On-line monitoring of OHL conductor temperature; live-line installation

Gal, S.; Oltean, Marius; Brabete, Lucian; Rodean, Ioan; Opincaru, Mircea

doi:10.1109/tdcllm.2011.6042240

Cited by 11 publications

(3 citation statements)

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“…They are installed directly on the overhead line conductors and measure current electric parameters, i.e. the current values of voltage and current in the wire, together with other non-electric parameters, such as the surface temperature of the conductor [20,21,23], its expansion, stress or the conductor sag angle relative to the plumb line [22]. The mentioned measurement data, especially those of the wire temperature, make possible monitoring the current condition of line conductors and performing their controlled overloading in given weather conditions.…”

Section: Dynamic Line Rating Systems Taking Into Account Wire Temperamentioning

confidence: 99%

Power System State Estimation Accuracy Enhancement Using Temperature Measurements of Overhead Line Conductors

Wydra

Kacejko

2016

Metrology and Measurement Systems

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Power system state estimation is a process of real-time online modeling of an electric power system. The estimation is performed with the application of a static model of the system and current measurements of electrical quantities that are encumbered with an error. Usually, a model of the estimated system is also encumbered with an uncertainty, especially power line resistances that depend on the temperature of conductors. At present, a considerable development of technologies for dynamic power line rating can be observed. Typically, devices for dynamic line rating are installed directly on the conductors and measure basic electric parameters such as the current and voltage as well as non-electric ones as the surface temperature of conductors, their expansion, stress or the conductor sag angle relative to the plumb line. The objective of this paper is to present a method for power system state estimation that uses temperature measurements of overhead line conductors as supplementary measurements that enhance the model quality and thereby the estimation accuracy. Power system state estimation is presented together with a method of using the temperature measurements of power line conductors for updating the static power system model in the state estimation process. The results obtained with that method have been analyzed based on the estimation calculations performed for an example system − with and without taking into account the conductor temperature measurements. The final part of the article includes conclusions and suggestions for the further research.

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Section: Dynamic Line Rating Systems Taking Into Account Wire Temperamentioning

confidence: 99%

Power System State Estimation Accuracy Enhancement Using Temperature Measurements of Overhead Line Conductors

Wydra

Kacejko

2016

Metrology and Measurement Systems

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“…The economic value of maximizing ampacity has led to research into several techniques for the measurement of overhead line temperature. One option for monitoring overhead transmission line temperature uses surface acoustic wave (SAW) sensors [5][6][7][8]10]. When a sensor is in mechanical contact with the transmission line, the temperature of the transmission line can be estimated from the sensor temperature.…”

Section: Introductionmentioning

confidence: 99%

“…The temperature of the sensor can be measured using pulse echo techniques [7]. It has been reported in the technical data of one of these systems that a sensor measurement accuracy of ±1 • C can be achieved for a conductor temperature range from −35 to 150 • C, with a calculated conductor accuracy of ±3 • C at a nominal conductor temperature (temperature range: −35 to +150 • C) [6]. However, SAW devices have high insertion losses (20-60 dB) [9] and therefore have a shorter range, at the same transmitted power, than the RF cavity sensor reported in this work.…”

Section: Introductionmentioning

confidence: 99%

Wireless overhead line temperature sensor based on RF cavity resonance

Ghafourian¹,

Bridges²,

Nezhad³

et al. 2013

Smart Mater. Struct.

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The importance of maximizing power transfer through overhead transmission lines necessitates the use of dynamic power control to keep transmission line temperatures within acceptable limits. Excessive conductor operating temperatures lead to an increased sag of the transmission line conductor and may reduce their expected life. In this paper, a passive wireless sensor based on a resonant radio frequency (RF) cavity is presented which can be used to measure overhead transmission line temperature. The temperature sensor does not require a power supply and can be easily clamped to the power line with an antenna attached. Changing temperature causes a change of cavity dimensions and a shift in resonant frequency. The resonant frequency of the cavity can be interrogated wirelessly. This temperature sensor has a resolution of 0.07 • C and can be interrogated from distances greater than 4.5 m. The sensor has a deviation from linearity of less than 2 • C.

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Review of dynamic line rating systems for wind power integration

Fernández

Albizu

Bedialauneta

et al. 2016

Renewable and Sustainable Energy Reviews

121

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When a wind power system is connected to a network point there is a limit of power generation based on the characteristics of the network and the loads connected to it. Traditionally, transmission line limits are estimated conservatively assuming unfavourable weather conditions (high ambient temperature, full sun and low wind speed). However, the transmission capacity of an overhead line increases when wind speed is high, due to the cooling caused by wind in the distribution lines. Dynamic line rating (DLR) systems allow monitoring real weather conditions and calculating the real capacity of lines. Thus, when planning wind power integration, if dynamic line limits are considered instead of the conservative and static limits, estimated capacity increases. This article reviews all technologies developed for real-time monitoring during the last thirty years, as well as some case studies around the world, and brings out the benefits and technical limitations of employing dynamic line rating on overhead lines. Further, the use of these DLR systems in wind integration is reviewed.

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On-line monitoring of OHL conductor temperature; live-line installation

Cited by 11 publications

References 0 publications

Power System State Estimation Accuracy Enhancement Using Temperature Measurements of Overhead Line Conductors

Power System State Estimation Accuracy Enhancement Using Temperature Measurements of Overhead Line Conductors

Wireless overhead line temperature sensor based on RF cavity resonance

Review of dynamic line rating systems for wind power integration

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