Fault locator that uses positive-phase-sequence electricity

Details Fault locator that uses positive-phase-sequence electricity Fault locator that uses positive-phase-sequence electricity

1999-09-20

2000-08-01

Wu, Daniel J.

Communications: electrical

Systems

Selsyn type

34031006, 34082516, H04M 1104

Patent

active

060972807

ABSTRACT:
A fault locator of a parallel transmission line includes a data receiving unit that receives the transmission and the received signal of each current differential relay provided with the transmission line, and measures the receiving timing of the transmission signal from a self-terminal. A fault detecting unit judges fault detection on the transmission line based on current data received with the data receiving unit, and outputs a starting signal. A data memory unit stores a predetermined fault generating range of a quantity of electric data of each self-terminal previously stored and an other side terminal when the quantity of electric data of each self terminal received with the data receiving unit and the other side terminal are stored and a starting signal is received. A synchronous correction unit, based on information on the receiving timing measured with the data receiving unit at the time of data reception of a self-terminal transmission signal, performs synchronous correction processing between each line to the stored memory. A setting unit inputs an impedance value and the line-length for three-phases as a setting value. A fault location unit performs fault location, using impedance setting for three-phases and line-length setting which were set with the stored memory data and the setting unit and the synchronous correction processing between each line that was performed in the synchronous correction unit.

REFERENCES:
patent: 3586968 (1971-06-01), Barjot
patent: 4077004 (1978-02-01), Higo
patent: 4455644 (1984-06-01), Fox et al.
patent: 4755792 (1988-07-01), Pezzolo et al.
patent: 5352957 (1994-10-01), Werner

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