Capacitor cabinets reduce power loss

Function of capacitor bank

The main function of the capacitor bank is to improve the power factor (cos phi coefficient) in order to reduce the unworked power (also known as reactive power). <3

 

Introduction of capacitor bank

Cos phi capacitors aka reactive power compensation cabinets usually install capacitors in parallel with the load, controlled by a controller Capacitor control automatically 4 or 14 levels, through the switch device (Contactor).

Compensating capacitor usually uses 02 common types of capacitors: compensation capacitor oil and dry compensating capacitors, with many division capacities to suit the needs of use from 5Kvar – 50Kvar.

Common compensation methods are: individual compensation, group compensation, focus compensation, dynamic compensation, background compensation, …

See: How to calculate the required capacitor capacity according to the electricity bill

Tại sao phải lắp đặt tủ tụ bù?

Location of cos phi compensator

Extraordinary cos compensation cabinets are used in the electrical system environment of factories, factories, commercial centers, hospitals, apartments, transformer stations, pre-installed with highly inductive loads, often using contactor to adjust the number of active compensating capacitors, operating to match the current cos phi. Can be operated manually or automatically (via the condenser controller).

Operating principle of capacitor bank

When operating the compensating cabinet in automatic mode, the compensating cabinet controller will automatically calculate the amount of power needed to give reasonable contactor switching instructions to ensure the unstable cos coefficient according to the regulations. electricity industry. Each level of the controller will be assigned with a contactor to perform switching tasks.

If the phase difference of the current and voltage is less than the set value (normal setting factor is 0.95), the controller will automatically switch off the compensating capacitor until it reaches the nearest value compared to the coefficient. setting, and keep it at that value. The condenser controller is programmed to optimize the switching process to suit the specific needs of the system. In order to ensure smooth and efficient operation, stability and longevity, electrical engineers often use harmonic filter reactors to make capacitors work at their best. The harmonic filter reactors have types such as 6%, 7%, 14% depending on the power network.

Illustration: Harmonic filter reactor[ /caption]

After surveying through many units, consulting phones, assisting in answering questions, Quan Pham found that most of the units have not used capacitor banks and if they do, it is only to increase the cos phi factor. so as not to be fined but not really take full advantage of the benefits of the capacitor bank yields.

See: How to calculate the required capacitor capacity according to the electricity bill

Compensator capacitors: Structure, classification and how to calculate capacitor capacity