快速应对电网闪对EAST低温系统影响研究

Study on quickly disposal for the influence of the exigency(power grid flickering) to the EAST cryogenic system

EAST氦低温系统是EAST(Experimental Advanced Super-conducting Tokamak)先进超导托卡马克实验装置重要子系统之一;EAST氦低温系统是高能耗能系统,拥有7台氦压缩机(4台低压缩机,3台高压缩机),总功率达到1.4 MW左右,由于EAST实验是连续运行(每次在120天以上),中间不能有停机、停电等事故,否则实验无法正常运行。其供电稳定性是个大问题,对供电系统、变电站的要求都很高;然而在实验期间由于一些非人为因素,还是出现几次"电网闪"跳电事故,低温系统压缩机部分或全部停机、氦透平膨胀机全停、冷却水泵系统全停、真空泵系统全停等事故。若事故处理不当会导致丢气、管道压力过高、液氦容器爆炸、损坏磁体等严重后果。文中给出了EAST实验期间出现电网闪的事故时进行相应处理步骤与一些快速应对的操作经验。

EAST cryogenic system is one of the most important subsystems of EAST tokamak. Otherwise, EAST cryogenic system is the high energy consume system, the power is about 1.4 MW. The stability of power supply system is an important problem to the system. Power grid flickering can cause part or all heilum compressors stopped, all the helium turbines stopped, all the vacuum pump stopped and other accidents. If it is disposed unsuitably, leakage of gas helium, piping blast and damage of superconducting magnets will take place. Some disposals approach of the power grid flickering during the EAST Experimental were given, and the operational experience was also presented in this paper.