Application of Is-Limiter for Transmission Systems

• Main Authors: Wen-Hsiang Yang, 楊文祥
• Other Authors: 李清吟
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/ya6mrv

碩士 === 國立臺北科技大學 === 電機工程系所 === 96 === Recently the disperser, as power joins the system operation, made the power system''s capacity increase gradually. The relative power system short-circuits capacity increased, which creates the security problem of the transmission line and the protection device, normally with predictable effects. The instantaneous fault current will be able to cause the damage to the transmission line and the switching equipment. This is a highly complex issue. Therefore, the fault current is an urgent issue for the research on fault current limiters. In this investigation, Is-Limiter is proposed to solve the problem of the gradual increase in short-circuit capacity of the power system. Because Is-Limiter itself is provided with a fault current limiter and circuit breaker function, when a limited fault current within a certain value was set up, the instantaneous fault current achieved this certain value, it rapidly cut the breakdown spot from the system. The fault current was never able to achieve the maximum value, and the magnitude of the fault current was as expected. Therefore, the transmission line and the protection device work safely and the power system operation security is efficient. The goal of this investigation is to utilize the Matlab/Simulink to construct the Is-Limiter, work on the power system in Penghu, making a dynamic simulation. When a three-phase short-circuit fault occurred in the power system, to study the voltage transient response difference between using Is-Limiter and using circuit breaker on load side at 11.4kV and the transformer substation side at 69kV respectively, The investigation showed that Is-Limiter truly can limit the fault current from the maximum value and can quickly cut off the fault than the general fault current limiter. Meanwhile, Is-Limiter may improve while a three-phase short-circuit fault caused the voltage to plummet.