Magnetic Fluxgate Based Insulation Testing Solution for DC Systems

Abstract

Traditional insulation detection schemes are based on Hall sensors, which have large zero drift and temperature drift, are difficult to maintain accuracy in outdoor new energy scenarios. This paper designs a DC system insulation detection scheme based on the fluxgate. The fluxgate sensing module is developed using a single magnetic ring and single-coil structure, which suppresses the zero drift; an offset coil input is introduced to build a closed-loop detection system to solve the temperature drift. The solution has been proven to achieve low zero drift and high accuracy over the full temperature range.