Power Factor Corrector
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The power factor correction is a technique of increasing the power factor of a power supply. Switching power supplies without power factor correction draw current in short, high-magnitude pulses. These pulses can be smoothed out by using active or passive techniques. This reduces the input RMS current and apparent input power, thereby increasing the power factor.The power factor correction shapes the input current in order to maximize the real power from the AC supply.
Low carbon footprint
Managing your carbon footprint should always be a priority, especially when using electrical systems that draw a lot of power. Not only does this have internal benefits but it also improves your public image as sustainability is a priority for consumers. By using power factor correction, you can reduce the overall demand of the system and increase efficiency, reducing the strain you put on the electrical grid.This is because the reactive power is no longer drawn from the mains, it is instead drawn locally. An electrical system draws active power (KVA) and reactive power (KVAr). Lowering the reactive power will increase the active power, thereby creating a more efficient system and helping you to use less energy.
The useful kW load can be increased without overload
By installing power factor correction units and reducing the reactive power, you can reduce the overall current carried by each circuit. This means that the useful kW load of each circuit can be increased further without the risk of overload that you would normally have. In many cases, this allows you to increase the capacity of the system without making expensive upgrades. Often, when introducing new equipment and machinery that puts a higher demand on the electrical system, you must make upgrades to increase the capacity. Installing power factor correction units is a more cost-effective and less disruptive alternative that could save you a significant amount of money.
They prevent Power Factor penalties
Often, there are power factor penalties on your electric bill if your system is below a certain efficiency threshold. It is usually added as an additional charge per kW of power used, and it quickly adds up. Generally, a power factor of 0.92 or lower will incur additional charges on your electricity bill. So, if you have an inefficient system that is already using more power than it needs to and you are then getting additional power factor penalties on top, you are likely wasting a lot of money. Power factor correction will help you avoid penalties by improving the power factor so it is above the threshold. As a result, you will see a significant drop in your energy costs overnight.
Improves voltage stability
A poor power factor leads to an increased current flow, which in turn can cause the voltage drop in the conductor to increase. The voltage going to the machinery is then lower, which can be a significant issue. Low voltage can cause serious damage to electrical components and electric motors are particularly susceptible to problems. An electric motor will draw more current when the voltage is too low, causing it to overheat. Essentially, equipment runs faster and hotter for a shorter period of time, so it is far more likely to malfunction. Not only is this a safety hazard but it also means increased maintenance costs too.
Manufacturing Industries
In industries where motors are used to power machinery, such as in manufacturing, they could benefit from power factor correction. If PFC devices are installed in the manufacturing industry, there will be an increase in available power for future expansion as well as a reduction in the availability required.
Automotive Industries
In industries where welding equipment is used, such as in the development or manufacturing of motor vehicles, power factor correction can help reduce the loss of power, making more use of available power, and so cutting down the cost of electricity. Additionally, installing PFC devices would help to reduce flicker, which are unwanted dips voltage that cause lights to flicker and other power quality issues.
Hospitals
Installing PFC devices in establishments where large LED loads are present, such as in hospitals where they're used by registered diagnostic cardiac sonographers, could help improve power efficiency which then reduces the costs of hospital expansion by allowing more wards and theatres to be run from the same supply.
Shops
Shops will see an increase in the sustainability of their chillers if PFC devices are installed. This is because there will be less wear and tear on components which will also reduce costly outgoings.
Banks And Office Buildings
In places where large computer networks are used, such as in office buildings and banks, PFC can improve the efficiency of the cooling systems which will help the computers to run better and speed up work performance.
Passive Power Factor Correction
This is used for small power supplies of about 100W or less. The correction method uses a low pass harmonic filter at the AC input with the capacitor and inductor forming a series resonance circuit. The components can be fairly small while providing an inexpensive and efficient power factor correction.
Active Power Factor Correction
The active PFC methods are preferred for power supplies of over 100W. This method provides a more efficient correction, is lighter and less bulky.A basic active PFC circuit consists of a control circuit that measures the input voltage and current and then adjusts the switching time and duty cycle to ensure that the input voltage and current are in phase. This provides an automatic correction of the input AC voltage, resulting to a theoretical power factor of over 0.95.
Distributed Power Factor Correction
Capacitor banks are directly linked to the terminal of the load that requires reactive power in this method of power factor correction. This style of installation is incredibly affordable and straightforward. The load and the capacitor bank can both employ the same overcurrent protection mechanism, as indicated in the image below. It can therefore be attached and disconnected at the same time.
Group Power Factor Correction
This approach is typically employed for loads that function similarly. To increase the power factor, a common capacitor bank is offered, as seen in the picture.herefore, you can use a shared capacitor bank for power factor adjustment if, for example, you have three similar induction motors that are employed for the same purpose. Although this approach is similarly cost-effective, it is only advised for light loads.
