电力变压器短路电抗在线测量方法研究

Research on the On-line Measuring Method of Transformer Short-circuit Reactance

电力变压器的短路电抗是设计及运行过程中表征变压器本体抗短路电流冲击能力的重要参数。本文分析了基于电气量特征的短路电抗在线测量方法及对变压器运行状态进行实时监测的可行性，研究了基于变压器励磁电流补偿法和消去法的两种短路电抗在线测量方法的原理，推导了计算公式。动模实验在线测量结果与离线短路实验结果的比较表明了两种方法的正确性和有效性。

The short-circuit reactance is an important parameter to characterize the transformer ability to resist the attack of short- circuit current in the design the operation process. In this paper, the on-line measuring method for short-circuit reactance based on electrical parameters＇ characteristics was presented, and the feasibility to carry out on-line monitoring for the transformer operation condition was also analyzed. Besides, the principle of two on-line measuring methods based on respectively exciting current compensation and elimination technique was researched, and the calculation equations were deduced. The comparison between the on-line results measured from moving mold experiment and those from off-line short-circuit experiment showed that these two methods were accurate and valid.