分段保护超导螺线管磁体失超过程的过电压

超导磁体失超过程的过电压准确分析是失超保护系统设计的基础。对于分段保护的超导螺线管磁体,在传统椭球形正常区失超传播模型的基础上,将3维温度计算结果映射到1维导线方向上,确定沿导线的温度分布,进而计算出各匝电阻。将线圈看作以匝为单位的电阻和电感组成的电路,计算出沿导线的电阻电压、电感电压以及合电压瞬态分布,较准确地估计了失超过程中最大对地电压、层间电压和匝间电压。利用该方法对某分段保护的螺线管磁体进行了计算,获得了失超过程中磁体内部过电压;发现磁体内部的电压分布由方向相反的电感电压和电阻电压共同决定;以单段正常区电阻电压作为该磁体对地电压过于保守。

Over voltage for multi-sectioned superconducting solenoid magnet during quench process

Accurate analysis on over voltage in a superconducting magnet during quench process is the basis of quench protection system design for the superconducting magnet. For multi-sectioned superconducting solenoid, based on the classical assumption of ellipsoidal normal zone, three-dimensional temperatures are mapped to one dimension along the conductor and then the temperature distribution along the conductor and the resistances of each turn are obtained. The coil is treated as a circuit composed of turn resistance and turn inductance, and resistive voltage, inductive voltage and resultant voltage along the conductor are calculated, thus the peak coil-to-ground voltage, layer-to-layer voltage and turn-to-turn voltage are better estimated. This method was applied to analysis of a multi-sectione