Laboratory Setup for Developing Inteligent System in the Electrical-Equipment-Related Infra Red Inspection
Abstract
Infrared thermography IRT itself is theoretically well understood in terms of quantum physics and hence widely used as practical non-invasive diagnostic tool. Obtained thermographs are digitalized and stored, supporting detailed statistical analyses and, if required, distance measurements. This paper reports development of the setup for image processing optimization using infrared camera. Our goal is to report the design and commissioning of the setup enabling reproducible conditions for testing the camera readings. Aiming towards researching advanced algorithms for the power system malfunction diagnostics, we presented precise laboratory setup for simulation of actual currents in power busbars and contactors. Equipment malfunctions are dominantly related to increase of the resistance and, consequently, heating due to current flowing. We have analyzed the busbar junction flowed by the permanent current. For laboratory analysis it is highly desirable to design system capable of generating and measuring test currents high enough to provoke hot spot visibility (up to 2 kA). Since busbars are connected via bolt and nut, knowledge of applied momentum is necessary in order to simulate changes in the contact resistance and consequently heat dissipation. In case sufficient moment is omitted, the junction will develop higher temperature no matter which type of busbar is used. The expected temperature can be well predicted, fine-tuned and compared to obtained IR camera readout.
Goran Petrović
Full Professor | Department of Electrical Measurements
Prof. dr. sc. Goran Petrović is a full professor at the Faculty of Electrical Engineering, Mechanical Engineering and Architecture in Split. His research interests include measurement of electrical and process quantities, analysis of geoelectrical and geothermal features of the soil, instrumentation for smart grids, measurement and application of synchrophasors. He is the author of numerous papers published in top-tier scientific journals and contributed to valuable international and national scientific projects.
