Thermal Distortion of Signal Propagation Modes Due to Dynamic Loading in Medium-Voltage Cables

Autor: Armand van Deursen, P.A.A.F. Wouters
Přispěvatelé: Electrical Energy Systems, EIRES System Integration, Intelligent Energy Systems
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Electromagnetic field
Control and Optimization
Materials science
Admittance
020209 energy
multi-conductor transmission lines
Energy Engineering and Power Technology
02 engineering and technology
lcsh:Technology
01 natural sciences
Signal
Characteristic impedance
Operating temperature
Distortion
0103 physical sciences
0202 electrical engineering
electronic engineering
information engineering
dynamic cable rating
Time domain
SDG 7 - Affordable and Clean Energy
Electrical and Electronic Engineering
signal propagation modes
Engineering (miscellaneous)
010302 applied physics
power cable insulation
lcsh:T
Renewable Energy
Sustainability and the Environment
complex dielectric permittivity
Mechanics
Dynamic loading
Multi‐conductor transmission lines
SDG 7 – Betaalbare en schone energie
Energy (miscellaneous)
Zdroj: Energies
Volume 13
Issue 17
Energies, Vol 13, Iss 4436, p 4436 (2020)
Energies, 13(17):4436. Multidisciplinary Digital Publishing Institute (MDPI)
ISSN: 1996-1073
DOI: 10.3390/en13174436
Popis: Temperature variation from dynamic cable loading affects the propagation characteristics of transient signals. The distortion of modal signal components as a function of temperature in a three-phase medium-voltage cable is investigated. The temperature influence arises mainly through the complex insulation permittivity, which has a non-linear relationship with temperature. Near the maximum operating temperature of the cross-linked polyethylene insulation, the propagation velocity increases by 0.56% per degree centigrade but is an order of magnitude less sensitive at ambient temperature. The paper presents modeling results based on cable impedance and admittance matrices obtained from electromagnetic field simulation, taking into account the time-varying temperature distribution in the cable cross-section. The results are verified by applying Rayleigh&ndash
Schrö
dinger perturbation analysis. In the time domain, signal patterns shift when the modal propagation velocities change upon cable loading. Moreover, separation of degenerate modes is observed when the cable phase conductors carry an unbalanced current. The perspectives for exploiting the temperature dependency of signal propagation for pinpointing cable defects and for dynamic rating of underground power cables are discussed.
Databáze: OpenAIRE
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