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首页> 外文期刊>Quality Control, Transactions >Electrical and Mechanical Condition Assessment of Low Voltage Unshielded Nuclear Power Cables Under Simultaneous Thermal and Mechanical Stresses: Application of Non-Destructive Test Techniques
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Electrical and Mechanical Condition Assessment of Low Voltage Unshielded Nuclear Power Cables Under Simultaneous Thermal and Mechanical Stresses: Application of Non-Destructive Test Techniques

机译：低压非屏蔽核电电缆的电气和机械条件评估在同时热和机械应力下的应用：非破坏性测试技术的应用

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摘要

Low voltage cables play a crucial role in the safe and reliable operation of nuclear power plants. This paper discusses the effect of simultaneous combined thermal and mechanical stresses on the overall insulation of unshielded low voltage power cables used in nuclear power plants. Cable samples based on XLPE/CSPE insulation were exposed to thermal-mechanical combined accelerated aging tests for an extended period lasted to 907 hours. Time and frequency domain dielectric spectroscopy were applied to reveal the degradation level of the core insulation and jacket due to combined stresses. The former technique was conducted through the measurement of the decay and return voltage slopes, while the latter technique was based on the measurement of the complex permittivity. Moreover, the mechanical properties of the cable insulation were investigated by applying the measurement of the Shore D hardness. The results showed that the combined aging affects both the electrical and mechanical properties of the overall insulation. The complex permittivity at 100 Hz, the decay voltage slope, and the hardness had an upward trend with aging, while the return voltage slope showed an inverse trend. In addition, the results of the electrical and mechanical measurements showed strong correlation with aging time and further correlation was observed between the dielectric and mechanical properties. The correlation between aging time and test results suggests that the presented test methods are promising tools for in situ condition monitoring of low voltage unshielded cables in nuclear power plants.
机译：低压电缆在核电站的安全可靠运行中起着至关重要的作用。本文讨论了同步组合热和机械应力对核电站使用的非屏蔽低压电力电缆整体绝缘的影响。基于XLPE / CSPE绝缘的电缆样品暴露于热机械联合加速老化试验，延长至907小时。应用时间和频率域介电光谱，以显示由于组合应力引起的芯绝缘和夹套的降解水平。通过测量衰减和返回电压斜率进行前一种技术，而后一种技术是基于复杂介电常数的测量。此外，通过应用肖氏D硬度的测量来研究电缆绝缘的机械性能。结果表明，合并的老化会影响整体绝缘的电气和力学性能。 100 Hz的复杂介电常数，衰减电压斜率和硬度具有衰老的向上趋势，而返回电压斜率显示出反向趋势。另外，电气和机械测量的结果表明与老化时间有强相关，并且在电介质和机械性能之间观察到进一步的相关性。老化时间和测试结果之间的相关性表明，所呈现的测试方法是在核电站中低压非屏蔽电缆的原位监测的有前途的工具。

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