A New Current Transducer for On-Line Monitoring of Leakage Current on HV Insulator Strings

This paper presents the design, implementation and testing of a transducer to measure monitor in real time leakage currents on high-voltage insulators. The new proposed has particularity not affecting insulation capacity insulator strings can be installed without need de-energize power system. is made up toroidal current transformer with high permeability magnetic core, an amplifier circuit, output voltage which acquired, processed transmitted by dedicated device lower part HV tower. reconstructed from applying FFT technique its own inverse transfer function. makes it possible obtain characteristic harmonics presented here reduces electromagnetic noise present systems. was tested inside artificial fog chamber, built according IEC 60507 standard. Finally, string 220 kV substation. results obtained show that designed correctly measures used for on-line monitoring pollution levels strings.