RU2294063C1 - Method, sensor, and system for measuring heavy current in bus assembly of furnace-transformer short network - Google Patents

Abstract

FIELD: electric measurement technology; electric-arc furnaces including ore heating and steel smelting furnaces and heating ovens.

SUBSTANCE: proposed method for measuring heavy AC current in bus assembly of furnace-transformer short network includes disposition of at least one magneto-sensing component incorporated in current sensor design interacting with magnetic field set up by current carried by buses and connection of current sensor leads to measuring device; heavy current being measured is passed through opposing buses or bus sections in opposite directions. Sensor has at least one magneto-sensing component placed in space between specularly disposed surfaces of buses and provided with one or more turns of electricity conducting material placed in space so that turn planes are approximately perpendicular to specularly disposed bus planes and approximately parallel to current flow direction in bus. Sensor can be wound on nonmagnetic or ferromagnetic linear core. Desired quantity of magneto-sensing components in system is found from equation

where K is total number of magneto-sensing components incorporated in sensor; q_i is quantity of magneto-sensing components installed in i^th space; n is quantity of bus pairs in bus assembly; ; magneto-sensing components are interconnected in series or in parallel; measuring device has unit for matching signal picked off sensor with characteristic of measuring device input circuits.

EFFECT: facilitated heavy-current measurement procedure, improved design of sensor and measuring system.

24 cl, 12 dwg, 1 tbl

Description

The invention relates to electrical engineering mainly for measuring large-sized alternating current in a busbar package of a short network of furnace transformers for electric arc, including ore-thermal, electric steel, and also thermal (heating) furnaces.

There is a method of measuring large current in a short network of an electric arc furnace, in which a current transformer is installed on the bus, which serves as a current sensor, the terminals of which are connected to the measuring device / 1, 2 /. The disadvantage of this method of measuring current and the sensor is the limitation of the measured current flowing in the bus.

Known sensors for measuring large current in this way are measuring current transformers, which are produced in series for current in the bus from 10 to 25000 A / 3, 4 /. The disadvantages of this known method and current transformers are the limitation of the measured current in the bus package to 25,000 A, if necessary, to measure the current in the bus packages of the furnace transformers of arc furnaces, for example, ore-thermal ones, to 70,000 A. In addition, current transformers have a large mass (up to 170 kg ), dimensions and price - up to 100,000 rubles. In addition, the well-known high-power current transformer cannot be inserted into the bus package of a short network of a furnace transformer with a capacity of 16 MW and above.

A known method of measuring AC current of large magnitude, based on the use of splitters, consisting of several conductors passing through the transformer counter-parallel, forming the primary winding of the transformer and creating a resulting magnetic flux proportional to the difference in magnetic flux generated by currents flowing in the wires of the splitters. The terminals of the secondary winding of the transformer are connected to a device for measuring current / 5 /.

The first disadvantage of the known method / 5 / is that it is necessary to manufacture a tire with a detachable connection in it that increases electrical resistance. With a rigid splitter, it is very difficult to install a sensor, and with a flexible splitter, the measurement method is inoperative.

The second drawback is the need to have a closed ferromagnetic core of complex shape and large size when measuring currents of the order of several tens of thousands of amperes.

The third drawback is the appearance of a powerful electromagnetic field around the splitter, which causes Foucault currents in nearby objects made of ferromagnetic materials, leading to their heating, and, consequently, to loss of electricity.

There is also a method of measuring large currents in two electrically isolated flat parallel conductors (buses), electrically connected in parallel and having free space between them using a magnetically sensitive element (MEC), made in the form of a current transformer, with a secondary winding wound on an soft magnetic core covering one of the conductors, so that one side of the soft magnetic core is placed in the space between the conductors, and the magnetic flux in the core is partially compensated but due to the current in the second conductor / 6 /.

The disadvantage is that when a very large current flows in flat parallel conductors (buses), a measuring current transformer of a very large mass is required. The effect of magnetic flux compensation in the part of the core located between the conductors will be manifested, and in the part of the core located behind the conductors, the magnetic flux from unidirectional currents flowing in two adjacent conductors is added, and the compensation effect is absent, therefore, at high currents, the core will overheat . To implement this method, there are still no powerful measuring transformers.

