电工速算口诀（An electricians quick calculation）.docVIP

电工速算口诀（An electricians quick calculation） An electricians quick calculation * known transformer capacity, the rated current of each voltage grade Formula a: The capacity is the voltage value, and its quotient is 10. Description: applicable to any voltage grade. In daily work, some electricians only involve a voltage rating of one or two types of transformer rated current. To simplify the above formula, the formula of calculating the rated current of each voltage level can be deduced: The capacity factor is multiplied. The capacity of the transformer is known as the current value of the first and second protection of the fuse block (commonly known as fuse). Formula b: The voltage of the transformer is compared with that of the transformer. With a low pressure melt, the capacity is 9 and 5. Description: It is very important to choose the safe operation of the transformer. The correct selection of melt is more important when the transformer is only used for high and low voltage side protection. This is a problem that electricians often encounter and solve. The capacity of three-phase motor is known to be rated current Formula c: The capacity is the number of kilovolts, the quotient point is seven six. Description: (1) the formula is applicable to the rated current of three phase motors of any voltage grade. By the formula and the formula can explain different capacity of the same voltage grade of the rated current of the motor is not the same, namely the kv voltage number, remove in the same capacity, the quotient is obviously not the same, is not the same quotient to take the same coefficient of 0.76, the current value is not the same. If the above formula is called the general formula, it can be deduced to calculate 220, 380, 660, 3.6 kV voltage and the rated current of the motor is special calculation formula, with a special calculation formula to calculate the rated current of a three-phase motor, kw direct relations with current ampere capacity multiples, eliminat