Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1983-08-31
1985-12-17
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
364492, G01R 3108
Patent
active
045594910
ABSTRACT:
A fault point in a line section of a three-phase power transmission line, is determined by measuring currents and voltages at a measuring point arranged adjacent the near end of the section. The type of fault (single-phase/multi-phase ground fault/phase-to-phase fault) is determined and the parameters in a quadratic equation are determined using the relative distance (n) from the measuring point to the fault point as a variable. The equation is derived in advance from the electrical relationships between the complex values of the line impedance, the source impedances of the networks located ahead of and behind the fault, and measured currents and voltages following elimination of the fault resistance and possible zero sequence components. The parameters in the equation are determined by the type of the fault, by the measured voltages and currents and by said impedances. The equation is solved directly by means of a numerical square root method. When calculating the parameters, the fundamental frequency components of the measured values are used, which components are obtained by digital filtering of the measured values.
REFERENCES:
patent: 3593124 (1971-07-01), Cahen et al.
patent: 4313169 (1982-01-01), Takagi et al.
Pratesi et al., Fault Locators for Overhead Lines, Electra, No. 34, pp. 211-217.
Paithankar et al., On-Line Digital Fault-Locator for Overhead Transmission Line, May 1978, pp. 1-6, IEEE.
Saha et al., An Accurate Fault Locator with Compensation for Apparent Reactance in the Fault Resistance Resulting from Remote-End Infeed, Feb. 1985, IEEE Transactions on Power Apparatus and Systems, vol. PAS-104, No. 2, pp. 424-436.
Hagenmeyer et al., Decentralized Fault Location Combined with Centralized Computer Evaluation in a Main Control Centre Gives Optimized Network Operation, 9-1982, pp. 1-8.
Bibliography and Summary of Fault Location Methods, AIEE Committee Report, Feb. 1956.
Godard, Electrical Utility Load Forecasting, Feb. 1956, AIEE, p. 1428.
Stevens et al., Frequency Modulated Fault Locator for Power Lines, Dec. 1971, pp. 1760-1768.
Humpage et al., Measuring Accuracy of Distance Protection with Particular Reference to Earth-Fault Conditions on 400 KV Looped-Circuit Interconnections, Proc. IEE, vol. 117, No. 2, Feb. 1970, pp. 431-438.
Saha et al., Microprocessor-Based Accurate Fault Locator with Remote-End Infeed Compensation, IEE Third International Conference on Developement of Power System Protection, Apr. 1985, pp. 193-198.
Stringfield et al., Fault Location Method for Overhead Lines, AIEE, Aug. 1957, pp. 518-528.
ASEA Aktiebolag
Harvey Jack B.
Krawczewicz Stanley T.
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