Tank depressurisation

• Main Authors: Ahmed, Omar, Goj, Anne
• Format: Article in Journal/Newspaper
• Language: English
• Published: Merit Media Int. Ltd. 2014
• Subjects: tank depressurisation; transformer protector; pressure relief valve; computational fluid dynamics (CFD); Protector; Krasnoyarsk Krai
• Online Access: http://hrcak.srce.hr/185462; http://hrcak.srce.hr/file/273478

This paper analyses the activation of two mechanical depressurisation devices, the transformer protector (TP), a leading example of a fast tank depressurisation technique (FTDT) and the pressure relief valve (PRV) during an internal arc on a transformer installed at the JSC RusHydro Boguchanskaya Hydro Power Plant, located in Krasnoyarsk Krai, Russia. The incident occurred on a 400 MVA three phase transformer on the 3rd May, 2013. Using all the available data, including SCADA records, dissolved gas analysis and voltage/current measurements, computational simulations were performed to study the dynamic pressure evolution and static pressure build up inside the tank. Simulation results on tank protections were analysed in the context of general arcing events. This incident demonstrates that the frst dynamic pressure peak due to the arc quickly activates the FTDT, while the PRV activates with static pressure only.