UA82727C2 - Device for compensation of three-phase voltage of a consumer - Google Patents

Abstract

A device for consumer’s three-phase voltage compensation may be used for reducing the unbalance ratio of consumer’s line voltage in low-voltage three-phase distribution mains 0.38 kV. The device is equipped with a converter of six-phase, twelve-phase, eighteen-phase, and four-and-twenty phase voltage system in a three-phase one, a zero phase of one or more input systems are united with one of line phases of consumer’s network. Clamps of two line and zero phases of supply main are connected with similar clamps of consumer’s network. The third line phase of supply network by means of one power key is connected to one phase of six-phase and/or twelve-phase, eighteen-phase, four-and-twenty phase voltage systems, the zero phase of which is connected to the third line phase of consumer’s network. A resistor reducer of zero sequence of consumer’s network is mounted in phase converter. When unbalance appears in supply voltage of supply main the power key is disconnected, the third line phase of consumer’s network is powered the from the resistor reducer of zero sequence of consumer’s network. After transient processes in circuits of device have finished the power key turns on with delay. The serial number of the key is determined by a control unit that transfers power supply of the consumer’s third phase to the phase converter. As a result of this commutation unbalance of line voltage goes down and, later is positioned in given limits.

Description

The device for balancing three-phase voltages belongs to electrical engineering and power engineering. It is designed to reduce the asymmetry of line voltages in high-voltage and low-voltage three-phase networks, including distribution four-wire networks. The device can be used to adjust the asymmetry coefficient according to the reverse sequence of three-phase voltages, for example, to power three-phase motors and other consumers, receivers sensitive to the asymmetry of three-phase voltages.

A known device for balancing the consumer's three-phase voltages (|, which has a three-core magnet wire, on each of which the first and second windings are placed. The first winding, which is placed on one rod, and the second winding, which is placed on the second rod, are connected in series with each other. Three such series connections are switched on in a star and connected by rays to the linear phases of a three-phase network. The common point of the star is connected to the zero phase of the network. The device satisfactorily balances the phase voltages. The disadvantage of the device is that the device cannot fundamentally balance the line voltages of the network.

Known devices for balancing three-phase voltages (2-5), which include inductors (chokes) and capacitor banks, are included between the linear phases of the network. Among such devices, the Steinmetz scheme |21 is the most famous. In general, such devices include six adjustable elements, of which three are inductors, and the other three are capacitor banks. Such devices satisfactorily balance the line voltages of a three-phase network. Disadvantages of such devices: difficulty in making adjustable inductors and capacitor banks; high cost of the device.

Known devices for balancing three-phase voltages 6-9), which include main three-phase transformers and additional three-phase transformers, switching switches and a control unit. Three-phase main and additional transformers have various connection schemes between themselves and the network.

For example, the windings of the main and additional transformers can be connected to each other according to a T-shaped scheme. These devices have satisfactory adjustable characteristics of the degree of symmetry of line voltages. Disadvantages of the devices: the relatively large installed power of the main and additional transformers, the insufficiently rigid external current-voltage characteristic and the insufficient reliability of the operation of the control units.

The closest analogue (prototype) of the claimed device is a device for balancing voltages in a three-phase four-wire network with a blind grounding of the neutral (101, which contains the clamps of the linear phases of the supply network and the clamps of the linear phases of the consumer, a three-phase transformer, three single-phase step-up transformers, power switches and control unit. The device has 2595-3095 less installed power than previous devices. Disadvantages of the device: interruptions in the power supply of the receiver of electrical energy when switching power switches; large (double) installed power; inaccuracy of the operation of control units. The latter is explained by the fact that the symmetry of linear voltages is achieved by phase-by-phase control in each phase separately, provided that all three line voltages change independently of each other, chaotically according to random laws.

In this regard, the task was set to ensure continuity of power supply when switching power switches in the process of achieving symmetry of linear three-phase voltages, to reduce the installed power of the device and to increase the reliability of the control unit.

