collecting data, judging the phase sequence of a power supply based on the primary side data and judging the health state of the transformer based on the secondary side data so as to verify the correctness of the main transformer bushing CT polarity and the transformation ratio. According to the invention, the verification precision and the test conclusion reliability can be significantly improved by collecting multi-dimensional data and monitoring standardized analysis of the host.

A method for verifying validity of measurement / metering information for DPI-based packet filtering and the distributed energy resource gateway utilizing the method are provided. The measurement / metering information validity verification method includes collecting first measurement / metering information from a smart meter and second measurement / metering information from a smart inverter, calculating the error between the first measurement / metering information and the second measurement / metering information based on the first measurement / metering information, determining whether the error falls within a maximum possible error range, and performing deep packet inspection (DPI) functionality according to the determination result.

The application belongs to the field of short-circuit current detection, and provides a method and system for calculating AC and DC components of short-circuit current, which comprises determining three maximum values based on a waveform diagram of short-circuit current, fitting the relationship among voltage source amplitude, line impedance and transient component amplitude by using the three maximum values, determining the ratio of equivalent resistance and equivalent inductance, determining equivalent resistance and equivalent inductance according to the relationship between line impedance and equivalent resistance and equivalent inductance and the ratio of equivalent resistance and equivalent inductance, determining impedance angle based on the relationship between equivalent resistance and equivalent inductance and impedance angle, determining phase angle by initial conditions of short-circuit current, determining closing phase angle by using the relationship among phase angle, impedance angle and transient component amplitude, and determining AC component of short-circuit current and DC component at any moment based on short-circuit current analytical expression by using equivalent resistance, equivalent inductance, impedance angle and closing phase angle.

The embodiment of the invention provides a control method of voltage switch equipment, electronic equipment, a storage medium and a program product. The method comprises the following steps: acquiring standardized information of a target power grid through a sensor in the target power grid; inputting the standardized information into a voltage switch of a target power grid, and processing the standardized information through an electric energy metering module in voltage switch equipment to obtain power utilization data corresponding to the target power grid; and sending the power consumption data to a prepayment system corresponding to the target power grid to obtain a control instruction of the voltage switch fed back by the prepayment system based on the power consumption data. The method is used for achieving the effects of automatically executing switching-on and switching-off operation and realizing an unattended intelligent cost control management means.

The present invention relates to an electrical installation measurement system. An embodiment describes an electrical installation measurement system (100) comprising a control and measurement device (101) configured to be installed on a distribution board (104) of an electrical installation (103) and to perform at least one measurement of an electrical parameter of the electrical installation (103) in function of an electrical load connected to the electrical installation, and to send a command signal (SCM) along a telecommunication link. The system further comprises a variable load device (102) connectable to the electrical installation (103) and configured to: receive said command signal (SCM) from the telecommunication link; and to assume a plurality of load configurations in function of said command signal (SCM).

An integrated device provides a measure of a quantity dependent on current through an electrical conductor, having: a sensing and processing sub-system: an electrical conductor conducting current: an insulating material encapsulates the sensing and processing sub-system and maintains the electrical conductor in a fixed and spaced relationship to the sensing and processing sub-system. The insulating material insulates the electrical conductor from the sensing and processing sub-system. Sensing and processing sub-system sensing circuitry includes magnetic field sensing elements adjacent the electrical conductor. The sensing circuitry provides a measure of the quantity as a weighted sum and / or difference of magnetic field sensing elements outputs caused by current through the electrical conductor adjacent the magnetic field sensing elements. A voltage sensing input senses a measure of voltage associated with the current conductor. Sensing and processing sub-system output circuitry provides an output measure of the quantity from the sensed measure of current and voltage.

The application discloses a kind of modular energy storage system test platform and method, comprising: test console and at least one pair of supporting device;Supporting device includes: n intersection and module and n variable pressure module, n intersection and module and n variable pressure module are connected in one-to-one correspondence, first electric switch is connected between each intersection and corresponding variable pressure module, the connection of each intersection and corresponding first electric switch is connected with the second electric switch between adjacent next intersection and module;Wherein, intersection and module all include m parallel PCS units, and the second end between any adjacent two PCS units is all connected with third electric switch;Test console is used to control each electric switch and each PCS unit in at least one pair of supporting device coordinated action realizes the test of group string type energy storage system or centralized energy storage system.The application can be automatically configured into corresponding specification test tooling according to the specification characteristics of the energy storage system to be tested.

The invention relates to the field of concentrator debugging, and particularly discloses an intelligent debugging method and device for a power concentrator. The method comprises the following steps: building a dynamic composite test scene based on a rated working condition superposed with a plurality of disturbance factors, and dividing working condition fragments; a test signal is generated and input to a programmable power supply and a load simulator, and precision and power consumption test is started; obtaining a measurement error sequence of the concentrator for reading the basic electric parameters under each working condition segment, and evaluating the precision grade based on the sequence; meanwhile, a power consumption curve of the concentrator for executing typical tasks is obtained and compared with a standard power consumption base line, and whether energy consumption is abnormal or not is recognized according to the energy consumption characteristic deviation degree; and finally, judging whether the concentrator is qualified or not according to the precision grade and an energy consumption abnormity identification result, and marking unqualified working conditions and types. According to the invention, the measurement precision and the power consumption characteristic of the power concentrator under the complex working condition can be comprehensively and intelligently evaluated, and the authenticity, the accuracy and the efficiency of debugging are improved.

