Breakdown voltage measurement for the oil container of insulating oil

摘要

(57) [summary] [purpose] in breakdown voltage test of the insulating oil that is used in OF cable or the like, the dielectric breakdown voltage of dissolved a particular gas has been degassed oil or in this insulating oil, accurately providing a breakdown voltage measuring oil container can be measured. [Configuration] in at least the upper end of the side wall upper transparent window 2 oil container body provided on one, sealing lid 4 that the packing 3 such as silicone rubber is internally provided are mounted, the sealing lid 4 The suction port 5 for the evacuation provided in a sealed container 6 Internal is configured so as to be vacuum suction by the vacuum pump. Also, on the side wall lower portion of the oil container body 1, an oil inlet 7 and a gas injection port 8 are respectively provided, in the interior of the sealed container 6, stirrer 10 is housed. More sealed container 6, a pair of sphere electrodes 11 are opposed across a gap of 2 .5mm. Furthermore, the electrode terminals of the sphere electrodes 11, the voltage circuit 19 is connected, the voltage is increased at a constant speed and is configured to be applied, a voltage measuring device 20 is connected to the voltage circuit 19 ing.