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How to understand power factor correction capacitor

How to understand power factor correction capacitor

Power Factor Correction Capacitors control can easily be describe as a reduction in the reactive power (kVAr) of an electrical system. Because the apparent power (kW) and the actual power (kW) are very similar. The angle between the visible power and the actual power is Ball cosⱷ or power factor. Most system developers focus on power factors 0.95 and above.
Previously, it was very easy to adjust the power factor. Most of the discharge loads are resistors and have not been introduce into the kV Ar. So kVA and kW are equal, so no PF control is require or inductively insert, kVAr returns, and the kVA and kW different. Therefore, PF control is require for the kVA and kW inputs. .. KW again.
The remaining kV AR can be easily exceed by entering the same value in the controlVAr (capacitor). In large sites, capacitor “banks” are place inside and outside, depending on the require capacitance. This type of power factor is call the “bias power factor” and is base entirely on the 50Hz signal format.

Why is a power factor correction need?

The reason for adding to an electrical system is very simplee and can be summariz into two important points.

Cost Savings- Many utilities and retailers pay their customers low electricity rates.
KVAR penalty rate
Power consumption is calculate in kW instead of kW
The maximum cost of demand is base on kVA, not k
Fix daily rate base on kVA instead of kW
With the introduction of power factor mapping, these costs can be reduce.
Make better use of network capacity and location- Of course, by reducing the electrical load over the network and location cables. You can connect additional connections or loads without updating the driver. This is a real incentive for the network as it allows new users to connect without increasing line capacity.

Disadvantages of using Capacitors Power Factor Correction

As mention earlier, adding a high kV AR to the grid has been an effective way to correct delays (power factor stops) for many years. However, the addition of the nonlinear load type has increase the number of capacitor failures and fires in the PFC exponentially. This completely rethinks how to use a power factor safely and now controls converters base on power factors such as the Sin excel Static Var and SVG generator.

Harmonic current-harmonic current, which is a high frequency current base on the multiplication of the base current of -50 Hz (for example, 250 Hz for the 5th harmonic and 350 Hz for the 7th harmonic), the capacitor is considere to be a high voltage. device. It has low impedance and uses an elongate capacitor. These additional currents may overload and overheat the capacitor. The higher the harmonic power level, the greater the overload.
Because the Static Var generator is base on an inverter, it is completely harmless to the harmonic current. In fact, Sin excel technology can be use to reduce the power factor and harmonic currents of a single device.

Locking Cartridges

Locking cartridges are equipped with many traditional power-base capacitors. These cartridges are specially design to stop one or two harmonic currents (usually 5th and 7th). However, the harmonic current generate by the nonlinear load is generate at an infinite. Frequency, allong the capacitor to select other harmonics when the 5th and 7th are block. Another area that is often overlook in power factor system development is. That the output voltage of the reverse reactor is up to 10% higher than the input. Therefore, for reliable work, you need to select a capacitor with the corresponding voltage.
Static Var generators are not expose to harmonic currents and do not require inductance blocking. Resonance is the ultimate thing for any system. The system can be tune if the induction and capacitance are equal at a certain frequency. Static Var generators are based on inverters and are equipped with factory-developed ventilation systems. If used in an environment where the temperature is too high, they will trip.

Excessive voltage

capacitors are very sensitive to rising damage. Overvoltage is often seen as a simple power transfer, but turning on and off the capacitor as a result of changing the power factor requirements with the contactors will result in significant voltage changes at the capacitor terminal, especially when the capacitor is half charged.
Static Var generators are infinitely variable, so the “steps” are not turned on or off, which eliminates the risk of transient voltage.

We hope you find out more about this topic, so check out our next article, which explains the mechanism of these issues in detail.


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