A current sensor is known, which is used primarily for measuring high currents, in which a current divider is used for proportional parts, consisting of several conductors connected in parallel, one of which is equipped with a core with a secondary winding connected to the input of the measuring device, while two conductors are worn a second core of soft magnetic material, so that the magnetic flux induced in the second core by the fractions of the measured current flowing through the two mentioned conductors are directed counter and compensated / 7 /. With the proposed design of the sensor, the effective cross-section of the current conductor sharply decreases, which will lead either to an increase in the size of the bus with sensors or, if the busbars are reduced, to increased heating of the sensor and the need to introduce a cooling device into it, which increases the dimensions of the sensor and significantly increases its cost. In addition, the conductor (bus) must be detachable, which also leads to a rise in the cost of construction.

Also known is an invention related to a sensor and a system for measuring current in electrical conductors / 8 /. The sensor / 8, items 1-15 / (prototype of the sensor according to the invention) is made in the form of at least one Rogowski ring spiral, covering a conductor with a measured current. Each ring spiral can consist of several parts connected to each other. Parts of the ring helix can be wound around a ferromagnetic or non-magnetic core.

The disadvantage of such a sensor is that it requires coverage of one bus of the bus packet, which is difficult to perform on the bus of a short network packet with a small distance between the buses (up to 20 mm), therefore, such a sensor is inoperative in the bus packet when measuring the aforementioned current value (up to 70 kA).

The current measurement system / 8 pp. 16-23 / (prototype system) consists of a sensor having a shape covering a conductor with current; a line connecting the sensor to the measuring device, which is a transmitter of the signal; voltage measuring devices and current calculating devices connected to the voltage measuring device.

The disadvantage of the measurement system is that the useful signal from the sensor is removed as a voltage signal, while the emf induced in the line (interference) with a large current connecting the sensor to the voltage measuring device is comparable with the voltage of the useful signal. Such a system is inoperative when measuring high current.

The first objective of the invention is to provide a method for measuring large current in an even number of electrically isolated buses (EIS) of a bus package of a short furnace furnace transformer or in at least two EIS having free space between them with high accuracy of current measurement.

The second technical task is to create such a sensor for measuring a large current that could be placed in the free space between the ESH so that the electrical signal arising in it can be sent to a measuring device that is included in the package of measuring devices for control and protection systems.

The third technical task is to create a current measurement system that would allow the signal from the current sensor to be generated in the form of a voltage or current signal and measure it with a standard measuring device.

Closest to solving the first problem is a method of measuring current in a pair of buses using a current transformer / 6 /.

The first problem is solved by the proposed method for measuring a large current in a bus packet, consisting of any even number of ESHs located at some distance from each other so that between the mirror-located planes of the ESH there is a space in which at least one magnetically sensitive element (MCE) is placed, included in the design of the current sensor, interacting with the electromagnetic field generated by the current flowing in two adjacent EIS in opposite directions, the sensor is connected by a transmission device and the signal from the MChE with a measuring device.

To increase the signal removed from the sensor, the tires are placed at a distance between their mirrored surfaces, less than or equal to the width of the tire. The length of the tire in the tire bag is taken equal to or greater than the width of the tire. For convenience of fixing between the tires, the thickness of the MCE is taken equal to the nominal distance between the mirrored surfaces of the tires.

The MCE is installed only in odd spaces, since both the electromagnetic field strength and the emf that occurs (induced) in the MEC are maximum in them. Depending on the required power of the incoming signal in one odd space, you can install more than one MCE, connecting them mainly in parallel. To increase the voltage supplied to the measuring device, the MCE is installed in various odd spaces, connecting them mainly in series, and the total number of MEC included in the current sensor is determined by the following dependence on the number of bus pairs in the bus package:

where K is the total number of MCE installed in the odd spaces of the bus package;

q _i - the number of MCEs installed in the i-th odd space;

n is the number of tire pairs in the tire packet.

MCE can be connected in series and / or in parallel in various combinations, depending on the parameters of the signal received from the sensor necessary for the measuring system. But there are a number of preferred odd spaces in which the MCE is installed, as well as the preferred methods for connecting the MEC forming the sensor.

