DC current of large pre baked anode bus is about 300-500KA。 The workshop series voltage reaches hundreds of volts to kilovolts, and the average voltage of each slot is 4.15-4.3V. Although people set the voltage at the midpoint of the series, the ground voltage at both ends of the series is still as high as about 500V. In case of short circuit, personal and equipment accidents are likely to occur.
Electrolytic cells operate in series with low voltage and high current, so the electric shock event of a single electrolytic cell is usually not serious. However, the short circuit to ground after several electrolytic cells are connected in series in the electrolytic workshop may cause serious electric shock accidents. The electrolyzer uses DC power, and the electrical equipment on the electrolyzer uses AC power. If DC goes into the AC system, it will cause equipment accidents. Therefore, many parts of the electrolyzer must be insulated. In electrolytic workshop Cable If effective flame-retardant and other Measures to prevent damage to the cable layer, incomplete grounding and neutral connection measures for electrical equipment, and no leakage protector is used for temporary and mobile equipment power supply Insulating material Unreliable, such as the metal shell of electrical equipment with spots due to poor internal insulation, will cause electric leakage of electrical equipment and cause electric shock casualties.
Necessity of ground insulation around electrolytic cell: transfer aluminum liquid, replace anode, salvage slag, ground Aluminum plate Lapping is equivalent to the change of the dielectric between the original capacitor plates from air to aluminum plate conductor, resulting in the reduction of the spacing between the steel plate and the aluminum plate, the reduction of the breakdown voltage, the breakdown of the concrete, and the explosion. Insulating materials are required to be specific and resistant to high temperature, voltage breakdown, electrolyte, aluminum splash, and cement Ground breakdown to prevent electric shock.
ZS-1091 high temperature resistant ceramic insulating coating can withstand 1800 ℃ and has good adhesion. It can be painted on any material to resist the passage of insulation shielding current under high temperature and corona discharge. The coating is dense, has high resistivity, good dielectric constant, will not produce electronic seepage and tunnel effect, and has high hardness and long wear resistance service life.
Other parts of the electrolytic aluminum workshop that need insulation protection, bus ducts, all line ducts, distribution boxes, line ducts, smoke pipes and all metal structure surfaces near the electrolytic aluminum workshop, as well as the parts that metal tools touch or are easy to touch. Can be constructed ZS-1091 high temperature resistant ceramic insulating coating can prevent electric shock injury, ensure safe production, protect personal safety, increase insurance coefficient and reduce safety accidents.
