捷克技术大学的电物理学家提供了其他证据，表明新电流传感器在通过铁导体评估电流时会引入错误。在新传感器中纠正该缺陷至关重要，以便电网的操作员可以正确响应对系统的威胁。研究人员展示了导体的磁渗透性的差异，磁场中物质磁化响应的程度如何影响新传感器的精度。他们还提供了提高传感器准确性的建议。结果在本周发布AIP进步, from AIP Publishing.
添加新的再保险newable energy sources and smart homes demanding more information, the electrical grid is becoming more complex. Author Pavel Ripka said, “If you have [a] grid at the edge of capacity, you have to be careful to monitor all the transients (power surges).” Surges are overloads or failures to the system, which can be caused by something as simple as a broken power line, or more dramatic events like lightning strikes or geomagnetic storms.
Ripka explained the importance of monitoring electrical currents: “Every day you get a lot of these small events (surges) within a big power grid, and sometimes it is difficult to interpret them. If it is something really serious, you should switch off parts of the grid to prevent catastrophic damage, but if it’s a short transient which will finish fast there is no need to disconnect the grid. It’s a risky business to distinguish between these events, because if you underestimate the danger then parts of the distribution installations can be damaged causing serious blackouts. But if you overestimate and disconnect, it is a problem because connecting these grids back together is quite complicated,” he said.
To address the increasing complexity of the grid and power outage threats, there has been an increase in use of ground current sensors in the past couple of years. New yokeless current sensors are popular because of their low cost and compact size. These sensors are good for assessing currents in nonmagnetic conductors such as copper and aluminum. However, ground conductors are usually iron due to its mechanical strength, and iron has a high magnetic permeability.
使用这些新的传感器在存在时测量地面电流有点像使用温度计评估是否需要打开加热，而不是考虑到何处放置温度计。在门或窗口附近，温度计的读数可能与其他地方不同。以同样的方式，这项研究表明，不考虑导体的磁渗透性会扭曲使用无用传感器的读数的准确性。
Ripka和他的团队将实验测量与理论模拟相匹配，以突出非磁导体和磁导体之间无Yokeless传感器读数的差异。
Ripka说：“我们可以展示如何设计（无用）当前传感器，以使它们不太容易受到这种错误的影响。”“ [这项研究]只是一个小的提醒，可以安全地制造[工程师]设计传感器。”
为了进一步证明这一点，Ripka的小组开始在电站进行长期读数，将结果与商业未校准的传感器进行比较。将来，Ripka设想与地球物理学家合作以将地面电流和地磁活动相关联，以更好地了解这些电流如何分布在地球内，甚至预测未来对网格的破坏。
This work was supported by the Grant Agency of the Czech Republic through the project “New methods for the measurement of electric currents” (GACR 17-19877S).
Filed Under:Infrastructure
