国外220kV差动保护的特点原理分析

The theoretical analysis of the characteristic of a 220kV overseas differential protection

根据国外微机差动保护在绍兴电力局的应用情况 ,以西门子 7UT5 1系列差动保护为例 ,着重分析其电流相位调整、零序电流处理、二次谐波交叉制动以及TA饱和附加制动的原理和方法 ,并推导出西门子没有给出的Y(N)d11接线变压器的相位匹配方程。

Basing on the application of 7UT51 differential protection of Siemens company in Shaoxing Power Bureau, this paper analyzes the principle of current phase adjustment, zero_sequence_current processing, 2nd harmonic cross_blocking and CT saturation restraint, and also derives phase_matching equation of Y(N)d11 connections.