Insulator (electricity)

About: Insulator (electricity) is a research topic. Over the lifetime, 15941 publications have been published within this topic receiving 108950 citations. The topic is also known as: electrical insulator.

Additive printed circuit boards with flat surface and indented primary wiring conductors

Abstract: High density primary wiring patterns are formed on printed wiring boards with far less than 0.005 inch spacings and wiring conductor widths, which surprisingly permit wider conductors of at least three times the wiring spacing thus less likely to have open circuit or substrate adherance defects. This is achieved by depositing on an irregular surface of a conventional "flat" panel insulator a thick liquid photopolymer layer of paste-like consistency, such as 0.006 inch thickness, flattening it with the image bearing side of a glass plate phototransparency to produce high resolution wiring patterns comprising ridge tops defining insulating spacing between channel conductor areas therebetween by means of uncollimated actinic radiation, forming thin conductive layers 0.0014 inch thick on the channel bottoms and sidewalls to produce wider conductors, and sanding off the flat ridge tops to assure that there are no short circuits between adjacent conductors.

Shielded cable assembly comprising means capable of effectively reducing undesirable radiation of a signal transmitted through the assembly

Abstract: For reducing undesirable radiation of a signal, a shield cable assembly includes a cylindrical magnetic member fitted around a shielded-conductor cable to which a shielded joint is electrically and mechanically connected. An inner insulator is mounted in a connecting portion between the cable and the joint so as to support electrical contacts of the joint together with extened portions of insulated conductors of the cable, in electrical connection with one another. An electrical conductive coating is applied on the surface of the inner insulator, and is electrically connected to a cable shield of the cable. As a result, the magnetic member and the coating cooperate to reduce undesired radiation of signals from the assembly. In addition, an outer insulator encloses the inner insulator and the magnetic member, thus to connect mechanically the inner insulator with the magnetic member.

Novel insulator with interfacial σ-FGM for DC compact gaseous insulated pipeline

Abstract: Electric field optimization plays a significant role in the insulation design of gaseous insulated pipeline (GIL) for the DC power system. Functionally graded material (FGM) with spatial distribution of conductivity σ (σ-FGM) provides a potential method to uniform the electric field and thus reduces flashovers to some extent. However, researches at present are nearly at a standstill for the complicated fabrication techniques and huge bulk conduction losses. In this paper, a novel cone-type insulator with surface conductivity gradient was proposed based on direct fluorination treatment. Theoretical analysis shows that the electric field distortion near the high voltage electrode can be effectively suppressed with increasing the thickness and conductivity of the fluorinated layer. Epoxy cone-type insulators with homogeneous and graded surface conductivity were then prepared by different fluorination treatments to verify the effectiveness of σ-FGM design. As for the homogeneously fluorinated cone-type insulators, the DC flashover characteristics were improved with the rise of fluorination time. Especially, the flashover voltage of the insulators with σ-FGM layers can be raised by up to 36.3 % compared with that of the traditional ones, owing to a more uniform electric field distribution. Theoretical and experimental results prove that the insulator with surface σ-FGM is a promising choice for DC compact GIL.