How to choose and connect a voltage regulator

Today we will talk on a sore subject on the example of high-precision voltage stabilizers of the company ETK Energy. This company has provided a detailed list of characteristics, by the example of which we can safely tell readers about the nuances. Let's see how to choose and connect a voltage regulator.

Types of

stabilizers When ETC Energy says that voltage regulators combine the advantages of relay and electromechanical( brush) stabilizers, it is simply useless to tell how stability of 3% is achieved within the range from 144 to 256 V. It is clear thatthe consumer is entitled to know the details. So, voltage regulators are divided into four types.


The mentioned electromechanical are based on an autotransformer. Input and output windings have a common point. The number of turns varies with the help of a brush sliding on the contact surface. A special servo drive is controlled by an input voltage meter. With increasing brush moves in one direction, with a failure in the opposite. As a result, the output voltage parameters remain approximately constant.

Electromechanical Stabilizer

It is worth highlighting the features:

  1. Disadvantages. Minus: in practice, sharp jumps are possible, and the servo drive is powered from the industrial network. If there is a failure, there is a breakdown of speed. As a result, the load is under voltage that goes beyond what is permitted plus or minus 10%.A negative point in electromechanical stabilizers is the presence of brushes that require periodic maintenance.
  2. Dignity. It is electromechanical stabilizers that are characterized by maximum accuracy and stability reaching 3%, which we see in the case of ETC Energy products. Electromechanical voltage regulators are good in areas where the voltage is steadily increased or decreased.


These voltage regulators are based on a change in the number of turns of the transformer winding abruptly. Mechanically switchable contacts are used for this. The minus is visible immediately - the output parameters vary in steps. But it is possible to achieve the necessary deviations, according to GOST, plus or minus 10% from the nominal. Relay stabilizers are characterized by excellent speed, even in the presence of a jump at the input, they almost instantly correct the situation. What we see on the example of ETC products Energy: the regulation time does not exceed 20 ms / V.

The figure refers to the electromechanical part. The sign "no more" indicates that abrupt changes are blocked instantly by a relay. The response time is unclear. It is possible that energy stabilizer ETC Energy does not provide protection. Then sharp jumps and noise will begin to pass to the output, loading the input load filters. On this occasion, the instructions silent.

Stabilizer Relay Type


These voltage regulators are known as thyristor. More often they are built on the basis of inverters, where the input current is rectified, then converted back to alternating, with the necessary parameters. Possible scenario: electronic keys are used in the valve mode, forming a kind of relay voltage regulator. In the latter case there are no moving parts, the probability of failure is sharply reduced. And the main advantage arises: electronic stabilizers are silent, except for the hum of the current of industrial frequency in transformers. The latest element base allows you to achieve increased accuracy. In the future, all current stabilizers are likely to become electronic.


Such current stabilizers are based on the phenomenon of a change in the resistance of the resonant circuit. In this case, the input is choke. Its resistance explicitly depends on the input current and voltage. The jump becomes higher, which reduces the gear ratio of the device as a whole. It is important to choose the right parameters.

Obviously, the control range in this case is not as large as that of ETC Energy Voltage Stabilizers( from 100 to 286 V), however, the design has no moving parts. Losses in the resonant circuit cannot be considered as useful, therefore the efficiency of the stabilizer is not high( ETC Energy guarantees 98%).Therefore, acquiring a similar type of device, it is better to inquire in advance about the control range, the output power. Of course, the efficiency is taken into account.


Characteristics of ETC stabilizers Energy

  • ETC energy produces single-phase and three-phase stabilizers, there is no mention whether protection is present in the second case.

Implied protection against loss of any phase. Then a number of devices fail, if you do not remove the power entirely. The question is carefully omitted in the instructions. Our readers are entitled to know that three-phase equipment often fails in a similar situation. Protection issues should be discussed before purchasing a voltage regulator, and not after.

  • A curious feature of ETK Energy products is the ability to work in bypass mode.