If the bus packet consists of an odd number of ESH pairs, then the MCE is installed in the average odd space of the packet, receiving a signal with a higher signal voltage than when installing one MCH in other odd spaces. If the bus packet consists of an even number of pairs of ESMs, then the maximum signal voltage is obtained from a sensor with one MCE installed in one of the extreme spaces, and to double the voltage of the MCE signal, it is installed in both extreme spaces and connected in series.

Distinctive features of the method are the placement of MCE in the space between two sections of tire of the bus package, along which the current flows in opposite directions, and with the number of pairs of tires in the bus package more than one MEC set only in odd spaces; EISs are set so that the distance between their mirrored surfaces does not exceed the width of the EISs and not less than the thickness of the MCE, and the length of the tire in the tire package is taken to be equal to or greater than the width of the tire. A distinctive feature of the method is also the number of MCE installed in the bus package, which is determined by the following dependence on the number of pairs of EIS in the bus package:

as well as serial or parallel connection of MCE in various combinations depending on the current in the tires and on the required signal power from the sensor to the measuring device. In preferred embodiments of the method, several MBEs installed in one odd space are connected in parallel, and in different odd spaces in series. An essential distinguishing feature is the choice of the MCE installation location: for an odd number of NES pairs in the bus package, it is preferable to put one MEC in the space in the middle of the bus package, and if it is even, in one of the extreme spaces of the bus package or both.

Closest to the proposed solution to the second and third problems is a sensor and a system for measuring current / 8 /.

The second technical problem is solved in the design of the sensor for measuring a large current in a bus package consisting of any even number of electrically isolated EIS, between which are arranged successively odd and even spaces, which has at least one MCE placed in an odd space between adjacent sections busbars with oppositely directed currents, consisting of one or more turns of electrically conductive material, placed in space so that the plane of the turns is approximately perpendicular us specularly disposed and tire planes approximately parallel to the current direction in the tire. MCE coils can be made of an electrically conductive material having a strength sufficient to form a rigid structure without using a core. Coils of MCE can be wound on a linear core made in the form of a plate of rectangular cross section made of a ferromagnetic or non-magnetic material. A core made of a ferromagnetic material can increase the current induced by an electromagnetic field in isolated coils of an electrically conductive material.

The proposed sensor is used in the construction of a system for measuring high current in a busbar package КС ПТ, assembled from an even number of isolated buses, between which there are alternating odd and even spaces with mirror-mounted bus planes. The system consists of a current sensor with magnetically sensitive elements (MEC), a measuring device, a signal transmission and conversion device connecting the sensor to the measuring device, while the MEC of the sensor are located in odd spaces between bus sections with oppositely directed currents and have at least one turn from an electrically conductive material, the plane of which is approximately perpendicular to the mirrored planes of the tires and parallel to the direction of the current in the tires, and the number of MCE is determined, One of the dependencies:

where K is the total number of MCE included in the sensor;

i is the number of odd space;

q _i - the number of MCEs installed in the i-th odd space;

n is the number of PES pairs in the bus packet.

In order to increase the emf induced in the MCE and the accuracy of current measurement, the distance between the mirrored surfaces of the tire sections does not exceed the width of the tire, and the ratio of the width of the core with turns to the width of the tire is less than or equal to 1.

Distinctive features of the sensor are listed below. The MCE has at least one coil of electrically conductive material placed in the space between two ESMs with a current oppositely directed into them so that the plane of the turns is approximately perpendicular to the mirrored ESI planes and approximately parallel to the direction of the current. Additional differences are that at least one turn of the MCE is wound on a linear core in the form of a plate of preferably rectangular cross section made of a ferromagnetic or non-magnetic material; the preferred ratio of the width of the core with the turns to the width of the EIS is less than or equal to 1, while the MCE are connected in series or in parallel. The measuring device has a device for matching the signal removed from the sensor with the characteristic of the input circuits of the measuring device.

Each MChE can be connected directly to the measuring device. The system may have a sensor that includes at least two MCE, located in an odd space and interconnected in parallel or in series. The system may have at least one sensor located in an odd middle space of the bus packet.

To convert a voltage signal into a current signal, the signal transmission and conversion device has an inductance or capacitance connected in series with the sensor.

