Shielding effect of multi-grounded neutral wire in the distribution system

摘要

The voltage induced by the power line on the nearby conductors, like telephone lines and pipelines, isninvestigated in this paper. The relationship between the phase currents and the neutral current plays annimportant role in reducing the induced voltage. Firstly, the impact of the MGN (multi-grounded neutral)nconfigurations on the induced voltage is analyzed. It is found that the MGN-I (Islanded MGN) is the mostnpractical configuration to reduce the induced voltage. Then a new method to calculate the neutral current fornMGN-I is proposed. Based on the proposed method, a series of charts for neutral wire selections are given tonfacilitate the field engineers select the proper neutral wire. Finally, the validation of the proposed method isnverified by the results obtained from EMTP-based multiphase harmonic load flow (MHLF) program.nCopyright # 2010 John Wiley & Sons, Ltd.