Safety
Overhaul Instructions
4
1HSB435409-201 enrev1
2.2 Safety directives
On all types of work on high-voltage circuit-breakers, the risks listed below must be
taken into consideration and corresponding measures must be taken.
WARNING
Circuit -breakers with pressurised porcelain insulators.
Mechanical damage to the porcelain can cause it to explode with the
following risk of splintering.
Work on the circuit-breaker that brings about the risk of mechanical
damage to the insulators should be carried out at a reduced gas pressure,
0.125 MPa (abs).
WARNING
Do not operate the mechanism unloaded!
Operations shall take place only after the mechanism has been connected
and trimmed with the associated circuit-breaker.
The standard opening cycle is O- 0.3 s - CO - 3 min. - CO. The time between
closing operations should not be less than 1 minute when testing circuit-breakers
and relay systems that comprise more than 3 operations.
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