| 摘要 |
PURPOSE:To improve the reliability of an insulator in a foil wound transformer by detecting a value based on the inductance variation of the transformer during winding work of a foil wound coil to discover the shortcircuit of the coil during the winding work. CONSTITUTION:An insulating cylinder 15 is attached to a winding machine 14, and a lead 16 is started to be wound. In this case, a foil wound coil 17 is made of an insulating sheet 18 and a metal sheet 19, and fed by guide rollers 20, 21. An inductance measuring unit 22 is provided between the lead 16 and the roller 21 to measure the inductance of the coil. Since the sheet 19 is not insulated and the roller 21 used metal, it can be used as the terminal of the coil to eliminate the influence of the metal sheet feeding side can be eliminated by grounding at 23. Thus, when a shortcircuit occurs between the turns of the coil 17, a voltage drops or a current increases. Thus, the malfunction of the coil can be early discovered to largely improve the reliability of the insulator. |