The set of distinguishing features of a large current measurement system in a bus package is as follows: the MCE of the current sensor is located in odd spaces between the tires, each MEC has at least one coil of electrically conductive material, the plane of each coil is approximately perpendicular to the mirror planes of the bus and parallel to the direction of the current in opposite sections tires, in tires the amount of MCE is determined based on the dependence:

MCE are interconnected in series or in parallel, the measuring device has a device for matching the signal removed from the sensor with the characteristic of the input circuits of the measuring device. To increase the power of the signal taken from the sensor, the system can have at least two MChEs located in one odd space, connected to each other in parallel or in series. Of the several MCEs included in the system, each MEC can be connected to a measuring device. With a very large current in the bus package, it is sufficient to place at least one MCE in an odd average space or in one extreme space.

A distinctive feature of the measurement system is the presence in the device for transmitting and converting the inductance signal or capacitance, connected in series with the sensor and providing a phase shift of the sensor current signal by 90 el. hail., and as a result, the phase signal of the sensor and the measured current.

On figa shows a pair of tires with MEC installed in the space between the mirrored planes of the tires.

-образной формы с МЧЭ, установленным между противолежащими участками шины.On figv shows the tire

-shaped with MCE installed between opposite sections of the tire.

On figs shows a view of a bus and MCE in figa.

On fig.1d shows a diagram for calculating the parameters of the sensor.

On figa shows a sensor consisting of one MCE, wound on the core.

On figv - cross section bb of the tire and the sensor.

On figs - view C on the bus and the sensor.

Figure 3 shows a diagram of a system for measuring high currents, including a sensor consisting of several MCE with cores installed in pairs in the design spaces of the power supply connected in series and connected to the measuring device.

Figure 4 shows a diagram of a system for measuring high currents, including a sensor consisting of several MCHE installed in pairs in the design spaces of the silos connected in parallel.

Figure 5 shows a diagram of a system for measuring high currents, including a sensor located in the middle odd space of the NW, and a device for transmitting and converting a signal having a capacitor connected in series with the sensor.

Figure 6 shows a diagram of a system for measuring high currents, including a sensor with two MCH installed in the extreme spaces connected in series, and a device for transmitting and converting a signal, including a choke, connected in series with the sensor.

Figure 7 shows a diagram of a system having an MCE installed in the odd spaces of the silos, each of which is connected to a measuring device.

In accordance with the proposed method, MCE 1 is installed in the space between two sections of tires 3, with opposite currents (figa, b, c). Conclusions 4 MCE direct perpendicular to the planes of turns 5. Alternating magnetic fields that arise around sections of tires 3 with oppositely directed currents are summed in space 2 and, in accordance with the law of electromagnetic induction, cause the emergence of an emf. in turns of MCE.

For MCE, consisting of N turns of conductive material (wire), wound perpendicular to the plane of the bus and parallel to the measured current, the emf induced in the MEC is determined by the formula:

where N is the number of turns in the MCE;

i is the number of turns MCE;

f is the frequency of the corresponding harmonic of the measured current (for Russian conditions, the frequency of the fundamental harmonic is 50 Hz);

π is the number of pi;

Ф _i - component of the magnetic flux crossing the i-th turn of the MCE in the direction normal to the plane of the turn.

(фиг.1d):The component of the magnetic flux crossing the i-th turn of the MCE in the direction normal to the plane of the turn is determined by the formula (the formula is valid provided

(fig.1d):

where L is the length of the tire (section of the tire package in the place of installation of MCE);

l is the length of the MCE;

b is the thickness of the MCE;

δ is the tire thickness;

μ is the relative magnetic permeability of the core material;

μ ₀ is the magnetic constant;

H _i (x) is the normal (with respect to the plane of the MCE loop) component of the magnetic field at a point located on the plane of the ith coil of MCE with x coordinate along the X axis;

The magnetic field strength at an arbitrary point in the space surrounding the current conductor can be determined on the basis of the total current law:

Solving this equation for the tire configuration shown in Fig. 8, subject to neglecting the tire thickness, we obtain the following formula for determining Hi (x):

where I is the bus current;

B - tire width;

a - the distance between the vertical axes of the tires in the tire package;

y _i - coordinate of the i-th turn of the MCE along the Y axis.

