Transformer neutral point protection is critical for system stability. Zero-sequence current protection acts as a backup for internal faults and adjacent ground faults. Its configuration depends on the grounding status. When the neutral is directly grounded, a two-stage overcurrent scheme is used: s

In the field of power equipment manufacturing, the fraudulent practice of using "aluminum instead of copper" in transformers is becoming a serious threat to public safety and industry reputation. This phenomenon refers to manufacturers illegally substituting high-conductivity copper windings with al

Oil-immersed transformers are widely used in substations for their cost-effectiveness, superior heat dissipation, and insulation properties. However, they carry a significant risk: the cooling oil is highly flammable. To mitigate fire and environmental hazards, a thick layer of gravel is strategical