| US 7,526,392 B2 | ||
| Power line parameter analysis method and system | ||
| Michael L. Gasperi, Racine, Wis. (US); David L. Jensen, Barneveld, Wis. (US); and David T. Rollay, Franklin, Wis. (US) | ||
| Assigned to Rockwell Automation Technologies, Inc., Mayfield Heights, Ohio (US) | ||
| Filed on Mar. 30, 2005, as Appl. No. 11/94,389. | ||
| Prior Publication US 2006/0229831 A1, Oct. 12, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G01R 21/00 (2006.01) | ||
| U.S. Cl. 702—60 [702/59; 702/62; 702/65; 324/521; 600/547] | 15 Claims |
| 1. A method comprising:
measuring a parameter of an ac waveform applied to an electrical line;
computing a line impedance based upon the parameter;
computing a bolted fault current based on the line impedance;
measuring a first voltage of the ac waveform applied to the electrical line;
draining current from the line and measuring a second voltage of the ac waveform during a droop in voltage resulting from
the current drain; and
removing the current drain to cause a resonant ring in the voltage in the line,
wherein the parameter of the ac waveform is a frequency of the resonant ring.
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