| 摘要 |
PURPOSE:To simplify the structure of the device and to detect a lightning stroke accurately by spotting a lightning stroke point by utilizing the difference in arrival time between a lightning current which flows through an overhead earth- wire provided successively to a power transmission line and a lightning sound which propagates in space. CONSTITUTION:When a thunderbolt strikes the power transmission line adjoining to a steel tower 3, the lightning current flows through the optical fiber composite overhead earth-wire. This lightning current is detected by a current transformer 4 and an E/O lightning conversion part 5 is operated directly to leads the current to an O/E conversion part 7 through an optical fiber 61. This lightning current information is passed through an amplifier 81 to actuates a monostable multivibrator 82 and is held by a sample holding circuit 84 at the same time to generate a lightning generation signal. Then, an integrator 83 integrates the output of the monostable multivibrator 82 until a lightning noise is inputted through a microphone 9 and the amplifier 81 and the output converted to distance by an A/D converter 85 is transmitted to a remote place by a transmitter 10 through an optical fiber in the overhead earth-wire 1.
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