DISCHARGE ARRESTER FOR LIGHTNING OVERVOLTAGE PROTECTION OF ELECTRICAL EQUIPMENT OR AN ELECTRICAL POWER TRANSMISSION LINE, AND INSULATOR AND ELECTRICAL POWER TRANSMISSION LINE EQUIPPED WITH SUCH DISCHARGE ARRESTER

摘要

The present invention relates to a discharge arrester (100) for lightning overvoltage protection of electrical equipment or a power transmission line, the arrester comprising an insulating body (1) made of a dielectric, two main electrodes (2, 3) mechanically connected to the insulating body (1), and at least two intermediate electrodes (4) mechanically connected to the insulating body (1) and disposed between the main electrodes (2, 3) in such a way that an electric discharge can develop between adjacent main and intermediate electrodes as well as between adjacent intermediate electrodes, the intermediate electrodes (4) being disposed inside the insulating body and separated from its surface by a dielectric layer, wherein discharge chambers (6) opened to the surface of the insulating body (1) are made between the intermediate electrodes (2, 3, 4). The discharge arrester (100) is characterized by that it provides a water supply means (5) for supplying water to at least one discharge chamber (6). The discharge arrester ensures efficient extinguishing of impulse lightning overvoltage arc. Further, the invention relates to an insulator and to an electric transmission line equipped with said discharge arrester.