船用电缆红外检测及诊断研究

The Research of Infrared Inspection on Cable of Ship

针对船用电缆受高温、高湿、高盐的影响而经常发生局部老化故障的问题,以某型电缆为对象建立了一个三维导热模型,结合实验测量数据利用有限元法对其三维温度场进行仿真,并与实验测量结果进行比较,验证了模型的准确性;在此基础上对电缆发生局部老化故障时的温度场进行了研究。结果显示,电缆绝缘良好时,电缆表面温度场分布均匀,当发生局部老化故障时,电缆表面温差增加;电缆表面最高温度和最低温度出现在老化部分两侧,通过红外热像仪监测其温度场的变化可以快速准确地对电缆老化故障进行诊断。

Aiming at the aging problem of ship cable which affected by the temperature, moisture and salinity, a three-dimensional mathematical heat transfer model has been built according to the structure of cable. The temperature field of cable has been simulated based on the experiment, and the correctness of model has been proved by the results of experiment. The aging problem of cable has been based on the model. And the results of study show that the temperature field of cable is uniform when it runs normally. But when it is partially aged, the surface temperature difference increases, and the highest temperature and lowest temperature exist at both sides of the aging segment. Variation between different parts of cable surface is more and more obvious with the aging degree increasing. The partially aging fault of cable can be diagnosed by the infrared inspection quickly.