Triple shielding flame-retardant type power cable special for nuclear power

Abstract

The invention relates to a triple shielding flame-retardant type power cable special for nuclear power, which comprises an outer insulating sleeve, a first shielding layer, an inner insulating sleeve, a second shielding layer, bus insulating grid belts, sub-wires and sub-wire filling press strips, wherein the sub-wires comprise a sub-wire shielding layer, a sub-wire insulating grid belt, a sub-wire protective sleeve, a heat insulating membrane and wire cores; and the heat insulating membrane, the sub-wire protective sleeve, the sub-wire insulating grid belt and the sub-wire shielding layer are sequentially arranged outside the wire cores. The three wire cores are wrapped by the heat insulating membrane, the sub-wire protecting sleeve, the sub-wire insulating grid belt and the sub-wire shielding layer respectively, the three sub-wires are filled and pressed through the sub-wire filling press strips and firmly glued into a cable and each wire core is shielded through three paths of metal, thus, outside electric fields and magnetic fields cannot interfere with the power cable in the transmission course of electric power; the electric and magnetic fields generated by the electric power are shielded to prevent the interference on an electric and control system of the adjacent distribution circuits; and the special ranking structure of the power cable reduces the shaft voltage generated by electric equipment in a frequency conversion circuit in the operation course and protects the practical safety of the electric equipment.

Description

Technical field: [0001] The invention relates to a power cable, in particular to a power cable for nuclear power plants. Background technique: [0002] With the rapid development of the nuclear power industry, the demand for nuclear power output cables is increasing, and the requirements are getting higher and higher. At present, nuclear power cables at home and abroad have proposed "electromagnetic compatibility" without electromagnetic interference requirements. The existing ordinary power cables used for power transmission can no longer meet the requirements, especially the power cables used for frequency conversion circuits, the high-order harmonic interference that inevitably exists during use, when the current passes through the power cables, it will affect the adjacent The electrical and control system of the power distribution line will interfere, and in severe cases, it will bring hidden dangers to the normal operation of the entire system. Safety is very important...

AI Technical Summary

Problems solved by technology

The existing ordinary power cables used for power transmission can no longer meet the requirements, especially the power cables used for frequency conversion circuits, the high-order harmonic interference that inevitably exists during use, when the current passes through the power cables, it will affect the adjacent The electrical and control system of the distribution line will cause interference, and in severe cases, it will bring hidden dangers to the normal operation of the entire system

Safety is very important in nuclear power construction. In the "Nuclear Safety Guidelines", HAD102 / 14 "Nuclear Power Plant Safety-Related Instrumentation and Control Systems" in Chapter 4.8 Electrical Interference emphasizes "the physical separation of signal cables and power cables", Ordinary power cables cannot meet the above requirements, and cannot solve the problem of electromagnetic shielding in the process of power cable transmission.

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