KR101986078B1 - Wiring method and apparatus of magnetic field energy harvesting considering voltage drop of power cable - Google Patents

Abstract

A wiring method for magnetic field energy harvesting according to the method present invention is to wire a plurality of current transformers (CTs) for energy harvesting using a magnetic field while comprising a core and coils wound around the core. The method comprises: an installation step of installing CTs on tracks of each phase in a three-phase power cable; and a connection step of connecting coils of each CT with any one wiring method. The wiring method comprises a delta (Δ) wiring method or a Y wiring method.

Description

Wiring method and apparatus of magnetic field energy harvesting considering voltage drop of power cable

The present invention relates to an energy harvesting connection method and apparatus, and more particularly, to an energy harvesting connection method and apparatus for improving output while using a magnetic field generated around a power line while minimizing a voltage drop in a power line. .

In a conventional CCTV (closed circuit television) system, a security camera or the like has an outdoor installation configuration, and thus, power supply is not easy due to its installation environment. In other words, for the operation of the outdoor installation configuration in CCTV systems, the battery had to be replaced periodically, and when commercial power was used, additional equipment for commercial power supply had to be installed.

In order to solve the problem of securing power in a place where there is a transmission line but there is no commercial line, an energy harvesting technique using a magnetic induction method (hereinafter referred to as “magnetic energy harvesting”) is proposed. It became.

1 illustrates a basic structure of a magnetic field energy harvesting device and a leakage magnetic field flow chart thereof, and FIG. 2 illustrates an example in which a magnetic field energy harvesting device is applied to a power line.

Referring to FIG. 1, a magnetic field energy harvesting apparatus includes a current transformer 10. In this case, the current transformer 10 is a device for obtaining a power source by a magnetic induction method, and includes a toroidal magnetic core 1 and a coil 2 wound around the core 1. . At this time, the core (1) is a power line; to generate the induced voltage (V _induce) across the collection of leakage magnetic field (leakage magnetic field), the coil (2) of the (power line PC). Accordingly, the current transformer 10 may provide power to an outdoor installation configuration such as a security camera SC as shown in FIG. 2.

In addition to CCTV systems, the magnetic field energy harvesting technology can be used for power supply of various systems such as power quality monitoring system, air collision prevention system and forest fire detection system.

However, when the current transformer 10 is installed in the power line PL, a voltage drop occurs in the power line PL. In particular, when the required voltage of the system is large, the number of the current transformers 10 installed in the power line PL is also increased, thereby increasing the voltage drop at the power line PL. When the voltage drop occurs in the power line PL, a problem may occur that may impede normal commercial power supply to a home or an industrial facility.

In order to solve the problems of the prior art as described above, the present invention reflects that the power line installed outdoors is mainly a three-phase power line, so that the magnetic field improves the output while minimizing the voltage drop in the power line even if the number of current transformers is increased. It is an object of the present invention to provide a method and apparatus for connecting energy harvesting.

However, the problem to be solved by the present invention is not limited to the above-mentioned problem, another task that is not mentioned will be clearly understood by those skilled in the art from the following description.

Magnetic field energy harvesting connection method according to an embodiment of the present invention for solving the above problems includes a core and a coil wound around the core, a plurality of current transformer (CT) for energy harvesting using a magnetic field; ), Comprising: (1) an installation step of installing a current transformer on a line of each phase in a three-phase power line, and (2) a connection step of connecting coils of each CT in any one connection method. Includes a delta (△) connection method or a wye (Y) connection method.

The connecting step may include selecting a wiring method according to a characteristic of a load connected to an output terminal.

The connecting step may include selecting a connection method of minimizing a voltage drop on a line side or selecting a connection method of which a final output characteristic of a current transformer is maximized.

The delta connection method or the wire connection method may include three output nodes, and the current of each output node may be rectified and summed and output to the output terminal.

In the delta connection method, each end of the first coil and the second coil may be connected to the A node, the other end of the first coil and one end of the third coil may be connected to the B node, and the second coil and the third coil Each other end of may be connected to a C node.

