Reactive power compensation devices
Production of systems and installations for reactive power compensation according to the customer’s specifications to improve energy efficiency and reduce energy costs for manufacturing, agricultural and industrial enterprises, in office centers and supermarkets. We produce the following devices and systems for reactive power compensation: capacitor units (CU), complete capacitor units (CCU), automatic capacitor units (ACU).
Our principles for solving the assigned tasks
- Flexibility and speed in decisions
- Energy efficiency
- Environmental Safety
Reactive power compensation devices Kiev, Ukraine
Modern and reliable power supply and automation solutions
Reactive power compensation. Condensing units.
Reactive power compensation devices (RPCD), they are also capacitor units (CU), complete capacitor units (CCU), automatic capacitor units (ACU).
What is RPCD and what they are for, we will try to figure it out now. But to begin with, it will not be superfluous to remember what reactive power is and why it needs to be compensated.
Any electrical machine or static device always consumes two types of electrical energy from the network – active and reactive. Active energy (kWh) is completely converted into mechanical power (work) and heat (losses). Reactive consumed energy (kvar * h) is used to power the magnetic circuits of electrical machines and devices. The total energy (kVA * h) is the vector sum of the two previous types of energy. It is generally accepted that reactive energy is not consumed in the classical sense of the word, but simply fluctuates from an energy source to a receiver. <\ P>
What does all this mean?
This means that for the operation of an electric motor or transformer (to a greater extent) and all other electrical receivers (to a lesser extent), reactive energy is needed. This is the energy that is generated once by the source, is converted into the energy of the magnetic field of coils, cables and other circuits with current in one half-cycle, and in the other half-cycle is converted back into the energy of the electric field of the source, and so on during the entire operation of this device. Thus, between the source of energy and its receiver, a part of the energy (often not small) constantly fluctuates, which does not perform useful work (although it is necessary for its accomplishment). If energy means power, and if power means current. That is, the reactive current flows back and forth. It would be nothing, but this current also needs a “place” in the total cross-section of the wire going to the consumer, and although the current is reactive, losses in the conductor due to heating cause the most active ones. Hence, we see a negative “color” over the term “reactive energy”.
Coming to the topic of compensation.
So, in order not to “drive” this energy (and hence the current) all the way from the energy source (and this is ultimately a power plant) to the consumer (an asynchronous motor sharpened in your garage) and not load it with a jet all prefabricated main sections (and there are a lot of consumers) decided to “give out” this reactive energy, which is still needed, as close as possible to the electrical receiver that needs it.
How is this implemented?
In parallel to the consumer of reactive energy, a capacitor bank is connected, which is also a reactive element, but one that can convert the energy stored in the magnetic field of the device in the first half-cycle into the energy of the electric field of the capacitor in the second half-cycle, and so on in a circle. Thus, reactive energy fluctuates only part of the “path” from the source to the receiver of energy. The full “path” naturally passes that part of the energy that is constantly consumed (active energy). The ratio of active energy consumed by a device or machine to the total amount of energy transmitted to it is called the cosine phi or power factor , it shows how efficiently we use the section of the line leading from the source to the consumer … With theory, everything seems to be.
So, the RPCD is a low-voltage – 400 V (although there are high-voltage) complete device (NCU), which is designed to increase the cosine phi. This is done by connecting capacitor banks in parallel to the load, but not immediately, but gradually – in steps, until the cosine phi reaches the desired value.
Appointment of RPCD
The massive distribution of the RPCD has become a response to the problem of lack of high-quality power supply due to the increase in the number of energy consumers and the increase in the load on the power grid. An automatic reactive power compensation device increases and maintains the set value of the power factor in three-phase networks with a voltage of 6-10 kV. A correctly selected and installed reactive power compensation unit reduces electricity consumption by 30-50% and provides a number of positive effects:
- reducing the load on the power grid;
- extending the life of electrical equipment;
- reduction of thermal current losses;
- phase alignment and noise smoothing;
- softening the influence of higher harmonics.
