Pressboard

About: Pressboard is a research topic. Over the lifetime, 1123 publications have been published within this topic receiving 9089 citations.

Investigation of charge behavior in flowing transformer oil/pressboard composite insulation system by electro-optic field measurement

Abstract: Electrostatic charging may occur in oil immersed power transformers because of a flow electrification phenomenon. In order to discuss the charge behavior, we directly measured DC electric field in the oil/pressboard composite insulation system using Kerr electro-optic field measurement method under oil flowing conditions. As a result, even if no voltage was applied, the electric field emerged because of space charge in oil and charge accumulation on pressboard. We changed the flow rate of oil, the arrangement of pressboard barrier, and the applied voltage as parameters. We discussed experimental results from the viewpoint of charge behavior and generated field distribution.

Base plate hot pressing machine

Abstract: The utility model provides a base plate hot pressing machine, it includes be used for placing base (1) of infrabasal plate, the controller that is used for fixing hot pressboard (2) of upper substrate and is used for controlling hot pressboard pressfitting base plate, be equipped with between hot pressboard (2) and base (1) and drive hot pressboard (2) upper and lower gliding guide rail, be equipped with the fixed structure that is used for fixed upper substrate on hot pressboard (2), be equipped with between base (1) and hot pressboard (2) and be used for carrying out the aligning device that counterpoints to upper substrate and infrabasal plate.

Fixing device of winding displacement

Abstract: The utility model provides a fixing device of winding displacement for the fixed action of electron device winding displacement, including pressboard and axostylus axostyle, the axostylus axostyle is located the one end of pressboard, and the both sides face of pressboard is extended at these axostylus axostyle both ends, the axostylus axostyle coupling makes the pressboard to rotate for the electron device shell on electron device's shell, is equipped with two at least buckles in the one side of above -mentioned pressboard suppression winding displacement to the middle recess that is equipped with of one side that has the buckle at the pressboard, the utility model has the characteristics of novel structure, winding displacement are firm etc.

Field relaxation shield for stationally induction apparatus

Abstract: PURPOSE:To make it possible to take sufficient electrical potential from the face of a fibrous molded member even if it is wet, dry or thermally expanded, by mounting metallic conductive strips formed by knitting fine metallic wires on the face of the fibrous molded member. CONSTITUTION:A metallic conductor 13 is formed by knitting soft metallic wires 13a such as fine copper wires into a tape shape, so that it can expand and contract by several percent in the longitudinal direction. Accordingly, if a pressboard 11 containing water corresponding to relation humidity contracts as it dries or is heated, the conductive strip 13 flexibly changes its dimensions according to any change of the basic pressboard 11 and a conductive layer 12 bonded to the surface of the pressboard 11, so that it will not be stripped thereform. Further, the conductive strip 13 has a meshed structure which allows a conductive bonding material to penetrate into the mesh when the strip is bonded to the conductive layer 12, whereby electrical connection as well as bond reliability can be improved.

Drying process of super-thick insulating pressboard

Abstract: The present invention belongs to a drying process of a super-thick insulating pressboard The process comprises the steps of: preparing 05-07% pulp by insulating wood pulp through conventional processing to enter a pulp stabilization box; sending the pulp into a wet raw paper shaper via a pulp pump; sending the prepared wet raw paper into a die with an inner net sleeved; sending the wet raw paper into a pressurizer together with the die for water extrusion, the pressure being 07-09 Mpa; pumping water by assistance of a vacuum pump; taking out the wet raw paper when water content reaching 40-50%; sending the wet raw paper into a microwave drying box through a conveyer belt for drying until the water content reaching 25-35%; pulling out the raw paper into a hot press for drying until the water content of the pressboard reaching 4-6%, the temperature being 115-125 DEG C and the drying time being determined by thickness; unlading the pressboard and sending the pressboard into a semi-finished product chamber with balance processing for 3-5 days; trimming and finishing; and packing the pressboard after the pressboard is inspected and qualified and putting the pressboard in storage