GIS intelligent local control panel in compact substations

In order to further save the land and improve the substation automation, a DSAS scheme based on intelligent GIS LCP (Local Control Panel) is proposed. A GIS intelligent device is developed, which integrates traditional GIS LCP functions and the bay electrical monitoring and control functions. The GIS intelligent device samples and processes the bay current and voltage signal, and sends them to the station level system via Ethernet. The device achieves inner-bay interlocking, phase discrepancy trip and synchronism checking by software. The device can monitor GIS status including position and SF6 density, and forecast the remaining life of GIS. The GIS intelligent device, together with the bay protection devices are installed on the same panel-GIS intelligent LCP, next to the GIS. The GIS Intelligent LCP connects to GIS via standardized plugs and sockets, and communicates with the station level system in control room via optic-fibre cables. Compared with the traditional scheme, this scheme saves the land, reduces the cables, simplifies the secondary circuits and improves their reliability. It will be widely applied to compact substation in large cities and hydropower plants.