Operating and Maintenance Instructions
Preventative maintenance
1HSB435409-100 en1 5
2.1.4 Cleaning the outside
The circuit-breaker insulators must be cleaned from salt and other contaminant
deposits at the same time as the cleaning of the other insulators in the substation.
The time interval for cleaning depends on local conditions, i.e. the amount of
atmospheric pollution.
N.B. All LTB E circuit-breakers are completely hose-proof, , i.e. circuit-breakers
in operation can be cleaned with high-pressure water without any risk of
water entering the circuit-breaker and causing damage to essential parts.
2.1.5 Lubricating the circuit-breaker
Use only the lubricants recommended in the document “Lubricants 1HSB445409-1”.
This is particularly important in cold climates with temperatures below -25˚C.
When supplied, the circuit-breaker bearings are lubricated with Grease “G”
1
and
will not normally need lubricating except during major overhauls.
See the Overhaul instructions applicable for the circuit-breaker, for lubricating
sealing rings.
2.1.6 Rust protection
The opening springs are rust inhibited by painting with two-component paint.
2.2 Operating mechanism
2.2.1 Maintenance
Work on the operating mechanism with the circuit-breaker in the Closed position
and with tensioned closing springs always involves a certain risk. It is therefore
important that the guidelines in the document “Product information BLG 1002A”
or, “Product information BLK 222”, Safety regulations, are followed before the
work is started.
2.2.2 Cleaning
Clean the operating mechanism when necessary using a vacuum cleaner.
Check that the filters in the valves are clean. Replace them if they are dirty.
1. See the document “Lubricants” 1HSB445409-1 for the names of suppliers and brands for
grease and oils.
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