In condition of energetic resources deficiency, growth of electric energy cost, considerable increase and production development and cities infrastructure, the transportation problem of energetic saving technologies and electric energy consumption is still actual. Economy of electric power, firs of all, depends on its effective employment of separate industrial banks. Such standard system and installation of different production processes are the systems of lighting, electric motors of technological equipment, electro-thermal banks, welding equipment, converters, transformers and others.

Most of electric banks consume reactive power as well as active power to provide normal work hours. As distinct from active power which transforms in useful mechanical, heat and another of powers, reactive power irrelevant with fulfillment of a useful work, but it goes on making electromagnetic fields.Reactive power is a factor reducing quality of electric energy, causing the negative phenomenon as rising payment to supplier of electric energy, additional losses in conductors on account of increasing of a current, uprating transformers power and a cable section, transient tension deviation of a network from a rating. Transmission and consumption of reactive power are accompanied losses of active power, kW.

Where:I - load current, A;R – resistance, Om;

That is depends on a square of a load current, therefore, it is important for reduction losses to lower value of a full current.For an electrical network it is important to keep balance of total power (quantity of made energy should correspond to quantity of consumed energy).Thus it is necessary to provide balance of a reactive power both for a system as a whole and for separate clusters of a network.Value describing a consumed reactive power, is the power coefficientThe power coefficient is a ratio of active power (P, kw) and total power (S, кVAr), consumed by the electro receiver from an electrical circuit:

The technological value of a power coefficient cоs j is concluded in that the capital and operational activities depend on productivity of the electrical installations and, therefore, on its value.

Low cоs j brings to:

•  Losses of power in networks;

•  Increasing of losses;

•  Voltage deviation;

•  Additional expenditure for building more powerful electric station.

Often consumer needs compensation of reactive power in different conditions but for all that he have no exact principals to calculate main parameters of capacitor banks, and as a result he finds difficulty in choosing of concrete type. Therefore we arranged recommendation to choose one or another type. For calculation of capacitor banks parameters it is necessary to know total power of load and operational power coefficient of a network cоs j. The calculation is made by method presented below.Main parameter of capacitor bank is reactive power, consumed by bank from network - Qуст, measured in kilovolt- ampere reactive (kVAr). Reactive power calculated by formula:

Where:Pa – active power of loadK - correction factor (selected by table)ExampleActive power of load: P=100 kVtActive cоs (j ) 0.61Required cоs (j ) 0.96Coefficient K from table 1.01Required active power of bank = 100*1.01=101 kVAr