With positive sequence process,solved the problem of product's freezing point picking up,made the process of benzene-acetone dewaxing more easier at the sametime,reduced the energy consumption and improved tr.

Duffing oscillator directional relay which based on positive sequence fault components of transmission lines is proposed.

Based on mathematical deduction and analysis, the problems are pointed out that concern the detection of harmonics and fundamental positive-sequence active & reactive current components with instantaneous reactive power theory under asymmetrical three-phase voltages.

By using academic analysis and simulational validation,it points out that comparing with the selectors using interlinked tension of irrespective phase as polarizing voltage,the selector using positive voltage as polarizing voltage has some more virtues.

Design of integrated circuit positive sequence component and negative sequence component filter;

A new method for detecting the fundamental negative and positive sequence components as well as the harmonic components is developed in this paper.