Given the location of the MCE symmetrically along the Y axis relative to the edges of the tires, the coordinate of the i-th turn of the MCE along the Y axis is determined by the formula:

where d is the diameter of the wire of the coil MCE.

When using a measuring device with input circuits designed for a current signal, reactance in the form of inductance or capacitance is connected in series with the current sensor. The magnitude of the current signal supplied to the measuring device is determined by the formula:

where E _∂ - total emf sensor. With a sensor consisting of one MCE, the total emf the sensor is equal to the emf induced in the MCE;

R _∂ is the active resistance of the sensor;

X is the reactance of the signal transmission and conversion device.

The active resistance of the sensor depends on the resistances included in the MCE sensor, and on the MCE connection diagram. In the case of a sensor consisting of a single MCE, the active resistance of the sensor is equal to the active resistance of the MEC:

where ρ is the resistivity of the electrically conductive material of the MCE winding.

The reactance of the signal transmission and conversion device is calculated by the formulas:

For inductance, X = 2πfL, where L is the inductance.

For the capacitance X = 1 / 2πfC, where C is the capacitance.

The choice of inductance (capacitance) must be carried out based on the ratio X / R _∂ ≥10.

The MCE 1, installed between the tires 3, has one or more turns 5 of electrically conductive material (figa, b, c, 2a, b, c), the planes of which are approximately perpendicular to the mirrored surfaces 6 of the tires and approximately parallel to the direction of the current in the tires. The turns can be wound on a linear core 7 (figa, b, c), which is made of non-magnetic or ferromagnetic material. If it is necessary to increase the signal power with limited sizes of MCE, then the core is made of ferromagnetic material.

-образной петли, в параллельных участках которой ток противоположно направленный.In one embodiment of the method for measuring a large current (Fig. 1b), a space 2 is formed in the form between the mirrored surfaces 6 of the sections of one of the outer rails.

-shaped loop, in parallel sections of which the current is oppositely directed.

To exclude the influence of the edge effect on the distortion of the electromagnetic field, the ratio of the width “b” of the core 7 with the turns to the width B of the tire 3 is taken to be less than or equal to 1, and the length of the opposite sections of the bus is taken to be greater than or equal to the width of the tire (L≥B, figs).

A sensor for measuring a large current in a busbar package has at least one MCE 1 (Fig. 1a, b, c), consisting of several turns 5 of electrically conductive material, for example, copper, placed in space 2 so that the plane of the turns 5 is approximately perpendicular planes 6 tires 3 and parallel to the direction of current in the bus. To increase the rigidity of the MCE, the coils 5 are wound on a linear core 7 made in the form of a plate rectangular in cross section (Fig. 2a, b, c). To increase the emf that occurs in turns 5 of MCE 1 under the influence of magnetic fields induced in space 2 by a current flowing in opposite sections of tires 3, turns 5 of an insulated wire are wound onto a core 7 of ferromagnetic material. To exclude the influence of the edge effect on the magnitude of the emf that occurs in the MCE 1, the ratio of the width of the core 7 to the width of the opposite sections of the tire is taken to be less than or equal to unity.

A system for measuring a large current in a switchgear in one of the options consists of a sensor that includes four MCE installed in extreme odd spaces 2, two in each, interconnected in series (Fig. 3), if it is necessary to obtain a large value of emf from. on the sensor, or in parallel (figure 4), if you want to get a large amount of current in the circuit of the measuring system. The sensor 8 is connected to the measuring device 9 through the device 10 for transmitting and converting the signal from the sensor 8.

The device 10 may have an inductance 11 (FIGS. 4, 6) or a capacitance 12 connected in series with the sensor 8 and providing a phase shift of the sensor current signal by 90 el. hail., and as a result, the phase signal of the sensor and the measured current.

In the embodiment of the system (Fig. 7), the conclusions of each MCE are connected directly to the measuring device 9. In this case, the device 9 implements a computational algorithm that calculates the magnitude of the current in the busbar based on the emf. each MCE.