Who sets the desired value?
Of course the user! This is done by entering the value on the digital display of the reactive power controller. How does the RPCD “know” that the cosine is such and not another. For this, the product includes a current transformer, which allows you to measure (control) the current “flowing” into the electrical installation. It goes without saying that all stages of the RPCD and the RPCD itself must be protected from short-circuit currents. – this is done by circuit breakers or fuses. Switching (connecting / disconnecting) of the steps is carried out using special contactors for the RPCD at the command of the controller. And finally, all this needs to be placed in a shell (cabinet, shield) of the required dimensions, the desired design and equipped with cooling (since the RPCDs can get quite hot).
In the formation of the price for this GCC, first of all, the total power of the CCRM matters (determined according to the project or by means of appropriate measurements at the facility), the number of control steps, the accuracy of regulation, the brand of equipment and, importantly, the nature of the loads of the electrical installation. The latter implies the division of the RCRM according to the type of network, where the unit will be used, for a weakly, medium- and heavily contaminated network. Contaminated with what? Currents that are multiples of the third harmonic of the mains sinusoid. In a simple way – the more computers, fluorescent lamps, rectifiers, switching power supplies, arc heaters, frequency converters in the building, the more polluted the network is. Hence the use of higher class capacitor banks.
Finally, I would like to note that we will be happy to provide you with the necessary advice when choosing a control unit and give a commercial offer for a high quality product with the specified characteristics.
Scope of RPCD
An automatic reactive power compensation system optimizes the operation of energy-intensive equipment – asynchronous motors, compressors, pumping stations, welding transformers and arc furnaces. By reducing the power consumption, the RPCD unit helps to reduce operating costs and increase the profitability of the enterprise. Condensing units are widely used in mechanical engineering, oil refining, metallurgy, food and chemical industries, ports, sawmills and woodworking enterprises.
Modes and types of RPCD
The mode of operation of the RCM system depends on the installation site; four ways of reactive power compensation are available – centralized (on the high or low voltage side), group and individual. Each method has its own advantages and disadvantages; the compensation mode is selected depending on the layout of the premises and the requirements of the production process.
- Centralized compensation on the high voltage side – RPCD is connected to the 6-10 kV buses, relieving only the upper links of the network.
- Centralized compensation on the low voltage side provides for connecting the RPCD to 0.4 kV buses; at the same time, the upper links and transformers are unloaded.
- Group compensation is the most common option; RPCD is connected directly to buses and distribution points; in this case, the load of the switchgear must exceed the capacity of the capacitor unit by more than two times.
- Individual compensation is considered to be the most effective, since with direct connection of the RPCD to an electrical receiver, self-regulation of reactive power is provided.
To reduce current losses, they try to locate capacitor banks in networks where compensated power is consumed. The type of device is selected based on the characteristics of the equipment and the complexity of control; there are three options for the RPCD to choose from:
- unregulated – battery operated, used in systems with low reactive power – up to 15% of the nominal;
- automatic – supplies power by adding control steps;
- dynamic – designed to compensate for rapidly changing loads.
RPCD complete set
A standard capacitor unit UKRP consists of a capacitor, a reactive power controller, a circuit breaker, contactors and a protective group; at the request of the customer, a fan with a temperature sensor is additionally installed. Structural elements are placed on a metal panel or inside a steel case with an IP32 electrical protection level; cabinet wall thickness – at least 1.5 mm.
Certificates and Licenses
Our own high-tech production, cooperation with manufacturers of reliable and modern components, as well as extensive experience in projects of various levels of complexity allows us to implement the ideas of our clients at reasonable prices.
We use only reliable components
We use only reliable components from well-known world manufacturers
Prices for electrical services
Prices for electrical services depend on the scope of the project, conditions and features of the installation of structures at the facility.
The price for electrical services is much lower if you order design, production and installation from our company.
The exact cost of electrical services is announced when calculating the estimate of the task.