Why does the power factor increase to 0 95 after the capacitor is put in, but the total incoming lin

You have to believe in the law of conservation of energy. Capacitors can increase instantaneous power. It's not that the conversion efficiency has improved. Moreover, the capacitors are all connected in parallel in the circuit. It is equivalent to an increase in the load. The current is definitely too big.

You have to determine whether you are looking at the current of active power or depending on the current of power, the current of active power will increase, because the capacitor bank needs to consume active power, and at the same time, if the electronic switch is used for dynamic switching, then the consumption is relatively large.

If you're looking at the current of apparent power, then it's unlikely to see if other equipment is in operation.

The compensation you are talking about is already a good effect.

Although capacitance compensation is automatic, the size of each group of capacitors directly affects the effect of compensation when designing.

Now that the design is confirmed, there is no way to change it.

Unless the capacitor is smaller, the better the automatic switching effect.

It may be that your three-phase single capacitor capacity is relatively large, and if you cut one, it may become 92, and if you add one, it may be overcompensated.

No way, I don't believe it! There must have been a mistake there. Example: p=100kwu=380v

cos = find the current i

i=100*1000/√3*380*

i=100*1000/√3*380*

Conclusion; Factor.

The current dropped from the time it was raised to the point where it fell.

Hello dear and happy to answer your <>

What is the reason for the power factor of all the input capacitors 1. The reactive power gap is large. The power factor of the inductive load in the line is too low, and the active power is large, resulting in too large a gap in the power of the work without liquid cracking, and the total input of the capacitor does not cause the change of the power factor. But the possibility of this reason is very small.

At the beginning of the general design, we will configure the capacitor according to 20% and 40% of the transformer capacity, even if it is at least 20%, then if all the investment is made, it is impossible that the power factor will not change a little. 2. The main circuit of the capacitor is not connected, only the control circuit is connected, and the contactor is just being airdropped. In ordinary times, I have also encountered this kind of problem, some users pull down the branch switch of the capacitor and forget to push it up, the power supply of the controller loop is generally taken from the lower port of the main switch, so it can be switched, but the capacitor is not really connected, so the power factor remains unchanged.

3. Bright and regret the wiring error. The current and voltage signals of the power factor meter or capacitor switching controller are incorrectly connected, which will also lead to inaccurate indications. 4. The instrument is damaged.

In particular, if the mechanical power factor meter is bumped during installation and transportation, the mechanical structure may be misaligned or stuck, resulting in no change in its pointer. 5. Capacitor capacity attenuation. If the capacitor has been used for a long time, due to its own characteristics, the capacitor will naturally decay with normal use, especially in the environment where the working voltage is too high and the working temperature is too high, the attenuation will be faster, and the capacity will be reduced to less than half.

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Oh To understand that shunt capacitors can improve the power factor of inductive loads, we must first understand the power factor.

Power factor is a data used to measure the power efficiency of electrical equipment (including generalized electrical equipment, such as transformers, transmission lines, etc.) of the power grid.

The formula for defining power factor: power factor, active power, apparent power.

Active power is the power consumed by the device and converted into other energy.

Reactive power is the amount of energy that keeps equipment running, but does not consume. It is stored between the grid and the equipment, and is an indispensable part of the energy of the power grid and the equipment. Since the grid has to store a large amount of reactive power, the transmission of active power is reduced, resulting in a decrease in grid efficiency.

Okay, let's talk about the physical essence of capacitive compensation for inductive load reactive power:

When the inductive load is running in the power grid, its reactive power is transmitted as follows: the grid voltage waveform is used to refer to the 1 2 cycles when the voltage starts, the inductive load absorbs the reactive power from the power grid, and the inductive load sends the reactive power back to the grid in the following 1 2 cycles.

The capacitor also needs reactive power to operate in the grid, but its demand time is exactly 180 degrees (or: inverted) from the inductive load: 1 2 cycles after the voltage starts, the capacitor sends the reactive power back to the grid.

