Sensor assembly and method for determining the hydrogen and moisture content of transformer oil

摘要

A sensor assembly 10 for sensing a hydrogen and moisture content of insulation liquid 2 of a liquid-filled electrical equipment based on radiation detection is provided. The sensor assembly comprises at least one electromagnetic radiation source 60 for emitting electromagnetic radiation; a water detection section 20 arranged for receiving at least a water-containing component 2a of the insulation liquid when the sensor assembly is in operational connection with the electrical equipment and for being illuminated by electromagnetic radiation from the at least one electromagnetic radiation source 60; a first electromagnetic radiation detector 30 configured for detecting electromagnetic radiation coming from the water detection section 20 at a wavelength indicative of an amount of water present at the water detection section; a hydrogen detection section 40 arranged for receiving at least a hydrogen-containing component 2b of the insulation liquid when the sensor assembly is in operational connection with the electrical equipment and for being illuminated by electromagnetic radiation from the at least one electromagnetic radiation source 60; and a second electromagnetic radiation detector 50 configured for detecting electromagnetic radiation coming from the hydrogen detection section 40 at a wavelength indicative of an amount of hydrogen present at the hydrogen detection section.