The device (1) has a metallic enclosure e.g. shield (4), for receiving and containing charge (2), and a wall (12) defining a primary enclosure (11) around the shield. A capillary structure (6) e.g. porous or fibrous material layer, is in contact with a water reserve (10) for applying a liquid layer or a wet layer around the shield. Maintenance unit formed of condenser, displacement pump (18), sonic nozzle and electric compensatory resistor, constantly maintains temperature outside the shield and the temperature and/or pressure of vapor in the primary enclosure. An independent claim is also included for a calorimetric method for measuring residual power of charge.
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