Low voltage capacitors play an important role in the power system. Each type of capacitor has its own advantages and disadvantages. So what is low voltage capacitor? Uses and types of low voltage capacitors on the market. All will be answered shortly.
What is low voltage compensation?
Low-voltage capacitor is a system consisting of two conductors placed close to each other and separated by an insulating layer, which discharges and charges in the circuit.
Capacitance is a quantity that characterizes the ability of a compensating capacitor to charge at a certain voltage. It is determined by the quotient between the charge itself and the potential difference between the plates of the capacitor.
The purpose of using low-voltage capacitors in the power system is to compensate for reactive power to improve the power factor cos phi to bring efficiency in the operation of the power grid as well as to avoid fines according to regulations. regulations of the Electricity Industry. Low-voltage capacitors are also a key component in the reactive power compensation switchboard alongside other devices to ensure that the system can operate intelligently, safely and stably…
Uses of low voltage compensating capacitors
+ Compensation for reactive power for low-voltage grid: If your power system has a cos phi factor of less than 0.85 without or installed a low-voltage compensating capacitor but still cannot apply demand, you will be fined. Therefore, the installation of a low voltage capacitor system can solve the above problem.
+ Reduce electricity bill: according to the regulations of electricity, when your consumption system has cos phi <=0.85, the amount of Q consumed will be charged. Therefore, in order not to be penalized, we should install a cos phi capacity compensating capacitor system. There are many ways of compensation such as hard compensation or soft compensation, automatic or manual compensation. But most of us choose the solution of soft compensation and automatic compensation.
+ Reducing losses on transmission lines: there are two components that cause electrical power loss, which is the component due to active power that cannot be reduced and the component due to reactive power, which we can completely handle.
+ Reactive power compensation reduces voltage drop: The cause of voltage loss is due to active power and reactive power. So, when installing a compensating capacitor, it will compensate for the distance we pull so that the equipment and motor when starting at full capacity will not burn or get hot.
+ Reactive power compensation increases the transmission capacity of the wire: the current flowing on the line consists of 2 active and reactive components. If we compensate at the end of the line, the reactive current will be reduced. Therefore, we can give the transmission line more active current, the way is very simple.
Structure of low voltage compensating capacitor
Usually a special type of oil-impregnated capacitor, consisting of two plates that are long aluminum foils insulated by layers of paper. The whole thing will be fixed in a sealed vessel and the two ends of the plate will be brought out.
Classification of low voltage compensating capacitors
+ Classification by structure: including low-voltage oil capacitors and dry low-voltage capacitors. Capacitor for low voltage oil is rectangular in shape. The advantage is high durability and use for all compensation systems, especially those with large power compensation, harmonics and bad power quality. The dry low voltage capacitor has the shape of a round tank, the advantage is compact, light weight, easy to install and replace, save space for electrical cabinets with affordable price.
+ Classification by voltage: including 1-phase low-voltage capacitors and 3-phase low-voltage capacitors. Single-phase low-voltage capacitors include 2 types of voltage, 230V and 250V. The 3-phase low-voltage capacitors include voltages of 230, 380, 400, 415, 440, 525, 660, 720, 1100V…
How should I choose a capacitor?
There is a problem that many people wonder how to choose the type of capacitor to both save costs and bring the best efficiency. In the design problem of reactive power compensation system, this is an important question. And to choose the right type of cabinet, users need to understand the specifics of the electrical system for each unit so that they can decide on the choice.
Note when using low voltage compensating capacitors
In order to use low-voltage capacitors with high efficiency, we need to install control systems or equipment exactly as the diagram of the grid system has been designed, to avoid possible fire and explosion. When having technical problems related to low voltage capacitors, do not repair it yourself, but need to contact a technician or an experienced person to handle it.
Hopefully the above information will help readers better understand what low voltage capacitors are and information related to low voltage capacitors. Do not forget to visit Mitu’s website daily to update the latest news.