Centralize Power Factor Correction
Not all loads in a system are connected 24 hours a day. There are some loads that are ON for a very little period of time. Utilizing distributed power factor adjustment in such circumstances is not a wise move. So it is preferred to use centralized power factor correction whose capacitor banks are situated at the system's starting point or centre. This enables a notable reduction in the installed capacitors' overall power. As keeping capacitor banks permanently connected to the system is not a good idea, the capacitor banks must be installed with a switching device.
Combined Power Factor Correction
As implied by the name, it combines two distinct approaches, namely distributed power factor correction and centralized power factor correction. For a big load that operates continuously, distributed power factor correction is applied in this method. Additionally, a centralized power factor correction method is employed to enhance the power factor of tiny equipment.
Power Factor Corrector Components
Main Incomer
It is used as a gateway for the main supply to energise the APFC Panel. It is used for switching “ON” main supply and protection of the APFC Panel. This can be an Air Circuit Breaker (ACB) or a Moulded Case Circuit Breaker (MCCB).
APFC Relay
This is a device that continuously monitors the power factor of the installation and calculates the required number of capacitor banks by comparing it with the desired power factor set in the relay. Then it switches ON the desired number of capacitor banks to compensate for the reactive power requirement. It comes out with various numbers of relay outputs like 8, 12 or 16. It can control as many capacitor banks as it has the number of relay outputs.
Protective Fuses/MCCB
The capacitor feeder is protected by either a fuse or a MCCB. Nowadays it is prevalent to use MCCB instead of Fuse as MCCB offers protection against overload, short circuit and earth leakage whereas Fuse offers protection only against short circuit.
Contactor
It is a switching device used for switching “ON” of capacitor banks. They are being controlled through the APFC relay.
Capacitor Bank
This device generates reactor power for consumption of load or source thereby reducing the total load on the source.
Reactor
It is also called a detuned reactor and is used for the mitigation of harmonics in the system.
Active harmonic filtering and electronic VAR control
When looking at installing PFC, considering active harmonic filtering and electronic VAR control can be beneficial. Not only does harmonic filtering help to improve total Power Factor, it also reduces voltage distortion, current distortion and neutral-to-ground voltage which can cause equipment failure, downtime, frequent maintenance and costly repairs.Harmonics occur when there is voltage and current harmonic distortion within an AC circuit. One of the reasons this occurs is an increased use of non-linear devices as the current drawn by these devices is not proportional to the supplied voltage.
Load type
For applications where there are many large motors in use, one capacitor per motor is usually the most economical solution as they can be switched together. However, for applications where there are many small motors, the motors can be grouped and a single capacitor installed at a central point in the distribution system. Where both large and small motors are used, both capacitor installation methods can be used.
Load size
Depending on the facility size and load requirements, different PFC solutions will be more suitable. For facilities with large loads, using a combination of individual and group loads and banks of fixed and automatically-switched capacitor units would be suitable. Whereas smaller facilities may only need a capacitor at the control board.
Load consistency
Fixed capacitors are the most economic for facilities operating 24/7 and have a constant load demand. However, switched units will be more suitable for facilities operating only part of the time, such as during working hours five days a week, to decrease capacitance when load is reduced.
Load capacity
Power Factor Correction should be applied at the load if feeders or transformers are overloaded, or additional load will be added to an already loaded system. Capacitor banks can be installed at main feeders if the loads are generally stable throughout the site, or automatic switching installed if the loads vary and the site is required to stay within specific power factor criteria.
Payback
The payback and return on investment for any PFC equipment will be determined by the utility tariff for power factor and the specific equipment chosen. If designed correctly, a PFC system has the potential to have a payback within two years.
Maintenance
PFC equipment does require maintenance and servicing, with the time between maintenance dependent on how critical the power factor needs to be controlled, maintenance may be required anywhere from once to several times a year.Getting the PFC equipment regularly maintained is important, since capacitors deteriorate over time as the dielectric inside breaks down gradually when it is switched, as well as stress placed on them from external events. As PFC equipment such as capacitors deteriorate, the Power Factor of the application will become less efficient so will cause an increase in power requirements which results in higher power costs.
Troubleshooting Power Factor Corrector capacitors
Inspection with infrared imager
The most valuable tool for evaluating capacitor banks is a thermal imager. The system should be energized for at least an hour prior to testing. To begin, check the controller display to determine if all the stages are connected. Next, verify that the cooling fans are operating properly. Conduct an infrared examination of the enclosure prior to opening the doors. And, based on your arc-flash assessment, wear the required personal protective equipment.
Current measurements
As part of preventative maintenance, a current measurement on all three phases of each stage should be taken and recorded using a multimeter and a current clamp. Also use the multimeter to measure the current input to the controller from the current transformer in the switchboard, using a current clamp around the CT secondary conductor. A calculation is required to convert the measured current value to the actual current flowing through the switchboard. If the current transformer is rated 3000 A to 5 A, and you measure 2 A, the actual current is . In addition, measure the current through the breaker feeding the capacitor bank for phase imbalance, with all stages connected. Maintain a log of all readings, to provide a benchmark for readings taken at a later date.
