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Anonymous users2024-01-24If it's a rough calculation.
Just add the three-phase power and you're good to go.
Accurately calculated.
Use a clamp ammeter to measure the largest current from the outgoing end of the line, and set the formula p= 3 380 I(current) cos
COS is generally taken, and the maximum current is generally taken for household metering, so if you connect the equipment in the future, it will be very disadvantageous
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Anonymous users2024-01-23How to calculate the capacity of a three-phase transformer.
First, it is necessary to know the maximum power of each phase of the load.
Add the load power of phase A, phase B and phase C independently of each phase, for example, the total power of phase A load is 10KW, the total power of phase B load is 9KW, and the total power of phase C load is 11KW, and the maximum value is 11KW. (Note: The power of each device in the single phase is calculated according to the maximum value on the nameplate, and the power of the three-phase equipment divided by 3 is equal to the power of each phase of the equipment.)
For example, the total power of phase C load = (300W X 10 sets of computers) + (2KW X 4 sets of air conditioners) = 11KW
2. Calculate the total power of the three phases.
11KW X 3 PHASES = 33KW (TOTAL POWER OF TRANSFORMER THREE PHASES).
Three, three-phase total power, this is the most important step, the current market sales of transformers more than 90% of the power factor only, so need to be divided by the power factor.
33KW = total transformer power).
Fourth, the total power of the transformer, according to the "power engineering design manual", the transformer capacity should be selected according to the calculated load, for a single transformer with stable load power supply, the load rate is generally about 85.
= The power of the transformer that needs to be purchased), then you can choose a transformer of 50KVA when purchasing.
This is talking about single-phase, and if there is a three-phase, just add the three-phase power directly
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Anonymous users2024-01-22Direct addition, the power factor must be considered, and the calculated power should leave some margin if the transformer is selected. Then the three phases should be balanced as much as possible. Copying something, not looking.
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Anonymous users2024-01-21Yes, the power is the sum of the power of each electrical appliance.
220V is used for household use, because the electricity consumption of residents is 220V, and 380V is the power electricity, and the family will not have this kind of equipment.
It can be changed, but now it is impossible to say that you can't see the original circuit diagram.
If the complete three-phase balance, 300A*380V*, greater than 130KW, yes, but if the three-phase is unbalanced, the total power required should be calculated by the maximum one-phase current, and it is easy to overload the difference by such a point.
In China, the normal residential power supply (that is, civil electricity) is 220V, which may be lower than 220V, so there will be a margin of error for the voltage in the design and manufacture of household appliances, as long as this is met, it is normal. The normal voltage in Japan is 110V.
The toilet should be alternating current, and it must be alternating current for convenience, so if you still use direct current, can it be convenient?