The characteristics of electricity load for portal crane and electric welding machine of shipyard were introduced in the paper. The principles of reactive compensation of quick “on-off” capacitor set of thyristor, the advantages of technique and the obvious efficiency of economy of it were also described in the paper.%介绍港口门座式起重机和船厂广泛运行的电焊机用电负荷的特点，阐明采用低压交流接触器自动投切电容器的无功补偿屏，为什么不能跟踪门座式起重机和电焊机的用电负荷变化的原因，叙述晶闸管快速投切电容器组的无功补偿原理，以及应用后的技术优点和显著的经济效益。
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