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Power Capacitor

Power Capacitor

Power capacitors are used to store electric charges & regulate the flow of electricity in an electrical system. Electricity can be unpredictable and can cause fluctuations that can harm other electrical systems in the area.
Industries that use induction motors often have a low power factor in the surrounding distribution line, hence the use of power capacitors. This causes a loss of KVAR and wastes energy. Improving the power factor is considered an important measure for energy conservation.
The device consists of one or more pairs of plates separated by an insulating material (the dielectric) and attached to two terminals that allow the stored energy to be discharged into a circuit when required.
Incorporating capacitors into a power distribution system offers economic and operational benefits, including increasing system load capacity, reducing losses, and improving power factor.


Uses of Power Capacitor

Here are some of the most common uses of power capacitors:

  • Power Factor Correction – PFC reduces the amount of current needed from the main supply for a given output level, improving electrical equipment efficiency.
  • DC Link Capacitors.
  • Frequency Converters.
  • Motor Start and DC Link Capacitors.
  • In harmonics filter circuits.
  • They are also used in various applications like air conditioners, refrigerators, elevators, fans, motors, etc.
  • Power capacitors also contribute to quality power consumption by reducing losses from reactive power consumption.
  • Power capacitors are also used in energy storage applications such as those found in electric vehicles (EVs) and hybrid electric vehicles (HEVs).

Power Capacitor Types

Power capacitors are available in different types based on their requirements:

Parallel Capacitors: Parallel capacitors are generally used to compensate for the inductive load’s reactive power within the power system so that the power factor can be increased, line loss can be decreased, and voltage quality can be enhanced.

Series Capacitors: Series capacitors are used in high-voltage systems to compensate for the power systems’ reactance. These capacitors can be connected in series with high voltage transmission & distribution lines to compensate for the transmission line’s inductive reactance and maintain the stable & dynamic system stability.

Coupling Capacitors: These capacitors are used in high-power transmission lines for control, measurement, high-frequency communication, and protection. These capacitors play a key role in devices to remove electric energy.

Electric Capacitors: These capacitors play a significant role in electric heating systems with a 40 to 24000 Hz frequency range to enhance the power factor and the frequency or voltage of the circuit.

Pulse Capacitors: These are used where stable low dissipation factors are necessary to handle ripple currents within power conversion-based applications.

DC Filter Capacitors: These capacitors are applicable in high-voltage-based rectifier filters and DC devices.

Standard Capacitor: Standard capacitors are used in high-voltage-based circuits to measure high voltage & dielectric loss.

Advantages and Disadvantages of Power Capacitor:-

Let’s understand the advantages and disadvantages of power capacitors:

The key advantages of a power capacitor include the following.

  • Improved Power Factor: Power capacitors are mainly utilized to enhance the power factor of electrical systems. A low power factor signifies ineffective energy usage, which can lead to greater energy consumption and higher utility bills. However, incorporating power capacitors can rectify the power factor, leading to more efficient energy utilization.
  • Energy Savings: When power capacitors are used to correct the power factor, they reduce the amount of reactive power (kVAR) required from the utility to meet the same real power (kW) demand. This reduction in reactive power means less energy is wasted, resulting in energy savings and cost reduction.
  • Improved Power Factor: Power capacitors are mainly utilized to enhance the power factor of electrical systems. A low power factor signifies ineffective energy usage, which can lead to greater energy consumption and higher utility bills. However, incorporating power capacitors can rectify the power factor, leading to more efficient energy utilization.
  • Reduced Voltage Drop: In electrical distribution systems, voltage drop can occur due to impedance, especially in the presence of inductive loads. Power capacitors supply reactive power, counteracting voltage drop and helping maintain stable voltage levels throughout the system. This can prevent voltage-related issues and equipment malfunctions.
  • Equipment Efficiency: Power capacitors can extend the lifespan of electrical equipment, such as motors and transformers, by reducing the stress and heat generated in the system. This improved equipment efficiency can lead to longer lifespans, reduced maintenance costs, and increased reliability.
  • Compliance with Utility Regulations: Many utilities impose penalties or charges on commercial and industrial customers with poor power factors. Installing power capacitors ensures compliance with utility regulations and standards, helping businesses avoid these penalties and associated costs.

The disadvantages of a power capacitor include the following.

  • Power capacitor drawbacks include a cost that is significantly higher than other types of capacitors.
  • Power capacitors are only able to work in applications that have been rated for their frequency and voltage.
  • They have the disadvantage of being susceptible to dielectric absorption, which can be an issue in some applications, though this particular problem can be corrected with proper design
  • Prone to aging with exposure to high voltages and high frequencies, which can lead to failure over time.
  • Moisture can cause damage due to its sensitivity, so avoid exposing it to water or high humidity.
  • They need insulation from the heat produced during the working process. The insulation layer can get damaged, which leads to overheating and breakdown at a faster pace.

The best solution for power capacitors offered by BCH Electric Limited
A variety of industrial establishments across the country rely on BCH Electric Limited for our power capacitor needs. We offer various types of power capacitors, including those with adjustable current limits.
Our diverse range of power capacitors suits various industries and applications, including manufacturing, commercial buildings, renewable energy, and more. We can be customized to meet specific requirements, making them adaptable to different environments.
These capacitors play a crucial role in enhancing the efficiency and reliability of electrical systems, making them an indispensable component for various industries and applications.
Our capacitors contribute to better power quality by reducing harmonics, voltage fluctuations, and electrical noise, which leads to smoother operations and longer equipment lifespan.
BCH also has a team of experienced engineers and technical experts who provide excellent customer support. They offer guidance in selecting the right capacitors and assist with installation and maintenance, ensuring a seamless experience for their customers.

Specification & Features LT capacitor

  • Range 1KVAR to 50KVAR
  • Type :
    • ‘MPP’ Cylindrical type  – Normal & Heavy Duty
    • ‘MPP’ Box type  – Normal & Heavy Duty
    • ‘APP’ Box type – Single layer
    • ‘SHDLL’ Box type- Super Heavy Duty Long Life
  • Rated Voltage ( Vn): 440V /480V/525V
  • Frequency : 50(+/-3%) Hz
  • Insulation Voltage : 3 kV AC
  • Rated Temperature : 50°C
  • Life expectancy : 80000-1,25,000 Hrs


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