The conceptual basis of the power transformer loading optimization tool is shown in fig. 1. This implementation consists of three interconnected modules which provide an intelligent transformer loading control.
Existing power transformers and primary feeders at Campinas Centro substation provide online data through Intelligent Electronic Devices (IEDs) as shown in fig. 1. These data feed the SCADA system with voltage and current values averaged at 1-minute intervals. The SCADA system initially stores this information in a built-in online database, and then passes it on to an external, historic database. Communication among all system components is provided by a local Ethernet network using the TCP/IP protocol. Although not part of the scope of this paper, it is worth mentioning that the third transformer installed in the substation has built-in optical sensors that allow a better evaluation of hot spot temperature.