Overview of Low Voltage IT System with the Neutral Conductor

After the application of IT system being described briefly, operating characteristics and constraints of IT system with the neutral conductor are expounded. The feasibility of the neutral conductor in IT system is discussed in detail. Then the reason why insulation fault in N conductor can´t be diagnosed by traditional methods is explained, and the problem can be solved by the method of injecting external diagnostic signals. The first and second earth fault protection schemes are presented in the paper. Analysis shows that IT systems with the neutral conductor have excellent performances and deserve promotion.