The rated current of 1000KVA/ 10KV transformer high voltage side is 57.7A, and only a small cross-sectional area is needed according to current calculation. However, considering the dynamic thermal stability check, if the fault level of 10KV bus is 3 1.5KA, the cable should be at least 70mm2, and the transformer does not need a neutral wire. If it is not directly buried (cable trench bridge), 32)-6/10 (8.7/15) 3 * 70mm2 is enough. In brackets are armored buried cables and high insulation grade configurations.