Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1998-10-13
2000-08-15
Ballato, Josie
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324141, 324140R, G01R 700
Patent
active
061041823
ABSTRACT:
Current and voltage space vectors of the positive sequence system are formed from phase current and phase voltage sampling values of an electric power supply system, and power quantities of the positive sequence system are derived from them. System frequency components are eliminated from these power quantities by a least squares estimate, thus forming a measured active power quantity of the positive sequence system and a measured reactive power quantity of the positive sequence system. By forming quotients with a measured current quantity of the positive sequence system, also obtained using the least squares estimate, impedance values of the positive sequence system are also obtained. These are tested for monotony and abrupt changes and a suspected oscillation signal is formed, if applicable. In addition, to obtain an oscillation confirmation signal, the respective center point of the circle of the trajectory formed by the impedance values of the positive sequence system is determined and compared with the reactance value of the positive sequence system with regard to its imaginary part. If a suspected oscillation signal and an oscillation confirmation signal occur simultaneously, the oscillation signal is formed.
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*A. Jurisch, "Digitale Impedanzmessverahren auf der Basis von Identifikationsmethoden" [Digital Impedance Measurement Methods Based on Identification Methods], TH Zittau, 1990, pp. 58-70. (no month).
* Jahn et al., "Koordinatentransformationen zur Behandlung von Mehrphasensystemen" [Coordinate Transforms for the Treatment of Multi-Phase Systems], Archiv fur Elektrotechnik [Archives for Electrical Engineering], Archive for Electrical Technology, Springer Verlag, vol. 56, 1974, pp. 105-11. (no month).
Jurisch Andreas
Schwenke Micheal
Ballato Josie
Hollington Jermele M.
Siemens AG
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