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New current differential protection and fault‐location scheme for multiterminal lines
Author(s) -
Nagasawa Takashi,
Deno Kenichi,
Yoshimi Masashi,
Matsunaga Kanzo,
Itou Kenji
Publication year - 1995
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391150502
Subject(s) - fault (geology) , electrical impedance , terminal (telecommunication) , electronic engineering , electric power transmission , voltage , current (fluid) , engineering , differential protection , power system protection , scheme (mathematics) , electrical engineering , computer science , control theory (sociology) , telecommunications , mathematics , electric power system , power (physics) , physics , control (management) , artificial intelligence , seismology , geology , mathematical analysis , quantum mechanics , transformer
This paper presents a new scheme of protection and fault location in multiterminal high‐voltage lines. The new protection scheme is PCM (Pulse Code Modulation) current differential protection using OPGW (Optical Fiber Ground Wire). This scheme can be applied to protection up to 8‐terminal transmission lines. This scheme has coped with the miss trip in the cause of CT‐saturation. But this may have an opposite result, i.e., obstruction of trip during 4‐cycle. Then, the index to cope with the miss trip for CT‐saturation is proposed. The aforementioned system obtains various information at each terminal (e.g., current data and CB‐condition, et al.). Then, a fault location scheme is developed using this information. It has two kinds of techniques using the synchronized current data of multi‐terminal lines. One technique is to measure the current diversion ratio with current of each terminal. The other technique is to measure impedance using current of each terminal and voltage. This scheme can automatically choose between the two technique at fault type. The equipment using this scheme has obtained a good result in the field.