Novel lightning current sensor based on Printed Circuit Board Rogowski coil

The amplitude of lightning current is high and its rising time is short enough to cause over voltage in the power system. Tranditional Rogowski coil has been widely used in the lightning current measurement system for its magnetic saturation and good insulation performance. Owing to the shortcomings of traditional Rogowski coil such as the uneven distribution parameters and the unequal density of turns, the paper proposes a novel lightning current sensor based on Printed Circuit Board(PCB) Rogowski coil. The target bandwidth of the sensor is determined by analyzing the spectrum of 8/ 20μs typical lightning current. The sensor is designed using the existing technology, and its actual parameters were measured for the design of the integral circuit. The high impulse current experiments show that not only the sensitivity of the sensor is satisfied, but also it has good linearity. Moreover, the output waveform of the sensor is consistent with the standard waveform. So the sensor can fully meet the requirement of engineering.