基于序分量法的V/V接线牵引变压器实用快速短路计算方法

摘要

三相V/V接线变压器在电铁牵引系统中得到广泛应用,然而V/V接线变压器结构相对于三相系统具有严重的不对称性,这给现有的以对称序分量为基础的电力系统整定计算带来困难.通过对V/V接线变压器的接线方式及其等效模型进行深入分析,提出了基于序分量法的实用故障计算方法,给出了各种故障类型的序分量图及计算公式.并与基于分相法的故障计算方法进行比较研究,结合算例验证了此方法的有效性.将其与现行输电网故障计算程序相结合,对现有故障计算程序的复杂故障计算模块略作调整,即可对V/V接线变压器故障进行快速计算,从而形成了一种广泛实用的计算方法.%V/V structure transformer has been widely used in the electric railway traction system. However, the construction of V/V transformer compared to three-phase system has a serious asymmetry. It brings new difficulty to the existing setting calculation of power system which is based on symmetrical sequence components. By analyzing in-depth the connection mode and equivalent model of V/V structure transformer, a new practical fault calculation method based on sequence component is proposed, and interconnection of sequence networks and formulas for a variety of fault types are given. Compared with the fault calculation method based on phase component model, an example is given to prove its practicability and validity. Combined it with the existing transmission network fault calculation procedures, based on slight adjustments of the complex fault calculation module of the existing fault calculation procedure, the fault of V/V structure traction transformer can be rapidly calculated and a practical calculation method can be developed.