站内流经变压器套管的短路电流计算分析

Calculation Analysis of Short-circuit Current of Transformer Bushing in Power Stations

变电站内流经变压器套管最大短路电流计算是变压器抗短路能力校核的重要依据。如果变电站内有多台变压器,受互联变压器运行方式多样性的影响,多台变压器并列运行下如何计算单台变压器低压侧三相短路时流经其套管的最大短路电流,成为现场运维人员分析的难点。从单台变压器短路电流计算出发,对多台变压器并列运行下6种运行方式进行了计算,并在此基础上分析了不同运行方式的应用情况,为后期站内流经套管最大短路电流计算提供参考。

The calculation of the maximum short-circuit current of the transformer bushing in the substation is an important basis for the checking of the transformer's anti-short-circuit ability.If there are many transformers in the substation,which are affected by the diversity of the operation modes of the interconnected transformers,it becomes difficult for the field operation and maintenance personnel to analyze how to calculate the maximum short-circuit current when the three-phase short-circuit occurs in the low-voltage side of a single transformer under the parallel operation of multiple transformers.Based on the calculation of short-circuit current of a single transformer,six operation modes under parallel operation of multiple transformers are calculated.The application of different operation modes is also analyzed,and the reference for the calculation of the maximum short-circuit current of the bushing in the later power stations is provided.