L.S.P. E

20/28

DISCUSSIONDISCUSSIONLightning rodgroundbuildinggroundcablecableoverhead grounding wireelectricpolelightninglightninglightning rodshield angle(45 – 60 deg.)Overhead grounding wire20QUESTIONIs there a way to protect electronic instrument from a direct lightning strike?We recommend to use both lightning rod and surge protector at the place where direct lightning might strike.Energy of the direct lightning strike is enormous, only surge protector alone can not protect the instrument. Buildings which lightning might strike should set the lightning rod at the place where building is located in the shield angle. Also, set the overhead grounding wire on the cable. Arrange as most of lightning energy is absorbed by the lightning rod and overhead grounding wire and absorb only the rest by the surge protector.Surge protectors can be thought of as consumable items in areas where lightning is common. We would recommend you to pe-riodically check your surge protectors and keep enough replacements on hand for next lightning season. M-Systemʼs model C-106A-1 M-Rester Tester can be used to check most surge protectors for proper function.M-System has unique lightning surge protectors with life monitoring function. These lightning surge protectors tell us that it is time to change by the monitor lamp or relay contact so you do not need to worry if it is time to change.Lightning rodIt induces the lightning strike voluntarily and works as the lightning does not strike buildings nearby. The shield angle range is between 45-60 degree conic. Simply burying cables is not effective due to the induced electromotive force that occurs around the cable because of impulse current in the ground near a lightning strike.Overhead grounding wireThis is a grounding wire which is attached to a overhead transmission line. Its effect is similar to having several lightning rods in a row which shield the lines under them from the lightning strike.1ANSWERANSWERQUESTIONA remote field transmitter connected to a local indicator which is protected by a surge protector begins to show inconsistent display value. What could be the trouble?It may be time to replace the surge protector due to its lessened capacity, if the problem just started recently. Each surge protector has a different lifetime. Surge protectors, which have been installed in areas where lightning occurs frequently, should be tested and replaced periodically. Replacing the surge protector with a new one in this instance may solve the problem.2ANSWERANSWER

※このページを正しく表示するにはFlashPlayer10.2以上が必要です