Abstract
The ultra-high voltage direct current (UHVDC) converter station is the core of the UHVDC project to realize the mutual conversion of alternating current (AC) and direct current (DC). Its operational reliability directly affects the safety of personnel and equipment and the stable operation of the grid. The firestop system is key part of the protective system in converter station, and it faces the threat of fire and explosion of converter transformer. In this paper, in order to improve the safety performance of the firestop system of the valve hall of the existing converter station, the blast resistant design target of the firestop structure and a fireproof and blast resistant strengthening scheme are proposed; For a typical UHV converter station, the dynamic response process under different explosion conditions is further analyzed by numerical model. The results show that the strengthening scheme proposed in this paper can effectively meet the requirements of blast resistant design targets, and greatly improve the safety performance of the firestop system of the valve hall of the converter station under fire and explosion.
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