Data processing: measuring – calibrating – or testing – Measurement system – Temperature measuring system
Reexamination Certificate
2007-02-05
2009-11-17
Raymond, Edward (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system
Temperature measuring system
Reexamination Certificate
active
07620517
ABSTRACT:
A sag calculator (112) computes sag for a span of a line section based at least in part upon an average temperature of the conductors in the line section. A temperature calculator (110) determines the temperature by ascertaining an ohmic resistance of the conductor lines based at least in part upon time-synchronized power system voltage and current measurements such as (but not limited to) phasor measurements generated by phasor measurement units (104, 106). The temperature calculator (110) determines the temperature as a function of the ohmic resistance.
REFERENCES:
patent: 3676578 (1972-07-01), Cahill
patent: 5181026 (1993-01-01), Granville
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: 6205867 (2001-03-01), Hayes et al.
patent: 6229451 (2001-05-01), Brown
patent: 6304838 (2001-10-01), Brown
patent: 6441603 (2002-08-01), Lawry
patent: 7093416 (2006-08-01), Johnson et al.
patent: 2005/0222808 (2005-10-01), Zima et al.
patent: 2007/0038396 (2007-02-01), Zima et al.
patent: 2007/0200556 (2007-08-01), Engelhardt
Leonard Lee Grigsby, The Electric Engineering Handbook, 2000, CRC Press, 4-99 and 4-100.
IEEE Standards Board, IEEE Standard for Calculating the Current-Temperature Relationship of Bare Overhead Conductors, IEEE Std 738-1993, approved Jun. 17, 1993, Cover p.-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.
Olsen, et al., A New Method for Real-Time Monitoring of High-Voltage Transmission-Line Conductor Sag, IEEE Transactions on Power Delivery, Oct. 2002, pp. 1142-1152, vol. 17, No. 4.
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.
The Aluminum Association, “Aluminum Electrical Conductor Handbook”, p. 3-10, New York, 1971.
A.K. Deb, “Powerline Ampacity System - Theory, Modeling, and Applications”, pp. 27-59, CRC Press, 2000.
EDM International, Inc., “Introducing the Sagometer”, brochure, Aug. 2002.
Chris Mensah-Bonsu, “Instrumentation and Measurement of Overhead Conductor Sag using the Differential Global Positioning Satellite System”, PhD Thesis, Arizona State University, Tempe, Arizona, Aug. 2000.
Grightmire Alan R.
Julian Danny
Nuqui Reynaldo F.
Scholtz Ernst
ABB Research Ltd.
Charioui Mohamed
Driggs, Hogg, Daugherty & DelZoppo Co., L.P.A.
Katterle Paul R.
Raymond Edward
LandOfFree
Real-time power-line sag monitoring using time-synchronized... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Real-time power-line sag monitoring using time-synchronized..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Real-time power-line sag monitoring using time-synchronized... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4098118