NDLI: Fast bus transfer scheme and its performance in nuclear power generating stations

Content Provider	IEEE Xplore Digital Library
Author	Trehan, N.K.
Copyright Year	2003
Description	Author affiliation: US Nucl. Regul. Comm., Rockville, MD, USA (Trehan, N.K.)
Abstract	During a cold start of the nuclear power generating station, Startup Transformers (SUT) energized from the switchyard provide power for recirculation pumps, feedwater pumps, condensate and condensate booster pumps in a Boiling Water Reactor (or reactor coolant pumps, circulating water pumps etc. in a Pressurized Water Reactor). When the reactor reaches rated pressure and temperature and 6-10 percent power, the main generator is synchronized to the grid and these loads are transferred manually to the Unit Auxiliary Transformer (UAT) energized by the main generator. On the trip of the turbine, the power to these loads is switched automatically back to the SUT. Without the provision of a fast transfer scheme (4 to 10 cycles) from UAT to the SUT, recovery from scram may be quite complex. The complexities that could result, including rendering the feedwater system inoperable. In the Sequential Fast Transfer Scheme an early 'bb' auxiliary contact of the UAT (normal source) breaker is used to initiate closing of the SUT breaker (alternate source). Bus dead time of 4 to 10 cycles is obtained. Some licensees use a voltage decay scheme (also called residual bus transfer scheme) as a backup to the fast transfer scheme. ANSI C50.41-1982, "Polyphase Induction Motors for Generating Stations," recommends that the power supply system be designed so that the resultant vectorial volts/hertz between at the instant the transfer or reclosing is completed does not exceed 1.33 per unit volts/hertz on the motor rated voltage and frequency bases. High speed sync-check relays or the use of the state of the art technology like a microprocessor based sync-check devices in a fast transfer scheme can improve the reliability of the auxiliary power distribution system.
Starting Page	1909
Ending Page	1913
File Size	461394
Page Count	5
File Format	PDF
ISBN	0780376366
DOI	10.1109/NSSMIC.2002.1239698
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-11-10
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Nuclear power generation Power generation Inductors Transformers Mesh generation Voltage Induction motors Power system reliability Coolants Temperature
Content Type	Text
Resource Type	Article

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