Implementação e avaliação experimental de sensores para detecção de descargas parciais

Abstract

Partial discharges are an important indicator of the degradation of insulation systems in medium and high voltage electrical equipment, and are widely used for diagnosis and monitoring of the operational condition of these assets. In this context, this dissertation presents the implementation and experimental evaluation of sensors for the detection of partial discharges in insulated cables, developed from commercially accessible materials and additive manufacturing techniques. The objective of this study was to develop and experimentally characterize two electromagnetic sensor architectures, called Helical Antenna Sensor (HAS) and HFCT Relative Signature Sensor (HRSS), in addition to investigating the influence of physical, geometric and constructive parameters on the sensitivity of these devices. For this, design, manufacturing, experimental calibration and laboratory tests were carried out on insulated cables containing partial discharges. The performance of the prototypes was compared to that of a commercial HFCT sensor used as a reference. The results showed that both architectures were able to detect signals associated with partial discharges and reproduce patterns compatible with the investigated phenomena. It was found that changes in the construction parameters directly influence the sensitivity and response of the sensors.