| Deep online analysis of dielectric parameters of insulation oils: Identification of critical operation conditions of high voltage transformers for reduction of failure rates Manfred Mauntz1; Jorn Peuser1; 1CMC INSTRUMENTS GMBH, Eschborn, Germany; PAPER: 487/Energy/Regular (Oral) SCHEDULED: 12:45/Mon. 28 Nov. 2022/Game ABSTRACT: The requirements for renewable energy for high voltage transformers and large industrial gearboxes as installed in wind turbines on-/offshore rise. Ever more flexibility at maximum operational reliability and a long lifetime is required of them at the same time, so the requirements for the oil and the oil condition monitoring grow correspondingly. This presentation provides information about a novel online oil condition monitoring system to give a solution to the mentioned priorities for both energy sectors. The focus is set to high voltage transformers but the possibilities in monitoring applications of lubrication oils in hybrid applications (electrical vehicles) are also addressed. The online oil sensor system measures the conductivity kappa, the relative permittivity epsilon r and the temperature T independently from each other. Based on a very sensitive measurement method with high accuracy, even small changes in the conductivity and dielectric constant of the oil composition can be detected reliably. The new sensor system effectively controls the proper operating conditions of high-voltage transformers, industrial gearboxes and in test rigs for electrical vehicles, where lubrication and isolation of the oil have a double function. The system enables damage prevention of the high voltage transformer by an advanced warning time of critical operation conditions and parameter trending realized by a precise measurement of the electrical conductivity, the relative permittivity, loss factor tan delta and oil temperature based on a high time resolution. Corrective procedures and/or maintenance can be carried out before actual damage occurs. Once the oil condition monitoring sensor systems are installed on the high voltage transformer or an oil regeneration plant, the measured data can be displayed and evaluated elsewhere in sense of a full online condition monitoring system. 24/7 monitoring of the system during operation enables specific preventive and condition-based maintenance independent of rigid inspection intervals. References: [1] P. Tchakoua, R. Wamkeue, M. Ouhrouche, F.S. Hasnaoui, T.A. Tameghe, G. Ekemb: Wind Turbine Condition Monitoring: State-of-the-Art Review, New Trends, and Future Challenges, Energies 2014,7, pp. 2595-2630, (2014). [2] M. Mauntz and U. Kuipers: Ölsensorsystem- Sensorsystem zur Messung von Komponenten der komplexen Impedanz elektrisch gering leitender und nichtleitender Fluide, dessen Realisierung und Anwendung, patent application no. 10 <span class="fon_main_wrapper"><span phone-source="2008 047 366" class="fon-phone-wrap fon-hightlighted active-call" id="fon-phone-UNoowb0V6l">2008 047 366</span><a phone-source="2008 047 366" href="#" class="fonCallLinkButton active-call"><img src="data:image/png;base64,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" alt="F"/></a></span>.9, German Patent Office, Munich, (2008). [3] M. Mauntz and U. Kuipers: Verfahren, Schaltungsanordnung, Sensor zur Messung physikalischer Größen in Fluiden sowie deren Verwendung, European patent application no. EP 09000244, European Patent Office, Munich, (2009). [4] M. Mauntz, J. Gegner and U. Kuipers: Ölsensorsystem zur Echtzeit-Zustandsüberwachung von technischen Anlagen und Maschinen, Technisches Messen 77, pp. 283-292, (2010). |
