A stable 220V circuit from three phase electricity should be simple and cheap 30

The computer and the monitor are electronic products, there is a good voltage regulation circuit inside, and the adaptability to the power supply voltage is strong, as long as the power supply voltage fluctuation at your place does not exceed its voltage adaptation range, it can work normally. You can judge for yourself that if it is indeed beyond the voltage tolerance range of computers and monitors, or due to the needs of other electrical appliances, you can invest in some power supply equipment appropriately. Low voltage can be solved by stepping method, and voltage instability can be solved by voltage stabilization method.

China's power system is a three-phase four-wire system, and the "three-phase four-wire system" refers to a middle line of three phase lines, and the middle line is 0 potential, and 0 potential is generally obtained by grounding. The voltage between each phase wire is 380V, and the voltage between the phase line and the center line is 220V. Electricity is taken through the phase line and the middle line, which is the so-called single-phase electricity, and I estimate that your electrical appliances are all single-phase electricity.

You'd better check whether the voltage of each phase of the power supply line (the voltage between the phase line and the center line) is balanced, if not, there must be a phase highest, a phase is the lowest, if the highest phase voltage is stable and highest for a long time, and within the voltage adaptation range of the computer and monitor, you can choose the phase electricity. If it is not within the voltage adaptation range of the computer and monitor, and all the time it is only low or low, and the fluctuation is not large, then you can use the boost method to solve the problem. You can buy an auto-transformer with the right power.

If the voltage fluctuates greatly, then you can use the voltage regulation method to solve the problem. You can buy an automatic voltage regulator transformer with suitable power.

The input is three-phase, and the output is 220V single-phase transformer, in fact, you only need to draw power from the phase line and the middle line at the output end of the transformer, but it is a bit wasteful. The input is a two-phase line (the voltage will be greater than 220V), and the output is a 220V transformer, which is actually a step-down, in this case, the output must have one end grounded as the center line to be safe.

The easiest way to do this is to buy an automatic three-phase regulator. Mechanical ones will do. And the power is not large (a single computer is calculated as 150W), cheap.

Divide the 100 units into three channels, each with one phase and share the neutral line! This can not only increase the driving capacity, but also make the three-phase balance! This will also reduce voltage fluctuations!

If you don't feel that the voltage is stable enough, buy three regulators.

This situation is very common in rural areas, and the only way to get a stable household voltage is to install a transformer, there are small regulated transformers, the input is 380v or lower, and the output is 380v, which should be solved after the computer is grouped.

It's not easy to do, 15KW is calculated according to 150W, and it should be divided into a group of 33 units, with three-phase power supply.

The voltage adaptability of the computer switching power supply is very good, and it should work above 160V.

100 PCs, CRT monitors. I guess you still have to install a big air conditioner in that computer room.

The voltage is low and unstable, which proves that your unit is far away from the transformer, the line loss is too large, and there is high-power machinery working on the same line as you... In the case of less load, you actually measure whether the single-phase voltage is lower than 160V, if it is too low, you have to increase the wire diameter. If it is too far, the cost of increasing the wire diameter (labor + materials) will be very high, it is better to go to the power department to apply for the erection of a high-voltage line, and then install a high-voltage transformer.

A 380v plus a 0 line is 220v. Upstairs is right. The computer switching power supply has good adaptability.

The line voltage of the three-phase circuit with 220V phase voltage is (withering) hunger resistance.

Correct answer: 190v

In the three-phase line connected to the single-phase electrical equipment, what is the situation that a certain phase will be connected with zero phase.

There are two situations when the ground wire, the neutral wire and the live wire are connected: one is that the resistance is 0; The other is a resistor with a Qing Boding. Normally:

The resistance between the ground wire and the neutral wire is smaller than that of the argument, and may be close to 0; The resistance between the neutral and live wires depends on the number of loads that have been turned on, but should not be 0 ohms. If the resistance between the neutral line and the live wire is close to 0 ohms, it is most likely that there is a short circuit fault, and the power can only be transmitted after the elimination of the center. It is not abnormal that the ground wire is connected with the incoming live wire, but it is not allowed to be connected, and if it is connected, it cannot be used at all.

The neutral wire and the ground wire are connected, this is because the lead wire and the ground wire at the distribution box are connected, and the power switch has been turned on, the reason is that the neutral wire is connected through the neutral point of the transformer and your ground wire, if you disassemble the main line of the neutral line and the ground wire at the distribution box in the measurement, he should not be connected, and the responsible person should check whether your indoor wiring is.

The inductive reactance XL in the question should be changed to 6, not 6W.

Because the unit of apparent power is volt-ampere (VA), not watts (W), options C and D are excluded. The answer to the calculation is 600. Pick B.

In this question, d is selected as the load impedance size z2 = 62 82, so z = 10 phase current = 380 10 = 38a Since the load is three coincidental delay angle shape lifting Li method, the line current = 3 phase current, so the current represents the number = wide Qi 3 38 = a

Let's talk about the idea: 1. Use p=3uicos, i=p (3*380*cos) ir=i*cos (active current) to guess the pose, and ii=i*sin (reactive current) to find the active and reactive currents of the two loads respectively.

2. The active current is added, and the reactive current is added to obtain the total active current and the total reactive current, and the total current and total power factor are calculated.

3. The power supply voltage is u=380v + 3*i*z, just find the effective value.