Maintenance
Electrical contact densimeter threshold in sp ectio n
L51--107EN/01
6/8
06--2003
E ALSTOM
Densimeter threshold inspection, continued
Testing
The table below gives the steps of densimeter testing :
Step Action Comment/Diagram
1 Connect a test lamp to the
“Alarm pressure for t he insula-
tion” p
ae
densimeter threshold.
Connection to the terminal block of
the operating mechanism in accor-
dance with the electrical diagram.
2 Calculate the effective pres-
sure at which the “Alarm pres-
sure for the insulation” p
ae
con-
tact switches over -- corrected
in keeping with temperature
and local atmospheric pres-
sure.
Value p
ae
: see technical character-
istics).
See the module “Calculation of
the SF
6
gas filling pressure to
using the pressure gauge (tool)”.
3 D Create a leak by screwing
the “REGULATION” knurl knob
(20) of the threshold inspection
assembly (4), making sure that
the contact switches over at
the previously calculated val-
ue.
D Proceed in the same way to
check the contact of “Minimal
pressure for the insulation”
p
me
.
CLOSEOPEN
(leak)
20
4
20
If one of the thresholds does not
comply with the specified value, re-
place the densimeter.
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