Seven-core fireproof cable

Abstract

The invention relates to a seven-core fireproof cable. Seven phase line cable cores coated with insulating layers constitute a cable phase line conductor. A metal shielding layer is pre-arranged in the insulating layer of each phase line cable core. The cable phase line conductor is coated with an inner sheath and an outer sheath in turn from inside to outside. A belting layer is arranged betweenthe sheaths. There is a phase-N phase line cable core in the center of the cable phase line conductor. Two sets of phase-A, phase-B and phase-C phase line cable cores are distributed uniformly, at intervals and in a staggered manner along the circumference outside the phase-N phase line cable core. A fireproof material layer fills the gaps of the phase-N phase line cable core and the two sets of phase-A, phase-B and phase-C phase line cable cores. The inner sheath is a rubber layer. The outer sheath is a stainless steel strip armored layer. The seven-core fireproof cable has high rigid supportstrength and excellent fireproof performance. Cable phase line laying required by star-triangle step-down starting can be completed at a time. The seven-core fireproof cable has the advantages of fewer accessories, short project cycle, time and labor saving, and convenient installation.

Description

technical field [0001] The present invention relates to a 7-core fireproof cable, which is specifically applied to the star-delta step-down starting mode. Background technique [0002] Inverters and other equipment need to be started through the star-delta step-down starting method. The cables of the star-delta step-down starting method are generally laid with two cables, and the two cables need to be connected and installed separately. The cost is high, and fire protection requirements are also required; although some cable products can realize the star-delta step-down starting mode, the signal interference between the conductor cores of each phase is too large, which affects the starting effect. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a 7-core fireproof cable, which can adapt to the star-delta step-down starting mode, has little signal interference, simple structure, convenient installation and laying, ...

AI Technical Summary

Problems solved by technology

[0002] Inverters and other equipment need to be started through the star-delta step-down starting method. The cables of the star-delta step-down starting method are generally laid with two cables, and the two cables need to be connected and installed separately. The cost is high, and fire protection requirements are required; although some cable products can realize the star-delta step-down starting mode, the signal interference between the conductor cores of each phase is too large, which affects the starting effect

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