High voltage and ultrahigh voltage flexible direct current transmission optical fiber composite extrusion insulation power cable

Abstract

The invention discloses a high voltage and ultrahigh voltage flexible direct current transmission optical fiber composite extrusion insulation power cable. A water-resistant conductor is arranged at the center of the cable. A semiconductive wrapping belt, an extrusion inner shielding layer, an extrusion insulation layer, an extrusion outer shielding layer, a first buffer water-resistant layer, a second buffer water-resistant layer, a metal sleeve, a non-metal extrusion outer sheath and an extrusion conductive layer are sequentially wrapped outside the water-resistant conductor. Optical fibers are placed between the buffer water-resistant layers. The insulation layer is made of ultra-clean materials containing a space charge inhibitor, the largest allowable working temperature is 90 DEG C, and the shortcoming of electric field distortion even breakdown caused by space charge accumulation of a traditional cable insulation material is overcome. A copper sleeve is adopted to avoid use of asphalt in corrosion resistance. The power cable achieves the effects of being clean and environment in production and installation, overcomes the electrochemical corrosion shortcomings and prevents environment pollution caused by the fact that a graphite conductive layer is coated on the surface of a traditional cable outer sheath to serve as an experiment electrode by extruding a conductive layer on the outer sheath to serve as the experiment electrode.

Description

technical field [0001] The invention relates to a direct current cable, in particular to an optical fiber compound extrusion insulated power cable for flexible direct current transmission. Background technique [0002] In 1997, the world's first flexible DC cable was put into operation, and the supplier was ABB. With the advancement of technology, the operating voltage level continues to increase. At present, the voltage level of flexible DC cables that have been commercially operated abroad is 200 kV. ABB has completed the type test of 320 kV cables in the laboratory. Most of China's power transmission cables are AC extruded insulated cables, and low-voltage (30 kV and below) flexible DC extruded insulated cables have only been run once in Shanghai, while medium-voltage (above 30 kV to 150 kV), high-voltage (above 150 kV to 250 kV) and EHV (above 250 kV to 500 kV) flexible DC extruded insulated cables have not been used. [0003] In China, the most commonly used material ...

AI Technical Summary

Problems solved by technology

This causes pollution to the environment of the production workshop. When installing terminals and joints in the future, the asphalt is not easy to clean and pollutes the environment on site.

[0009] In addition, in order to check the integrity of the non-metallic outer sheath of the traditional cable, it is necessary to install electrodes on the surface of the outer sheath. Now the surface is usually coated with graphite as the test electrode, but graphite particles are easy to pollute the environment.

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