Page 156 - Practical Power System and Protective Relays Commissioning

Gas Insulated System Substations Chapter | 14 155

equipment it should be left to stabilize for several hours to ensure the density
is correct.
The truck system consists of the following components:
Oil-free suction pump for recovery of SF 6 .
Vacuum pump for evacuation of air.
Operating indication of the most important process parameters in a screen
panel.
Evaporator.
Particle filter.
Dry filter.
Pressure and vacuum units.
Weighing scales for SF 6 bottles.
Long storage connecting hose.
Note: Before any gas handling is performed it is important to ensure that
the equipment has been properly isolated from energized electrical sources.