Power-line sag calculation by way of power-system state...

Details Power-line sag calculation by way of power-system state... Power-line sag calculation by way of power-system state...

2007-02-05

2009-02-24

Verbitsky, Gail (Department: 2855)

Thermal measuring and testing

Thermal testing of a nonthermal quantity

C374S185000, C702S130000

Reexamination Certificate

active

07494271

ABSTRACT:
A sag calculator (122) computes sag for a span of a section of a power line based at least in part upon a temperature of conductor lines in the line section. A temperature calculator (120) determines the temperature by computing a resistance ascertained through augmented state estimation techniques performed by a state estimator (118). A Supervisory Control and Data Acquisition (SCADA) system (104) acquires data used by the state estimator (118) to compute the resistance.

REFERENCES:
patent: 4420752 (1983-12-01), Davis et al.
patent: 4723220 (1988-02-01), Smith-Vaniz
patent: 5235861 (1993-08-01), Seppa
patent: 5517864 (1996-05-01), Seppa
patent: 5918288 (1999-06-01), Seppa
patent: 5933355 (1999-08-01), Deb
patent: 6441603 (2002-08-01), Lawry
patent: 6523424 (2003-02-01), Hayes et al.
patent: 2007/0038396 (2007-02-01), Zima et al.
patent: 2008/0204054 (2008-08-01), Wells
patent: 1887673 (2008-02-01), None
IEEE Standards Board, IEEE Standard for Calculating the Current-Temperature Relationship of Bare Overhead Conductors, IEEE Std 738-1993, approved Jun. 17, 1993, Cover page-47.
Seppa, et al., Accurate Ampacity Determination: Temperature—Sag Model for Operational Real Time Ratings, IEEE Transactions on Power Delivery, Jul. 1995, pp. 1460-1470, vol. 10, No. 3.
Douglass, et al., Field Studies of Dynamic Thermal Rating Methods for Overhead Lines, IEEE Transmission and Distribution Conference 1999, Apr. 11-16, 1999, pp. 842-851, vol. 2.
IEEE Task Force “Bare Conductor Sag at High Temperature”, Limitations of the Ruling Span Method for Overhead Line Conductors at High Operating Temperatures, IEEE Transactions on Power Delivery, Apr. 1999, pp. 549-560, vol. 14, No. 2.
Fink, et al., Standard Handbook for Electrical Engineers, Oct. 1999, 14-41-14-112, Fourteenth Edition, McGraw-Hill.
Holbert, et al., Prospects for Dynamic Transmission Circuit Ratings, ISCAS 2001. The 2001 IEEE International Symposium on Circuits and Systems, 2001, May 6-9, 2001, pp. III-205-III-208, vol. 2.
Power Technologies, Inc., Increasing Power Transfer Capability of Existing Transmission Lines, presentation, 2003, slides 1-51.
United States Department of Agricultuer Rual Utilities Service, The Mechanics of Overhead Distribution Line Conductors, Bulletin 1724E-152, Jul. 30, 2003, pp. 1-20.
Dale Douglass, Sag-tension Calculation, A Tutorial Developed for the IEEE TP & C Line Design Subcommittee, based on CIGRE WG B2.12 Technical Brochure under Development, Jun. 13, 2005, 33 pages.

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