Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Reexamination Certificate
2005-10-18
2005-10-18
Nguyen, Vinh P. (Department: 2829)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
C324S126000, C324S127000
Reexamination Certificate
active
06956363
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 invention, charge measuring values are determined using charge measuring devices. The measured charge values take into account the direction of the charge flow and 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. In order to be able to detect errors in a more sensitive manner than had previously been possible, the threshold value is formed by taking into account the individual measuring tolerance of the individual charge measuring devices.
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.
Leonard J. Ernst et al., “Charge Comparison Protection of Transmission Lines—Relaying Concepts”; IEEE Transactions on Power Delivery, vol. 7, No. 4, Oct. 1992.
Kerger Torsten
Ngambo Yves Ngounou
Philippot Luc
Morrison & Foerster / LLP
Nguyen Vinh P.
Siemens Aktiengesellscaft
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