(57) A leak indicator for a gas filled electrical plant, with the leak indicator being
of the Bourdon tube kind, the Bourdon tube being filled with a gas having the same
properties as the gas surrounding the Bourdon tube, and being in a sealed state, the
nominal gas pressure in the plant deviating from the ambient atmospheric pressure.
The free end of the Bourdon tube is arranged to influence a switch means, preferably
a multi-step switch having at least two terminals. The leak indicator may be supplied
with voltage directly from the plant, irrespective of the direction of supply to the
plant, as a first terminal of the switch means may be capacitively connected with
a high voltage bushing in the plant, and a second terminal may be connected with a
first clamp of a voltage indicator, the second clamp of said voltage indicator being
connected to earth, and as there will be contact between said first and second terminals
in case of a normal state of the plant, and as there will be no contact between said
terminals in case of a deviation from the normal state.
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