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17. Maintenance
Caution : We recommend that the inspection intervals given in Table 8 for normal and extreme ambient
conditions be complied with. They are essential to the trouble-free operation of the equipment.
Warning : In the case of work on high-voltage equipment, there is danger to life if the applicable safety
rules are not observed and complied with.
Inspection intervals
Table : 8 Inspection intervals for normal and extreme ambient conditions
Ambient condition Inspection intervals
Year of
commissioning
Normal
After every 5 operating years or
After every 1 000 switching cycles
Extreme
After every 2.5 operating years or
After every 500 switching cycles
Extreme ambient conditions
The examples given below for extreme ambient conditions are based on our experience :
• Climate (tropical, arctic)
• Heavy contamination (dust, salt, rust, sulphur)
Special tools and materials
The repair operations require the use of the following special tools and material in addition to the
standard tools :
• Brass-wire brush for treatment of copper surfaces
• Steel-wire brush for treatment of aluminium surfaces
• Steel-wire brush for treatment of zinc surfaces
• Contact grease Termalene Grease 64 444
• Cold cleaning agent for silver-faced surfaces
• Lint-free cloths
Admissible torques for bolts
Unless these service instructions specify special values for torques, the standard values given in Table
9 shall apply.
Table 9 : Permissible torques for bolts (standard values)
Thread
Torques in Nm
Steel, galvanized
Steel, rustproof
A-270, A4-70
Thread in aluminium
Strength
8.8
M6 - 7 5.5
M8 - 16 14
M10 42 33 26
M12 72 56 45
M16 174 122 100
1HDB 050016-YN-A
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