Sažetak
On-line flux monitoring via permanently installed air gap flux probes is a proven technology, which has been used for many years in synchronous machines, to determine the presence of turnto- turn shorts in a rotor winding. This information is critical for planning maintenance and for vibration analysis. Traditionally, flux measurements have been performed using flux probes installed on a stator wedge connected to portable or permanently installed instruments. Traditionally, to achieve a reliable diagnostic, the signals from the flux probe has to be measured under different load conditions ranging from no load to full load. This requirement presents a serious obstacle when applying this method on base load units. Recently, a new design of flux probe installed on a stator tooth was implemented. Novel algorithms used to analyze measurements using either type of flux probe can help minimize the need for tests at different load conditions and still provide reliable diagnostics. Finite Element Models (FEM) have been created to verify these new algorithms in different loading conditions. This paper describes the new method and its advantages, comparing results obtained from on-line measurements on working generators and the Finite Element Model created to simulate different rotor conditions.
Ključne riječi
turbogenerator magnetic field diagnostic inter-coil shor circuit Finite elements method
