Differential protective method to generate an error signal...

Details Differential protective method to generate an error signal... Differential protective method to generate an error signal...

2005-03-15

2005-03-15

Nguyen, Vinh P (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

C324S126000, C324S127000

Reexamination Certificate

active

06867577

ABSTRACT:
The invention relates to a method for generating an error signal which characterizes a fault current in an electrical conductor provided with two conductor ends and having charge measuring devices which are connected to each other by data lines. At least one device is attached to each end of the conductor. In the inventive method, charge measuring values are determined using charge measuring devices. The measured charge values take into account the direction of the charge flow a total measured charge value is formed by addition. The error signal is generated when the total measured charge value exceeds a certain threshold value. According to the invention, the measured charge values are determined synchronously and determined repeatedly at regular intervals in such a way that the time interval between each sequential determination is smaller than the predefined measuring period.

REFERENCES:
patent: 4939617 (1990-07-01), Hoffman et al.
patent: 5077520 (1991-12-01), Schweitzer, Jr.
patent: 5206596 (1993-04-01), Beihoff et al.
patent: 5565783 (1996-10-01), Lau et al.
0885-8977/92, “Charge Comparison Protection of Transmission Lines—Relaying Concepts”; by Leonard J,Ernst et al.; IEEE Transactions on Power Delivery, vol. 7, No. 4, c. 1992.

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