500kV输电线路中直流断路器工作条件的计算

Analysis and calculation of operating conditions of HVDCCB and MRTB in Gezhouba-Shanghai 500 kV HVDC transmission line

以我国第一条±５００ ｋＶ葛州坝至上海超高压直流输电线路为模型，运用电磁暂态计算程序ＥＭＴＰ．对开断直流线路过程中高压直流断路器的工作条件进行了计算，分析了系统参数对断路器工作条件的影响，确定出在最严重情况下，即Ｉ＝４ｋＡ时葛－上线开断过程中吸能装置耗散能量达１５．７ＭＪ，通流时间为１１．６ｍｓ。同时计算分析了金属回线转移开关ＭＲＴＢ开断过程中直流断路器的工作条件，并与线路用宜流断路器一断口的情况进行比较，提出了首先发展ＭＲＴＢ的研究方向。

In this paper, the analysis and calculation of operating conditions of HVDCCB and metallic return transfer breaker (MRTB) during interrupting process in Gezhouba-Shanghai HVDC transmission line have been made with the Electro-Magnetic Transients Program (EMTP). The influence on energy absorber which is made by the system inductance and interrupting current is analysed. In the most serious situation, when I = 4kA, the dissipated energy in energy absorber is 15.1 MJ, and the current duration is 11.6 ms. At the same time, the comparison of operating conditions between HVDCCB and MRTB is made.