AP1000核电发–变组短路阻抗法通流试验研究

Research on the Injection Current Test of AP1000 Nuclear Power Generator Transformer Unit Based on Short-circuit Impedance Method

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。

Because of its high short-circuit impedance of generator-transformer unit, there are different connection groups of the transformer, many current transformers (CT) which ratio is very large are installed in the transformer bushing and enclosed buses, it is very difficult to perform injection current test and calculate the injection current parameters. After energizing the auxiliary power system, it operates with small load or no-load for a long time, in that case it is impossible to perform the load test and that influences the safety and reliability for the relay protection. According to the main power generation system(ZAS) of AP1000 unit, setting different short circuit points is discussed, the short-circuit impedance and test current are analyzed and calculated, and the test method that can be implemented is put forward.