Novel lightning current monitor system based on the differential loop for 110kV transmission line

In a high voltage power system, it is hard to measure directly and expediently the lightning currents accurately and safely. So aiming at solving the problem of accurate and safe measurement of the lightning current on the overhead transmission lines, a novel lightning current monitor system based on differential loop which has been widely used in the pulse power measurement technique is applied, which can measure the lightning current on overhead transmission lines contactlessly considering the actual running conditions in the 110kV level of transmission line. In this essay, the principle of the sensor for measuring lightning current and the design of the whole monitor system structure are introduced. In laboratory by using the high impulse current generator to simulate the lightning currents, the experiment results show that: for the 1.4m measured distance, through adjusting the sensor parameters and choosing reasonable shielding, the lightning current monitor system can collect the data of the high impulse currents accurately and completely, and the monitor system has the advantage of safety, strong anti-interference, endurance and accuracy.