The present disclosure relates to a wound electrical component comprising a wound body comprising a plurality of wound layers of a web of an electrically insulating material around a longitudinal axis of the body. The wound body comprises a plurality of electrically conducting layers of an electrically conducting material, each printed onto a respective separate area of the web in the wound body. An edge zone of at least one of the plurality of electrically conducting layers is connected to a printed high permittivity layer of a high permittivity material along said edge zone such that at least a part of the high permittivity layer extends, printed on the web, beyond the edge zone.

The present disclosure relates to a wound electrical component comprising a wound body comprising a plurality of wound layers of a web of an electrically insulating material around a longitudinal axis of the body. The wound body comprises a plurality of electrically conducting layers of an electrically conducting material, each printed onto a respective separate area of the web in the wound body. An edge zone of at least one of the plurality of electrically conducting layers is connected to a printed high permittivity layer of a high permittivity material along said edge zone such that at least a part of the high permittivity layer extends, printed on the web, beyond the edge zone.

An anti-pollution-flashover locomotive roof composite insulator, comprising: a support body, and several groups of sheds arranged side by side along the axial direction that are set around the sidewall of the support body, wherein the sheds protrude out of the sidewall of the support body along the radial direction, the upper end of the uppermost shed is set with an upper metal fitting, and the lower end of the lowermost shed is set with a lower metal fitting. The creepage distance of the sheds between the upper metal fitting and the lower metal fitting is 1085 mm-1095 mm, and the arcing distance between the upper metal fitting and the lower metal fitting is 245 mm-255 mm. The insulator employs a long specific creepage distance in terms of structural design, thus providing a good pollution flashover resistance, and under the same pollution condition, a good pollution flashover resistance that is over twice of that of a porcelain insulator with the same creepage distance may be obtained, and hence it is especially applicable for moderate and serious polluted regions.

An anti-pollution-flashover locomotive roof composite insulator, comprising: a support body, and several groups of sheds arranged side by side along the axial direction that are set around the sidewall of the support body, wherein the sheds protrude out of the sidewall of the support body along the radial direction, the upper end of the uppermost shed is set with an upper metal fitting, and the lower end of the lowermost shed is set with a lower metal fitting. The creepage distance of the sheds between the upper metal fitting and the lower metal fitting is 1085 mm-1095 mm, and the arcing distance between the upper metal fitting and the lower metal fitting is 245 mm-255 mm. The insulator employs a long specific creepage distance in terms of structural design, thus providing a good pollution flashover resistance, and under the same pollution condition, a good pollution flashover resistance that is over twice of that of a porcelain insulator with the same creepage distance may be obtained, and hence it is especially applicable for moderate and serious polluted regions.

The present disclosure relates to an electrical wire having a leakage current limiting function, in which, since a neutral line is provided to have a greater cross-sectional area than that of a phase voltage line, a leakage current leaking from the phase voltage line may be limited, and thus the risk of electric shock to the human body due to the leakage current may be minimized.

The present disclosure relates to an electrical wire having a leakage current limiting function, in which, since a neutral line is provided to have a greater cross-sectional area than that of a phase voltage line, a leakage current leaking from the phase voltage line may be limited, and thus the risk of electric shock to the human body due to the leakage current may be minimized.

Refractory composite material based on Al.sub.2O.sub.3 in the form of corundum, SiO.sub.2 in the form of quartz and sodium aluminate having the formula NaAl.sub.11O.sub.17 or Na.sub.2O-11Al.sub.2O.sub.3, method for preparing the same, use thereof for preparing manufactured items, as well as manufactured items made thereby and use thereof.

Refractory composite material based on Al.sub.2O.sub.3 in the form of corundum, SiO.sub.2 in the form of quartz and sodium aluminate having the formula NaAl.sub.11O.sub.17 or Na.sub.2O-11Al.sub.2O.sub.3, method for preparing the same, use thereof for preparing manufactured items, as well as manufactured items made thereby and use thereof.

A polymer bushing includes: an inner conductor; a hard insulating tube; a shielding metal fitting; a polymer covering that includes a body part that covers an outer periphery of the insulating tube, and a plurality of umbrella-shaped sheds that are formed at an outer periphery of the body part; and an electric-field stress-control layer that is composed of a zinc oxide layer or a high-permittivity layer, and is disposed along an interface between the insulating tube and the polymer covering. A rear end part of the electric-field stress-control layer is connected to the shielding metal fitting. The body part includes a first body part that has a uniform thickness, and a second body part that is located in a region around a front end part of the electric-field stress-control layer and has a thickness greater than the thickness of the first body part.

A polymer bushing includes: an inner conductor; a hard insulating tube; a shielding metal fitting; a polymer covering that includes a body part that covers an outer periphery of the insulating tube, and a plurality of umbrella-shaped sheds that are formed at an outer periphery of the body part; and an electric-field stress-control layer that is composed of a zinc oxide layer or a high-permittivity layer, and is disposed along an interface between the insulating tube and the polymer covering. A rear end part of the electric-field stress-control layer is connected to the shielding metal fitting. The body part includes a first body part that has a uniform thickness, and a second body part that is located in a region around a front end part of the electric-field stress-control layer and has a thickness greater than the thickness of the first body part.