This activates the bypass circuit. If the mains voltage does not go beyond the permitted limits( according to GOST 220-230 V plus or minus 10%), the bypass is turned on. The load receives power directly from the industrial network - sockets. This obviously saves equipment life, there are prerequisites for the purchase of such voltage stabilizers by people who do not need his work 100% of the time, but who want to protect consumers from the nuances of Russian reality.

  • Security issues are considered important. ETC Energy separately reports that it is possible to switch on voltage stabilizers for any TN system.

The protective conductor can be separate or combined with zero working. This achieves compatibility with systems put into operation in the USSR, and at the same time there are no contradictions with the current state. It is permissible to use TN-C, where the protective and working neutral conductors are combined, or the latest brand TN-S with their complete separation. Finally, buildings that have undergone reconstruction according to EIR are more often characterized by the TN-C-S grounding system. Then work with voltage stabilizers ETC Energy is allowed!

We remind you that in the TN-C-S system the protective and neutral conductors at the entrance to the building are sometimes combined. For example, in the area of ​​the ground loop of the lightning conductor( which is more often done).At the outlet of the ETC device Energy recommends the use of IT system - local grounding. The owner is better to worry about the equipment grounding yourself. In addition, the corresponding lobe is present on the body of the voltage regulator itself.

  • The most important characteristic of any voltage stabilizer is the output power. In the above case, the devices support values ​​of 3 - 60 kVA.

Only active power is counted. It is surprising to find a stabilizer or generator that gives an imaginary one. Note that the active power is spent on useless losses in the reactive load. Therefore, the ETC voltage stabilizer The energy inside contains compensating capacitors( the maximum reactive no-load current is 30 μA).The choice of voltage regulator depends largely on the output power. And you need a stock.

If we talk about voltage stabilizers ETC Energy, it is possible to overload 130%( it’s not quite clear how many amps the limit is exceeded, by a third or twice. Probably the first) by 10 minutes. Then the device turns off. It is known that asynchronous motors at start-up are able to consume currents 5-10 times higher than the nominal. For collector is not so important. Any generator allows a short-term increase in current to infinity( this is not a publicity stunt, as written in the instructions), as for the ETC Energy voltage regulators, this moment is thrown out of consideration. If there are asynchronous motors on the farm, it is recommended to clarify such issues before purchasing the device.

  • PUE pays great attention to security issues. It is said that consumers of “wet” places or working in outdoor conditions are connected via a differential automaton.

Products from ETK Energy

The ETC Energy also takes on a similar method. In this case, the connection of a voltage regulator through a differential circuit is considered a mandatory measure of protection. The response threshold is standard for RF - 30 mA.As a recommended measure, ETC Energy recommends the use of differential protection machines at the output( before loading).This ensures the safety of equipment operation. The use of differential machines does not please because of the high cost, it is terrible to imagine how much such a thing costs 60 kW.

  • The weight and dimensions of a voltage regulator rarely become decisive factors.

ETC Product Energy per 3000 VA shows a weight of 12.8 kg( single-phase version), one will inevitably think whether to take a thing to the country. Weight does not always become crucial. Remember, a powerful differential machine is also not easy, do not forget to add a place in your backpack.

  • Technical characteristics of voltage regulators are reduced to the quality of the output voltage.

For example, the ferromagnetic form is capable of very different from the sinusoidal, please note when choosing. Usually manufacturers indicate in the technical documentation( data sheet) deviations from the nominal value in a certain direction. For example, the principle of operation of the voltage stabilizer ETK Energy allows to classify devices as accurate: in a wide range figures are achieved that exceed the requirements of GOST.

  • A voltage regulator connection is planned to achieve power to the load; protection against short-circuit current is required.

If there is no differential automatic at the output or a RCD, the device to be purchased must provide the necessary parameters. For example, in ETC products, Energy has its own automatic switch. It is recommended to choose the types of voltage stabilizers that are not able to fail, if the child, while playing, closes the wiring. At the same time, victims of such actions are unacceptable.

We hope that readers will now be able to independently connect a voltage stabilizer. We remind you that the three-phase models are intended for industrial use. If you plan to feed 220V equipment in this way, take the trouble to load all branches equally. It is possible to choose a voltage regulator at

The portal allows the selection of parameters. For example, here are all the types of technology described above.

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