673 / 2022-03-31 13:35:08

Portable Device Based on Micro-sensor Array for the Detection of Air Discharge

Air Discharge,gas sensor,fault diagnosis,NO2 detection

Purpose/Aim

The malfunction of air-insulated power equipment can produce a series of gas decomposition products, represented by NO₂ and CO. However, the severe cross-sensitivity of sensing materials towards these two gases is a puzzle that restricts the development of fault diagnosis.

Experimental/Modeling methods

This work has fabricated a micro-sensor array with four gas-sensing materials (10 wt% WO₃, 5 wt% NiO, 10 wt% TiO₂, 5 wt% SnO₂ doped with In₂O₃), and a portable gas detection device has also been implemented towards NO₂ and CO, which was flexible for several detection scenarios (direct connection, calibration and sampling mode).

Results/discussion

We have acquired the response curves of the portable device towards 50 ppm NO₂ (2115.73%) than 50 ppm CO (-8.12%). First, the principal component analysis (PCA) has verified the classification ability of NO₂ and CO mixtures. Then, three machine learning algorithms (SVM, RF and KNN) were utilized to improve the selectivity towards NO₂, and their identification accuracy were 99.23%, 99.61%, 99.24%, respectively. Ultimately, the portable device with NVIDA Jetson nano demonstrated the great potential in the rapid diagnosis of air-discharge fault.

Conclusions

This work proposed a portable detection system for air discharge gas decomposition with high selectivity, which allowed acquiring the concentration of NO₂ accurately under CO interference.