Generally speaking, the short-circuit current of three-phase short-circuit is the most serious and harmful, so the key of short-circuit current calculation is the calculation of three-phase short-circuit current. According to the short-circuit current calculation based on three-phase short-circuit, the maximum short-circuit current has three calculation points, namely, 100kV bus short-circuit (K1 point), 10kV bus short-circuit (K2 point), 0.4kV bus short-circuit (K3 point).<br>
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