110kV变压器中性点水流保护间隙与避雷器并联保护方式

发布时间：2018-08-08 12:52

【摘要】：为克服传统保护方式的缺陷,提出了1种水流保护间隙和避雷器并联的110 kV变压器中性点新型保护方式。在系统发生非全相运行故障或者单相接地短路且失地时,水流保护间隙形成且立即被击穿(即水流保护间隙动作),从而保护变压器中性点绝缘和避雷器。在雷电过电压下,由避雷器动作泄放雷电流,水流不会喷出,不会形成水流间隙,间隙不会动作;在其他过电压下,水流不会喷出,间隙和避雷器均不动作。对已研制成功的整套水流保护间隙与避雷器并联新型控制系统进行大量试验,研究结果表明:水流保护间隙的工频放电电压和放电分散性都低于同等距离的空气间隙,当工频电压升高到快接近放电电压时,在高压电极头部会产生强烈的电火花。水流保护间隙和避雷器并联新型保护方式可以可靠工作,更有效保护变压器中性点绝缘。
[Abstract]:In order to overcome the defects of traditional protection methods, a new type of neutral point protection method for 110 kV transformers with water current protection gap and lightning arrester in parallel is proposed. In the case of incomplete phase operation fault or single-phase grounding short circuit and ground loss, the water current protection gap is formed and immediately broken down (i.e. water current protection gap action) to protect transformer neutral insulation and lightning arrester. Under the lightning overvoltage, the lightning current is released by the lightning arrester action, the current does not spew out, the flow gap does not form, and the gap does not move; under other overvoltages, the current does not spew out, and the gap and the arrester do not move. A large number of experiments have been carried out on the whole set of parallel control system of water current protection gap and arrester. The results show that the power frequency discharge voltage and discharge dispersion of the water current protection gap are lower than those of the air gap at the same distance. When the power frequency voltage rises to close to the discharge voltage, a strong spark will occur at the head of the high voltage electrode. Water current protection gap and lightning arrester parallel protection can work reliably and more effectively protect transformer neutral insulation.
【作者单位】：武汉大学电气工程学院;深圳供电局;
【基金】：中央高校基金科研业务费专项资金(2012207020206) 国家重点基础研究发展计划(973计划)(2009CB724500)~~
【分类号】：TM862.1

【参考文献】