70
4 Installation
4.7
Filling the Circuit-Breaker with Gas
4.7.1 Evacuating
WARNING
Evacuate the circuit-breaker not later than one hour after removing the transport cover from the
double interrupter head.
If serving equipment is not available, you must have a vacuum pump to evacuate the poles before filling with SF
6
gas.
Connect the service unit at the filling connection W1 (Fig. 1). Evacuate the circuit-breaker down to a pressure of <
0.02 bar; then switch the service unit for "fill". The required filling pressure and response values are temperature-
dependent and must be taken from the diagram,
SF
6
filling curve and response values of the density monitor,
see
3.1.6
Arc Quenching Medium SF
6
.
4.7.2 Filling the Breaker from the Gas Cylinder
Siemens offers a complete filling device of type W423 for filling the circuit-breaker with SF
6
gas from a gas
cylinder (Fig. 53).
Attention
The circuit-breaker may be filled only by or under the supervision of qualified personnel, and in
accordance with the SF
6
filling curve (see under 3.1.6 Arc Quenching Medium SF
6
).
Attention
For filling the breaker with gas only use as good as new SF
6
-gas which corresponds the
demands ace. IEC 60376.
