2.4-34.5kV Protective links/Weak Links

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Category: IEEE Accessories

TThe protective link (Weak Link) is an oil immersed, expulsion type fuse designed for use in the high voltage circuit of a distribution transformer. Westinghouse originally developed the protective link as part of the CSP system of distribution transformer protection. When used in the CSP scheme, the function of the protective link is to disconnect a defective transformer from the feeder circuit and to limit the severity of the damage to the transformer in case of an internal fault.

Protective links are available in a variety of fuse sizes and voltage classes. In most applications today, the protective link is used in series with a partial range or back-up current limiting fuse. The series combination of protective link and back-up type current limiting fuse adds an additional layer of fuse coordination that must be performed for proper functioning of both devices.

— Protective Link/Weak Link （<=23kV）

— Protective Link/Weak Link （<=34.5kV）