Modern techniques let utilities continuously monitor the stresses on transformers and analyze their effects. As an example, the capacity of a transformer typically depends on the operation of ancillary pumps or fans. Malfunction of this ancillary equipment can significantly derate the transformer by overloading it and damaging the insulation. Therefore, by confirming the operation of ancillary equipment, an asset manager can avoid reduction in service life as a result of overloading. Through the continuous acquisition of condition information, it is possible to defer replacement of an aging transformer without risking catastrophic failure.
Critical parameters are determined for each transformer and the appropriate sensors are installed.
The central processing unit continuously interrogates and monitors the sensor outputs. GE-Harley's Sage software package works with the hardware, monitors trends, and provides diagnostic assistance. Intelligent systems help Interpretation of data is of fundamental importance in achieving the full advantages of modern condition monitoring. The current economic climate within the electricity industry demands efficiency, and hence it is crucial that the monitoring systems themselves be self-sufficient, requiring minimal user involvement. This has been achieved at ElectraNet SA through the development of intelligent software systems that identify failure conditions with software algorithms.