INSPECTION AND MAINTENANCE
REV6 /REV3 OI 248 (EN) 71
9.3.4 Checking the Gas Quality
Take a gas sample and check for compliance with the limits.
- Dew point: ≤ -5°C
1)
-SF
6
conten
t
: ≥ 97%
- Acidity (SO
2
): < 180 ppmv
2)
1) Based on the operating pressure and 20°C.
2) Measurements earliest perform three days after a short circuit.
The required measuring and testing equipment is listed in (see
“Tools and Auxiliary Equipment” on Page 109).
9.3.5 Checking the Contact Resistance
• Check the contact resistance as described in the commissioning
section.
9.3.6 Checking the Operating Times
• Check the operating times as described in the commissioning
section.
9.3.7 Checking the Threaded Connections
• Check all accessible threaded connections (screwed or bolted
joints) to make sure they are tight.
The tightening torques are given in the following sections:
- Installation
- Commissioning
- Troubleshooting
- Reconditioning
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