A wireless signal transmission technology based on acoustic carrier is proposed, which overcomes the limitation of electromagnetic signal shielding and shows great potential for in-site monitoring of sliding electrical contact used in gas-insulated switchgear (GIS)/gas-insulated transmission line (GIL). Here, the state parameter of the sliding electrical contact is modulated onto the frequency domain of an ultrasound wave. As a mechanical wave, the ultrasonic wave is immune to electromagnetic shielding, so that it could carry the sensing signal to penetrate the metal shielding layer and transmit to the external terminals of GIS/GIL. The principle and signal modulation process of the acoustic carrier based transmission system have been demonstrated in detail. Both simulation and experiment have been conducted to analyse the system characteristics as well as optimise the system configuration. As a proof-of-concept application, the in situ and on-line monitoring of the thermal rise of a slide electrical contact both in a current loading equivalent model and a prototype of GIS is demonstrated. Experimental results fit well with the physical process, and show a good measurement accuracy of 0.6% and temperature sensitivity of 400 Hz/°C.

中文翻译：

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声载波信号传输技术及其用于气体绝缘开关设备/气体绝缘输电线路滑动电接触现场监测的潜力

提出了一种基于声波载波的无线信号传输技术，克服了电磁信号屏蔽的限制，在气体绝缘开关设备（GIS）/气体绝缘输电线路（GIL）滑动电接触的现场监测方面显示出巨大的潜力。 ）。这里，滑动电接触的状态参数被调制到超声波的频域上。超声波作为一种机械波，不受电磁屏蔽的影响，可以携带传感信号穿透金属屏蔽层，传输到GIS/GIL的外部终端。详细论证了声波载波传输系统的原理和信号调制过程。通过仿真和实验来分析系统特性并优化系统配置。作为概念验证应用，演示了在电流负载等效模型和 GIS 原型中对滑动电触点热升的现场和在线监测。实验结果与物理过程吻合良好，测量精度为0.6%，温度灵敏度为400 Hz/°C。