35results about "Apparent power measurement" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.