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本文介绍一种估算机车电缆绝缘寿命的方法。随着机车热效率的提高,其电缆电流额定值也在增大,这使得电缆绝缘材料承受着更高的工作温度。在这种情况下,本文这种估算方法也显得更加重要。采用本项技术,首先对绝缘材料进行几种恒定高温的试验,以便确定它们的热老化特性。根据材料的性能数据,计算承受机车工作循环热应力的绝缘材料的寿命。这种方法可以很容易地用于测量温度循环对电缆寿命的影响,客观地比较各种绝缘材料的性能,确定机车电缆的设计限值。另外,还可以用来制定美国铁路协会的根据现场使用实际条件进行热老化试验的规范要求。已经研制出一种通过试验和工作循环分析来估算电缆寿命的方法,并且通过实际使用证明是可靠的。一种由GE公司电线电缆部研制的新型高性能绝缘材料,在今天高性能机车所要求的变化条件下,被证明具有良好的使用寿命。
This article describes a method of estimating the insulation life of locomotive cables. As locomotive thermal efficiency increases, the cable current rating is also increasing, which makes the cable insulation withstand higher operating temperatures. In this case, this method of estimating this article is also more important. Using this technique, several constant high temperature tests of the insulating material are first conducted to determine their thermal aging characteristics. According to the performance data of the material, calculate the service life of the insulating material that withstands the thermal stress during the working cycle of the locomotive. This method can be easily used to measure the effect of temperature cycling on the life of a cable. Objectively compare the performance of various insulating materials and determine the design limits for locomotive cables. In addition, it can also be used to develop the American National Railway Association, according to the actual conditions of field use thermal aging test specification requirements. A method of estimating the life of a cable by testing and working cycle analysis has been developed and proved to be reliable through practical use. A new high-performance insulating material developed by GE’s wire and cable division proved to have a good life expectancy under the changing conditions demanded by today’s high-performance locomotives.