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A new MV bus transfer scheme for nuclear power plants

Fast bus transfer method is the most popular and residual voltage transfer method that is used as a backup in medium voltage buses in general. The use of the advanced technology like open circuit voltage prediction and digital signal processing algorithms can improve the reliability of fast transfer scheme. | A new MV bus transfer scheme for nuclear power plants EPJ Nuclear Sci. Technol. 1 12 2015 Nuclear Sciences C.-K. Chang published by EDP Sciences 2015 amp Technologies DOI 10.1051 epjn e2015-50003-1 Available online at http www.epj-n.org REGULAR ARTICLE A new MV bus transfer scheme for nuclear power plants Choong-Koo Chang Department of NPP Engineering KEPCO International Nuclear Graduate School KINGS Ulsan Korea Received 29 April 2015 Received in final form 2 September 2015 Accepted 12 October 2015 Published online 09 December 2015 Abstract. Fast bus transfer method is the most popular and residual voltage transfer method that is used as a backup in medium voltage buses in general. The use of the advanced technology like open circuit voltage prediction and digital signal processing algorithms can improve the reliability of fast transfer scheme. However according to the survey results of the recent operation records in nuclear power plants there were many instances where the fast transfer scheme has failed. To assure bus transfer in any conditions and circumstances uninterruptible bus transfer scheme utilizing the state of the art medium voltage UPS is discussed and elaborated. 1 Introduction operation for the normal operation of the reactor in pressurized water reactors. If any one 1 of four 4 pumps The auxiliary power system of many generating stations is inoperable then the operation mode should be changed to consists of offsite power supply system and onsite power the hot standby mode from normal operation mode. It supply system including emergency diesel generators EDG means that the fast transfer is essential to the RCP motor to provide secure power to auxiliary loads. If a normal power buses Divisions I and II to maintain reactor operation. supply fails to supply power then the power source is Typical transfer time of the fast transfer is 4 to 9 cycles. If transferred to a standby power supply. In the case of nuclear both of the RCP motor buses fail to .