METHOD AND APPARATUS FOR DETECTING LOSS OF SYNCHRONISM IN POWER SYSTEM

WIPO Patent Application WO/2003/048792

A1

An apparatus for detecting loss of synchronism of a power system capable of reliably detecting loss of synchronism caused between generators at both ends of an interconnection tie of a power system regardless of a particular phase angle difference. The apparatus (6) for detecting loss of synchronism of a power system includes an analog/digital converter (7) for acquiring voltage V and current I of the transmission line (3) of the power system (1a), average value calculation means (96) for calculating average values of the voltage and the current for a predetermined interval by a judgment moment according to the voltage and the current acquired, maximum/minimum judgment/storage means for extracting and storing the maximum values and minimum values of the average values of the voltage and the current, phase angle difference calculation means (98) for calculating a phase angle difference from the voltage and the current, and loss-of-synchronism judgment means (101) for judging that the synchronism is lost when the phase angle difference exceeds 90 degrees and if the average value of the measured voltage is within a predetermined range around the minimum value of the average value of the voltage stored and the average value of the measured current is within a predetermined range around the maximum value of the average value of the current stored.

SATO MASAHIRO (JP)

PCT/JP2002/012636

June 12, 2003

December 03, 2002

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UNIV SCHOOL NIHON JURIDIC PER (JP)
SATO MASAHIRO (JP)

G01R25/00; G01R29/18; H02H3/38; H02H3/48; H02J3/24; H02J3/38; (IPC1-7): G01R29/18

JPH02211021A	1990-08-22
JPH05180890A	1993-07-23
JP2000162258A	2000-06-16

Otaki, Hitoshi (7-7 Ueno 3-chom, Taito-ku Tokyo, JP)

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