And PVC sound insulation effect is good, but because of its anti-aging, thus cannot be used in outdoor environment.
而PVC的隔音作用虽好，可是因为其不抗老化，因此无法在户外环境下运用。
With the prevention of insulation aging as the key, service life management for transformers includes transformer fault forecast, on the spot fault diagnosis, trend analysis and state examination.
变压器的预警系统、现场诊断、趋势分析、状态检修是寿命管理的内容，防止变压器绝缘老化是关键。
Instructive analysis on power cable junction faults is carried out and an algorithm for indirect on line measuring of cable junction resistance and insulation aging is proposed.
对电缆接头故障进行了一些有益的分析，提出了一种间接在线评估接头电阻和绝缘老化的算法，从理论上验证了接头温度与接头质量的相关性。
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