| Parameter | Benefit | |-----------|---------| | | 60–80% less than conventional air-insulated switchgear (AIS). | | Maintenance | Sealed for life – no gas handling, no contact cleaning. | | Installation | Pre-assembled, factory-tested, pluggable cable connectors. | | Ambient conditions | Unaffected by dust, humidity, salt spray, small animals. | | Retrofitting | Compatible with existing 8DNx series (e.g., 8DN8 – SF₆ version). |
Report prepared: April 2026. Specifications based on Siemens Energy publicly available data for the 8DN9 Blue GIS series. siemens 8dn9
08:00 – Normal load: 750 A per feeder. Gas pressure: 6.5 bar abs. 10:30 – Fault on outgoing feeder – short circuit 25 kA. 10:30.050 – Breaker trips (signal to relay → trip coil → main contact opens in 30–40 ms). 10:30.200 – Fault cleared. Breaker open. 12:00 – Operator closes remote again after line repaired. 15:00 – Daily gas pressure log: all green. | Parameter | Benefit | |-----------|---------| | |