Overhaul Instructions
Dismantling the circuit-breaker
1HSB435409-201 enrev1
9
4. Dismantling the circuit-breaker
4.1 General
Before the circuit-breaker is dismantled and during the course of the dismantling
work, the directives in the Operating and Maintenance Instructions
1HSB435409-100 must be read and followed:
Check and note down the circuit-breaker’s operating values before dismantling.
Any deviation from the recommended values indicates that something must be
carefully checked during the overhaul.
There are two different methods for implementing the overhaul:
•
First and foremost it is recommended that the entire circuit-breaker is
dismantled for transport to a service workshop, where it can be dismantled in
detail for the overhaul.
•
Alternatively, and secondly only the breaking unit is dismantled.
The latter method does not entail so much work, but it may only be used when the
weather is settled and the outdoor working conditions are similar to indoor
conditions.
N. B.
Removal and assembly of the breaking units must not be done when the
weather is such that there is a risk of rain.
WARNING
This work requires trained staff with product knowledge and may only be
carried out by authorised personnel.
4.1.1 Preparations for the overhaul
The following must be done before starting the overhaul:
•
Operate the circuit-breaker to the Open position.
•
Isolate and earth.
•
Off-load the spring battery in the operating mechanism by switching off the
motor current and implementing a Close-Open operation.
•
Switch off the control voltage and, if necessary, also the heater power.
Summary of Contents for SF6 LTB 245E1 BLG 1002A
Page 1: ...Product Manual 1HSB435416 2 en Rev 1 LTB 245E1 BLG 1002A 3 pole operation ...
Page 92: ...ABB Switchgear SF6 Circuit Breaker Circuit breakers HPL and LTB 1HSB445409 1 en0 Lubricants ...
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