Test device for thermal properties and failure of cable under action of external radiation heat flows

Abstract

The invention provides a test device for thermal properties and failure of a cable under action of external radiation heat flows. The test device mainly comprises a cable test platform and a corresponding power supply loop. The cable test platform comprises a cable sample to be tested, a cable fixing device and radiation heating wires. The fixing device can adjust a space included angle of a cable. A quality detection device is arranged under the fixing device. The power supply loop comprises a parameter controllable cable power supply loop and a heating wire power supply loop. Through external radiation heating of the cable sample and coupling control of an internal current heat effect, state development modes of heating, burning, flame spread and final failure and critical conditions of the cable sample at different space arrangement inclination angles are determined, therefore heating and burning behaviors of various cables under action of different heat effect are researched, and basis is provided for cable heatproof and fireproof performance test and establishment of a classification standard.

Description

technical field [0001] The invention relates to the field of cable heating behavior, radiation resistance characteristics and related cable fire safety, and more specifically relates to a cable heating characteristic and failure test device under the action of external radiation heat flow. Background technique [0002] The wide application of electrical cables and related technologies not only brings convenience to people's production and life, but also provides guarantee for the development of national economy and industrial level. However, the insulating material of the cladding (such as filling layer, insulating layer, inner sheath layer, outer sheath layer, etc.) as an important part of the cable is often processed from thermoplastic or thermosetting polymers, and the common ones are polymers. Vinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS), etc. These materials are often flammable themselves. In addition to increasing the fire load in the ...

AI Technical Summary

Problems solved by technology

One of the main limitations of this type of method is: firstly, the cables are placed in a single space, which cannot fully reflect the complex layout of cables in reality.

Secondly, in terms of heating or ignition methods, neither local open flame heating nor closed radiation heating can provide accurate experimental initial conditions and boundary conditions.

In addition, the current research methods usually focus on the influence of external heat on the cable material (the cable is not energized during the test), but the research on the heating caused by the abnormal internal current and the coupling of internal and external thermal effects is still relatively scarce.

Therefore, the existing test methods have limited the in-depth quantitative analysis of the cable thermodynamic development and related thermal failure laws.

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