| 摘要: |
| 超导聚变装置需要超导磁体提供快速交变电流，运行过程中超导磁体需要承受一定高电压，可能导致超导磁体绝缘损坏，因此需要可靠的在线绝缘监控系统发现超导磁体早期绝缘退化点。本文使用局部放电法作为在线绝缘监测的方法，并使用高频电流法实现局部放电检测。超导磁体失超检测信号线直接连接在超导磁体上，满足高频电流法用于局放监测的应用条件。现行思路是利用高频电流传感器通过套在失超探测线上获取磁体的运行时的信号数据，生成PRPD图、等效时频图，分离装置运行噪声，初步提取有效局放信号。后续开展超导磁体绝缘的绝缘机理研究以及超导磁体样件绝缘破坏实验进一步提取局放信号为实现在线绝缘监控系统作为支持。 |
| 关键词: 高频电流传感器 局部放电 绝缘监测 等效时频图 |
| DOI： |
| 投稿时间：2024-03-06修订日期：2024-04-12 |
| 基金项目:国家重大科学工程 EAST装置失超诊断系统(075ETYF) 、CRAFT-中心螺管模型线圈(CSMC)磁体(CR106002)、局部放电对超导磁体绝缘影响机理研究(E25F0GAB131) |
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| Preliminary Design and Experiment of High Frequency Current Sensor for Insulation Monitoring of Superconducting Magnets |
|
liuhuaichao, xiaoyezheng
|
| (Institute of Plasma Physics Chinese Academy Of Scieneces) |
| Abstract: |
| Superconducting fusion devices require superconducting magnets to provide fast alternating current.During operation,superconducting magnets need to withstand a certain high voltage,which may cause insulation damage to the superconducting magnets.Therefore,a reliable online insulation monitoring system is needed to detect early insulation degradation points of superconducting magnets.This article uses the partial discharge method as an online insulation monitoring method, and uses the high-frequency current method to achieve partial discharge detection.The superconducting magnet quench detection signal line is directly connected to the superconducting magnet, which meets the application conditions of high-frequency current method for partial discharge monitoring.The current idea is that using a high-frequency current sensor to obtain the signal data of the magnet during operation by putting it on the quench detection line,generating a PRPD diagram and an equivalent time-frequency diagram,separating the operating noise of the device,preliminarily extracting effective partial discharge signals.Subsequent research on the insulation mechanism of superconducting magnet insulation and insulation damage experiments on superconducting magnet samples will further extract partial discharge signals to support the implementation of an online insulation monitoring system. |
| Key words: High frequency current sensor,Partial discharge,Insulation monitoring,Equivalent time-frequency diagram |