| 摘要 |
PURPOSE:To prevent a transformer main body from causing dielectric breakdown due to electrostatic discharging by branching an insulating oil passage and connecting a fluid electrostatic charging evaluation part tank and connecting a fine ammeter between a metallic pipe provided in the tank in an insulating state and the ground. CONSTITUTION:The cooler 8 of a cooling device B is connected to the transformer main body A by upper piping 7 and lower piping 9. Insulating oil is circulated in a cooling duct 4 in the main body A by those piping 7 and piping 9. Further, an insulating oil circulation path 21 formed by providing an intake and an outlet to the piping 9 is arranged, and the flow rate electrostatic charging evaluation part tank 19 is arranged in the circulation path 21. Further, the metallic pipe 17 which is insulated by an insulating tube 18 is provided in this tank 19, and the fine current measuring instrument 15 is connected between the pipe 17 and a ground line 14. Then, the quantity of fluid electrostatic charging of the insulating oil generated in the main body A is detected by the cooler 8 side to prevent dielectric breakdown due to the electrostatic discharging of the main body A.
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