• A Eberle GmbH & Co KG

TMM Transformer – Monitor

Power transformers are key components for power supply systems. The breakdown of a transformer not only brings a lot of economical disadvantages for the energy supplier, but also results in extreme losses for the consumer. For this reason, close monitoring of the transformer is recommended as well as a recording of its “temperature curve” (thermal image) to gain information on the present load and the remaining lifetime. This task can be solved - based on IEC standards - by using electronic measuring and calculation equipment. The operating manual describes how the software and hardware of a REG-D can be upgraded to enable TMM functionality in addition to performing its role as a voltage regulator. Also the steps required to set up the transformer monitoring functions are detailed. The temperature of the oil is an important measurement quantity for the determination of the hotspot temperature of the winding as is the value of the current passing through the winding. The oil temperature can be supplied to the regulator either as a mA signal or directly as a PT100 signal. Appropriate input modules are available for both types of signal. If the oil level and other quantities such as the humidity, H2 or CO content of the oil are to be measured, the appropriate analogue input channels must be available. These channels can be added later to the REG-D.