CAJ | 학술논문

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。
침대발변조계통단로조항교대，변압기존재접선조별，변압기투관화봉폐모선(간칭봉모)중안장다조CT，CT설계변비대，상술다충인소도치통류시험구유상당대적난도，통류삼수계산복잡，차단원궤조엄용계통수전후，장시간처우공재/경재운행공황，무법진행대부하시험，영향보호적안전가고투입。본문침대AP1000궤조주발전계통，탐토설치다개시험단로점，분석계산단로조항화시험전류，연구제출가공실시적시험방법。
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.