The task is solved by carrying out switching of keys in only one phase, namely due to the fact that: to the device for balancing the three-phase voltages of the consumer, which contains the clamps of the linear and zero phases of the three-phase supply network and the clamps of the linear and zero phases of the three-phase consumer network, power switches and the control unit, as well as a three-core magnet wire, on each core of which there is one mains winding with terminals, these windings are connected to each other in a triangle, the two vertices of which are connected one to the first two linear phases of the power network, six first additional windings are added and six second additional windings, as well as seven keys, the first six additional windings are placed two on each core of the magnetic conductor, of which each one winding, which is located on one core of the magnetic conductor, is connected to one winding by the terminals of the same name (for example, start to start) , located on the other rod of the magnetic circuit, three such consecutive connections of two windings are connected to each other in a three-ray star, the common point of which is connected to the terminal of the zero phase of the supply network, and the three extreme terminals of the star are connected one to the terminals of the network windings connected in a triangle, each terminal of the first and second linear phases and the terminal of the zero phase of the power supply network, one is connected to one of the two clamps of the same two linear phases and the zero phase clamp of the consumer network, the six second additional windings are placed two windings on each rod and are connected to each other in a six-ray star, the common point of which is connected to the clamp of the third linear phase of the network consumer and to the third vertex of the triangle formed by the network windings, the clamp of the third linear phase of the supply network is connected to the first terminals of all power keys, and the second terminal of each key is connected one by one to one of the terminals of the six second additional windings, the complex potentials of which form a six-phase voltage system, and to the third vertex of the triangle formed network windings, the power network clamps are connected to the input of the control unit, and the output of the control unit is connected to the key unit.

Each of the three windings belonging to the first six additional windings is connected one to a part of each of the mains windings connected in a triangle, and each mains winding is made with an intermediate terminal that divides it in the ratio 1:2 by the number of turns .

Each of the six second additional windings is made with two intermediate leads, the first of which divides each of them in the ratio 0.5:0.5, and the second intermediate lead divides them in the ratio 37172:(1-37172), adding twelve additional windings to the device power keys and six third additional windings, one first terminal of each of which is connected to one second intermediate terminal of one of the six second additional windings, and the second terminal of each of the six third additional windings is connected to one second terminal of six of the twelve additional power switches, and the first terminals of these additional power switches are connected to the third phase of the power network, each first terminal of the seven keys is connected to the third linear phase of the power network, each second terminal of these keys is connected one by one to one first intermediate terminal of each of the six second additional windings and the third linear phase of the consumer's network, each first output of the second six of the twelve additional keys is connected to the third of the phase of the power supply network, each second terminal of these keys is connected one by one to one second terminal of each of the six second additional windings.

Three of the six second additional windings are made with two intermediate terminals, the first of which divides each of the six second additional windings in the ratio 0.5:0.5, and the second - divides in the ratio 3712:(1-372), and the other three with six second additional windings are made with one first intermediate terminal that divides each of the three second additional windings in the ratio of 0.5:0.5, each terminal of the seven keys is connected to the third linear phase of the power network, each second terminal of the seven keys is connected one to of one first intermediate terminal of six second additional windings and to the third linear phase of the consumer network, twelve additional keys and six third additional windings are added, each second intermediate terminal of three of the second six additional windings is connected one to two terminals of the third additional windings, each first terminal of the first six of the twelve additional keys are connected to the third linear phase of the power network, every second terminal of these keys is connected one to one terminal six second additional windings, each first terminal of the second six of the twelve additional keys is connected to the third linear phase of the power network, each second terminal of these keys is connected one to one terminal of the six third additional windings.

An eighteen-phase to three-phase voltage system converter and eighteen second additional keys are added to the device, the first terminals of which are connected to the third linear phase of the power supply network, the second terminals of these keys are connected to the linear phases of the eighteen-phase voltage system to three-phase converter, and the zero phases of multiphase systems are connected between themselves and connected to the third linear phase of the consumer's network.

Let's consider graphic materials.

Figure 1 shows a block diagram of a device for balancing three-phase voltages with a converter of a six-phase voltage system into a three-phase system and a separate implementation of a zero-sequence resistance reducer of the consumer network.

Figure 2 shows a block diagram of a device for balancing three-phase voltages with a converter of a six-phase voltage system into a three-phase one and a combined implementation of a zero-sequence resistance reducer of the consumer network with a phase converter.

Figure 3 shows a block diagram of a device for balancing three-phase voltages with a converter of six-phase and twelve-phase voltage systems into a three-phase system and a combined implementation of a zero-sequence resistance reducer of the consumer network with a phase converter.

Figure 4 shows a topographical image of a phase converter with a combined implementation of the conversion of six-phase and twelve-phase voltage systems into a three-phase one.

