MONITORING AND CONTROLLING OF POWER LOSS IN A TRANSFORMER
Keywords:
Power Transformer, Thermal monitoring, Hot-spot temperature, Paper/Oil-insulation ageing, Overload capability, Fuzzy controlled fan operation, Field bus technologyAbstract
Large power transformers belong to the most valuable and important assets in electrical power systems. The
ageing of the used oil/paper-insulation primarily depends on the hot-spot temperature of the solid insulation system. Hence it
is the dominant factor limiting the lifetime of the transformer. Therefore a prototype of a stand alone thermal monitoring
system was developed and installed on a 350 MVA transformer to observe the hot-spot temperature. The experiences of
successfully operation during the last years encouraged us to update the system to the newest stage. The paper describes the
state-of-the-art of the thermal transformer monitoring system based on new field bus technology The advantages of a
networked system and the usage of a centrally managed data base shared between multiple monitoring systems are exposed.
The intention to implement new features exceeding the conventional monitoring system philosophy is discussed on an
intelligent multifunction criteria Fuzzy algorithm for the control of fans of the heat exchanger units. It permits a more costeffective long-time transformer operation management
