发电机失磁保护中转子低电压二判据的比较

Comparison of the two criteria of rotor low voltage in the generator loss-of-field protection

介绍了国产30万kW发电机失磁保护励磁电压判据的两种构成方式及其原理,并加以比较。姚电公司在2001—2002跨年度大修中对#1机发—变组保护进行了更新改造,在试验中发现其失磁保护励磁电压判据有缺陷,依据分析结果对其进行了改进。

This paper presents two kinds of formingmodes and principle of exciting voltage criterion in chinamade 300MW generator loss-of-field protection,which were compared. The protection system of the generatortransformer set was renovated and rebuilt in the overhaul of the No.1unit of Yaomeng Power Co.Ltd. in the 20012002 during which the defects in the exciting voltage criterion of lossoffield protection were found in experiments,and were improved according to results of analysis .