With the Pubugou huge hydraulic generator as an example

this paper analyzes all the faults that may occur in the stator. By employing the simplified transient simulation model of the internal fault based on dual-damper-under-each-pole

the protection results of different protection theories of different stator branch connection types on the neutral side are analyzed

and the optimized main protection scheme for the Pubugou generator is proposed

providing reference for relevant engineering application and research work.