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针对发变组系统短路阻抗较大,变压器存在接线组别,变压器套管和封闭母线(简称封母)中安装多组CT,CT设计变比大,上述多种因素导致通流试验具有相当大的难度,通流参数计算复杂,且单元机组厂用系统受电后,长时间处于空载/轻载运行工况,无法进行带负荷试验,影响保护的安全可靠投入。本文针对AP1000机组主发电系统,探讨设置多个试验短路点,分析计算短路阻抗和试验电流,研究提出可供实施的试验方法。
For a large transformer system short-circuit impedance, transformer wiring group exists, the transformer casing and the enclosed busbar installed multiple sets of CT, CT design larger than the variety of factors lead to the flow test is quite large The difficulty of calculation and the calculation of the flow parameters are complex. After the unit system of the unit is powered on for a long period of time, it is in the no-load / light-load operation condition and can not carry the load test, thus affecting the safety and reliability of the input. In this paper, aiming at the main power generation system of AP1000 unit, several test short-circuit points are discussed, and the short-circuit impedance and test current are analyzed and calculated. The test methods that can be implemented are put forward.