Characteristic Impedance Modeling of Nuclear Power Instrumentation and Control Cable Shield Breakage

Hua Tu, Chao Peng, Yanyi Chen, Lixing Li, Honglei Deng and Gang Liu ()
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Hua Tu: Suzhou Nuclear Power Research Institute Co., Ltd., National Engineering Research Center for Nuclear Power Plant Safety and Reliability, Suzhou 215004, China
Chao Peng: Daya Bay Nuclear Power Operations and Management Co., Ltd., Shenzhen 518124, China
Yanyi Chen: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Lixing Li: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Honglei Deng: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
Gang Liu: School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China

Energies, 2025, vol. 18, issue 12, 1-19

Abstract: Nuclear Instrumentation and Control (I&C) cables laying in a complex environment are prone to shield damage. And, the traveling wave reflection method can be used to detect and locate damage using the characteristic impedance change caused by I&C cable damage. Therefore, this paper establishes a quasi-coaxial cable shield characteristic impedance calculation model. And, it brings in the defective circumferential angle of the damage coefficient. Then, it builds a quasi-coaxial I&C characteristic impedance model approximation of the multi-core cable structure combined. Finally, the results of this paper through calculations and simulations are as follows. Firstly, the characteristic impedance of the cable with eccentricity e equal to 2.57 mm is stabilized at 37.795 Ω with increasing frequency. Second, the difference in the computational model is 3.88 Ω at 10 MHz of frequency, and a less than 3% difference in model approximation of a four-core cable at 5 MHz of frequency. Third, the calculation model can control the error of the characteristic impedance calculation result within 4 Ω within the defect angle of 270°. These results validate the reasonableness of the model.

Keywords: instrumentation and control cable; characteristic impedance modeling; cable shield breakage; multi-core cables; breakage factor; quasi-coaxial model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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