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Basic working principle of longitudinal differential protection of generator

 
       1.Longitudinal differential protection of the role of the 
 
       generator stator winding and its lead-out short-circuit, is the main protection of the generator. 
 
       2. The basic principle of longitudinal differential protection 
 
       compares the size and phase of the current on both sides of the generator, which is a phase fault that reflects the generator and its lead. Generator longitudinal differential protection structure on both sides of the current transformer with the ratio, the same model.
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Figure 1 Schematic diagram of longitudinal differential
 
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Figure 2 Normal operation and external fault principle and current formula
 
 
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Figure 3 internal fault principle and current formula
 
 
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