A Novel IEPE AE-Vibration-Temperature-Combined Intelligent Sensor for Defect Detection of Power Equipment

Insulation and mechanical defects are the main reasons for the power equipment fault, the former could generate partial discharge (PD), which can be detected by the acoustic emission (AE) sensor, and the other one can be evaluated by vibration and temperature variation. However, the two defects are detected and analyzed independently in traditional detection, and the importance of multisignal interaction and fusion analysis is ignored. To realize multisignal synchronous detection and associated analysis, and improve the accuracy and efficiency of the state evaluation of power equipment, a novel integrated electronics piezoelectric (IEPE) AE-vibration-temperature-combined intelligent sensor is proposed and developed in this article. Reasonable structure design and component customization enable the sensor to acquire signals simultaneously. Meanwhile, an integrated transducer electronic data sheet (TEDS) and data processing circuit intelligentize the combined sensor. The primary detection parameters of the sensor are acquired in the calibration experiments. In PD, and the vibration and temperature joint experiment, it is verified that the combined sensor is more sensitive and multifunctional. Besides, a new fusion analysis diagram, vibration-phase resolved PD (V-PRPD), is proposed to characterize the correlation between PD and vibration.