The centerpiece of our optical PD monitoring system in the field of transformers is the light sensor, which gives a direct insight into the transformer.

The task of the light sensor is to reliably detect the optical signals generated inside the transformer by partial discharges or arcs and to provide a connection for the evaluation electronics (OTEM). The light sensor is designed to reliably detect even the slightest optical signals, even without directly observing the fault.

We recommend the light sensor to be considered during the planning phase to avoid retrofitting while the transformer is in operation.

For already existing transformers, there is nonetheless the possibility of retrofitting light sensors during the course of a maintenance or a system overhaul.

If the light sensor is installed, the OTEM system can be retrofitted at any time (e.g. as an online monitoring system, for a temporary check for PD as well as during high-voltage).