S&C Trans-Rupter II SE Installation Manual page 41

OK to operate (but replace):
This is the yellow zone. If the gauge needle is
in this zone, the pole-unit can be opened and
closed with full ratings. However, the pole-unit
has lost gas and should be replaced as soon as
possible. See Figure 82.
Ç
WARNING
DO NOT open Trans-Rupter II unless the gas-
pressure gauge is in the "OK" to operate zone .
Opening Trans-Rupter II with one or
more pole-units in the "Do not operate"
zone can damage the transformer.
REPLACE:
There are two red zones. If the indicator needle
is in the red zone shown in Figure 83, the gas
density in the pole-unit has dropped below the
minimum functional level and the pole-unit
will not maintain full interrupting or dielectric
ratings. The pole-unit should be removed from
service and replaced promptly. Do not operate
this Trans-Rupter II.
If the indicator needle is in the red zone
shown in Figure 84, the local gas-density
gauge is damaged, and cannot be relied on to
provide an accurate indication of gas density.
The pole-unit should be removed from service
and replaced promptly. Contact your local S&C
Sales Office. Do not operate the Trans-Rupter II.
NOTICE
At temperatures below -31°F (-35°C), a Level
2 alarm may be issued due to the cold temper-
ature . The gas density is below the minimum
functional level, so the pole-unit will not have
full interrupting or dielectric ratings . At these
temperatures, a Level 2 Alarm does not
accurately indicate whether a pole-unit is
losing SF .
6
Figure 82. Gauge needle in yellow "OK" to operate (but replace) zone.
"REPLACE" zone
Figure 83. Gauge needle in red "REPLACE" zone.
Figure 84. Gauge needle in red "REPLACE" zone.
Indicators
"OK" to operate
(but replace) zone
"REPLACE"
zone
S&C Instruction Sheet 731-502
41