雷电压及雷电流组合测量技术研究

在国内外．雷击事故严重威胁到电网的安全。对输电线路上雷电流和雷电压波形的测量系统进行研究，对电网防雷具有重要意义。研究了直接测量高压输电线路上雷电流和雷电压波形的组合测量传感器。其电流传感器采用自积分Rogowski圈；电压传感器采用自积分式电容分压器的原理，使用Rogowski圈的铝屏蔽壳作为高压臂电容的极板。8／20μs的标准雷电流和上升时间250rls的冲击电流试验表明，本文研制Rogowski线圈具有较好的频率响应特性和稳定的较小的灵敏度。冲击电压试验表明，所研制的电压传感器可较为准确地测量0．5／49μs和1．2／66μs冲击电压波形。该组合测量技术符合雷电测量要求。

Research on Combined Measurement Technology for Lightning Voltage and Lightning Current

Referring to the domestic and foreign statistical results, lightning accidents seriously threat the safety of power grid. The research on measurement system for lightning curt＇cut and lightning overvoltage of high voltage transmission line is of important significance for the lightning protection of the grid. This paper presents a combined measurement technology for measuring lightning current and lightning overvohage. The current sensor is based on the principle of self-integral mode Rogowski coil. Based on the capacitive voltage divider with self-integral mode, the voltage sensor has a unique electrical structure, in which the aluminum shielding shell of the Rogowski coil is used as one plate of capacitor. To measure the general lightning current of 8/20μs and the impulse current with a rise time of 250ns, the results show the designed Rogowski coil has good frequency response characteristics and a stable sensitivity. The impulse voltage test shows that the voltage sensor and its interface voltage divider circuit can measure the impulse voltages with waveform of 0.5/49μs and 1.2/66μs accurately. The proposed technology meets the demand of lightning measurement.