Electrical characteristics of steel-cored aluminium conductors

Morgan, V.T.

doi:10.1049/piee.1965.0051

Cited by 26 publications

(10 citation statements)

References 3 publications

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“…The TCR of the device can be obtained by measuring the resistance variation with the increased temperature range from 25 °C to 100 °C. As shown in Figure 5c, the TCR of the device obtained from the fitting curve is about 2.136 × 10 −3 /°C, which is lower than the theoretical value of the Al wire (3.93 × 10 −3 ~4.10 × 10 −3 /°C) [32]. This may be due to the fact that the temperature control of the test system was not ideal during the test, so the actual temperature of the Al conductive filament was lower than the ambient temperature.…”

Section: Resultsmentioning

confidence: 99%

Flexible Polymer Device Based on Parylene-C with Memory and Temperature Sensing Functionalities

et al. 2017

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Polychloro-para-xylylene (parylene-C) is a flexible and transparent polymer material which has excellent chemical stability and high biocompatibility. Here we demonstrate a polymer device based on single-component parylene-C with memory and temperature sensing functionalities. The device shows stable bipolar resistive switching behavior, remarkable storage window (>10 4 ), and low operation voltages, exhibiting great potential for flexible resistive random-access memory (RRAM) applications. The I-V curves and conductive atomic force microscopy (CAFM) results verify the metallic filamentary-type switching mechanism based on the formation and dissolution of a metal bridge related to the redox reaction of the active metal electrode. In addition, due to the metallic properties of the low-resistance state (LRS) in the polymer device, the resistance in the LRS exhibits a nearly linear relationship at the temperature regime between 25 • C and 100 • C. With a temperature coefficient of resistance (TCR) of 2.136 × 10 −3 / • C, the device is also promising for the flexible temperature sensor applications.

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Section: Resultsmentioning

confidence: 99%

Flexible Polymer Device Based on Parylene-C with Memory and Temperature Sensing Functionalities

et al. 2017

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“…The ac resistance of the conductor R ac includes the skin and proximity effects as well as the core losses, which can be calculated according to the method detailed in the Cigré Technical Brochure [35], or it can be measured. Measurements can be conducted according to the procedure described in [36] or in [31], with the last method being applied in this paper, a decision that is based on the previous experience of the authors.…”

Section: Dynamic Thermal Line Rating Estimation Methodsmentioning

confidence: 99%

Analysis of a Smart Sensor Based Solution for Smart Grids Real-Time Dynamic Thermal Line Rating

Liu

Riba

Moreno-Eguilaz

et al. 2021

Sensors

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Dynamic thermal line rating (DTLR) allows us to take advantage of the maximum transmission capacity of power lines, which is an imperious need for future smart grids. This paper proposes a real-time method to determine the DTLR rating of aluminum conductor steel-reinforced (ACSR) conductors. The proposed approach requires a thermal model of the line to determine the real-time values of the solar radiation and the ambient temperature, which can be obtained from weather stations placed near the analyzed conductors as well as the temperature and the current of the conductor, which can be measured directly with a Smartconductor and can be transmitted wirelessly to a nearby gateway. Real-time weather and overhead line data monitoring and the calculation of DTLR ratings based on models of the power line is a practical smart grid application. Since it is known that the wind speed exhibits important fluctuations, even in nearby areas, and since it plays a key role in determining the DTLR, it is essential to accurately estimate this parameter at the conductor’s location. This paper presents a method to estimate the wind speed and the DTLR rating of the analyzed conductor. Experimental tests have been conducted to validate the accuracy of the proposed approach using ACSR conductors.

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“…15 The core acts as a heat sink, 16 tending to decrease the rate of heating of the conducting section of the conductor, as shown in Appendix 8.2.1. With Newtonian heat transfer, i.e.…”

Section: Conductor With Electrically Nonconducting Corementioning

confidence: 99%

Rating of bare overhead conductors for intermittent and cyclic currents

Morgan

1969

Proc. Inst. Electr. Eng. UK

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Equations are derived and solutions given for determining the variation with time of the temperature of bare overhead conductors carrying intermittent and cyclic currents. The temperature variation depends on the rate of heat input, the heat capacity of the conductor and the rate of total heat transfer. The latter is proportional to (temperature rise) 9 . If the heat transfer by radiation can be neglected, q = 1 for forced convection and approximately 1 • 25 for natural convection. If radiation is not negligible, q is greater than 1, the actual value being obtained from calculations or steady-state measurements. Thermal time constants can only be used when q = 1, and they are then only approximations. Measured heating-and cooling-time constants agree reasonably well with calculated values. The significance of the difference between heating-and cooling-time constants is discussed. f The importance of the heat source or sink formed by the core in steel-cored conductors is shown, and calculated values of the radial thermal conductivity are similar to those found from previous steady-state measurements. Calculated temperature/time characteristics for conductors in still air are in good agreement with measured characteristics. List of symbolsa = thermal diffusivity, m 2 /s c = specific heat capacity at constant pressure, J/kgdegC C = heat capacity per unit length, J/mdegC D = diameter of the circle circumscribing the conductor, m e = base of natural logarithm h = total heat-transfer coefficient, W/m 2 degC H = specific total heat-transfer coefficient, W/mdegC / = current, A J = current density, A/m 2 k = factor to allow for the increase of resistance due to skin effect, proximity, hysteresis and eddy currents / = length, m m = mass per unit length, kg/m n = integer p s = solar irradiance at conductor surface, W/m 2 P = power gain per unit length by Joule heating, W/m p s = power gain per unit length by solar irradiation, W/m P T = total power gain per unit length, W/m q = heat-transfer exponent r = radius, m R = d.c. resistance per unit length, Q/m / = time, s V = potential difference, V a = temperature coefficient of resistance, degC" 1 /3 = temperature coefficient of specific heat capacity, degC" 1 y = specific mass, kg/m 3 A = effective radial thermal conductivity, W/mdegC 6 = temperature rise, degC p = resistivity, Qm T = thermal time constant, s

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Electrical characteristics of steel-cored aluminium conductors

Cited by 26 publications

References 3 publications

Flexible Polymer Device Based on Parylene-C with Memory and Temperature Sensing Functionalities

Flexible Polymer Device Based on Parylene-C with Memory and Temperature Sensing Functionalities

Analysis of a Smart Sensor Based Solution for Smart Grids Real-Time Dynamic Thermal Line Rating

Rating of bare overhead conductors for intermittent and cyclic currents

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