GE GL317D, Instruction Manual

Page: 148 / 296

Commissioning
Pre- commissioning inspections
GE Information
L34- 011EN/09
4/6
10- 2016
SF
6
or SF
6
+CF
4
gas
Reminder SF
6
or SF
6
+CF
4
envelopes are at rated pressure following the SF
6
or
SF
6
+CF
4
gas filling operation.
NOTE : You are reminded that the gas used to fill the pole must
conform to the requirements laid out in IEC 60376.
Parameters
Take note of parameters below :
S
site altitude, in meters,
S
atmospheric pressure of site in kPa,
S
site temperature in

C.
Checking SF
6
or
SF
6
+CF
4
gas
SF
6
or SF
6
+CF
4
pressure values must obligatorily be read on the pressure
inspection gauge (tooling). Pay no attention to indications given by the dial
densimeter on the filling control block (where applicable) ; it is not accurate
enough for this inspection.
See the module “ Calculation of the SF
6
or SF
6
+CF
4
gas filling pressure
to using the pressure gauge (tool) ”.
The table below gives the steps of checking :
Step Action Comment
1 Measure SF
6
or SF
6
+CF
4
gas
pressure by means of the pres-
sure inspection gauge (tooling)
Follow the instructions given in
module ”Filling with SF
6
or
SF
6
+CF
4
gas”.
2 Correct pressure found. Follow the instructions given in
module ”Calculation of the SF
6
or SF
6
+CF
4
gas filling pres-
sure to using the pressure
gauge (tool)”.
SF
6
or SF
6
+CF
4
gas
humidity level
The SF
6
or SF
6
+CF
4
humidity level need not be known as the equipment is
fitted with molecular sieves in sufficient numbers to give a dew point lower
than, or equal to, 0

C at an ambient temperature of 20

C, for an apparatus
filled to its rated pressure for 2 or 3 months.
Checking tightness
of assemblages
under SF
6
or SF
6
+CF
4
pressure
Each on site assemblage of parts subjected to SF
6
or SF
6
+CF
4
gas requires
seals. The quality of these assemblages must be checked.
This inspection should be undertaken once all the filling and pressure control
operations are finished.
Execute this checking according to instructions given in module ”SF
6
or
SF
6
+CF
4
gas monitoring”.