2026-09-09T08:19:21Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/75402024-05-14T09:45:32Zcom_10259_6155com_10259_4266com_10259.4_106com_10259_2604col_10259_6156

00925njm 22002777a 4500 dc Martínez, Raquel author Arroyo, Alberto author Pigazo, Alberto author Manana, Mario author Bayona Blanco, Eduardo author Azcondo, Francisco J. author Bustamante, Sergio author Laso, Alberto author 2022-12 Power-quality events and operation transients in power systems (PS) with isolated neutral can saturate inductive voltage transformers (IVT), which, when interacting with the overhead and underground cable capacitances, can cause ferroresonance events in the local PS. This abnormal operating mode can partially or totally damage the transformers and switchgears within the affected PS. Distribution system operators (DSO) can minimize these effects by detecting ferroresonance events accurately and fast enough and changing the mode of operation accordingly. Direct detection methods, i.e., based on voltage measurements, are reliable, but the massive deployment of this solution is relatively expensive; i.e., power quality analyzers cost thousands of USD. Alternatively, indirect detection methods are also available, e.g., IVT vibration measurements with accelerometers costing hundreds of USD, but their reliability depends on the installation method used. This manuscript proposes using the acoustic noise caused by magnetostriction forces within the IVT core during ferroresonance events to detect their occurrence. Compared to other indirect methods, electret condenser microphones with preamplifying stage cost less than USD 10 and are less sensitive to the installation procedure. The proposed method is validated experimentally, and its performance compared to IVT vibration measurements one by using the same detection methodology. http://hdl.handle.net/10259/7540 10.3390/s23010195 1424-8220 Ferroresonance detection Inductive voltage transformer Potential transformer Acoustic Noise-Based Detection of Ferroresonance Events in Isolated Neutral Power Systems with Inductive Voltage Transformers