After 1 to 2 cycles, the capacitor absorbs reactive power from the grid.

Therefore, we can use capacitors to replace the power grid, when the inductor absorbs reactive power, the capacitor emits reactive power, and conversely, when the inductor emits reactive power, the capacitor absorbs reactive power. The capacitor is used to provide or absorb reactive power on behalf of the power grid, and the capacitor and the inductive equipment are regarded as a new combined equipment, so that the power grid mainly provides active power to this "combined equipment", and less reactive power is provided, which is the essence of the capacitor to improve the power factor of the inductive load.

There is a concept to be clear here: the power factor of the inductive load is a fixed value, the assessment of reactive power is from the port of the power supply end, the parallel capacitor is combined with the inductive equipment to form a new "combined device", and the power factor of the "combined equipment" is improved, that is, the power supply port sees that the power factor of the load is improved.

The principle of reactive power compensation.

The power output of the grid consists of two parts; One is active power; The second is reactive power. Directly consume electrical energy, convert electrical energy into mechanical energy, thermal energy, chemical energy or sound energy, and use these energy to do work, this part of the power is called active power; Does not consume electrical energy; It is just to convert the electrical energy into another form of energy, which is a necessary condition for the electrical equipment to be able to do work, and this energy is periodically converted with electric energy in the power grid, and this part of the power is called reactive power, such as the electrical energy occupied by the electromagnetic component to establish the magnetic field, and the electric energy occupied by the capacitor to establish the electric field. When the current is working in the inductive element, the current is ahead of the voltage 90

And when the current is working in the capacitive element, the current lags with a voltage of 90In the same circuit, the inductor current and the capacitor current are in the opposite direction, with a difference of 180If the capacitive element is installed proportionally in the electromagnetic component circuit, the current of the two cancels each other, and the angle between the current vector and the voltage vector is reduced, so as to improve the ability of electric energy to do work, which is the principle of reactive power compensation.

Don't know in what circuit you "put in" capacitors? How do you get in?

In an AC circuit, a capacitor is actually equivalent to a conductor, and the larger the capacitance, the smaller the capacitive reactance. If the original circuit current is very small, and a large capacitor is connected in parallel with the circuit load, the current of the circuit will increase a lot; If a series connection and the original circuit generate a resonant capacitance, the resulting resonant current will also be large.

Therefore, the methods to reduce the current are: 1. Reduce the capacity of the access capacitor; 2. Change the capacitance of the capacitor so that it leaves the resonant state.

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Summary. With the input of compensation capacitors, the power factor meter pointer on the controller does not move to the normal direction, which should be caused by improper sampling current signal and sampling voltage signal.

If the sampling voltage is 220V, the sampling voltage must be in phase with the sampling current;

When the sampling voltage is 380V, the sampling voltage must be connected to the other two phases of the non-sampling current phase.

What is the matter that the power factor of capacitor compensation cannot be compensated, the more capacitors are invested, the lower the power factor, what is going on? This is the first time this has happened.

With the input of compensation capacitors, the pointer of the power factor meter on the controller does not move in the normal direction, which should be caused by the improper sampling electric current signal and sampling voltage signal. If the sampling voltage is 220V, the sampling voltage must be in phase with the sampling current; When the sampling voltage is 380V, the sampling trillion call voltage must be connected to the other two phases of the non-sampling current phase.

The main reason is that the more capacitors are invested, the more the power factor of the lead shown on the electric energy meter is rolling down, the more capacitors are invested, the faster the reactive power indicator flashes in the electric energy meter, and the more reactive power is used.

Hello, it may be that the electric energy meter is faulty and displayed incorrectly, otherwise the positive and negative poles are reversed.

Three-phase four-wire AC energy meter, up to 6A.

It is this kind of electric energy meter, the more capacitors are invested, the more the reactive power indicator flashes, the faster the indicator flashes, and the more reactive power is used.

It's not this one, that one is on the spot, this is a watch in my house, and it's the same watch as the scene.