This paper takes a SFPS28-120000/220 transformer as an example. By analyzing its iron yoke clamping structure, a method for calculating the multi-point grounding current when the iron core hits the clamp is proposed. The multi-point grounding current when the fault grounding point is located at different positions is calculated, and its change law is analyzed, which provides a theoretical basis for further diagnosis and analysis of iron core multi-point grounding faults.
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