波波里水电站励磁系统选型设计

Type Selection Design of Excitation System for Gribo-Popoli Hydropower Station

本文通过分析直流侧短路电流特点,提出快速熔断器分断容量应按空载误强励状态下励磁变低压侧三相短路电流来计算的思路;理论上推导了快速熔断器的I2t值和灭磁电阻能容量值的计算公式。通过这些理论上的分析和推导,使励磁系统元器件选型计算公式更易懂、更科学、更实用,进一步提高了励磁系统运行的可靠性。可为类似水电站励磁系统设计提供参考。

By analyzing the characteristics of short circuit current at DC side,this paper proposes that the breaking capacity of fast fuse should be calculated according to the three-phase short circuit current at low voltage side of excitation transformer under no-load false forced excitation.The calculation formulas of I2t value and de-excitation resistance energy capacity value of fast fuse are deduced theoretically.Through these theoretical analysis and derivation,the calculation formula of excitation system component selection is more understandable,scientific and practical,and the reliability of excitation system operation is further improved.It can provide reference for excitation system design of similar hydropower stations.