43results about How to "Reduce electric field distortion" patented technology

The invention discloses organic fluorine-modified epoxy resin for improving the flashover voltage along a surface, as well as a preparation method and application thereof. The organic fluorine-modified epoxy resin is prepared by selecting bisphenol A epoxy resin and hexafluoro-bisphenol A as raw materials in a mild environment under the effect of catalyst tris(dimethylaminomethyl)phenol; the resinperformance can be realized through the reasonable proportion of raw material dosage, the process is simple, and industrial production can be easily realized; then, the modified resin serving as a base material is added with a curing agent, filler and accelerant to prepare the modified resin composite material. According to the preparation method, -CF3 group is introduced into epoxy resin under the situation that the surface state of an epoxy composite insulating material is not changed, the volume / surface specific resistance of the material can be reduced, charges cannot be easily gathered to the material surface, and the flashover voltage along a surface of the epoxy resin composite material can be improved.

A liquid crystal display and a manufacturing method are provided. A liquid crystal display according to an exemplary embodiment of the present invention includes: a first substrate; a second substrate facing the first substrate; a liquid crystal layer interposed between the first substrate and the second substrate, and including liquid crystal molecules; a first electrode positioned on the first substrate; an insulating layer positioned on the first electrode; a second electrode positioned on the insulating layer; and a third electrode positioned on the second substrate, wherein the second electrode includes a plurality of branches and a slit between neighboring ones of the branches, and a width of the slit is more than about two times to less than about five times a width of its corresponding branches.

A manufacturing method of a liquid crystal display includes forming a sacrificial layer on a liquid crystal panel, forming an etch stop layer on the sacrificial layer, forming a photo resist pattern on the etch stop layer, completing the etch stop layer using the photo resist pattern as a mask, ashing the photo resist pattern and the sacrificial layer by using the completed etch stop layer as a mask, forming a microcavity by removing a portion of the sacrificial layer and forming a liquid crystal layer in the microcavity.

A fluid-insulated electrical apparatus includes a grounded tank which is an airtight metal vessel filled with an insulating fluid. A conductor to which a high voltage is applied is disposed in the grounded tank. A metal plate that is press-processed to have an inclined portion and a groove between adjacent head top portions is fixed to and electrically connected to an inner wall of the grounded tank.

A liquid crystal display includes a first substrate, a first field generating electrode arranged on the first substrate and including first and second cutouts, and a second substrate facing the first substrate. A second field generating electrode is arranged on the second substrate and includes a third cutout, and a liquid crystal layer is interposed between the first and second field generating electrodes. A column spacer is interposed between the first and second substrates and is disposed in the first cutout region.

The invention discloses a preparation method of an Al3C4-Al2O3-ZrO2 wear-resistant composite coating on the surface of aluminum alloy. According to the preparation method, an electrolytic tank of a single-groove structure is adopted, and a mixed solution prepared from zirconium nitrate, urea, formamide and glycerin is used as an electrolyte. The cathode side is covered with an aluminum oxide ceramic sheet with the size similar to the size of a workpiece so that a non-conducting shielding effect can be achieved in the discharging process, electric field distortion caused by the edge effect around the cathode is reduced, and discharging of the cathode is more uniform. A direct-current voltage or a pulse voltage is applied to the electrolytic tank, so that a continuous and uniform air film israpidly formed on the surface of the cathode, continuous plasma micro-arc discharging can be caused on the surface of the aluminum alloy, and accordingly, the stable, uniform and hard ceramic coatingis formed on the surface of the aluminum alloy. By adoption of the preparation method, the wear-resistant and corrosion-resistant coating with high hardness, a small friction coefficient and a low wear rate can be prepared on the surface of the aluminum alloy, and thus, the application of the aluminum alloy in the fields of traffic, energy and the like is effectively widened.

A liquid crystal display and a manufacturing method are provided. A liquid crystal display according to an exemplary embodiment of the present invention includes: a first substrate; a second substrate facing the first substrate; a liquid crystal layer interposed between the first substrate and the second substrate, and including liquid crystal molecules; a first electrode positioned on the first substrate; an insulating layer positioned on the first electrode; a second electrode positioned on the insulating layer; and a third electrode positioned on the second substrate, wherein the second electrode includes a plurality of branches and a slit between neighboring ones of the branches, and a width of the slit is more than about two times to less than about five times a width of its corresponding branches.

The invention discloses a stress control body for a plastic insulation high-voltage and direct-current cable connector, and relates to the stress control body for the cable connector. The stress control body for the plastic insulating high-voltage and direct-current cable connector aims at solving the problems that an existing plastic insulation direct current cable prefabricated connector structure hardly meets the requirement for connecting a plastic insulation high-voltage and direct-current cable prefabricated connector with the voltage over 160 kilovolts, and at present a mature plastic insulation direct current cable prefabricated connector design scheme does not exist. The stress control body for the plastic insulating high-voltage and direct-current cable connector is a stress control body for a cross linked polyethylene insulated high-voltage and direct-current cable connector with the voltage between 160kV and 500kV, and is composed of a high-voltage shielding layer, a strengthening insulator, a stress cone and an outer shielding layer, and two side end ports of the strengthening insulator are in a trapezoid shape. According to the stress control body, electric field distortion inside the prefabricated connector can be effectively reduced, the diameter of the prefabricate connector is reduced, the prefabricated connector is convenient to install, the heat dissipation property of the prefabricated connector is improved, and the stress control body can be applied to designing the plastic insulation high-voltage and direct-current cable with the voltage over 160 kilovolts.

The invention discloses a planar electrode structure suitable for vacuum surface flashover, including an insulating fastener, a high voltage electrode, a ground electrode, an insulating bracket and aninsulator to be measured. A groove is arranged in the middle of the upper part of the insulating bracket, and the insulator to be measured and the groove are matched. The high voltage electrode and the ground electrode are in surface contact with the insulator to be measured. The high voltage electrode and the upper part of the ground electrode are connected with a pressing mechanism, and the clamping mechanism keeps the close contact with the insulator to be measured. The pressing mechanism includes the insulating fastener, an electrode fixing bolt I and a fixing bolt I. The electrode fixingbolt I is connected with the insulating fastener. The fixing bolt I is matched with the electrode fixing bolt I. The insulating fastener is connected with the insulating bracket at the lower part through a support piece. The planar electrode structure has the advantages of simple structure, good discharge stability, small influence of the gap electric field of the vacuum surface flashover, reduction in the discharge dispersion of the vacuum surface flashover, high reliability, strong operability, long service life, and small influence of the electrode fixing and the insulating support structure on the gap electric field.

The invention relates to an ultra-high voltage direct current power cable. Specifically, the present invention relates to an ultra-high voltage direct current power cable capable of simultaneously preventing or minimizing electric field distortion and loss of direct current dielectric strength due to space charge accumulation in an insulator. Reduction and reduction of pulse damage intensity.