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# If calculating the current on the high and low side of the distribution transformer

###### ZTELEC Insulation Materials | 18-10-29

The distribution transformer is used as an electrical device and its current value is also an important parameter. So today ZTELEC teaches you how to calculate the high voltage and low voltage side current of the transformer.
1. Fast estimation method
Oil-immersed distribution transformer capacity / 100, take an integral multiple, then * 5.5 = high-side current value, if it is * 144, is the low-side current value
For example, a transformer with a capacity of 1000KVA, /100 takes an integral multiple of 10, then the high-side current value is 10*5.5=55A, and the low-voltage side current value is 10*144=1440A.
2, linear coefficient method
Remember the high and low voltage side current values ​​of a dry distribution transformer with a common capacity. Other capacity can be linearly derived.
For example, a transformer with a capacity of 1000KVA, the calculated value of the high-side current is 57.73A, and the calculated value of the low-side current is 1443.42A;
Then remember this data, other capacity can be derived from this
For example, a 1600KVA distribution transformer, the high-side current is (1600/1000) * 57.73 = 92.368A, the low-voltage side current is (1600 / 1000) * 14443.42 = 2309.427A.
3. Rough estimation method
High side current = transformer capacity / 20, low side current = transformer capacity * 2
For example, 1000KVA transformer, high-voltage side current = 1000/20 = 50A, low-voltage side current = 1000 * 2 = 2000A, this method is too rough, generally used by the design institute for switching element type selection, cable selection and calibration Common methods used in the test
4, formula calculation method
Formula: I=S/1.732/U
I–current, unit A; S–transformer capacity, unit kVA; U–voltage, unit kV Ztelec Group