低压电涌保护器的有效保护距离实验及结果观察  

Effective protection distance experiment and result observation of low voltage surge protector

作　　者：段弢[1] 涂山山 李鑫[1] DUAN Tao;TU Shan shan;LI Xin(Hubei Lightning Protection Center,Wuhan 430074,China)

机构地区：[1]湖北省防雷中心,湖北武汉430074

出　　处：《电子设计工程》2020年第4期47-51,共5页Electronic Design Engineering

基　　金：2019年度湖北省防雷中心科研基金项目(FL-Y-2019006)。

摘　　要：基于有效降低建筑物电子设备干扰,通过低压电涌保护器设计,分析有效保护距离,使建筑物电子设备干扰降低。首先,利用试验方法,分析单个低压电涌保护器(SPD)的保护性。之后,制定电容保护器参数条件,在此过程中,通过对负载性质、同种负载阻抗大小及电涌保护器和被保护设备电缆长度的改变,得到浪涌保护器有效保护距离。最后,对设计方案进行实现。通过实验结果表示,对实验过程中所出现的负载电压振荡情况,是由于负载阻抗和电缆阻抗不匹配导致电压波在电缆中出现折反射,还是因为负载和电缆阻抗谐振导致可的,所以抬高了长距离电缆后端设备电压,导致低压电涌保护器失效。利用分析表示,得到不同负载和有效保护距离的关系。Based on the effective reduction of building electronic equipment interference,through the design of low-voltage surge protector,the effective protection distance is analyzed to reduce the interference of building electronic equipment. Firstly,the protection of a single low voltage surge protector(SPD)is analyzed by using the test method. Then,the parameters of the capacitive protector are formulated. In this process,the effective protection distance of the surge protector is obtained by changing the load nature,the same load impedance and the cable length of the surge protector and the protected equipment. Finally,the design scheme is realized. The experimental results show that the load voltage oscillation during the experiment is caused by the mismatch of load impedance and cable impedance,which leads to the catadioptric reflection of voltage wave in the cable,or by the resonance of load and cable impedance. Therefore,the voltage of the back-end equipment of long-distance cable is raised,which leads to the failure of low-voltage surge protector. The relationship between different loads and effective protection distance is obtained by analysis.

关 键 词：低压电源 电涌保护器 保护距离 电子干扰 

分 类 号：TP[自动化与计算机技术]