{"id":7917,"date":"2025-11-05T01:38:47","date_gmt":"2025-11-05T01:38:47","guid":{"rendered":"https:\/\/www.raxpower.com\/?page_id=7917"},"modified":"2026-08-12T04:28:15","modified_gmt":"2026-08-12T04:28:15","slug":"metalloxid-uberspannungsableiter","status":"publish","type":"page","link":"https:\/\/www.raxpower.com\/de\/surge-arrester-cutout\/metal-oxide-surge-arrester\/","title":{"rendered":"Metalloxid-\u00dcberspannungsableiter"},"content":{"rendered":"
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Metal Oxide Surge Arrester<\/h2>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>
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Metal Oxide Surge Arresters safeguard high voltage equipment from overvoltages caused by lightning strikes or switching operations. Built around zinc oxide varistors, these gapless devices provide a non-linear voltage-current characteristic that enables effective operation across various voltage levels in power systems. The elimination of spark gaps removes the risk of spark over and system shock, while the absence of voltage grading systems simplifies design. They exhibit very low leakage currents under normal conditions and possess high energy absorbing capability with stability during prolonged discharge events.<\/p>\n

Applications span substations protecting transformers and switchgear, power transmission and distribution systems, and industrial environments including mining, railways, and renewable energy installations. The arresters shield electrical motors, control systems, and other critical equipment from transient overvoltages.<\/p>\n

Construction features a column of zinc oxide semiconductor resistors stacked within polymer or porcelain housings. Polymer designs often use silicone rubber that maintains hydrophobic, Ultraviolet (UV)-resistant, and non-ageing properties, while composite insulators may incorporate a fiberglass reinforced plastic tube with molded silicone rubber sheds. Robust sealing systems prevent moisture ingress, and pressure relief diaphragms provide safety during overloads. Grading rings ensure even voltage distribution in high voltage applications.<\/p>\n

Technical specifications include rated voltages from distribution levels up to 800 kilovolts (kV), nominal discharge currents of 10 or 20 kiloamperes (kA), and operation within -40\u00b0C to +40\u00b0C ambient temperatures. Compliance with International Electrotechnical Commission (IEC) 60099-4 and IEEE standards ensures international requirements for performance and reliability are met.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div>