The invention discloses a 10kV integrated intelligent pole-mounted circuit breaker, and relates to the technical field of pole-mounted circuit breakers. The 10kV integrated intelligent pole-mounted circuit breaker comprises a circuit breaker body, a data acquisition module is arranged at the top of the circuit breaker body, a limiting assembly is arranged at the bottom of the circuit breaker body, a clamping assembly is arranged on one side of the limiting assembly, and the limiting assembly comprises a first isolation frame and a second isolation frame which are fixedly installed at the bottom of the circuit breaker body. Limiting plates are arranged at the bottoms of the first isolation frame and the second isolation frame. By arranging the limiting assembly, the circuit breaker can be clamped on the fixing component through the dead weight of the circuit breaker in the using process, and meanwhile, the fixing component of the telegraph pole can be connected with the limiting plate during clamping, so that loosening in the placing process is avoided, a threaded component does not need to be adopted for screwing and positioning operation, and the practicability of the telegraph pole is improved. Therefore, the subsequent installation and positioning operation of the circuit breaker is facilitated, and the use convenience of the circuit breaker is improved.

A photovoltaic inverter full efficiency evaluation method is disclosed, in the method, historical data of photovoltaic inverter operation is collected as analysis sample, efficiency / power model and efficiency / voltage model are constructed, discrete efficiency data is generated from the historical data, a rule model is constructed to clean and filter the efficiency data, to obtain discrete second efficiency data meeting the rules, a characteristic quantification model is constructed, to identify efficiency characteristics with continuity and uniqueness from the discrete second efficiency data, a photovoltaic inverter full efficiency index model representing photovoltaic inverter full efficiency is constructed based on the efficiency characteristics, and the photovoltaic inverter full efficiency is evaluated via the photovoltaic inverter full efficiency index model.

The invention relates to the technical field of micromotor load sensing, and discloses a micromotor load sensing method and system, a medium and electronic equipment. A micromotor load sensing method comprises the following steps: acquiring voltage and current accessed to a load in real time, and removing bias to obtain an actual voltage and current sampling value sequence curve; calculating a voltage effective value, a current effective value, active power and a power factor according to the voltage and current sampling value sequence curve, and drawing a corresponding change curve; according to the voltage effective value, the current effective value, the active power and the change of the power factor, identifying a transient starting characteristic and a transient starting characteristic respectively; and judging the type of the loaded micromotor according to an identification result, and placing a micromotor load label symbol. According to the invention, the identification efficiency and accuracy of the micromotor load are improved.

The invention discloses an automatic positioning motor inductance test device and method, and the device comprises a rack, and a mounting rack, a motor, a motor coil, a motor coil and a motor coil which are sequentially arranged in the X-axis direction, the driving unit is arranged on the mounting frame, and the output end is connected with a first coupler; the brake mechanism is arranged on the mounting frame and located on one side of the driving unit; one end of the transmission shaft is connected with the first coupler, and a shaft body is movably connected with the brake mechanism; the encoder is arranged on the shaft body of the transmission shaft; the mounting seat is arranged on the rack and used for mounting a tested motor, and a first support is further arranged on the mounting seat; one end of the test shaft is connected with the second coupler, a shaft body is connected with the tested motor, and the other end is movably connected with the first support through a bearing. Through the structure, accurate position control of the tested motor is realized, the influence of positioning errors on a measurement result is eliminated, meanwhile, compared with manual adjustment, the efficiency is improved, positioning can be rapidly completed, interference of human subjective factors is eliminated, the test precision is improved, and meanwhile, the repeatability of a test structure is good.

The invention belongs to the field of short-circuit current detection, and provides an AC / DC component calculation method and system for short-circuit current, and the method comprises the steps: determining three maximum values based on an oscillogram of the short-circuit current, fitting the relation among the amplitude of a voltage source, the line impedance and the amplitude of a transient component through the three maximum values, and calculating the amplitude of the transient component. Determining the ratio of the equivalent resistance to the equivalent inductance; the equivalent resistance and the equivalent inductance are determined according to the relation between the line impedance and the equivalent resistance and the equivalent inductance and the ratio of the equivalent resistance to the equivalent inductance; determining an impedance angle based on the relationship between the equivalent resistance and the equivalent inductance and the impedance angle; determining a phase angle according to the initial condition of the short-circuit current, and determining a closing phase angle according to the relation among the phase angle, the impedance angle and the transient component amplitude; and determining an alternating-current component of the short-circuit current and a direct-current component at any moment based on a short-circuit current analytic expression by using the equivalent resistance, the equivalent inductance, the impedance angle and the closing phase angle.