PURPOSE: To enable to measure and monitor generated static electricity amount due to insulating fluid flow by circulating the fluid by utilizing the head between two points of the insulating fluid flow passage.
CONSTITUTION: The insulating oil 1 of a transformer A or the like is returned through an upper cooling pipe 2, oil cooler 4, oil circulating pump 5 and lower cooling pipe 3 again to the transformer. A static electricity monitor B is now connected to any two points of the place where the head occurs in an oil circulating system such as, for example, at upper and lower oil collecting valves 8, 9 of the pump 5. Thus, a flow control valve 10 is regulated to become the standard amount preset at the indication of a flow meter 11 so as to measure the charged flow amount at the measuring unit 7 via an ammeter 15. Since the charged amount also depends upon the oil intrinsic resistance ρ or dielectric loss rate tan δ, these measuring electrodes 12 are provided in a charge reducing tank to as to convert the charged amount. When an automatic flow velocity controller is provided in the circulating system, it can always measure under set flow velocity.
YAMADA NAOYA
KISHI AKIO
KAWASHIMA TAKESHI
Next Patent: METHOD OF DETECTING MEGNETIC FLUX COMPONENT OF AC ROTARY MACHINE