三绕组高阻抗变压器的短路阻抗计算
陈伯根
（福州天宇电气股份有限公司，福建 福州 350012）
摘 要：介绍了三绕组高阻抗电力变压器的短路阻抗的计算方法、典型的绕组布置情况和不同运行方式。给出了各种运行方式下的等值漏磁空道面积的变化情况和计算方法，并推导出了漏磁通分为方向相反的两部分时的等值漏磁空道面积计算的新方法，指出了三绕组高阻抗变压器在极限分接运行时的短路阻抗和额定短路阻抗的变化关系。将计算结果与试验值进行比较，偏差都小于2%，说明计算公式符合工程计算要求。
关键词：三绕组高阻抗变压器；短路阻抗；等值漏磁空道面积
中图分类号：TM426 文献标识码：A 文章编号：1007-3175(2018)02-0027-06
Short Circuit Impedance Calculation of Three-Winding High Impedance Transformer
CHEN Bo-gen
（Fuzhou Tianyu Electric Co., Ltd, Fuzhou 350012, China）
Abstract: Introduction was made to the calculation method of short-circuit impedance, the typical winding arrangement and different operation modes of the three-winding high impedance transformer. This paper gave the change and calculation method of the equivalent magnetic flux leakage path area under various modes of operation and inferred a new method for calculating the equivalent magnetic flux leakage path area when the magnetic flux leakage was divided into two parts with opposite directions, pointing out the relationship between short-circuit impedance and the rated short-circuit impedance of the three-winding high impedance transformer during the limit tap operation. The computed result was compared with the experimental value and the deviation was less that 2%, which shows that the computational formula conforms to the requirements of engineering calculation.
Key words: three-winding high impedance transformer; short circuit impedance; equivalent magnetic flux leakage path area
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