| Title |
A Study on Algorithm of A-Type Earth Leakage Circuit Breaker with High-Reliability using Harmonic Ratio |
| Authors |
정현영(Hyun-Young Jung) ; 박진영(Jin-Young Park) ; 안길영(Kil-Young Ahn) ; 홍종필(Jong-Phil Hong) |
| DOI |
https://doi.org/10.5370/KIEE.2023.72.1.145 |
| Keywords |
A-Type Earth Leakage Circuit Breaker; Fourier Transform; Pulsating Direct Leakage Current; Zero Phase Current Transformer |
| Abstract |
In this paper, we propose an algorithm with high-reliability for A-Type leakage current detection by applying a Fourier transform. In this study, Fourier transforms were used to improve the reliability of distinguishing between A-type leakage currents and normal currents due to ZCT saturation. The components of each current waveform were analyzed and verified in the frequency domain, and an algorithm using the content of the third harmonic compared to the fundamental was applied. By applying the proposed algorithm, high-reliability were secured compared to the operation of the existing analog A-Type earth leakage circuit breaker. |