电力变压器油箱内部故障压力特征建模及仿真

发布时间：2018-03-22 01:19

本文选题：油浸式电力变压器　切入点：内部故障　出处：《中国电机工程学报》2014年01期 　论文类型：期刊论文

【摘要】：鉴于变压器内部故障后压力升高可能导致油箱开裂、起火及爆炸等事故,长期以来,电力变压器一般装有瓦斯继电器和压力释放阀用于故障切除及油箱过压力释放。但由于业界对其深入研究不足,且鲜有理论创新和性能改进,目前广泛使用的瓦斯继电器存在速动性不足、可靠性较低及阈值难以整定等缺陷。通过分析变压器内部故障造成油箱内压力升高的瞬态物理过程,建立了变压器油箱内部故障压力震源及其波传播的数学模型,有限元仿真变压器内部故障后油箱内压力升高变化情况,得到不同时刻下油箱内部压力分布云图及不同位置压强升高曲线。仿真计算结果揭示了变压器电气网络故障与油箱内非电气量表象之间的关系,为研究基于故障压力特征的数字式瓦斯保护提供理论基础和仿真平台。此外,通过与电力变压器油箱内电弧故障压强升高试验结果的比较,验证了所建模型及仿真手段的正确性。
[Abstract]:In view of the fact that the increase in pressure after the internal failure of the transformer may lead to cracking of the tank, fire and explosion, etc., for a long time, Power transformers are generally equipped with gas relays and pressure release valves for fault removal and over-pressure release of oil tanks. However, due to the lack of in-depth research in the industry, there are few theoretical innovations and performance improvements. The gas relay, which is widely used at present, has some defects, such as lack of quickness, low reliability and difficult setting of threshold, etc. By analyzing the transient physical process of pressure rise in oil tank caused by internal fault of transformer, The mathematical model of the pressure source and wave propagation of the inner fault of the transformer oil tank is established. The finite element simulation results show that the pressure inside the oil tank increases after the failure of the transformer. The pressure distribution in the tank and the pressure rise curve at different locations are obtained at different times. The simulation results reveal the relationship between the failure of the transformer electrical network and the representation of the non-electrical quantity in the tank. It provides a theoretical basis and simulation platform for the study of digital gas protection based on fault pressure characteristics. In addition, it is compared with the test results of arc fault pressure rise in power transformer oil tanks. The correctness of the model and simulation method is verified.
【作者单位】：电力设备电气绝缘国家重点实验室(西安交通大学);
【基金】：国家自然科学基金项目(51277142)~~
【分类号】：TM407

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