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Medium-voltage surge arresters - Siemens· PDF filegear (GIS). Siemens begins developing surge arresters. The first devices are of the so-called cathode drop type. The 3EQ2 surge arrester for systems of up to 550 kV is one of the first high-volt-age surge arresters with composite polymer hollow core housing. Werner von Siemens dis-covers the dynamo-electric principle, which enables

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