| 摘要 |
<p>PURPOSE:To enable the calibration of a super high voltage by connecting a container having a spherical clearance to a pressure vessel housing a sample to ensure that an imposed voltage can be calibrated using the spherical clearance under a gas insulation. CONSTITUTION:A shell nozzle section 8 and an end plate 9 are mounted on a pressure vessel 3 housing a sample and a ball on the high voltage side of a spherical clearance 10 is retained airtight with a pertition 7 being connected to a center conductor of the sample 5 while the ball on the low voltage side is taken out being retained airtight with the end plate 9 and a handle 11 is mounted to adjust the spherical clearance. The pressure vessel 3 is filled with an SF6 as insulation gas until it reaches a prescribed test gas pressure of the sample 5. The spherical clearance device is filled with the SF6 to calibrate the discharged voltage beforehand by changing the gap length and the gas pressure. The confirmation of the discharge in the spherical clearance 10 is done by moni- toring voltage and current and by visual inspection through a peep window 8D.</p> |
