An Improvement of ST Generator for Trip due to Grid Voltage Sag

T.P. Tsao and C.C. Ning (Taiwan)



This paper is an improvement project of Nan-Pu combined cycle power plant, which located in Kaoshiung of Taiwan. As long as transient outage of power system in southern Taiwan, the steam turbine generator trip but gas turbine generator keep running. The outages had occurred several times since commercial synchronization; three times happen only from January to June in 2001. Consequently, we find that the settings of overcurret protection relay of excitation transformer were improper by means of investigation and comparison with the other plant. By modifying the relay settings, this defect was already improved fully. The project not only improve working achievement, but also enhance transient stability of overall power system in Taiwan.

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