This paper presents a new data compression method for current loop transmitters. In this method, the 4-20 mA current domain is divided into some equal pieces that are used for distinct data domain with a constant relative resolution, resulting in widening the signal span. This technique eliminated the need for high resolution ADC’s or DAC’s in communication of 4-20mA current loop signals. Furth...

In the field of high-voltage transmission and distribution, secondary equipments are influenced by electromagnetic coupling effect generated primary circuit, which causes strong interference to signal cable. this paper, an equivalent circuit model is established for cables in different forms, namely conventional cable, coaxial cable twisted pair based on line theory. Based model, responses thes...