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Calculation and selection of residential power transformer capacity

Fan xianmin

The calculation of transformer capacity selection conforms to the conventional calculation method; It is the total design capacity of residential users in a residential area and the sum of one household's capacity. Because residential electricity consumption is single-phase, we need to convert this figure into three-phase four-wire electricity consumption. Then, the relationship between phase current and line current is the problem of root number 3, that is, the sum of this single-phase power divided by 1.732 is converted into three-phase four-wire power. For example, there is a community with 200 households and 6 households. The sum of one household is 1400÷ 1.732 ≈ 808KW, which is the maximum power when all the electrical appliances in the community are used at the same time, and this will not happen in actual use. Then a power consumption rate is generated, which is generally 70-80%, and this power consumption rate is based on the user structure characteristics of the community. But according to the economic operation value of the transformer is 75%, then we can cancel these two values and calculate the capacity of the transformer according to this power. Then the capacity of this transformer is the total power 1400÷ 1.732≈808KW, and the power factor is now 0.85-0.9 depending on the electricity consumption of residents. How can we work it out? First, the total power of 1400 is divided into three lines, that is, single-phase power, 1400÷3=467KW. Then, this single-phase power is converted into three-phase power, 467× 1.732 ≈ 808KW, divided by the power factor of 0.85.

According to the standard capacity of transformers in this data set, it is suggested to select two transformers with a total capacity of 945KVA, one with a total capacity of 630KVA and the other with a total capacity of 3 15 kVA, which can be put into use in batches in the actual construction process. Considering the future development, we can also choose two 500KVA transformers, or directly choose a transformer with a total capacity of 1000 kVA.

How to calculate the voltage of 10KV/0.4KV, the transformer capacity of 1KVA and the rated input and output current;

We know that the power KVA of the transformer represents the apparent power, so it is not necessary to calculate the power factor when calculating the three-phase AC current. Therefore, Sp=√3×U×I, then I = sp/√ 3/0.4 =1.6928 ≈1.4434a, that is, the rated capacity of the transformer is 1KVA. The rated current of high voltage 10KV input transformer at full load is about: I high = sp/√ 3/10 =117.32 ≈ 0.057737, that is to say, the rated input current of the transformer with 1KVA capacity is 0.05774A