以新的虚拟物理量E_(t·q)、E_(fq·q)为判据的新型计算机失磁保护

A NEW MICROCOMPUTER-BASED LOSS-OF-EXCITATION PROTECTION WHICH TAKES E_(t·q)AND Ef_(q·q)AS CRITERION

本文以同步电势判据为基础,推导出新的虚拟物理量——“强制同步电势分量”E_(ts.q)(“强制空载电势分量”E_(fq.q)与之类似)。文章分析论证了E_(t.q)的重要特点(E_(fq.q)类似),并根据E_(t.q)、E_(fq.q)的特点构成了全新的具有“瞬时”及快速检测失磁故障特性的两段式计算机失磁保护。给出了保护的原理框图及用微机实现的硬件结构框图。并简要叙述了数字仿真及动模试验的结果。

This Paper introduces the idea of two new fictitious electric potentials——E_(?.q) and E_(fq.q), and develops a new microcomputer based loss-of-excitation protection which takes E_(t.q) and E_(fq.q) as the criterion. Results of digital simulation and dynamic model test of the protection are presented.