What is Capacitor banks?
Capacitor banks, a group of several capacitors of the same rating that are connected in series or parallel with each others, help to improve the quality of the electrical power and gives us the more efficient operation of the power system. Capacitor banks are inexpensive if we compare the benefits they deliver to overall power system and can be easily installed anywhere on the network. Automatic Power-factor Correction (APFC) Capacitor Banks also known as Shunt Capacitor Banks (SCB) are installed to provide reactive compensation and power factor correction. The use of APFC improve voltage regulation, saves power loss and improve transmission capabilities.
What Does a Capacitor Bank Work?
Capacitor banks, work on the same theory that a
single capacitor does; they are designed to store electrical energy, just at a
greater capacity than a single device. An individual capacitor consists of two
conductors which are separated by a dielectric or insulating material. When
current is sent through the conductors, an electric field that is static in
nature then develops in the dielectric which acts as stored energy. The
dielectric is designed to permit a predetermined amount of leakage which will
gradually dissipate the energy stored in the device which is one of the larger
differences between capacitors and batteries.
Typical Applications
Our modern world of electronics requires a lot
of energy. To meet this demand, energy must be stored electrically for easy
access. Capacitors are ideal for storing large electrical energy charges as
well as conditioning the flow of energy as needed.
Here are some of the typical uses for capacitor banks:
• Shunt Capacitor: A shunt is a
mechanism that allows electric current to pass around another point in the
circuit by creating a low-resistance path. In electrical noise bypass
applications, capacitors are used to redirect high-frequency noise to ground
before it can propagate throughout the system, but especially to the load.
Shunt capacitor banks are used to improve the quality of the electrical supply
and thus improve the efficiency of the power systems.
• Power-Factor Correction: In transformers and
electric motors, capacitor banks are used to correct power-factor lag or phase
shift in AC Power Supplies.The power factor of
an AC power system is a comparison of the power used by the load, called the
“real power,” divided by the power supplied to the load, known as “apparent
power.” In other words, the power factor is the ratio of the useful work
performed by a circuit compared to the maximum useful work that could have been
performed at the supplied voltage and amperage.
In electric power distribution, capacitor banks are used for power-factor
correction. These banks are needed to counteract inductive loading from devices
like electric motors and transmission lines, thus making the load appear to be
mostly resistive. In essence, power-factor correction capacitors increase the
current-carrying capacity of the system. By adding capacitive banks, you can add
additional load to a system without altering the apparent power. Banks can also
be used in a direct-current (DC) power supply to increase the ripple-current
capacity of the power supply or to increase the overall amount of stored energy.
• Store Energy: Like individual capacitors,
capacitive banks store electric energy when it is connected to a charging
circuit and release that energy when discharged. Capacitors are commonly used
in electronic devices to maintain power supply while batteries are being
changed. For modern consumer devices like mobile phones, high-storage capacity
is needed in a very small volume due to limited space.
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400V Capacitor Banks
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