J4 ›› 2011, Vol. 10 ›› Issue (4): 35-37.
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With the limit requirements of harmonic and negative seq~3ence CuiTent of national and electricity se~or，as wdl as the security and quality of the ph0sph0rus—based internal power supply system，the monitoring and protection system was designed to detect power harmonic and negative sequence current produced in process of phosphorus furnace operation using harmonic filtering to match the overall drop in power factor compensation．The data of harmonic and negative sequence current was collected and anal7zed by the
data acquisition station，and results of the analysis were transmitted through the network to the head monitor and operation station of overall drop．By the data，the monitoring and protection system can monitor power harmonic and negative sequence current and protect power supply system．