Fig. 5 shows a topographical image of a phase converter with a combined implementation of the transformation of six-phase and twelve-phase voltage systems into a three-phase one with phase-to-phase symmetrical transformation of phases.

In Fig. 1 are marked: A, B, C, 0 and Ac, Bs, Cs, Os - phase clamps of the three-phase supply network and clamps of the consumer's three-phase network, respectively; 1 - block of power keys; 2 - a converter of a six-phase voltage system into a three-phase voltage system; C - control unit; K1, K2, KZ, ..., K7 - power keys; AT, A2, AZ,..., Ab - linear phases of the six-phase voltage system; 4, 5, 6 - nodes of connections of two windings connected by terminals of the same name.

Figure 2 shows: 7, 8, 9 - the intermediate output of the mains winding when the zero-sequence resistance reducer is combined with a phase converter; the rest of the designations coincide with the designations of Fig. 1.

Fig. 3 shows: 10, 11, 12 - smaller parts of network windings; 28, 29, 30 - larger parts of network windings; 7, 8, 9 - intermediate nodes that divide the network windings into smaller and larger parts in the ratio 1:2; 31-36 - the first intermediate outputs of the six second additional windings; 13-18 - second intermediate outputs of six second additional windings; 22-27 - six third additional windings; A7-A18 - linear phases of the twelve-phase voltage system of the phase converter; Kv-K19 - additional power keys; the rest of the designations coincide with the designations of Fig. 1 and Fig. 2.

In Fig. 4, the designations coincide with the designations of Fig. 1 - Fig. 3.

In Fig. 5 are marked: 37, 38, 39 - connection nodes of one second intermediate output of three of the six second additional windings, one with two outputs of two of the six third additional windings; the rest of the designations coincide with the designations of Fig. 4.

Composition of the device. The device consists of (Fig. 1): clamps A, B, C, 0 of the power three-phase network and clamps Ac, Vs, Cs, Os of the consumer's three-phase network; block of power keys 1, which consists of seven keys K1-K7; converter of phases 2 of a six-phase voltage system into a three-phase one; control unit With power keys. In turn, the phase converter 2 consists of a three-core magnet wire, on each core of which there are: three mains windings AB, VS, CA, six first additional windings A4, 40, B5, 50, Сб, 60 and six second additional windings АТас, А2Ас, AZAs, A4As, A5As, AbAs.

The first six additional windings are placed two on each magnetic core; so for example

A4 and 50 are placed on the same rod, as can be seen from the parallelism of the voltage vectors on them. Each winding from among the first additional ones, which is placed on one rod, and each winding, which is placed on another rod, are connected to each other by terminals of the same name, for example, windings A4 and 40. Three such serial connections of two windings A40, B50, Сб60 are connected in a three-ray star, the common point of which 0 is connected to the clamp 0 of the zero phase of the power supply network, and the three extreme terminals A, B, C of the star are connected one by one to the terminals of the network windings connected in a triangle. Each clamp of the first B and second C linear phases and clamp 0 of the zero phase of the supply network are connected one by one to one of the clamps of the consumer network phases of the same name Bc, Cs and Os, respectively.

Six second additional windings are placed two windings on each rod, for example, AgAs and

A5As and are connected to each other in a six-ray star, the common point of the star is connected to the terminal As of the third linear phase of the consumer network and to the third vertex of the triangle formed by the network windings AB,

VS, SA. Clamp A of the third linear phase of the power supply network is connected to the first terminals of all power keys K1-K7, and the second terminal of each key is connected one by one to one of the terminals A71-Ab of the six second additional windings, the complex potentials of which form a six-phase voltage system, and to the third vertex AC connections of network windings in a triangle. Mains terminals A, B, C and 0 are connected to the input of the control unit 3, and the output of the control unit is connected to the switch unit 1.

Operation of the device. The operation of the device is controlled by the control unit 3. If there is no asymmetry of the linear voltages in the supply network A, B, C, the control unit includes the power switch K7, which supplies a symmetrical system of voltages to the consumer network Ac, Vs, Cs, 0s. The control unit Z constantly measures the modules of the three linear voltages AB, VS, CA of the power supply network at certain intervals. Based on the modules of these voltages, block Z calculates the module and the phase angle of the vector Shg of the voltage of the reverse sequence of the supply network. Based on the value of this vector, the control unit C calculates the serial number of the key that must be turned on to achieve symmetry of the consumer's network voltages, and sets the procedure for switching the power keys.

