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1. Calculation of high and low voltage side current, transformer capacity/voltage level/1.732*rated current
For example: Transformer capacity is 1000kVA
High voltage side current: 1000/10/1.732=57.736A
Low voltage side current: 1000/0.4/1.732=1443.418A
2. Calculation of the protection setting on the high voltage side of the transformer:
For example: the capacity of the transformer is 1000kVA, and the known high voltage side current of the transformer is 57.736A
Select the current mutual inductance of 100/5, the magnification is 20 times, the calculation method of the secondary side current: 57.736/20=2.8868A
Note: The consideration of the secondary rated multiple is determined by the size, length and nature of the load of the cable. Generally, the minimum multiple is selected.
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