远程雷电流监测系统的开发与实验

Development and Test of Remote Measuring System for Lightning Current

地闪雷电流波形的测量对于研究雷电特性以及雷电防护有着非常重要的意义,为测量地闪雷电流波形,介绍了一套远程雷电流监测系统的开发及其应用实验。测量使用自行研制的自积分式Rogowski电流探头测量雷电流信号,可测量雷电流幅值达50kA;以ARM处理器为核心的采集系统采样速率为40MHz,采样精度为12位,正负极性触发,存储容量达32MB,可一次性存储64次测量结果;信号传输使用光隔离传输系统,提高了系统的抗干扰能力;设计实现了系统数据的远程访问。针对整套测量系统进行的模拟实验和标定结果表明,整套系统的动态性能良好,满足雷电流测量的需要.

In order to perform long-term observation of lightning strikes, a novel remote measuring system for lightning current is developed. The system consists of a measurement probe, an analog data transmission system, a data acquisition system and an Ethernet communication system. A self-integrating Rogowski coil which can measure pulse current up to 50 kA is designed. Fiber-optic transmission system is used to transmit the measured signal to reduce the electromagnetic interference during measurement. A small size data acquisition equipment is designed based on ARM processor. Its sampling rate is 40 MHz with AD resolution of 12 bits, bipolar triggering. The memory depth reaches 32 M to store 64 typical events at one time. Remote accessing of the test data from Internet is realized. The overall size of the acquisition unit is only 220 mm 140 mm 60mm. To prove the ability of the developed system, simulation and calibration tests are carried out. 10/10us pulses are applied to the measurement system. Resuits show that the system can well reproduce the shape of the measured current. Electromagnetic noise is well removed after using the fiber optic transmission system. This system can be mounted to tall buildings and towers to observe lightning current in real fields.