Description and Functionalities
Monitoring of SF
6
gas
P20--0001EN/02
5/6
01--2011
© ALSTOM 2010. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be
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
provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is
strictly prohibited.
GRID
Densimeter
Functions
D Premanent monitoring of the SF
6
gas density.
D Visual indication of the real SF
6
gas pressure (MPa -- psi).
Localisation
The densimeter is located at the base of the circuit breaker pole, and is
connected to the gas volume of the circuit breaker.
Internal contact
The densimeter is equipped with internal contacts. These contacts close in
succession in the event of decrease in gas density, and determine 2
distinct thresholds. The contacts are cabled to the electrical cabinet
terminals and are generally left available to the operator for the following
use:
D Alarm pressure ”p
ae
” acts as a warning (additional filling may be
required).
D Minimum pressure for insulation ”p
me
” must serve either to lock the
circuit breaker in position or to cause automatic opening. the client
chooses according to operating needs.
All performance assigned to the circuit breaker is guaranteed to the
specified minimum ambient temperature for insulation, ”p
me
”.
Continued on next page.
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