摘要
介绍了一种适合 EMTP仿真程序的变压器模型 ,该模型能模拟变压器各种匝间短路和绕组对地短路 ;结合传统的比率制动式差动保护 ,提出了基于模糊集合理论的变压器匝间短路保护新算法 ,利用隶属函数使得制动系数能根据变压器不同的运行工况作出相应的调整。仿真结果表明该算法具有很大的灵活性和自适应性 ,既保证了在区外故障时有足够的可靠性 。
A transformer model compatible with the Electromagnetic Transients Program (EMTP) is presented, which can be used to simulate the turn to turn fault as well as also turn to ground fault. Integrated with conventional differential protection, a new algorithm based on fuzzy set theory is put forward in this paper. With the membership functions of the fuzzy sets, the restraint coefficient can be adjusted correspondingly according to the operating condition of the transformer. Simulation results show that this algorithm is adaptive and flexible, which not only can ensure sufficient reliability under external fault, but also high sensitivity to internal turn to turn short circuit fault.
出处
《电网技术》
EI
CSCD
北大核心
2002年第1期11-14,共4页
Power System Technology
