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首页> 外文会议>Power amp;amp;amp;amp;amp;amp; Energy Society. >A more accurate numerical method to calculate pressure rise due to internal electrical faults in oil-filled power transformer tanks
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A more accurate numerical method to calculate pressure rise due to internal electrical faults in oil-filled power transformer tanks

机译：一种更准确的数值方法来计算由于充电电力变压器罐中内部电气故障导致的压力上升

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摘要

Methodologies in the current state of knowledge to optimize tank geometries for rupture mitigation when internal faults of given arc energy take place, particularly those which use the formula of Hydro Quebec's specification, are sustained on physical conditions valid for early experiments with empty tanks. Such conditions do not happen inside power transformer tanks during normal operation. A numerical method has been devised to calculate pressure rise caused by internal fault gases in tanks of oil-filled power transformers. Fundamental assumption is that compressed volume of hot gases generated from decomposition of oil equals the expansion of transformer tank that withstands inner static pressure. Dynamic load factor that incorporates dynamic effects is used to estimate maximum value of pressure, which then is applied as surface load in finite element model to calculate stress field in tank walls and validate that maximum stress is below rupture strength of steel. Design margin pressure easily follows.
机译：当前弧菌内部故障发生时，优化坦克几何形式的当前知识状态的方法，特别是那些使用Hydro Quebec规范的公式的内部故障，对具有空坦克的早期实验有效的物理条件持续。在正常操作期间，这种条件不会发生在电力变压器箱内。已经设计了一种数值方法来计算油填充电力变压器罐中的内部故障气体引起的压力升高。基本假设是从油分解产生的热气体的压缩体积等于耐压压力的变压器罐的膨胀。包含动态效果的动态负载因子用于估计最大压力值，然后将其作为有限元模型中的表面负荷应用，以计算罐壁的应力场，并验证最大应力低于钢的破裂强度。设计边距压力很容易跟随。

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