Charge comparison protection of transmission lines-relayingconcepts |
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Authors: | Ernst L.J. Hinman W.L. Quam D.H. Thorp J.S. |
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Affiliation: | Dowty Control Technologies, Boonton, NJ; |
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Abstract: | The authors describe the relaying concepts of charge comparison. Charge comparison is a new transmission line protection system. It is a form of current differential relaying. Charge comparison largely resolves the traditional problems of current differential relaying of transmission lines, which are that protection is lost if a channel fails, a large channel capacity is required, and precise channel delay compensation is required. This technique is suitable for the protection of two- or three-terminal AC transmission lines, of all lengths and voltage levels, with or without series of shunt compensation, with three-hole or single-pole tripping |
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