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The core advantages of needle insulators are simple structure, low cost, easy installation and maintenance, and mechanical and electrical performance that meets the needs of medium and low voltage distribution. These characteristics make it the most widely used and economically practical insulator type for straight poles and small angle angle poles in medium and low voltage distribution networks, especially for overhead lines of 11kV and below. For higher voltage levels or special environments (such as heavily polluted areas, large spans, and large corners), other types of insulators (such as suspension insulator strings, post insulators, composite crossbar insulators, etc.) need to be considered.