Research of thermal protection characteristics for circuit breakers considering nonlinear electro-thermal-structural coupling

Shu, Liang; Guo, Liang; Wu, Guichu; Chen, Wei

doi:10.1016/j.applthermaleng.2019.02.068

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…However, there are still many deficiencies in many methods for monitoring the early condition of cables. Therefore, it is very significant to find convenient and effective methods for early fault condition monitoring [22]. This paper proposes a cable current-carrying status monitoring, analysis, and early fault warning method based on temperature information for cables and power equipment, which is of great significance for the safe operation of the power system.…”

Section: Methods Introductionmentioning

confidence: 99%

“…Currently, the heating problem of cable joints and arresters can be considered from two aspects. One is Joule heating generated by the energization of the current conductor, and the other is heat transfer by heat conduction [22]. In the simulation of electromagnetic heat, the interaction between electric and thermal fields should be fully considered.…”

Section: The Theoretical Basis Of the Temperature-current Dependence ...mentioning

confidence: 99%

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Cable current-carrying status analysis and early fault warning method based on temperature information

Yang

Zhang

et al. 2023

Meas. Sci. Technol.

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Long-term operation of cables and equipment under abnormal currents can cause insulation aging and reduce the service life of the equipment. Identifying the current-carrying status accurately and early detection of potential failures of power cables is particularly significant for ensuring the operation of power equipment safely and economically. This paper proposed a method for detecting the current-carrying status of power cables and an early fault warning based on temperature information. Based on the theoretical basis of the relationship between temperature and current. According to IEC 61000-3-7 and IEC 60038 standards, the current-carrying state evaluation method is analyzed and given, and the early fault warning model is established. Finally, the paper takes the cable connector and the lightning arrester in the power ring network cabinet as an example to verify the method's feasibility. It shows that the characteristic information of the relative temperature variation curves under different current carrying states significantly differs. Includes the slope of hour 9, the slope of hour 2, and the maximum. Then the total duration under abnormal current operation is calculated, and the early warning of faults can realize.

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Section: Methods Introductionmentioning

confidence: 99%

Section: The Theoretical Basis Of the Temperature-current Dependence ...mentioning

confidence: 99%

Cable current-carrying status analysis and early fault warning method based on temperature information

Yang

Zhang

et al. 2023

Meas. Sci. Technol.

View full text Add to dashboard Cite

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Advanced cooling channel structures for enhanced heat dissipation in aerospace

Xue,

Wang,

Yue

et al. 2024

Applied Thermal Engineering

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Research on temperature rise prediction model for circuit breaker based on numerical Laplace transform

Zhang,

et al. 2024

Eng. Res. Express

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The temperature rise in circuit breakers' thermal paths is a critical indicator influencing their tripping characteristics, directly affecting response speed, reliability, and safety. Existing models for predicting circuit breaker temperature rise are often structurally limited, lack generality, and exhibit low predictive accuracy. Addressing this issue, this paper investigates an efficient, precise, and widely applicable theoretical model for predicting circuit breaker temperature rise. This model focuses on the thermal conduction mechanisms within small-scale circuit breakers, establishing a fundamental numerical heat transfer model based on Newton's cooling formula and Fourier's heat conduction law. By applying numerical Laplace transformation, the model is simplified into the complex frequency domain, and employing residue theorem for solving, it is transformed back into the time domain using Laplace inverse transformation to derive the predictive model. Experimental validation using a 32A rated current circuit breaker demonstrates the model's high predictive accuracy, suitability across various circuit breaker structures, with an average deviation below the permissible deviation in industry standards. This research holds significant implications for enhancing the thermal tripping characteristics of circuit breakers.

show abstract

Research of thermal protection characteristics for circuit breakers considering nonlinear electro-thermal-structural coupling

Cited by 5 publications

References 22 publications

Cable current-carrying status analysis and early fault warning method based on temperature information

Cable current-carrying status analysis and early fault warning method based on temperature information

Advanced cooling channel structures for enhanced heat dissipation in aerospace

Research on temperature rise prediction model for circuit breaker based on numerical Laplace transform

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