变压器中性点智能接地装置的设计

Design of Transformer's Neutral Point Intelligent Grounding Device

为了克服目前地磁感应电流治理措施存在的使变压器中性点失去有效接地和智能化水平低的缺点,设计出变压器中性点智能接地装置。文中介绍了新装置的工作原理、系统构成、硬件电路和工作流程。该装置中使用霍尔电流互感器作为信号采集器,能够实时检测入侵变压器中性点的地磁感应电流的大小,在电流超过设置阈值时将电阻串联在变压器中性点回路,实现了治理装置的智能化,符合理想地磁感应电流治理措施的设计理念。

Aiming at overcoming the existing disadvantages which can make the transformer＇s neutral point loss of effective grounding and at low level of intelligence and in the GIC governance, the neutral point intelligent grounding device of transformer is designed. This paper introduces the working principle, system composition, hardware circuit, and the work flow of the new device. Holzer current transformer used as the signal collector in the device, it can real-time control the size of GIC which invade the neutral point of transformer. When the current exceeds a set threshold, the device will serialized the resistance in the transformer＇s neutral point loop, which realizes the intellectualized control. Thus fit the ideal GIC governance design concept as well.