Lightning surge detection circuit and lightning surge detection system

摘要

PROBLEM TO BE SOLVED: To provide a lightning surge detection circuit capable of grasping an intrusion route of a lightning surge.SOLUTION: A lightning surge detection circuit 1 having a measurement part 21 capable of measuring a current of an earth wire 94 which is a detection part 22 capable of detecting a value outputted from the measurement part includes: a first detection part 13 set with a predetermined threshold value on a positive side of a reference value; a second detection part 14 set with the predetermined threshold value so as to be the same in a width value as the predetermined threshold value of the first detection part on a negative side of the reference value, and determines which one of the first detection part and the second detection part reaches the predetermined threshold value first by a determination part 15 connected to the detection part, and determines an intrusion route of the lightning surge.SELECTED DRAWING: Figure 1