谐波对漏电保护装置的误动影响研究

漏电保护装置是低压系统保证人身安全的重要设备,但由于谐波、冲击电流、三相不平衡负荷等因素的影响,导致目前存在装置频繁误动和投运率较低的问题.在理论分析的基础上,通过MATLAB仿真论证了谐波对漏电保护装置的误动影响.研究结果表明,系统三相负荷不平衡度越大,谐波对漏电保护装置的误动影响越大.在此基础上,提出了采用滤波器消...

Research on the malfunction of residual current protective device arose by harmonic

The residual current protective device is an important equipment to ensure personal safety in low voltage system,however,as the impact of harmonics,impulse current,three-phase unbalanced load,leading to the problem of the frequent malfunction of device and low operation rate.In this paper,based on the theoretical analysis,demonstrated the impact of harmonic on the malfunction of residual current protective device by MATLAB simulation.The result shows that the larger three-phase unbalanced load,the greater impact of harmonic to the malfunction of RCD.Proposed corresponding solutions on this basis,such as the use of filter to eliminate the third harmonic and reduce the three-phase load imbalance.The conclusion has important reference value to the development of new type of residual current protective device.