The main task of the OTEM system is to detect partial discharges in transformers. In addition, the OTEM system provides valuable information about the condition of your transformer.

The OTEM sensor is attached to the light sensor. The OTEM sensor detects and processes the optical signals that are transmitted via the light sensor and transmits this data to an electronic unit, which evaluates, archives and processes the data. PD signals and the status of the system are clearly displayed using a graphical user interface. The electronic unit also offers various interfaces that support numerous protocols for integration into a control system.

In contrast to conventional PD monitoring systems, which detect the electrical signals of partial discharges, the OTEM system is based on the detection of optical partial discharge signals.

The advantages of optical partial discharge measurement are the high sensitivity and, in particular, the ability to precisely locate the partial discharge defect within the transformer. In addition, the OTEM system offers complete immunity to electromagnetic interference signals.