摘要:
Electrical insulation system based on poly(butylene terephthalate), optionally containing further additives, wherein said poly(butylene terephthalate) (i) has been obtained by polymerizing a cyclic low molecular weight oligomeric poly(butylene terephthalate) resin, contains (ii) at least one filler material or a mixture of such filler materials in an amount of up to 85% by weight, and (iii) at least one hydrophobic compound or a mixture of such compounds, preferably an organopolysiloxane, in an amount of 0.1% to 10% by weight, calculated to the weight of the insulation system; method of making said electrical insulation systems.
摘要:
The invention relates to a nonlinear field control tape containing ZnO microvaristor particles. The doped ZnO particles are produced by crushing a sintered ZnO block, by desagglomeration or crushing of calcinated granulated particles, or by crushing of a calcined or sintered tape (tape casting). Embodiments, among other things, relate to: hollow ZnO microvaristor particles produced by granulation technique, having reduced average density and having diameters in a range well below 90 µm; and compounding the ZnO filler in binders that are used to impregnate tapes. Compared to nonlinear field control tapes with conventional embedded nonlinear filler particles, a stronger and more reliable nonlinear resistivity is achieved and the ZnO filler is simpler to produce and to compound in the binder. The resulting tapes are flexible, preferably self-adhesive and have a strong nonlinear electrical resistivity. The tapes are useful to protect high field-stress regions in electrical components.
摘要:
The present invention refers to a mold for molding a UV cured article in an inner volume thereof, the mold comprising a mold wall surrounding the inner volume, the mold comprising a UV-transparent polymer and UV radiation deflecting particles immersed in or adhered to a surface of the mold wall. Moreover, the present invention is concerned with an apparatus comprising this mold and a process for molding a UV cured article.
摘要:
Polymer sheds (10,10',10") and insulators (1) with such sheds (10,10',10") are described that perform well in polluted environments. A shed angle (α) of equal to or less than 10°, a shed tip (11,11') radius (R1,R2) of greater than 0.1 mm and in particular equal to or greater than 0.2 mm, but lower than 3 mm results in a material-saving shed with good electrical characteristics. For the insulator (1) with such sheds (10,10',10") an alternating arrangement of the sheds (10,10',10") is preferred and a preferred shed distance (s) is in the range of 20 mm - 40 mm. The minimized design exhibits a small to zero increase in electric field at the shed tip (11,11'), in the dry state, in comparison to sheds and insulators known in the prior art. The thin sheds (10,10',10") perform well in moist and polluted environments. The reduced shed angle (α) and tip radius (R1,R2) allow for the dripping of rain while leaving the underside of the shed dry; long pendant drops, which may lead to flashover, are not observed. The creepage distance of the design is controlled by adjusting the shed radius.
摘要:
High temperature vulcanized silicone rubber with improved tracking and erosion resistance, wherein said high temperature vulcanized silicone rubber comprises a high temperature vulcanized silicone rubber as a silicone base and melamine cyanurate as a filler and at least one inorganic filler which is different from melamine cyanurate, and optionally further additives; wherein the total filler content is within the range of 40 parts (by weight) to 230 parts (by weight) per 100 parts (by weight) of silicone base; and wherein (i) the melamine cyanurate is present within the range of 2 parts (by weight) to 40 parts (by weight) per 100 parts (by weight) of silicone base; and (ii) the at least one inorganic filler which is different from melamine cyanurate is selected from inorganic fillers known to be used in the field of electrical insulations; and shaped articles made therefrom.
摘要:
Electrical insulation system, which optionally contains a filler material and/or further additives, wherein said electrical insulation system comprises poly(dicyclopentadiene) as the main component, and method of making said electrical insulation system.