सामान्य परिस्थितियों में, काम कर रहे system of electrical equipment, generally divided into continuous operation, short-term operation, continuous short-term operation system, The principle of भार हिसाब is to replace the rated power of electrical equipment under different काम कर रहे systems with the same long-term working system. The हिसाब of distribution transformer load is a complicated process, therefore, it needs a lot of calculation and repeated verification by professional staff, in order to get the correct calculation results.