20151121 One Question per Day
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20151121 Daily Question: The rewards are as follows: 1-3 points for participation, 5 points for a correct answer, and 10 points for a correct answer accompanied by an analysis. In load calculation, single-phase loads should be distributed evenly across the three phases; when the total capacity of single-phase loads is less than ( ) of the total capacity of the symmetrical three-phase loads within the calculation range, the calculation is carried out as if it were symmetrical three-phase loads. A. 15% B. 20% C. 25% D. 30% The answer is A
A, 15%. ----------------------------------------------
In load calculation, single-phase loads should be evenly distributed across the three phases. When the total capacity of the single-phase loads is less than (A) of the total capacity of the symmetrical three-phase loads within the calculation range, the calculation is carried out as if it were symmetrical three-phase loads. 08 Civil Code: 3.5.5 Single-phase loads should be evenly distributed among the three phases. When the total calculated capacity of single-phase loads is less than 15% of the total calculated capacity of the symmetrical three-phase loads within the considered range, they should all be treated as symmetrical three-phase loads ； When it exceeds 15%, the single-phase load should be converted to an equivalent three-phase load, which is then added to the three-phase load. The book \"Power Supply to Factories\" (by Liu Jiecai) states that if the total capacity of single-phase equipment in a three-phase circuit does not exceed 15% of the total capacity of the three-phase equipment, then regardless of how the single-phase equipment is distributed, it can be combined with the three-phase equipment and calculated based on three-phase load balance. If the capacity of single-phase equipment exceeds 15% of the capacity of three-phase equipment, then the capacity of the single-phase equipment should be converted into an equivalent three-phase capacity, which is then added to the capacity of the three-phase equipment. For example. When the total calculated capacity of single-phase loads is less than 15% of the total calculated capacity of three-phase symmetric loads within the considered range, all loads should be calculated as three-phase symmetric loads. For example, if the single-phase loads are L1: 2KW and L2: 0.5KW, while the three-phase load is 20KW (20KW x 15% = 3KW), then 2 + 0.5 = 2.5; the total load would therefore be 4KW x 3 (the maximum phase value multiplied by 3) + 20 = 32KW. (The maximum single-phase load value x3 must be calculated first, and then added to the three-phase load.)
In load calculation, single-phase loads should be evenly distributed across the three phases. When the total capacity of the single-phase loads is less than (A) of the total capacity of the symmetrical three-phase loads within the calculation range, the calculation is carried out as if it were symmetrical three-phase loads.
In load calculation, single-phase loads should be evenly distributed among the three phases. When the total capacity of the single-phase loads is less than (a) of the total capacity of the symmetrical three-phase loads within the calculation range, the calculation is carried out as if it were symmetrical three-phase loads. A.15%
Answer: A. Civil code: 3.5.5 Single-phase loads should be evenly distributed across the three phases. When the total calculated capacity of the single-phase loads is less than 15% of the total calculated capacity of the symmetrical three-phase loads within the considered range, it should be calculated as if it were a symmetrical three-phase load； When it exceeds 15%, the single-phase load should be converted into an equivalent three-phase load, which is then added to the three-phase load.
A. 15%! ! ! ! ! ! ! ! ! ! ! !