Omicron CIBANO 500 PTM - Page 216

CIBANO 500 PTM User Manual
216 OMICRON
The more grounding switches and disconnectors are incorporated, the safer is the maintenance work on
the circuit breaker.
Figure 17-34: Single-line diagram of a GIS with a minimum set of grounding switches and disconnectors
– unsafe to open grounding switches during circuit breaker maintenance
Busbar 1
Busbar 2
Disconnector
open
Grounding switch
closed
Circuit breaker
Disconnector
open
Grounding switch
closed