Abstract

A semiconductor sensor with a gas sensitive layer based on SnO₂ and Sb₂O₅ with Pd additive synthesized by co-precipitation was studied as a chromatographic detector. It was found that the subject detector, using air as a carrier gas, can selectively detect each of the reducing gases (H₂, CO, CH₄, C₂H₂, C₂H₄, C₂H₆) which can leak into transformer oil if defects emerge during high-voltage transformers operation. It was established that for the fabricated detector the dependences of the signals on concentrations of the analyzed gases are linear in the range of 0–50 ppm for H₂, CO, CH₄ and 0–100 ppm for C₂H₂, C₂H₄, C₂H₆. The detector can be on-stream as combined with a chromatograph instrumentality which is rational for a wide practical application. The usage of the semiconductor detector based on the adsorption-semiconductor sensor is promising to significantly reduce the detection cost of the gases and to simplify diagnostics of the high-voltage transformer conditions.

Keywords: semiconductor detector, sensor, reducing gases, transformer oil, chromatography

Article language: Ukr.