Analytical Method to Diagnose Large Salient Poles Through Frequency Response Analysis

This paper aims to present a mathematical approach to diagnosis large salient poles through Frequency Response Analysis (FRA). FRA is a tool which provides an accurate state of the machine throughout a Bode diagram. Interpreting FRA test is not a simple task. However, this type of test shows how a system changes from the healthy conditions. The FRA test response in healthy conditions is a unique solution and it is considered as reference test. This paper presents a method to assess the FRA tests based on an equivalent RLC circuit. The parameters of the equivalent circuit indicate if the machine is in healthy or faulty state. The proposed method has been testing in a pole of a 40 MVA synchronous generator.