Example 1. The proposed method was used to measure a large current in the short circuit of the short circuit of the furnace transformer of a three-phase ore-thermal furnace, having the following technical characteristic:

Three-phase transformer, installed power 22 MVA, number of voltage steps 5, high-voltage side voltage (linear) 10 kV, low-voltage side voltage (linear) 162-197 V, high-voltage side current (main operating stage) 1100 A, low-side current voltage (main working stage) 67000 A. The short network is made according to the “triangle on electrodes” scheme. The busbar packages of the short network are made according to a bifilar scheme, each consisting of twelve aluminum tires with a section of 400 × 40 mm each. The distance between the tires is 15 mm.

In the extreme (first and eleventh) odd spaces of the silos, a sensor was installed, consisting of two identical MCEs, characterized by the following design parameters:

The linear dimensions of the MCE are 400 × 60 × 15 mm, the core is made of insulated plates of electrical steel, the winding consists of 270 turns of an insulated copper wire with a diameter of 1.2 mm. In series with the sensor, an 800 W DRL choke was turned on.

The choice of the geometric parameters of the MCE was made based on the materials available for the manufacture of the sensors and the design of the bus package. Estimated value of emf The MCE was 86 V for the current in the bus packet of 68,000 A. Measurements of the emf MCE installed in the extreme gap of the above-described bus package showed values of 75-95 V. The inductance (inductor) was selected based on the need to provide the current supplied to the measuring device within 3-7 A.

Due to the lack of bench equipment for testing the sensor with a current of up to 70 kA and the lack of the ability to measure current in a short network of the furnace transformer, the sensor was tested on an operating furnace using the following procedure:

1. We connected current sensors in a triangle (to form a signal corresponding to the current of the electrode) and connected to a digital measuring device designed for an input signal 0 ... 10 A of alternating current. The measuring device was connected to a computer for continuous (with a discrete time of 1 s) recording of signal values into a database.

2. Through another digital measuring device connected to the same computer, a continuous (with a discrete time of 1 s) recording of current and voltage signals to the database along the high side of the transformer was organized. In this case, signals were received from standard measuring current and voltage transformers.

3. Based on the database formed over 2 months, records were selected that corresponded to the furnace mode, as close as possible to the symmetry for the various voltage levels of the transformer.

4. Using the relation I _H = I _in k _mp ,

where I _n , I _in - respectively, the currents of the low and high voltage side of the furnace transformer;

k _mp is the transformation coefficient of the furnace transformer;

the electrode current was calculated for the selected modes.

5. Using the calculated currents of the electrodes and the available values of the signals from the sensors, the transmission coefficient of the current sensors was calculated.

6. Checked the independence of the transmission coefficient of the current sensors from the electric mode.

Table 1. The results of the calculation and measurement of current in the silos No. of rev. Current of the high voltage side of the furnace transformer, A Rated current of the low voltage side of the furnace transformer, A (k _mp = 60.7) The signal of the current sensor on the low voltage side of the furnace transformer, A Current sensor gain Phase 1 Phase 2 Phase 3 Phase 1 Phase 2 Phase 3 Phase 1 Phase 2 Phase 3 Phase 1 Phase 2 Phase 3 one 1071 1072 1084 65010 65070 65799 5.62 5.45 5.69 11565 11940 11561 2 1051 1047 1051 63796 63553 63796 5.57 5,4 5.61 11462 11771 11373 3 1049 1044 1044 63674 63371 63371 5.57 5.38 5,6 11423 11772 11326 four 1037 1035 1033 62946 62825 62703 5.53 5.36 5.56 11377 11717 11276 5 1055 1061 1068 64039 64403 64828 5.59 5,4 5.67 11463 11920 11443 6 1043 1038 1053 63310 63007 63917 5.54 5.35 5.63 11425 11768 11356 7 1067 1075 1062 64767 65253 64463 5.56 5,4 5.64 11456 11835 11390 8 1085 1082 1090 65860 65677 66163 5.62 5.45 5.63 11532 11969 11443 9 1049 1053 1058 63674 63917 64221 5.63 5.46 5.72 11689 12020 11562 The average deviation of the transfer coefficient of the current sensors 0.62% 0.79% 0.68%

Information sources:

