Alstom GL314 - SF 6 Gas Monitoring

Description and operation
SF
6
gas monitoring
L20--001EN/04
1/6
01--2003
E ALSTOM
Presentatio n
Introduction
The circuit--breaker uses pressurized SF
6
gas as electric arc quenching gas.
The SF
6
gas pressure monitoring is essential to assure the circuit--breaker
performances.
Principl e
There is two SF
6
gas pressure monitoring types :
D Permanent monitoring with the help of a threshold densimeter.
D Periodic monitoring with the help of a dial densimeter (visual control)
Symbols
IEC symbols for the apparatus technical characteristics.
Symbol Designation
p
re
Filling rated pressure for the insulation
p
ae
Alarm pressure for the insulation
p
me
Minimal pressure for the insulation
In this module
This module contains the following topics :
Topic Page
Gas pressure and density 2
Pressure measurement 3
Measuring density 4
Densimeter 5