Visual Inspection And Cleaning
Also perform a complete visual inspection. Look for discolored components, bulging and/or leaking capacitors, and signs of heating and/or moisture. Clean and/or replace filters for cooling fans. Clean the units using a vacuum - never use compressed air. Prior to re-energizing the capacitors, perform an insulation integrity test from the bus phase-to-phase and phase-to-ground. The control power transformer line side breaker or fuses must be removed to prevent erroneous readings phase-to-phase. Power factor correction capacitors are designed to provide years of service when properly maintained in accordance with the manufacturer's instructions. Inspecting capacitor banks on a regular basis provides assurance that they are operating safely while delivering the anticipated energy cost savings.
Capacitance Measurements
Before measuring capacitance, de-energize the capacitor bank and wait for the period specified in the manufacturer's service bulletin. While wearing the proper personal protective equipment, confirm with a properly rated meter there is no ac present. Follow your facility's lockout/tagout procedure. Using a dc meter rated for the voltage to be tested and set to 1000 V dc, test each stage phase-to-phase and phase-to-ground. There should be no voltage. The presence of voltage indicates the capacitor may not be discharged. If no voltage is detected, measure capacitance with the meter and compare the reading to the manufacturer's specifications for each stage.
Check the capacitors
The capacitors are the main components of power factor correction equipment. They store and release reactive power to balance the load and reduce the apparent power. However, capacitors can degrade over time due to aging, overheating, overvoltage, or short circuits. Therefore, you should check the capacitors periodically for signs of damage, such as bulging, leaking, or cracking. You should also measure the capacitance and the insulation resistance of each capacitor and compare them with the rated values. If you find any faulty or out-of-tolerance capacitors, you should replace them as soon as possible.
Clean the contactors
The contactors are the switches that control the connection and disconnection of the capacitors. They operate frequently and are exposed to high currents and voltages. Therefore, they can wear out or get dirty over time, resulting in poor contact, arcing, or sparking. To prevent these problems, you should clean the contactors regularly with a soft cloth and a contact cleaner. You should also inspect the contactors for signs of corrosion, erosion, or pitting, and replace them if necessary.
Test the relays
The relays are the devices that monitor the power factor and signal the contactors to switch on or off the capacitors. They are sensitive to voltage fluctuations, harmonics, and noise, and can malfunction or lose accuracy over time. Therefore, you should test the relays regularly with a power factor meter or a power analyzer. You should verify that the relays are measuring the power factor correctly and that they are switching the capacitors according to the settings. If you find any errors or discrepancies, you should adjust or replace the relays.
Lubricate the fans
The fans are the devices that cool down the power factor correction equipment and prevent overheating. They run continuously and are subject to dust, dirt, and vibration. Therefore, they can become noisy, inefficient, or faulty over time. To avoid these issues, you should lubricate the fans regularly with a suitable oil or grease. You should also clean the fan blades and the vents with a soft brush or a vacuum cleaner. You should also check the fan speed and the airflow and replace any defective or damaged fans.
Zhejiang Nengrong Electric Power Equipment Co.,Ltd. was established in 2007 (formerly known as Yueqing Zhongrong Power Compensation Equipment Co., Ltd.). It is a high-tech enterprise that provides power system power quality monitoring and control, reactive power compensation, harmonic control, and power safety protection equipment as its core business. Since its establishment, we have always adhered to the concept of "energy conservation creates value, protection builds harmony" and are committed to providing high-quality products and comprehensive solutions for users in various fields to improve power quality, optimize control, save energy and reduce consumption, and protect power grid safety.
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FAQ
Q: What causes low power factor?
Q: How does power factor correction work?
Q: What are the benefits of power factor correction?
Q: How to calculate your power factor?
Power factor = Real power / Apparent power.For example, if your system has a real power of 10 kW and an apparent power of 15 kVA, your power factor is:
Power factor = 10 / 15 = 0.67
This means that your system is using only 67% of the power supplied by the utility, and wasting 33% as reactive power.
Q: How to choose a power factor correction device?
Q: How to maintain a power factor correction device?
Q: What Happens If You Overcorrect Power Factor?
Q: How Much Can Power Factor Correction Save?
Q: How does power factor correction work?
Q: What is the most effective method of power factor correction?
Q: How much can power factor correction save?
The amount of energy savings from power factor correction depends on the power factor before correction, and the amount of power factor correction applied. In general, power factor correction can save between 5% and 25% of the energy consumed by electrical systems.
Q: Does power factor correction reduce voltage?
Q: What are two advantages of power factor correction?
Q: Does power factor correction reduce electricity bill?
Q: How do you size a power factor correction capacitor?
Q: Is power factor correction justified in the home?
Q: Do power factor correction devices work?
Q: Does power factor correction affect active power?
Q: What is the difference between active and passive power factor correction?
Q: What is a good power factor value?
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