Department of Electrical Engineering, 100 Inha-ro, Michuhol-gu, Inha University, Incheon 22212, Korea.
Sungjin Techwin Co., Ltd., 62, Yuseong-daero 877 beon-gil, Yuseong-gu, Daejeon 34127, Korea.
Sensors (Basel). 2020 Apr 18;20(8):2310. doi: 10.3390/s20082310.
In this study, a low-cost surge current detection sensor (SCDS) that can measure high current surges using a low-current toroidal coil is proposed for maintenance of a surge protective device (SPD). The proposed SCDS is designed to display the predicted lifetime of the SPD based on the magnitude of surge current and number of surges. In addition, a method for measuring high surge current using a toroidal coil that can usually measure only low current is proposed. A lightning strike counter consists of a microcontroller with a low-power liquid crystal display (LCD) driver, 3 VDC lithium battery, and signal conditioning circuit that converts amplitude information of the surge current into duration information of a negative pulse to facilitate processing in the microcontroller. In this paper, we propose a software algorithm that can calculate the remaining lifetime of SPD based on the amplitude and number of surge currents. There is also an option to select the capacity of the surge protective device and the number of phase lines, allowing it to assess the predicted lifetime for various types of Class II SPDs. The proposed SCDS is measured as 7.2 μA from the battery power consumption test, and the service life is calculated to be 11.1 years. It meets the International Standard IEC62561-6 test conditions of the lightning strike counter and is expected to be useful in the maintenance of SPDs and lightning protection systems.
在这项研究中，提出了一种低成本浪涌电流检测传感器（SCDS），该传感器可使用小电流环形线圈测量大电流浪涌。所提出的 SCDS 旨在根据浪涌电流的大小和浪涌次数来显示 SPD 的预测寿命。此外，还提出了一种使用环形线圈测量高浪涌电流的方法，该方法通常只能测量小电流。雷击计数器由带有低功率液晶显示器（LCD）驱动器的微控制器、3 VDC 锂电池以及信号调理电路组成，该信号调理电路将浪涌电流的幅度信息转换为负脉冲的持续时间信息，便于在微控制器中进行处理。在本文中，我们提出了一种软件算法，该算法可以根据浪涌电流的幅度和数量来计算 SPD 的剩余寿命。还可以选择浪涌保护装置的容量和相线数量，从而可以评估各种类型的 II 级 SPD 的预测寿命。所提出的 SCDS 的电池功耗测试结果为 7.2 μA，使用寿命计算为 11.1 年。它满足雷击计数器的国际标准 IEC62561-6 测试条件，有望在 SPD 和防雷系统的维护中发挥作用。
