Network Energy Saving Unit SAV

Network Energy Saving Unit SAV simultaneously implements 5 functions in a single unit:

  • • Power Factor Correction
  • • Harmonic filtering balancing phases
  • • Limiting the maximum inrush current
  • • Due to the complex decision problems range mains GUARANTEED energy savings of 15% to 25%
  • • Depending on the degree of each of the power supply network problems achieves energy savings of from 10% to 40%
  • • Integrated solution with one unit of the main problems of any electricity grid
  • • Can be used with a wide range of devices that show quality issues of power supply, including diesel generators, solar converters, etc.

Preliminary information on the offer of the company Infinity SAV on the technical means providing improvement of quality and reduction of consumed energy is presented below

Power Quality Problems

The quality of electricity in the network in most countries of the world is not ideal. Depending on the type of load in the systems and the quality that the electricity supplier provides, users are faced with one of the following problems (or combinations):

Harmonic distortion

Even with the guaranteed quality of the supplied energy and the absence of distortion, distortions can occur in the process of energy consumption and are caused by the nature of the load-impulse power sources (for example, in personal computers), alternating current motors and fluorescent lighting. In recent years these devices have appeared in large numbers both in enterprises, as well as in apartment houses and cottages. Harmonic distortion can cause overheating in the windings of motors, as well as a decrease in the efficiency of systems. In addition, the presence of harmonics reduces the power factor, which is due to the increase in the proportion of reactive energy, which cannot be used by the load.

Uneven phase loading

In three-phase systems it is difficult to achieve a uniform loading of all phases, so often one (or two) phase is loaded more than others. For example, this situation occurs when single-phase sockets and lighting devices are connected to one phase of a three-phase system, causing an increased load of this phase relative to the others. The consequence is a decrease in the overall system efficiency.

Maximum inrush current

For most electrical devices, the starting current (starting current) exceeds the rated current. Although this process is short-term, it can cause an increase in the cost of electricity for the enterprise. Depending on the tariff used, a power supply company may charge a monthly fee not for the nominal, but for the maximum power consumption. Excess can make up to 30% of the monthly cost of electricity.

Short-time voltage drop

In power supply systems, the voltage can be reduced relative to the rated value. This leads to the fact that motors and other devices consume a current that exceeds the nominal value, which can cause them to fail and reduce efficiency.

Power factor reduction

The power factor represents the ratio of the active power to the full power. The presence of reactive loads in the system (motors, pumps, heating devices, ventilation and air conditioning) leads to an increase in reactive power and a decrease in the power factor. Since reactive power is not consumed by the load (energy is exchanged between the source and the consumer), the efficiency of the system therefore decreases.

Depending on the specific system, the elimination of the problems described above can save 10-40% of energy, depending on the degree of each of the negative factors. In practice, a large number of technical solutions have been developed to deal with these problems. The main drawback is that each of the devices is designed to solve one of the listed problems.

The key advantage of the offered technical means is that at correct installation the solution of all problems in any networks is provided.

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Network Energy Saving Unit

Characteristic Description Advantages for the consumer

The main functions of SAV

Characteristic
Description
Advantages for the consumer
1. Control module with iterative transformer (Patent, Russia) Evenly distributes the load, provides an increase in the power factor. Thus, increasing the percentage of the used power of the supply network Reduces power consumption (at least 11%)
2. Harmonic distortion reduction Patented Active Harmonics Filtering Technology Improves electromagnetic compatibility of the supply network and load
4. Power factor correction Means of reducing reactive power Provides reduced reactive power, increased percentage of energy used and lower load current to provide the required power
5. Phase Balancing Provides uniform loading for each phase Provides energy savings
The Network Energy Saving Unit (NESU SAV) is designed and developed to reduce the impact of the above negative factors.
NESU SAV is a unique solution, provided with functionality and has no analogues in the industry.

NESU SAV implements 5 functions in a single block:

  1. 1. Power factor correction
  2. 2. Filtration of harmonics
  3. 3. Phase balancing
  4. 4. Limitation of the maximum inrush current
  5. 5. Compensation of short-term voltage drop

There is a fairly large range of devices designed to adjust the power factor. Depending on the purpose, the range of these devices can start from large capacity drives that are connected directly to the main switchboard to provide the required power parameters for buildings, to small individual drives in box-type design that are connected to specific loads within the building. Many statements have been made about the possibility of saving energy with the help of these devices, however, the adjustment of an individual power factor does not guarantee energy savings.

The NESU SAV device provides a comprehensive solution to the above problems, one of which is the power factor correction. Below is provided information on the principles of SAV operation, with the main focus on energy savings.

Functionality of NESU SAV

As mentioned earlier, NESU SAV implements 5 key functions. A significant reduction in energy consumption is ensured by the joint implementation within a single device of a set of specified functions, rather than each of the functions separately.

NESU SAV is an electronic device without moving parts that control its operation. Unique advantages are provided by the iterative control transformer. This device interacts with all other parts, providing significant energy savings.

Technical Overview

The main connection of the NESU SAV is made to the main or auxiliary shield on the load side via an additional fuse. The remaining connections include a neutral wire and at least one high-quality grounding system.

The following components are included between the primary and neutral lines:

  1. At least one input capacitor
  2. Technical resources for energy saving and improving the quality of power consumption
  3. Surge suppressor for suppressing unwanted power surges
  4. Inductance / transformer
  5. At least one resistor with variable resistance (varistor) based on metal oxide
  6. The second cascade of capacitors
  7. Restrictive circuit
  8. Voltage surge Limiter

These components can be placed to work as a single-phase device. You can duplicate components and create two sets to connect to two phases. You can also create three connected components to operate as a three-phase device.

NESU SAV also includes a double iterative transformer, which consists of two round magnetic cores with counter-reeled windings. An iterative transformer means that the transformer acts as a double choke or clamp and is able to solve several energy tasks simultaneously during milliseconds by performing adjustments with subsequent adjustments to the results obtained with previous adjustments. In other words, the location of these components in the NESU SAV and specialized transformers provides the means and possibilities for correcting the emerging power quality defects. In addition, the proposed systems, devices and iterative transformers operate over a wide frequency range from 30 to 100 Hz. NESU SAV can be installed in various versions with a large number of different types of load, while the interaction mechanism will depend on the type of load. As specific devices can be generators, solar converters, as well as other devices that are characterized by the above described problems with energy quality.

Operation of NESU SAV

The NESU SAV is connected via an additional fuse on the load side to the main or auxiliary switchboard. With this connection, the NESU SAV is placed parallel to the main load. If there are several shields or transformers within the structure, it is required that the NESU SAV of the appropriate power be located on each switchboard or on the output side of the transformer on the load side. NESU SAV is not connected to the load via a transformer. The NESU SAV must be connected to a neutral wire, as well as to a high quality grounding system, preferably a dedicated ground for this purpose. It is necessary to follow national and regional rules and standards for the operation of electrical installations.

The basis of functioning NESU SAV is the smallest resistive element in the electrical system for which it is installed. As a result, all active power through the NESU SAV is transferred to the load. Thus, the need to connect an autonomous NESU SAV to each load in a common system is eliminated, as it is implemented in a number of competitive solutions. Being connected to the main switchboard or following the transformer, the NESU SAV (which may include several modules) is able to provide a high quality power for the whole structure.