1. RU No. 95112317 A1 07/18/1995.

2. US No. 4000361 12/28/1976.

3.http: //www.enestim.ru / info / album / trans T.htm

4.http: //www.cztt.ru/frame_p.html

5. RU No. 2223137 C2 05/06/2002.

6. WO 01/67117 A2 03/05/2001

7. RU No. 213882401 01/12/1998.

8. US No. 6680608 B2 02/27/2002.

Claims (18)

1. A method of measuring a large current in a busbar package (ШП), consisting of any number of electrically isolated buses (EIS), located at a distance from one another so that between the mirrored surfaces of the EIS there is an inter-tire space consisting in placement in the inter-tire space, according to at least one magnetosensitive element (MCE) interacting with an electromagnetic field generated by current flowing in the tires in opposite directions, and in connecting the terminals of the current sensor to the measuring device property, characterized in that the busbars are assembled from any even number of ESHs between which odd and even spaces are arranged sequentially, the MCEs are set in odd spaces, and their total number included in the current sensor is determined by the following dependence on the number of bus pairs in the busbar :

where K is the total number of MCE installed in the odd spaces of the silos; q _{i the} number of MCE installed in the i-th odd space; n is the number of tire pairs in the busbar. 2. The method according to claim 1, characterized in that the adjacent tires are placed at a distance between their mirrored surfaces, less than or equal to the width of the tire. 3. The method according to claim 1, characterized in that the tire length in the busbar is greater than or equal to the tire width. 4. The method according to claim 1, characterized in that at K≥2 MCE are interconnected sequentially or in parallel in various combinations. 5. The method according to claim 1, characterized in that the MCE installed in one odd space is connected in parallel. 6. The method according to claim 1, characterized in that the MCE installed in different odd spaces are connected in series. 7. The method according to claim 1, characterized in that the silos are assembled from an odd number of bus pairs, and one or more MCEs are installed in the middle space of the silos. 8. The method according to claim 1, characterized in that the silos are assembled from an even number of bus pairs and at least one MCE is placed in one of the outer spaces of the silos. 9. The method according to claim 1, characterized in that the silos are assembled from an even number of bus pairs, and the MCE is placed in the two extreme spaces of the silos. 10. The method according to claim 8 or 9, characterized in that the said extreme space is formed between the mirrored surfaces of the section of one tire, made in the form

shaped loops. 11. A sensor for measuring a large current in a power supply unit consisting of any even number of ESHs located at a certain distance from one another, between which odd and even spaces are arranged sequentially, consisting of at least one MCE placed in an odd busbar space having one or more turns of electrically conductive material, wound on the core so that the plane of the turns are perpendicular to the mirrored planes of the tires and parallel to the direction of the current in the tire, characterized in that the core is made of ferromagnetic material, and the ratio of the width of the core with turns to the width of the tire is less than 1. 12. A system for measuring high current in a short-circuit busbar of a furnace transformer short circuit assembled from an even number of electrically isolated buses, between which there are alternating odd and even busbars, consisting of a current sensor, a measuring device, a signal transmission and conversion device connecting the sensor to the measuring device characterized in that the current sensor consists of at least one MChE located in an odd inter-tire space having one or more turns of an electrical wire its material which is perpendicular to a plane mirror arranged parallel to the planes of the tire and the direction of current in the tire, the amount determined based on the MCHE depending

where K is the total number of MCE included in the sensor; q _i - the number of MCEs installed in the i-th odd space; n is the number of tire pairs in the bus, MCE are interconnected in series or in parallel, the measuring device has a device for matching the signal removed from the sensor with the characteristic of the input circuits of the measuring device. 13. The system according to item 12, excommunicated by the fact that it has at least two MChEs located in one odd space, interconnected in series. 14. The system according to p. 12, characterized in that it has at least two MChEs located in one odd space, interconnected in parallel. 15. The system according to p. 12, characterized in that it has at least one MCE located in the middle odd space or in one extreme space. 16. The system according to p. 12, characterized in that it has at least two MCH located in odd spaces, with each MCH connected to a measuring device. 17. The system according to p. 12, characterized in that the signal transmission and conversion device has an inductance connected in series with the sensor. 18. The system according to p. 18, characterized in that the signal transmission and conversion device has a capacitance connected in series with the sensor.

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