STATIC INDUCTION EQUIPMENT

• Main Authors: KOJIMA KEIMEI, MIYAO HIROSHI, FURUKAWA SADAO
• Format: Patent
• Language: English
• Published: 22.01.1999
• Edition: 6
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; INDUCTANCES; MAGNETS; NATURALLY-OCCURRING ELECTRICITY; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; STATIC ELECTRICITY; TRANSFORMERS

PROBLEM TO BE SOLVED: To protect a static induction equipment against dielectric failures caused by flow charge by a method, wherein a porous low-charge member is provided to the surface of an insulating member where insulating liquid flows. SOLUTION: Flow changing rings 35 to 38 which enable insulating oil 7 flowing through a vertical cooling path 100B to flow through a horizontal fooling path 100A are provided to the inner circumferential surfaces of an insulating cylinder on a core 1 side and another insulating cylinder on a tank side respectively. Porous fluororesin layers 104, 111, and 112 of porous low- charge member are provided to the surfaces of insulating members near the inlets and outlets of the flow-changing rings 35 to 38 and provided to the inner circumference of an intermediate cooling hole as indicated by circles. The porous fluororesin layer is formed through such a manner that polytetrafluoroethylene(PTFE) films are pasted together. A PTFE pipe is of resistivity 10 (Ω.cm) in a current density range of 1 to 10 (pA/cm ).