| 摘要 |
PURPOSE:To record a short-circuit start time together with information of ignition and explosion of a power cable by use of a high-speed camera or a video camera, by using a stroboscopic lamp which emits light, synchronizing with a short-circuit current. CONSTITUTION:A video camera 7 is set at a position where a sample 1 can be observed well, and a video body 8 is operated before short-circuit is started. Subsequently, when a hort-circuit current is made to flow to the sample 1, the current flows to a secondary circuit of a current transformer 4, too, a stroboscopic lamp 6 emits light, and it is caught by the video camera 7. After that, ignition or explosion occurs in the sample, but such a state is picture-recorded one after another through the video camera 7. Accordingly, after a short-circuit test has been executed, when a video film is changed to a video through television, etc., the short-circuit start time and also the subsequent status change of the sample 1 are grasped in detail. |
