We have ABB MTS 245 kV Module. We need to test control circuit and healthy operation of CB opening & closing in de-energization condition which means no actual voltage of 220 kV. We need these testing without SF6 gas filling, is it possible to test CB without gas filling ? If no then what is minimum level of sf6 to be maintain ? Thank u.
It is not possible to operate the module without gas due to risk of mechanical damage. In fact the gas dynamic inside the breaking chamber has a mechanical damping effect, without this function we cannot guarantee against mechanical damage during testing.
The minimum gas pressure needed to safely operate the de-energized module is the module’s locking pressure.
Nitrogen, at locking pressure, could be used as alternative gas to SF6 just for the purpose of mechanical operation, with the equipment de-energized. Of course, it is then needed to vacuum the nitrogen and fill in SF6 before putting the equipment into service.
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