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http://dx.doi.org/10.5370/KIEE.2012.61.3.367

Review on tolerance factors for 1E UVR setting at NPPs  

Moon, Su-Cheol (충남대 공과대학 전기공학과)
Kim, Kern-Joong (충남대 공과대학 전기공학과)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.61, no.3, 2012 , pp. 367-372 More about this Journal
Abstract
In nuclear plants, UVR (under voltage relay, 27r) of 1E bus, which protected and supplied power to essential loads, to safety trip of reactor and supplied to starting signal of EDG (emergency diesel generators) automatically. therefore UVR tolerances setting and calculation method has been important to nuclear facility. If calculation and tolerances values differ or ignore, may induced power loss and economical loss by protective failure. This paper show results for calculation methods, and whether dependant or independent methods for factors. included whether PT (potential transformer/voltage transformer) tolerance or not adapted, and based on UVR setting method within a difference minimum and maximum of rated voltage to safety operation in nuclear plants.
Keywords
UVR; PT; Tolerance factor; 1E; Dependant or independent;
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