ABB SF6 LTB 245E1 BLG 1002A, Product Manual

Page: 88 / 231

Operating and Maintenance Instructions Inspection intervals
1HSB435409-100 en1
17
9.
Tightness of the SF
6
gas
• Density monitoring
15 years or 5,000 mech. CLOSE/
OPEN operations. Check the density switches and
signal/blocking circuits.
Accurancy test of the pressure gauge
must be done at standard reference
atmosphere i.e. +20
˚C and 101.3 kPa
(1013 mbar).
Remove the density switch from the
circuit-breaker for checking of function.
N.B. Min permissible voltage for test
of the circuits in the density
switch (30 V).
See applicable Assembly Instruction for
the circuit-breaker.
10.
Blocking relays 15 years or 5,000 mech. CLOSE/
OPEN operations. The relays shall close when a density
switch is pulled out from a pole
pressurized to filling pressure.
11.
Corrosion 15 years or 5,000 mech. CLOSE/
OPEN operations. Outside:
Visual check, particularly check
protected components in non heated
compartments, pull-rod system, clevis
couplings, springs.
Treat with anti-rust oil if necessary.
See Chapter 2.2.4 and Manual
1HSB515409-100 for BLG 1002A or
1HSB535409-100 for BLK 222.
12a.
Lubrication 15 years or 5,000 mechanical
Close-Open operations. Inspect and lubricate the latches.
See Chapter 2.1.5 , Chapter 2.2.3 and
Manual 1HSB515409-100 for BLG
1002A or 1HSB535409-100 for BLK
222.
To be inspected Inspection interval Measures / Instructions /
Tools