GE SF6, Instruction Manual

Page: 37 / 300

Description and operation
SF
6
gas monitoring
GE Information
07- 2016 L20- 001EN/08
5/6
Densimeter
Function
D
Permanent SF
6
gas density monitoring.
D
Visual SF
6
gas real pressure information (MPa - psi).
Localization
The densimeter is situated onto the bottom of the pole of the circuit- breaker,
and joined to the gas volume of the circuit- breaker.
Working
The densimeter is fitted with internal contacts. These contacts close success-
ively if the gas’s density diminishes and determine 2 distinct thresholds.
These contacts are wired to the terminal block inside the cubicle and are usu-
ally left at the user’s disposal for the following use :
D
Alarm pressure ” p
ae
” acts as a warning (topping up necessary).
D
Minimum functional pressure for insulation ” p
me
” must be used either to
lock the circuit- breaker in position or to cause automatic opening. The option
is chosen by the client in keeping with operating requirements.
All the circuit- breaker’s rated performances are guaranteed up to the min-
imum specified ambient temperature and the minimum functional pressure
for insulation ” p
me
”.
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