A test system and test method for cable combustion and pyrolysis characteristics under multi-variable parameter environmental conditions

Abstract

A test system for cable combustion and pyrolysis characteristics under multi-variable parameter environmental conditions, including a gas supply component, a test box, a monitoring component, and an analysis control component; the gas storage cylinder group of the gas supply component mixes the mixed gas through a gas mixing device Input into the test box; the top of the test box is equipped with a radiation source, the bottom is equipped with a sample holder, the front side is equipped with an observation component, and the exit at the right end is opened and closed through a smoke collection hood; the bottom of the radiation source is equipped with a baffle, and the observation component and analysis Connection of control components, including infrared thermal imager and high-definition camera; connection of monitoring components and analysis control components, including embedded thermocouple, heat flow meter, gas sensor, quality sensor; analysis control components include display panel, control panel, data collector and microprocessors. The test system realizes the control of environmental parameters such as ambient atmosphere, ambient temperature and external radiation intensity, and truly simulates the actual combustion environment of cables, thereby realizing cable combustion or pyrolysis under multi-variable parameter environmental conditions.

Description

technical field [0001] The invention relates to the field of combustion and pyrolysis characteristics, in particular to a test system and method for cable combustion and pyrolysis characteristics under multi-variable parameter environmental conditions. Background technique [0002] As a new type of underground facility, the underground comprehensive utility gallery is gradually being popularized and applied because it can accommodate more power cables and other pipelines. When a large number of power cables are working, they are densely laid and prone to heat, and when the cable joints are in poor contact, overloaded or short-circuited, the temperature will gradually increase or even cause a fire. In recent years, the proportion of fires caused by wires and cables has remained high, causing serious casualties and losses. Therefore, it is particularly important to study various types of wires and cables, test their combustion and pyrolysis characteristics in different enviro...

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Problems solved by technology

[0003] Now the more common combustion and pyrolysis characteristics testing instruments include cone calorimeter, thermogravimetric analyzer, oxygen index meter and flame retardancy tester, etc., which can be used to measure the characteristic parameters of various materials under normal circumstances, heat Pyrolysis performance and combustion performance, etc., but cannot meet the measurement requirements in special circumstances, such as the cone calorimeter cannot measure the relevant characteristics of material combustion and fire spread, and the thermogravimetric analyzer can only be used for material weight loss in a flameless and non-combustible state The characteristics and oxygen index tester can only change the ambient atmosphere of material combustion, etc., and some combustion and pyrolysis characteristics test devices cannot meet multiple measurements through a single device. The variable parameters of the environment are limited, resulting in the combustion and heat of the cable. The inaccuracy of the solution characteristic test;

[0004] The existing application number is CN201610950542.4 invention patent: experimental method of fire spread characteristics of combustibles under different temperature, humidity and oxygen concentration conditions, including experimental bench, gas storage cylinder group and analysis control cabinet, through different environments (different humidity, Real-time, quantitative evaluation and analysis of the mass loss rate, sample surface temperature, and smoke toxicity during the combustion process of combustibles under different oxygen concentrations) conditions. The temperature of the space in which it is located and the thermal radiation it receives, and the materials in the actual fire are affected by the ambient temperature and radiation, and the combustion characteristics will change. This method cannot meet the test requirements.

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