So, if the asymmetry of the three-phase supply network voltages changes in magnitude and phase, then after a certain period of averaging the measurement results, the control unit records an unacceptable deviation of the supply network voltages from the symmetrical mode, after which the control unit issues a command to disconnect the K?7 key from the supply network and executes her. As a result, the power switch K7 breaks the electric circuit that feeds the switched phase Ac of the consumer from the power supply network. But the consumer does not feel a loss of voltage in the switched phase Ac, because after turning off the key K7, the voltage in Ac comes from the zero-sequence resistance reducer formed by the first six additional windings A4, 40, B5, 50, Сb, 60, placed on the rods of the magnet wire. After the end of the transient processes, which occurred after the interruption of the electric circuit, the power switch is turned on with a delay, the serial number of which is determined by the control unit 3, for example, K5. In the future, the procedure of the described control process is repeated.

In the second variant (Fig. 2) of the device for balancing three-phase voltages of the consumer, each of the three windings A4, B5 and Сb, which belong to the first six additional windings, is combined one by one with a part of one of the three windings АСВ, ВС and САs, respectively . The latter are connected in a triangle. For such a combination, each winding from the number connected in a triangle is made with an intermediate output, for example, 7, which divides it in the ratio 1:2 by the number of turns.

In the third variant (Fig. 3) of the device for balancing the consumer's three-phase voltages, each of the six second additional windings is made with two intermediate outputs, the first of which, for example, 31 divides each of the six second additional windings in the ratio 0.5:0.5 , and the second, for example, 18 - divides in the ratio 3772:(1-3772). In the third version, twelve additional keys K8-K19 and six third additional windings 22-27 are added to the device. The initial terminals of three windings 24, 25, 26 are connected one by one to one second intermediate terminal 14, 16, 18, respectively, of one of the six second additional windings. The end terminals of three windings 22, 23, 27 are connected one by one to one second intermediate terminal 13, 15, 17, respectively, of one of the six second additional windings. The second output of each of the six third additional windings is connected one by one to one second output of the first six additional power keys 7, 9, 11, 13, 15, 17, and the first outputs of these additional power keys are connected to the first outputs of the AT1-Ab power keys . Each first output of additional keys A7-A1T8 is connected to the third phase A of the power network. Each second output A7-AT2 of six additional keys is connected one by one to one first intermediate output 31-36 of each of the six second additional windings. Each first output of six additional keys K8, KTO, K12, K14, K1I6, KI8 is connected to the third phase of the power network, and each second output of six additional keys Av, A10, A12, A14, A16, A18 is connected to one second output of each from six second additional windings, for example, A1T8As. The second output of the K19 power switch is connected to the third phase AC of the consumer's network.

For a better understanding of the essence of the third version of the device for balancing three-phase consumer voltages, Fig. 4 shows a topographical image of phase converter 2 with a combined implementation of converting six-phase and twelve-phase voltage systems into three-phase. The six-phase voltage system is presented in the form of six linear phases A1-Ab, and the twelve-phase voltage system is presented in the form of twelve linear phases A7-A18. Both named voltage systems are transformed into a three-phase voltage system with linear phases Ac, B and C. Zero phases of the six-phase and twelve-phase voltage systems are combined and connected to one linear phase Ac of the consumer's network. With a symmetrical system of three-phase consumer voltages, the hodograph of phases A1-Ab of a six-phase system is a circle with center As. Phases A7-

A18 are placed phase-symmetrically on the sides of a symmetrical hexagon with center As. Note that phases A1-A1T8 and A1-19 evenly cover the plane of the topographic image with points equidistant from each other.

In the fourth embodiment of the device for balancing the consumer's three-phase voltages, three of the six second additional windings are equipped with the first intermediate terminal, the other three of the six second additional windings are equipped with the first and second intermediate terminals. The peculiarity of this variant of execution consists in changing the order of connections of the windings of the phase converter compared to the third variant of execution. Fig. 5 shows a topographical image of the converter of six-phase and twelve-phase voltage systems into three-phase, made according to the fourth version of the device. In this variant, the phase converter is made with a phase-symmetric phase transformation. The connection points of the ends of the windings of the ninth (AB), thirteenth (A13) and seventeenth (A17) phases are moved from points 14, 16 and 18 (third option, Fig. 4) to points 37, 38 and 39, respectively (fourth option, Fig. .5).

