The main task of the optoelectronic arc detection system (LiBo) is to locate arc faults in gas-insulated switchgear safely and accurately. In the event of an arc fault, only short interruptions to operation occur and the availability of the switchgear is increased.

For this purpose, light sensors monitor the individual gas compartments. If an arc occurs, the signal is transmitted via a fiber-optic cable to the electronic unit, which triggers a corresponding error message in the substation itself and in the SCADA system. As a result, affected gas compartments can be isolated immediately before significant damage can occur.

With the precise localization of the fault down to a single gas compartment, appropriate measures can be taken immediately to restore uninterrupted operation. Any consequential damage during the switching process can be prevented by knowing the exact location of the defective gas compartments.

Detecting partial discharges in gas insulated switchgear is the primary purpose of the optical partial discharge monitoring system (OTEM). As a result, considerable damage up to the worst-case scenario, the so-called "blackout", can be avoided. The optical partial discharge monitoring system also eliminates the need for time-consuming localization efforts by precisely identifying the affected gas compartment within the switchgear. As such, our optical systems can be a valuable addition to your existing monitoring systems.

The OTEM partial discharge monitoring system reliably monitors the condition of your GIS / GIL and enables you to take preventive action. This allows affected components to be replaced or repaired at an early stage without causing a failure or major damage (e.g. due to the development of an arc fault) to the system.

OTEM is particularly suitable if your GIS / GIL already is equipped with light sensors. In this case, the switchgear can be upgraded cost-effectively and efficiently. For systems without a dedicated light sensor, the system can be installed on standard glass windows (e.g. available on the disconnectors) . This makes the system suitable for new and existing installations, particularly in the high-voltage sector.

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.

The centerpiece of all our optical systems in the field of gas-insulated switchgear is the light sensor, which allows a direct view into the GIS / GIL. It can be taken into account cost-effectively in the planning phase and is compatible with both systems - arc detection and optical partial discharge monitoring.

With the light sensor installed, both the OTEM and LiBo systems can be cost-effectively retrofitted to your switchgear at a later stage. The ability to carry out mobile testing is ensured by the installed light sensor. This allows the optical systems to be connected to the light sensors at any time in the event of PD anomalies, cyclical maintenance, soak tests or high voltage tests.

For equipment that is not yet equipped with light sensors, it is possible to retrofit these in the course of a system overhaul. However, it is recommended to consider the light sensors already in the planning phase in order to avoid work on the GIS / GIL during operation.

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).