عام حالات میں، کام کر system of electrical equipment, generally divided into continuous operation, short-term operation, continuous short-term operation system, The principle of لوڈ حساب سے is to replace the rated power of electrical equipment under different کام کر systems with the same long-term working system. The حساب سے 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.