Apparatus for detecting out of phase of power systems and method

Details Apparatus for detecting out of phase of power systems and method Apparatus for detecting out of phase of power systems and method

1994-03-23

1996-07-23

Voeltz, Emanuel T.

Boots, shoes, and leggings

364492, 324 7674, 324 7677, 322 20, 323212, G01R 2500

Patent

active

055396550

ABSTRACT:
An out of phase detecting apparatus according to the present invention includes a measurement unit for measuring an effective power and a current effective value at a tie point of power systems at a predetermined cycle, a power trend detection unit for detecting a trend of the effective powers measured in sequence by the measurement unit, a current trend detection unit for detecting a trend of the current effective values measured in sequence by the measurement unit, a power level determination unit for determining a relationship in strength between each of the measured powers and a steady effective power P.sub.0 obtained when the power systems are in a steady state, and an out of phase detection unit for detecting whether an out of phase condition occurs in the power systems based on the trend of the measured effective powers, the trend of the measured current effective values, and the relationship in strength between the steady effective power P.sub.0 and each effective power.

REFERENCES:
patent: 4249088 (1981-02-01), Kleba et al.
patent: 4757263 (1988-07-01), Cummings, III et al.
patent: 4996471 (1991-02-01), Gallo
patent: 5107447 (1992-04-01), Ozawa et al.
Takahashi et al., "Fast Generation Shedding Equipment Based on the Observation of Swings of Generators," IEEE Transactions of Power Systems, vol. 3, No. 2, May 1988, pp. 439-446.
Ohura et al., "A predictive out-of-step protection system based on observation of the phase difference between substations," IEEE Transaction on Power Delivery, vol. 5, No. 4, Nov. 1990, pp. 1695-1704.

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