Apparatus for testing cable heating and combustion characteristics under effect of simulating fault arc

Abstract

The invention provides an apparatus for testing cable heating and combustion characteristics under effect of simulating fault arc. The apparatus mainly comprises a cable testing platform and a corresponding power supply loop; the cable testing platform comprises a to-be tested cable sample, a cable channel and an arc starting device; the cable channel is capable of adjusting the space included angle of a cable, and a mass measurement device is disposed below the cable channel; and the arc starting device is capable of precisely controlling the artificial fault arc state in the cable sample. Through the arc heat effect, the state developing mode of processes of being heated, combustion, fire propagating and the like of the cable sample with different space arrangement inclination angle and critical conditions are determined, and therefore the heating combustion behavior of various cables under fault arc effect is researched, and basis is provided for cable arc resistance testing and classification standard.

Description

technical field [0001] The invention relates to the field of cable heating, combustion and cable fire safety, and more specifically relates to a testing device for cable heating and combustion characteristics under the action of a simulated fault arc. Background technique [0002] The rapid development and wide application of cable technology provide an important guarantee for the production and living standards and the development of the national economy. The cladding material as an important part of the cable: insulation materials such as filling layers, insulating layers, inner sheath layers, and outer sheath layers are usually made of thermoplastic polymers (commonly polyvinyl chloride, polyethylene, polypropylene, etc.) etc.) processed. These materials are often flammable. In addition to increasing the fire load of the application site, the thermoplastic cladding material also softens and deforms after being heated (such as cable short circuit, fault arc or external ba...

AI Technical Summary

Problems solved by technology

However, for the study of the thermal effect of arc faults and the mechanism of cable fires caused by arc faults, the above test methods have obvious limitations: First, the cable layout in space is relatively simple, which cannot fully reflect the complex layout of cables in reality Secondly, the ignition of the cable usually adopts an external local open flame ignition method, which is completely different from the fire dynamics of the ignition by the fault arc; at present, the effect of the fault arc mainly focuses on the influence on the electrical characteristic parameters in the cable circuit , and the reports on the arc thermal effect are still relatively rare, so the existing test methods cannot satisfy the in-depth quantitative analysis of the cable fault arc fire behavior

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