(OADS) arc online monitoring system to achieve GIS, metal enclosed switchgearequipment, AC / DC high voltage circuit breaker internal arc fault detection andlocation etc.. Details of the system can display real-time GIS arc fault in the monitoring and control unit on the local, and through the floating contacts andserial interface the remote transmission of information to the control center. Not only suitable for a new substation, substation is also suitable for the modification or expansion of. Arc monitoring system can be widely applied to 35kV - 1200kV fromAC, DC voltage rating of SF6 gas combined electrical equipment. GIS equipment installed in substations arc monitoring system, although there are a large number of electromagnetic wave and clutter, mechanical wave interference signals intransformer substation inside, but due to the use of OADS in the system is a passive element (LA optical sensor and optical connection), have natural immunity to these interference.

The system has the following two advantages:

1, when the load switch and circuit breaker, the generated transient over voltagewithout any influence on the arc monitoring system.

Arc detection device 2, GIS equipment and local maintain good electrical isolation,avoid arc detection device is interference.

The system mainly consists of three parts:

1, LA type arc sensor:

2, VE optical signal connecting cable (Fibre-optic link)

3, LIBO arc detection device (electronic unit and signal processing)