Automatic isolator switch

high-voltagenon-fusedgrounding

The electrostatic atomizers - guns, rotating bell units, blades, etc. - their High Voltage cables and the connected generators have altogether a more or less high electrical capacity. When electrically charged they store an energy equal to ½ CV2 where C is the capacity of the system and V the applied voltage. When the generator is switched off this energy is dissipated in the surrounding air during a time T changing from few seconds to many minutes. The time T is influenced by the insulation properties of the system, by the electrodes shape and by the umidity and temperature of the surrounding atmosphere. The CENELEC EN 50176 European Standard concerning the automatic electrostatic painting equipment claims that any part under high voltage should be discharged within two seconds down to a discharge energy level lower than 350 mJ before letting personnel enter inside the enclosure. To get a similar effect in the safest way we have designed and patented the ELETTROSPRAY® Earthing Switch here described which satisfies the prescription of the Standard above as proven by TÜV Test Report No. SIC02067.00. The Earthing Switch should be fitted in the High Voltage circuit after the cascade. When one of the doors of the enclosure is opened the Switch is actuated discharging to the earth through a suitable resistor the whole HV circuit. All the energy stored in the system is in this way quickly dissipated and once the doors are opened the operators can touch the bells, the electrodes or the blades in full safety without fear of any electrical shock.