PSoC를 이용한 중성점저항접지 모니터에 관한 연구

Abstract

상기 논문은 중성점접지저항을 이용한 모니터 시스템을 PSoC을 이용하여 구현 하였다. PSoC을 이용하여 중성점접지저항(NGR) 양단의 전압과 중성점에 흐르는 전류를 검출하여 접지지락 과 저항지락에 대한 판단을 하고 릴레이를 구동시켜 전력시스템을 보호하는 한 방법을 제안하였다. 실험을 통하여 그 타당성을 입증 하였으며, 저전압을 사용하는 산업현장의 전력계통에 적용이 가능한 것으로 사료됨.

The independent and neutral resistance ground system can be applied to the industrial plant that are consuming high voltage electric power from using through electric supply transformer. Ground fault accident menaces the stability of the electric power system and brings the damage and shock to the associated machine. The strong points of the neutral resistance ground connection method is the restriction to be able to reduce the system shock. Also it can suppress the over voltage occurrence and guarantee the detection of the ground fault current and the operation of the protection relay when ground fault accident occur. A Neural Grounding Resistor(NGR) limits ground fault currents in local distribution systems. This application packs a PSoC with functions to protect against an unhealthy NGR and too high fault currents. Simulation and experiment results proved the excellence of the proposed method in this paper.