Electronic Temperature Monitors (ETMs) can replace up to three analog gauges and consolidate temperature data and cooling control into a single point of communication. ETMs provide better measurement accuracy than traditional gauges by using transformer design information to calculate winding hot spot temperature both during load fluctuations and steady conditions. ETMs can connect to multiple bushing CTs so all three phases are monitored with one device to identify which one is truly the hottest. ETMs are able to calculate the insulation loss of life which helps utilities manage the estimated life of the transformer.
ETMs have electronic communication which provides the data to utilities remotely. It keeps detailed records of data so you are able to download history at any time. ETMs come in robust fail-safe designs to provide additional reliability beyond what a gauge can offer.