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http://dx.doi.org/10.5370/KIEE.2017.66.10.1466

A Study on Out-of-Step Relay Operation due to Delayed Fault Clearing in Transmission Line  

Park, Ji-Kyung (Dept. of Information and Communication Engineering, Sungkyunkwan University)
Kim, Kwang-Hyun (Dept. of Information and Communication Engineering, Sungkyunkwan University)
Kim, Chul-Hwan (Dept. of Information and Communication Engineering, Sungkyunkwan University)
Lyu, Young-Sik (Korea Power eXchange)
Yang, Jeong-Jae (Korea Power eXchange)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.66, no.10, 2017 , pp. 1466-1473 More about this Journal
Abstract
Generally, electrical torque in synchronous generator is balanced with the rotor mechanical torque under steady-state condition. Thus, the synchronous generator rotor rotates at constant speed. However, under fault condition, the electrical torque output is suddenly decreased and the sum of both torques does not remain constant. If the mechanical torque is not decreased at the same time, the generator rotor would accelerate. Therefore, this accelerating generator rotates at different speeds with respect to other generators in the power system. This phenomena is called as Out-of-Step (OOS). In this paper, we presented a certain two-step type quadrilateral OOS relay setting, which is applicable in actual field, and examined the validity of its setting value with OOS simulation conditions due to delayed fault clearing in transmission line. In order to conduct the study of OOS relay characteristics, we checked the impedance locus and generator output characteristics under the various delayed fault clearing conditions. Moreover, we proposed a countermeasure for avoiding the misoperation of OOS relay during the stable swing by modifying the setting values.
Keywords
Delayed fault clearing; Generator protection system; Generator Out-of-Step; Two-Step double blinder Out-of-Step relay operation;
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