Methodology for Calibrating and Operational Check of a Sweep Frequency Response Analyzer

Abstract

Power transformers are essential components for the generation, transmission and distribution of energy, and their maintenance or replacement due to a malfunction is highly complex and costly. Therefore, periodic tests on these components are effective in detecting possible failures in advance, allowing adequate time to mitigate the problem. The method usually adopted for testing transformers is by means of the Sweep Frequency Response Analyzer, as it has many advantages, such as allowing the test to be non-destructive. However, the metrological reliability must be guaranteed, so that the actions taken resulting from the analysis of its results are as correct as possible, without influence due to the lack of accuracy of the equipment. For this, a methodology is proposed which involves the calibration and operational checks of these equipment. The adopted method was applied in two instruments of different brands and the results were analyzed.