GE SF6, Инструкция по эксплуатации

Страница: 129 / 300

Installation
Calculation of the SF
6
gas filling pressure
for using the pressure gauge (tool)
GE Information
08- 2016 L31- 922EN/04
1/4
Presentation
Introduction
SF
6
pressure values, for the filling, must obligatorily be read on the pressure
gauge 0- 1 MPa (tooling). Pay no attention to indications given by the dial den-
simeter (MPa - psi), it is not accurate enough for the filling.
Pressure gauge 0...1 MPa
Pressure units
(reminder)
D
The international unit pressure is the Pascal (Pa).
1 bar (14.503 psi) = 1,000 hPa
1 bar = 100 kPa
10 bar = 1 MPa
Symbols
IEC symbols for the apparatus technical characteristics.
Symbol Designation
p
re
Filling rated pressure for the insulation
p
ae
Alarm pressure for the insulation
p
me
Minimal pressure for the insulation
In this module
This module contains the following topics :
Topic Page
Example of the filling pressure calculation 2
Calculation of the filling pressure at site 3
Values of the SF
6
gas pressures in accordance
with the temperature
4
Important The filling pressure may be incorrectly shown at low temperatures due to the
risk of partial liquefaction of the SF
6
gas. It is therefore not recommended that
filling or top- up operations be carried out at low temperatures (
L
) from the
tables entitled ”Effective, temperature- corrected SF
6
gas pressure values”.