Medium-voltage power cable terminal for high-temperature gas cooled reactor nuclear power station

Abstract

The invention discloses a medium-voltage power cable terminal for a high-temperature gas cooled reactor nuclear power station. The medium-voltage power cable terminal comprises a phase color tube, a double-wall sealing tube, a double-wall branch glove body, a wiring terminal connected with each phase of cable conductor, and a double-wall insulating tube used for enhancing the insulativity of a cable. The phase color tube is arranged outside the sealing tube and used for identifying the phase of the cable; the double-wall sealing tube is arranged at the tail tube of the wiring terminal and covers the upper end part of the double-wall insulating tube; and the lower end part of the double-wall insulating tube covers a finger tube of the double-wall branch glove. The medium-voltage power cableterminal for the high-temperature gas cooled reactor nuclear power station can have a service life of more than 60 years under the working conditions where the conductor working temperature is 90 DEGC, the accumulated irradiation dose of gamma rays is 550 kGy and the relative humidity of the use environment is 100%; and the medium-voltage power cable terminal has the advantages of good insulating property, low partial discharge level, simple structure, convenient installation, high sealing property, long service life, good stability and small partial discharge capacity and the like.

Description

technical field [0001] The invention relates to a medium-voltage power cable terminal for a high-temperature gas-cooled reactor nuclear power plant, and belongs to the technical field of cable accessories for nuclear power plants. Background technique [0002] The power cable terminals of medium voltage cables for nuclear power plants are installed at the head and end of medium voltage cables to realize permanent connection between medium voltage cables and electrical equipment and cable accessories for re-insulation. They are indispensable main auxiliary equipment for nuclear power plants. It is used in a harsh environment and has strict safety requirements. It is a cable accessory with high performance requirements and difficult manufacturing techniques. At present, the maximum dose of gamma-ray radiation resistance of medium-voltage cable accessories used in nuclear power plants is only 275kGy, which is only half of the 550kGy gamma-ray radiation required by high-temperat...

AI Technical Summary

Problems solved by technology

At present, the maximum dose of gamma-ray radiation resistance of medium-voltage cable accessories used in nuclear power plants is only 275kGy, which is only half of the 550kGy gamma-ray radiation required by high-temperature gas-cooled reactor nuclear power plants, which cannot meet the requirements of high-temperature gas-cooled reactor nuclear power plants.

Moreover, the medium-voltage cable terminals currently used in nuclear power plants are prone to water ingress in long-term operation under the condition of 100% relative humidity in the operating environment, resulting in failures, and are electrically insulated under the combined effects of long-term radiation aging, thermal aging, and electrical aging. The performance drops sharply and the partial discharge increases, which brings hidden dangers to the normal operation of the entire system

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