The essence of the invention is that for each voltage vector of the reverse sequence within the symmetrization region determined by the extreme phases of the twelve-phase system, with the help of the control unit, it is always possible to choose such phase Ah among phases A1-A19, the position of which will be close to the position of phase A of the power network . With an exact match between Ah and A, complete symmetry of consumer voltages is ensured. The voltage of the reverse sequence at the maximum mismatch between Ах and А is proportional to the segment АТ Ас/б.

The efficiency of the device. In the majority of distribution networks, the coefficient Kgy of voltage asymmetry in the reverse sequence is less than 295 (GOST 13109-97|. But in 1095-1595 distribution networks, the coefficient K2y with a probability greater than 595 exceeds the normally permissible value of 295 and reaches values of 2.595-1095.

In addition, a number of high-efficiency equipment, for example, asynchronous motors of foreign production, require a reduction of the Kgy coefficient to the level of 1.095.

Based on the real asymmetry (2.595-1095) of linear voltages in distribution networks and the increased requirements for the symmetry of the supply voltage, the use of the device in this way makes it possible to reduce the level of asymmetry to 0.595-295.

In some cases, the coefficient of Kgy of voltage asymmetry in the reverse sequence exceeds 1095. In these cases, it is necessary to use the version of the device according to this method when converting not only a six-phase and twelve-phase, but also an eighteen-phase, and sometimes twenty-four-phase voltage system into a three-phase one. In such cases, the multiplicity of reduction of the voltage asymmetry factor in the reverse sequence can reach 7-9, which satisfies the demands of practice. The table shows the dependence of the multiplicity of the reduction of the asymmetry of the consumer voltages with an increase in the number of multiphase voltage systems at the input of the phase converter 1.

Table

In linyut (10000000 І Multiplicity of reduction of multi-phase types of phase transformation of pveapry. voltages of the consumer et 5-53:12-53 І 5 6-23: 12-38: 18-»3 | 7 8-3 3;12-z 318-353 8

The device made according to the third option has the smallest relative installed capacity.

Checking the effectiveness of the device. The effectiveness of the device was tested on a mathematical model, which confirmed the fulfillment of the requirements and characteristics of the device.

Field of application. The device according to this method is advisable to use in cases where the coefficient of voltage asymmetry in the reverse sequence in the power distribution three-phase network does not satisfy either the current standards or stricter operational requirements in terms of voltage asymmetry of the power supply network. Such a device, in addition to balancing the line voltages of the network, also balances the phase voltages.

Reference sources 1. Muzychenko O.D., Muzychenko Yu.O., Muzychenko 0.0. Zero-sequence current filter. Patent of Ukraine,

Me34226A, НО2НОО7Т/08, 2001. Byul. Me1. 2. Shidlovsky A.K., Muzychenko O.D. Balancing devices. - Kyiv: Technika, 1970, p. 164. 3. Aidpeg M. Oie Zutteiizivetypd ipzutteigizspreiavivieg Ogepzigotpeigep digsp hypepaye A!yz-dieiIspKgeyive. -

ET, 1936, 57, M 34; 35, 5.971-974; 997-1002. 4. Vadegh MU. Oye Shtmapashpo deg Eiprpazepiavi ip zutteiizspe Ogenvigotiavi. - ET, 1950, 71, M 12, 5.302-305. 5. I.V. Zhezhelenko, I.Y. Rabynovych, V.M. Bozhko. The quality of electrical energy at industrial enterprises. Kyiv. - "Tehnika" publishing house. - 1981. - 160 p. b. Karzhavov B.N., Brodovsky V.N., Rybkin Y.P., Herutsky H.M. Device for symmetrization of three-phase voltage. Author's certificate of the USSR, Mo741371 NOgOZ/26, 1980. 7. MeSiaip datez E., Z5Koi Nomaga. US patent Me4288737, СО5Е1/34, September 8, 1981. 8. Nepkei, hey. AI. Oemise tog sopigoi oi (Pe ehsiiyaop sigtepi yog 5 Ipgee rpase depegayog. US Patent Mob791301.

