Description and Functionalities
Monitoring of SF
6
gas
P20--0001EN/02
1/6
01--2011
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relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circumstances. It is
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GRID
Presentation
Introduction
The circuit breaker uses pressurised SF
6
gas like arc extinguisher gas.
It is therefore indispensible to monitor the SF
6
gas to guaranty the circuit
breaker performance.
Principl e
There are two ways to monitor SF
6
gas pressure:
D Permanent monitoring, using a contact densimeter.
D Periodic monitoring, using a dialled densimeter (visual verification).
Symbols
IEC symbols for the technical characteristics of the equipment.
Symbol Description
p
re
Assigned filling pressure for insulation
p
ae
Alarm pressure for insulation
p
me
Minimum insulation pressure
In this module
This module covers the following subjects:
Subject Page
Pressure and density 2
Calculation of pressure 3
Determination of density 4
Densimeter 5
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