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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29524


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16070
A Study on the Condition Monitoring of Transmission Line by On-line Circuit Parameter Measurement
Abstract:
An on-line condition monitoring method for transmission line is proposed using electrical circuit theory and IT technology in this paper. It is reasonable that the circuit parameters such as resistance (R), inductance (L), conductance (g) and capacitance (C) of a transmission line expose the electrical conditions and physical state of the line. Those parameters can be calculated from the linear equation composed of voltages and currents measured by synchro-phasor measurement technique at both end of the line. A set of linear voltage drop equations containing four terminal constants (A, B ,C ,D ) are mathematical models of the transmission line circuits. At least two sets of those linear equations are established from different operation condition of the line, they may mathematically yield those circuit parameters of the line. The conditions of line connectivity including state of connecting parts or contacting parts of the switching device may be monitored by resistance variations during operation. The insulation conditions of the line can be monitored by conductance (g) and capacitance(C) measurements. Together with other condition monitoring devices such as partial discharge, sensors and visual sensing device etc.,they may give useful information to monitor out any incipient symptoms of faults. The prototype of hardware system has been developed and tested through laboratory level simulated transmission lines. The test has shown enough evident to put the proposed method to practical uses.
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References:


[1] Gill Young Song, AdvancedEngineering of Power Transmission and Distribution: Dong-il Publish, 1999, p.192-197.
[2] Lewis Blackburn J. Symmetrical Components for Power Systems Engineering: New York, Marcel Dekker. 1976, p 295-321.
[3] Il Dong Kim and Raj K. Aggarwal, “A Study on the On-line Measurement of Transmission Line Impedances for Improved Relaying Protection,” Electrical Power & Energy Systems, 28(2006), pp.359-366,2006.
[4] Kreyszig Erwin. Advanced Engineering Mathematics: 7th Ed. New York; 1993 Wiley (Chapter 18).

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