为了解决电缆安装或制造过程中的潜在缺陷,通过向尚未投入运行的新电缆预先注入有机硅修复液(即预修复),研究修复液注入后对电缆的绝缘结构及电气性能的影响.首先通过压力注入装置将有机硅修复液注入到电缆样本中,测量新电缆样本和预修复液样本的工频击穿电压,记录两种样本在击穿过程中的温升情况.然后将两种样本放置3个月,再次测量样本的工频击穿电压并进行对比.结果表明:预修复电缆样本的工频击穿电压高于新电缆样本,且两种样本在击穿过程中的温度差别不大,说明修复液对工频击穿的热效应影响不明显.将电缆放置3个月后,预修复电缆样本的击穿电压较注入修复液后的电缆样本击穿电压有所下降,但仍高于新电缆样本的击穿电压.根据绝缘层电容模型和介电泳原理,说明预先注入到尚未投入运行电缆的修复液使得电缆绝缘不再是均匀介质,而是分阶绝缘复合介质,从而提高了电缆的绝缘性能.
In order to eliminate the potential defects in the installation and production of cables, the sili-cone rejuvenation liquid was injected into the cross-linked polyethylene (XLPE) new cables (pre-repaired), and the effect of pre-repair on the insulation structure and insulating properties of the new cables was investigated. At first, the rejuvenation liquid was injected into the cable samples by pressure injection equipment, and the breakdown voltage and temperature of the new cable samples and the pre-repair sam-ples were measured. Then the two samples were placed for three months, and their breakdown voltage was measured again. The results indicate that the breakdown voltage of the pre-repair cable samples is higher than that of the new samples, and there is little difference between the temperatures of the two samples, indicating that the influence of silicone rejuvenation liquid on the thermal effects is not obvious in the breakdown test. The breakdown voltage of the pre-repair cable samples after placed for three months is lower than that of the pre-repair cable samples, but it is still higher than that of the new cable samples. According to the capacitance model of insulation layer and principle of dielectrophoresis, the cable insulation is no longer a homogeneous medium after injecting rejuvenation liquid, it turns into a grated insulation composite medium, so the insulating properties of the XLPE cable is improved.
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