大化肥配电网零线断线的危害及预防措施

Damage from Breakage of Zero Line on Distribution Network In Large Chemical Fertilizer Plant and Precaution Against It

分析了在低压（400）配电网中,由于零线截面过小、不平衡电流大造成零线过负荷导致零线烧断,施工中存在不按规定施工使零线接头连接不好而过热烧断,配电网年久失修,线路老化在外部条件变化时引起零线断线。阐述了防止零线断线或万一零线断线后所采取的保护措施。

The paper analyses the three causes for breakage of zero line in low voltage (400) distribution network caused by over load from strong unbalance currency through over small section,over heat from poor connection in construction and aging from nonmaintenance for a long time in so three ways. Then it presents the precaution against breakage or countermeasures in the case of breakage occurrence in seven ways.