基于局部放电统计特征参量分析的矿用干式变压器绝缘状态评估

发布时间：2019-03-13 14:27

【摘要】：为了研究矿用干式变压器绝缘状态的评估方法,在恒温下对一台已经在煤矿井下无故障连续运行13 a、额定电压Un为10 kV、额定容量为500 kVA的矿用干式变压器进行了恒温电应力加速老化试验,老化期间以1 d为周期在屏蔽室环境下测量了干式变压器的局部放电(PD)信号,以2 d为周期进行了工频耐压试验;提取了局部放电信号的统计参量作为基础特征量,得出了各统计参量对应的价量趋势(PVT)图。研究结果表明各统计特征量在老化前期数据比较平稳,老化中期斜率绝对值明显增大,而老化末期均有明显的转折点,并且其变化趋势有明显改变。最后,依此提出了利用局部放电统计特征量及其变化规律诊断矿用干式变压器绝缘老化状态的新方法。
[Abstract]:In order to study the evaluation method of insulation state of dry type transformer for mine use, a continuous operation of 13 a at constant temperature and a rated voltage of 10 kV, for a non-fault-free underground transformer has been carried out in a coal mine. The constant temperature electric stress accelerated aging test was carried out on the dry type transformer with rated capacity of 500 kVA. The partial discharge (PD) signal of the dry transformer was measured in the shielded room environment with a period of 1 d during the aging period. The power frequency withstand voltage test was carried out with the period of 2 days. The statistical parameters of partial discharge signal are extracted as the basic characteristic, and the valence trend (PVT) diagram of each statistical parameter is obtained. The results show that the statistical characteristics are stable in the pre-aging period, the absolute value of the slope in the middle phase of aging is obviously increased, and there are obvious turning points in the end of aging, and the trend of its change is obviously changed. Finally, a new method to diagnose the insulation aging state of dry-type transformer used in mine is put forward based on the statistical characteristic quantity of partial discharge and its variation rule.
【作者单位】：太原理工大学电气与动力工程学院;西安交通大学电气工程学院;
【基金】：国家“十一五”科技支撑计划重点项目(2007BAK29B05;2007BAB13B01)~~
【分类号】：TM412

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