Moisture monitoring technology for GIS using dual-cone microfibers

Abstract

An increase in moisture content within GIS （gas insulated switchgear） can compromise its insulation integrity. To monitor insulation gas humidity inside GIS， a humidity sensor using dual-cone microfibers is developed. Firstly， utilizing beam propagation method （BPM）， the optical field of the dual-cone microfibers is simulated to investigate their field distribution and mode interference theory. This analysis reveals the correlation between SF6 and moisture content. Subsequently， the fused biconical taper （FBT） is used to fabricate the dual-cone microfiber humidity sensor and conduct humidity sensing experiments. Based on the experimental data， it is determined that the humidity sensor using dual-cone microfibers exhibits a detection sensitivity of -51.75 pm/%RH， enabling continuous online monitoring of humidity levels in electrical equipment.

Keywords

• gis
• microfiber
• humidity
• sensor