Publ. 9.9.2004. 9. Takiaipep, emaiI. Sotrepzayop teipoi yog a moiade ipraiapse. US patent Mob6972976, published on 12/66/2005. 10. Belousov V.S., Zolotareva O.P. Device for symmetrization of three-phase voltage in three-phase networks with blind grounding of the neutral. Author's certificate of the USSR, Mob17797, NOgi3/26,

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Claims (5)

1. A device for balancing three-phase consumer voltages, which contains clamps of linear and zero phases of the three-phase supply network and clamps of linear and zero phases of the three-phase consumer network, power switches and a control unit, as well as a three-core magnet wire, on each core of which there is one mains winding with terminals, these windings are connected to each other in a triangle, the two vertices of which are connected one each to the first two linear phases of the supply network, which differs in that it has six first additional windings and six second additional windings, as well as seven keys, while six of the first additional windings are placed two on each rod of the magnetic conductor, of them each one winding, which is located on one rod of the magnetic conductor, is connected by the terminals of the same name (for example, start to start) with one winding located on the other rod of the magnetic conductor, three such in series with the connections of the two windings are connected to each other in a three-ray star, the common point of which is connected to by the terminal of the zero phase of the supply network, and the three extreme terminals of the star are connected one each to the terminals of the network windings connected in a triangle, each terminal of the first and second linear phases and the terminal of the zero phase of the supply network are connected one to one of the two terminals of the same two linear phases and terminals of the zero phase of the consumer network, six second additional windings are placed two windings on each rod and are connected to each other in a six-ray star, the common point of which is connected to the terminal of the third linear phase of the consumer network and to the third apex of the triangle formed by the network windings, the terminal of the third linear of the power network phase is connected to the first terminals of all power switches, and the second terminal of each key is connected one by one to one of the terminals of the six second additional windings, the complex potentials of which form a six-phase voltage system, and to the third vertex of the triangle formed by the network windings, the power network clamps are connected block to the entrance and control, and the output of the control unit is connected to the key unit. 2. The device according to item I, which differs in that each of the three windings belonging to the first six additional windings is connected one by one with a part of each of the mains windings connected in a triangle, and each mains winding is made with an intermediate a conclusion that divides it in the ratio 1:2 by the number of turns. 3. The device according to paragraphs And 2, which differs in that each of the six second additional windings is made with two intermediate terminals, the first of which divides each of them in the ratio 0.5:0.5, and the second intermediate terminal divides them in the ratio 372:(1 -372 ), and additionally has twelve additional power switches and six third additional windings, one first terminal of each of which is connected to one second intermediate terminal of one of the six second additional windings, and the second terminal of each of the six third additional windings is connected to one connected to one second terminal of six of the twelve additional power switches, and the first terminals of these additional power switches are connected to the third phase of the power network, each first terminal of the seven keys is connected to the third linear phase of the power network, each second terminal of these keys is connected to one first intermediate output of each of the six second additional windings and the third linear phase of the consumer network, each first output of the second six 13 twelve d of the two-way keys is connected to the third phase of the power network, each second terminal of these keys is connected to one second terminal of each of the six second additional windings. 4. The device according to paragraphs | and 2, which differs in that three of the six second additional windings are made with two intermediate terminals, the first of which divides each of the six second additional windings in the ratio 0.5:0.5, and the second - divides in the ratio 377:(1 -372), and the other three of the six second additional windings are made with one first intermediate terminal, which divides each of the three second additional windings in the ratio of 0.5:0.5, each terminal of the seven keys is connected to the third linear phase of the supply network, each the second output of the seven keys is connected one by one to one first intermediate output of the six second additional windings and to the third linear phase of the consumer network, and additionally has twelve additional keys and six third additional windings, each second intermediate output of three of the six second additional windings is connected one by one to two terminals of the third additional windings, each first terminal of the first six of the twelve additional keys is connected to the third linear phase of the power network, each second terminal of x keys are connected one to one terminal of six second additional windings, each first terminal of the second six of twelve additional keys is connected to the third linear phase of the power network, each second terminal of these keys is connected one to one terminal of six third additional windings. 5. The device according to claims 1-4, which is characterized by the fact that it additionally has a converter of the eighteen-phase voltage system into a three-phase system and eighteen second additional keys, the first terminals of which are connected to the third linear phase of the power network, the second terminals of these keys are connected to the linear phases of the eighteen-phase system converter the voltage is three-phase, and the zero phases of multiphase systems are interconnected and connected to the third linear phase of the consumer's network.