5. Recommended sequence of operations
Before carrying out any operation when voltage is
present, rst check the SF
6
gas pressure using the
manometer.
5.1. Gas pressure check
Each cubicle has a pressure gauge with temperature
compensation for checking the gas pressure, which can
easily be seen from outside the cubicle. The pressure gauge
scale is divided into dierent colours: red and green. For
safe operation, the needle must be in the green area of the
corresponding temperature band.
Main characteristics:
• Two normally open (NO) voltage-free contacts calibrated
at the same level.
• Accuracy class: + 20 °C - 1 %
- 30 °C to 60 °C - 2.5 %
• Temperature range: - 30 °C to + 60 °C
Figure 5.1. Pressure gauge with temperature compensation
IG-296-EN version 01; 12/03/2020
35
General instructions
cgmcosmos: Medium voltage cubicles with full insulation
in SF
6
gas up to 24 kV in accordance with IEC Standard
Recommended sequence of operations