What is SFRA Test? Frequency response analysis (often referred to as FRA or SFRA ) is a powerful and sensitive method for testing the mechanical integrity of transformer cores, windings, and press frames, in power transformers. The winding of transformer may be subjected to mechanical stresses during transportation, heavy short circuit faults, transient switching impulses and lightening impulses etc. These mechanical stresses may cause displacement of transformer windings from their position and may also cause deformation of these windings. SFRA Test can detect, winding deformation – axial & radial, like hoop buckling, tilting, spiraling displacements between high and low voltage windings partial winding collapse shorted or open turns faulty grounding of core or screens core movement broken clamping structures problematic internal connections How SFRA works? Transformers consist of multiple complex networks of capacitances and resistors that can generate a unique
To evaluate any asset or system with the RCM(Reliability Centered Maintenance) process Following seven questions are to be asked, What are the functions and associate performance standards of the system in present operating condition? How the system is failed to fulfill its functions? What are the causes for the failure of its functions.? What happen when its function failure occurred? In what way each failure matter or failure significance or consequences? What can be done to prevent or predict the failure? What happen if any proper proactive task cannot be found to prevent or predict the failure? Any team ask this basic Seven question to the system or the asset to be evaluated via RCM process for determination the maintenance requirement to be done easily. #RCM #realibility