船舶中压电力系统中性点接地方式研究

Research on Neutral Grounding Method of Ship Medium Voltage Power System

安全可靠是船舶电力系统建造和运营最基本的要求,在船舶设计之初,首要考虑的就是电力系统的接地方式。对于大型船舶而言,中压电力系统的中性点接地方式更是一个复杂的系统问题,合理的选择中性点接地方式,关系到电网运行的可靠性和船员的生命安全。中性点接地方式分为中性点不接地系统和中性点接地系统两大类,基于船舶中压电力系统各接地方式的特点,从可靠性、安全性等角度对比分析各接地方式的优缺点,认为中性点不接地的方式是中压船舶的首选,符合商船的经济性、实用性。

Safety and reliability are the most basic requirements for construction and operation of a ship’s power system.At the beginning of a ship’s design,the primary consideration is the grounding method of the power system.For a large ship,the neutral point grounding method of medium voltage power system is a complex system issue.Reasonable selection of neutral point grounding method is related to the reliability of grid operation and the safety of crew’s lives.The neutral point grounding method is divided into two categories:neutral point ungrounded and grounding system.Based on the characteristics of various grounding methods of ship’s medium voltage power system,the advantages and disadvantages of each grounding method are compared and analyzed from the perspectives of reliability and safety.It concludes that the method that the neutral point is ungrounded is the first choice for a medium-voltage power ship,which is in line with the economic feature and practicality of merchant ships.