35results about "Apparent power measurement" patented technology

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.

The invention relates to a power supply and consumption energy efficiency monitoring and fault liability recognition method and system for a green industrial park. The method includes that an electricenergy data acquisition terminal performs real-time data acquisition and storage on electric energy of each power consumer and each power grid electric energy supply point in the green industrial park; after data processing of the real-time data acquired by the data acquisition terminal, the data are uploaded to a power supply and consumption energy efficiency monitoring and fault liability recognition analysis platform through a communication network; the analysis platform subjects the uploaded electric energy data and other energy consumption data to data processing, data mining and data analysis according to application demands. The system comprises a data acquisition terminal, a data communication unit, a data server, a power supply and consumption energy efficiency monitoring and fault liability recognition analysis workstation and a man-machine interaction unit. On the basis of real-time data acquisition of a power supply and consumption system, online monitoring and analysis ofelectrical operating parameters, electric energy quality and energy efficiency, fault alarming, fault diagnosis and fault liability recognition are realized through big data mining.

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 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.