Generator Neutral Grounding Mode Of Choice

Through analyzing of every kinds of generator ground,introduces the concept and there have knowing of all kinds of generator grounding. Have studied generator ground model mostly used in detail for middle and big domestic generator units.Calculates and deduces fault current as grounding of single phase and third harmonic fault protection schemes. First time contributes overall knowledge about generator neutral grounding of distribution transformer with secondary resistor,in which considered inductance of the transformer to people. Brings out some new and different viewpoint on issues of transient and dynamic voltages for generator single phase fault as well as third harmonic fault protection.! Presents good references for engineering design and manufacture person who deal with the generator neutral ground.Because there is direct relation ship with fault currents and transient and dynamic voltages,in theory or practice,it is so complicated that the selection of generator neutral grounding model will affect or determine the generator protection scheme.In mode selection of middle and large capacity units nowadays,there mainly have two types of Peterson coil grounding and distribution transformer with resistor. By analyses and compares,the conclusion is that it would be better to choose high resistance grounding of distribution transformer for hydro turbine in hydro power station. There is no certain conclusion for steam turbine in fossil-fired power plant. Getting a clear answer to choose good generator grounding mode still needs practice and time.