Từ một vài năm, hãm với polymer-nơi ở đã được có sẵn trên thị trường để phân phối và hệ thống điện trung thế. Trong những năm gần đây, điều này loại hãm đã được đưa ra cũng trên cao hệ thống điện áp lên đến và bao gồm 550 kV. Tuy nhiên, công tác tiêu chuẩn hoá quốc tế xa phía sau này phát triển nhanh và nhiều hiện thiết kế với polymer-nơi ở cho highvoltage hệ thống chỉ được thử nghiệm theo các tiêu chuẩn IEC hiện hành, IEC 99-4 năm 1991, trong đó nói chung chỉ bao gồm hãm với sứ nơi ở. . | DESIGN AND TESTING OF POLYMER-HOUSED SURGE ARRESTERS by Minoo Mobedjina Bengt Johnnerfelt Lennart Stenstrom ABB Switchgear AB Sweden Abstract Since some years arresters with polymer-housings have been available on the market for distribution and medium voltage systems. In recent years this type of arresters have been introduced also on higher voltage systems up to and including 550 kV. However the international standardisation work is far behind this rapid development and many of existing designs with polymer-housings for high-voltage systems have only been tested according to the existing IEC standard IEC 99-4 of 1991 which in general only covers arresters with porcelain housings. The existing IEC standard lacks suitable test procedures to ensure an acceptable service performance and life time of a polymer-housed surge arrester. In particular tests to verify the mechanical strength short-circuit performance and life time of the arresters are missing. In this report different design alternatives are discussed and compared and relevant definitions and tests procedures regarding mechanical properties of polymer-housed arresters are presented. Necessary design criteria and tests to verify a sufficiently long life-time as well as operating duty tests to prove the arrester performance with respect to possible energy and current stresses are given. The advantages of silicon insulators under polluted conditions are discussed Finally this report presents some new areas of applications which open up due to the introduction of polymer-housed arrester designs. One such is protection of transmission lines against lightning switching surges so as to increase the reliability and security of the transmission system. 1. INTRODUCTION Short historical background Surge arresters constitute the primary protection for all other equipment in a network against overvoltages which may occur due to lightning system faults or switching operations. The most advanced gapped SiC arresters .
