A thermal model for calculating axial temperature distribution of overhead conductor under laboratory conditions

Zhang, Xudong; Ying, Zhanfeng; Chen, Yuansheng; Chen, Xiong

doi:10.1016/j.epsr.2018.10.008

Cited by 9 publications

(3 citation statements)

References 24 publications

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“…At present, the commonly used conductor for transmission lines are aluminum conductor steel-reinforced (ACSR) [30], which consist of multiple twisted steel core and aluminum layers. In Figure 1, the existing temperature calculation models of overhead transmission lines mostly consider the entire conductor as an isothermal body or only considers the radial heat transfer path of the conductor cross-section, and each radial layer is regarded as an isothermal body [23,24,26,27]. However, different zones of the conductor cross-section are differently influenced by forced convective heat and radiation heat transfer in actual operations as demonstrated in Figure 2.…”

Section: Heat Transfer Analysis Of Overhead Transmission Line Cross-smentioning

confidence: 99%

“…So far, numerous studies have been conducted on conductor transient temperature calculation, which considers the structural characteristics of a conductor with several materials that can affect heat transfer [22][23][24][25][26][27][28]. For example, in [23][24][25], conductor temperature calculation model was established by thermal circuit model on the basis of thermal-electrical analogy theory.…”

Section: Introductionmentioning

confidence: 99%

“…By contrast, this model ignores the temperature-dependent properties of several conductor parameters during the dynamic thermal process. Radial or axial temperature calculation models in the form of state equation were established based on thermal equilibrium principle under the condition of constant environment temperature and constant humidity in [26][27][28]. Whereas, the radial and axial temperature distributions of a conductor were obtained under an ideal natural convective heat transfer condition, and the calculation methods demonstrate a remarkable precision.…”

Section: Introductionmentioning

confidence: 99%

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Transient Temperature Calculation and Multi-Parameter Thermal Protection of Overhead Transmission Lines Based on an Equivalent Thermal Network

Xiong

Chen

et al. 2018

Energies

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The overload degree of a transmission line is represented by currents in traditional overload protection, which cannot reflect its safety condition accurately. The sudden rise in transmission line current may lead to cascading tripping under traditional protection during power flow transfer in a power system. Therefore, timely and accurate analysis of the transient temperature rise of overhead transmission lines, revealing their overload endurance capability under the premise of ensuring safety, and coordination with power system controls can effectively eliminate overloading. This paper presents a transient temperature calculation method for overhead transmission lines based on an equivalent thermal network. This method can fully consider the temperature-dependent characteristics with material properties, convective heat resistance, and radiation heat and can accurately calculate the gradient distribution and response of the conductor cross-section temperature. The validity and accuracy of the proposed calculation method are verified by a test platform. In addition, a multi-parameter thermal protection strategy is proposed on the basis of the abovementioned calculation method. The protection can adequately explore the maximum overload capability of the line, and prevent from unnecessary tripping to avoid the expansion of accidents. Finally, the validity of the proposed protection is verified by the modified 29-bus system.

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Section: Heat Transfer Analysis Of Overhead Transmission Line Cross-smentioning

confidence: 99%