Analysis of formulas to calculate the AC resistance of different conductors’ configurations

Riba, Jordi-Roger

doi:10.1016/j.epsr.2015.05.023

Cited by 39 publications

(29 citation statements)

References 21 publications

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“…Using approximate analytical expressions-e.g., various approximate formulas for alternating current resistance can be found in [11][12][13] and approximations for inductances are given in [14]; integral equation with current density approximated with finite power series was proposed in [15,16]; multipole expansion with finite number of terms was used in [17].…”

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confidence: 99%

Analytical–Numerical Solution for the Skin and Proximity Effects in Two Parallel Round Conductors

et al. 2019

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This paper describes an analytical-numerical method for the skin and proximity effects in a system of two parallel conductors of circular cross section—a system very frequently encountered in various applications. The magnetic field generated by the current applied on each conductor is expressed by means of vector magnetic potential and expanded into Fourier series. Using the Laplace and Helmholtz equations, as well as the classical boundary conditions, the current density induced due to the proximity and skin effect is determined in each conductor. The resulting current density is expressed as a series of successive reactions. The results obtained are compared with those obtained via finite elements. Although the paper is theoretical, the considered problem has a practical significance, because transmission lines with round conductors are universally used. Besides, the results can be used to estimate errors when only the first reaction is taken into account, which gives relatively simple formulas.

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confidence: 99%

Analytical–Numerical Solution for the Skin and Proximity Effects in Two Parallel Round Conductors

et al. 2019

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“…It is well known that the DC and AC resistance can be different, due to the skin and proximity effects [16]. However, due to the specific geometry analyzed in this work, such effects, although not null, are almost negligible [17] [18].…”

Section: DC Resistance Measurementmentioning

confidence: 96%

On-line Resistance Measurement of Substation Connectors Focused on Predictive Maintenance

Kadechkar

Riba

Moreno-Eguilaz

et al. 2018

2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)

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ús personal d'aquest material. S'ha de demanar permís a l'IEEE per a qualsevol altre ús, incloent la reimpressió/reedició amb fins publicitaris o promocionals, la creació de noves obres col·lectives per a la revenda o redistribució en servidors o llistes o la reutilització de parts d'aquest treball amb drets d'autor en altres treballs.Abstract-To detect faults in their early stage in a substation, it is necessary to monitor, measure and analyze periodically the health condition of the electrical connectors, which are among the most critical devices in such installations. To do so, the electrical connector has to be combined with low-cost intelligent electronic devices (IED), including different sensor types and microcontrollers with wireless capabilities. Such an electrical connector is referred as SmartConnector. Using the data collected by the IED, it is possible to estimate accurately the current condition of the electrical connector in real-time, which in turn will determine the expected faults in the substation before a major failure occurrence. The electrical resistance plays a key role to determine the current health condition, and therefore to estimate the remaining lifetime of the electrical connector. The electrical resistance of a high-voltage substation connector is calculated in real-time using different methods proposed in this work, by using an analog-bipolar Hall effect sensor and an instrumentation amplifier. Experimental results, when compared with the standard 4-wire Kelvin method, show an error of less than 10%. Although the proposed methods have been validated for substation connectors, they can be applied to many other types of hardware with electrical contacts. I.978-1-5386-4198-9/18/$31.00 ©2018 IEEE

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“…It is a recognized fact that the AC resistance can be significantly different from the DC resistance due to the effect of eddy currents, which produce an uneven distribution of the current density across the crosssection of the connector. In the analyzed case, the skin effect predominates over the proximity effect, although the latter one can be important under the presence of nearby conductors and connectors [37]. This paper proposes determining the k = R Connector.AC /R Connector.DC ratio by applying FEM simulations.…”

Section: B Contact Resistance Measurement Under Ac Supplymentioning

confidence: 99%

Low-Cost Online Contact Resistance Measurement of Power Connectors to Ease Predictive Maintenance

Kadechkar

Moreno-Eguilaz

Riba

et al. 2019

IEEE Trans. Instrum. Meas.

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With the increasing use of sensors and wireless communication systems, predictive maintenance is acquiring more and more importance to assess the condition of in-service equipment. Predictive maintenance presents promising cost savings, as it allows minimizing unscheduled power systems faults, which can have very costly and catastrophic consequences. Early stage detection of power system failure requires acquiring, monitoring, and periodically analyzing the condition of the elements involved, such as high-voltage power connectors, since they are critical devices which are often located in key points of power systems. This paper proposes a low-cost online system to determine the contact resistance of high-voltage direct current (DC) and alternating current (AC) power connectors, to determine their health condition in order to apply a predictive maintenance plan. The contact resistance is considered as a reliable indicator of connector's health condition. However, it cannot be directly measured, and the applied strategy differs between DC and AC power systems. Experimental results show a maximum error of 5%, thus proving the accuracy and feasibility of the approach presented in this paper, since the proposed limit of acceptable resistance increase is 20%. This approach can also be applied to many other power systems' elements.

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Analysis of formulas to calculate the AC resistance of different conductors’ configurations

Cited by 39 publications

References 21 publications

Analytical–Numerical Solution for the Skin and Proximity Effects in Two Parallel Round Conductors

Analytical–Numerical Solution for the Skin and Proximity Effects in Two Parallel Round Conductors

On-line Resistance Measurement of Substation Connectors Focused on Predictive Maintenance

Low-Cost Online Contact Resistance Measurement of Power Connectors to Ease Predictive Maintenance

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