充油密封容器内电弧对燃弧压力产生特性的影响

Effect on Pressure Generation Characteristics by Arc in Oil-filled Closed Tank

变压器在超、特高压输电系统中占有重要地位,变压器油箱内部电弧放电产生的过压使得变压器爆燃发生成为可能,严重威胁电网的安全稳定运行。为了探究大电流条件下电弧特征参量对燃弧故障压力产生过程的影响规律,基于自主建立的首个变压器网侧升高座电弧故障真型模拟试验平台,开展了不同油箱模型、电弧电流与电极间隙等条件下电弧故障真型模拟试验。实现了对升高座筒体上压力数据的采集,获得了不同电流与电极间隙距离的升高座内部压强时域变化曲线。基于试验研究,揭示了大电流下电弧特征对故障燃弧放电压力产生影响的物理机制,提出了升高座内部压力峰值与电弧放电功率之间的关联数理模型,给出了升高座防爆设计的试验和理论依据,推动了变压器防爆设计技术的发展。

Transformer plays an important role in UHV transmission system.The overvoltage caused by arc faults in oil tank makes it possible for transformer to arouse explosion accident,which seriously threatens the safety and stability of the power grid.To explore the effect and law of arc characteristics on pressure generation caused by large current arc fault,the arc fault simulation tests were carried out under the conditions of different models of oil tank,currents,and electrode gaps,and the tests were based on the full-scale arc fault simulation test platform on AC turret of transformers,which is first domestically developed.During the tests,the pressure data on AC turret are collected,and the time-domain curve of pressure on the AC turret under different electrode gaps and different currents and the numerical relationship between the peak pressure inside the turret and the arc discharge power are presented.The study provides experimental and theoretical basis for the design of elevated seats for explosion prevention,promoting the development of transformer explosion prevention design technology.