- According to the provisions of Vietnam, 6 kV grid is a neutral grid isolation (IT).
- Two secondary coil of the transformer required wiring structure triangles () aims to eliminate the harmonics Higher heating source to reduce the transformer.
- The FLS require two secondary coils of the transformer football star (Y) with grounded neutral through resistor (TN-S) will also affect the design Current lines.
- So can not change the design as required by FLS are
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