| Title |
Effect of Harmonics on Residual Current Protective Devices |
| Authors |
Jeong-Chay Jeon ; Sang-Ick Lee ; Jae-Geun Yoo |
| Keywords |
Malfunction ; Residual current circuit breakers ; Harmonic ; Nuisance tripping |
| Abstract |
Tripping of residual current protective devices(RCPDs) caused by harmonics has been continuously reported, but no literature is available on the behavior of RCPDs caused by harmonics. This paper, in order to find out the effects of harmonics on RCPDs, investigated the present condition on malfunction of RCPDs and measured harmonics at buildings where nuisance tripping of RCPDs was often occurred. Also, the operational characteristics of RCPDs were tested by the harmonics synthesizer that can generate distorted waveform. Results of experiment detected that there was minimum tripping current of RCPDs when third harmonic added to the fundamental frequency. And it was found that the leakage current to cause tripping of RCPDs increased with more higher order harmonics added to the fundamental frequency. |