A virtual value method of locating single-phase grounding fault section of 10kV feeders in power distribution system;

This paper proposes a new detection method of voltage sag combining wavelet packet transform and rms algorithm on the basis of deep and careful study of.

Based on the basic concept,characterization and cause of voltage sags,a method of detecting voltage sags characterization through RMS algorithm,including data acquisition,data processing and output,is introduced.

The effective calorific value,composition and thermal stability of the smelting coal are all important for the COREX process,because they can influence the smelting process by influencing the coal consumption,the utilization rate of reduction gas,and the height of the fixed b.

Coal consumption of COREX is too much and coke is still used to supply effective calorific value of coal and form a fix bed with carbon.

At the same time,based on the study of anaerobic fermentation with several different biomass materials,the heating value,the theoretical biogas conversion rate and the actual biogas conversion rate were analyzed,and the effective calorific values between direct combustion and biogas making were compared.

A new measurement for alternating-current virtual value is presented.

According to the principles of numeration table, the author puts forward simple but practical methods of how to measure the mean values, virtual values and peak values of non sine waves.

The AC voltage meter and the AC current meter used in power system are usually rectifying instruments, which adopt principle of responding to the average value of voltage and current and get the virtual value by using of the proportion between the average value and it.