In the wire connection method, each end of the first coil to the third coil may be connected to each other, the other end of the first coil may be connected to the A node, the other end of the second coil may be connected to the B node, and the third The other end of the coil may be connected to the C node.

In the delta connection method or the wire connection method, a first rectifying device is provided between the first output terminal and the A node to the C node, respectively, one end of each rectifying device may be connected to the first output terminal, and the other end of each first rectifying device is The second rectifying device may be provided between the second output terminal and the A node to the C node, respectively, and the other end of each rectifying device may be connected to the second output terminal, and one end of each second rectifying device may be connected to each node. .

The connection method may further include a serial connection method, a parallel connection method or a mixed connection method thereof.

Magnetic field energy harvesting apparatus according to an embodiment of the present invention, (1) includes a core and a coil wound around the core, but the energy harvesting using a magnetic field, a plurality of phases installed on each phase line in a three-phase power line Current transformer (CT) of (2), (2) includes a connection for connecting the coils of each CT in any one connection method, the connection method includes a delta (△) connection method or a wire (Y) connection method.

The connection part may be selected in a wired manner.

Magnetic field energy harvesting connection method and apparatus according to the present invention configured as described above, unlike the conventional installation of a plurality of current transformers in one line, it is proposed to install a current transformer in each phase line of the three-phase power line, the number of current transformers In addition to increasing the output power while minimizing the voltage drop in the power line, the weight of the installed device can be distributed to the lines of each phase.

In addition, the magnetic field energy harvesting connection method and apparatus according to the present invention proposes a delta connection method or a wire connection method in which the rectifier element is smaller than other connection methods, and thus, there is an advantage in that power efficiency may be increased when these connection methods are employed.

In addition, since the connection method and apparatus for magnetic field energy harvesting according to the present invention can select various connection methods having different voltage drop and power size according to the characteristics of the load, there is an advantage of widening the choice of load that can be adopted. have.

1 shows the basic structure of a magnetic field energy harvesting device and its leakage magnetic field flow chart.
2 shows an example in which a magnetic field energy harvesting device is applied to a power line.
3 shows an equivalent circuit model when the current transformer 10 is installed on the power line PL.
4 shows various wiring schemes for the three current transformers 10.
5 shows a block diagram of an apparatus 100 for magnetic field energy harvesting in accordance with one embodiment of the present invention.
6 is a flowchart illustrating a method of connecting magnetic field energy harvesting according to an embodiment of the present invention.
7 is a conceptual diagram illustrating a wiring method of magnetic field energy harvesting according to an embodiment of the present invention.
8 shows a schematic configuration of a series connection system for three current transformers 10.
9 shows a detailed configuration of a series connection system for three current transformers 10.
10 shows a schematic configuration of the delta connection system for the three current transformers 10.
11 shows the detailed configuration of the delta connection system for the three current transformers 10.
12 shows a schematic configuration of the wire connection system for the three current transformers 10.
13 shows a detailed configuration of the wire connection method for the three current transformers 10.
FIG. 14 is a graph showing magnitudes of voltage drop and induced power in the power line PL by the delta connection method and the wye connection method according to the size of the load Z _L.

The above objects, means, and effects thereof will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, and as a result, those skilled in the art to which the present invention pertains may easily facilitate the technical idea of the present invention. It can be done. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular forms also include the plural forms as the case otherwise indicates. In this specification, terms such as "comprise", "include", "presume" or "have" do not exclude the presence or addition of one or more components other than the mentioned components.

In this specification, terms such as “or”, “at least one”, etc. may refer to one of the words listed together, or may represent a combination of two or more. For example, "or B" "and at least one of B" may include only one of A or B, and may include both A and B.

In this specification, descriptions that follow “for example”, etc., may not exactly match the information presented, such as the recited characteristics, variables, or values, tolerances, measurement errors, limits of measurement accuracy, and other commonly known factors. It should not be limited to the embodiments of the invention according to various embodiments of the present invention in the same effect as the modification.

In the present specification, when a component is described as being 'connected' or 'connected' to another component, the component may be directly connected to or connected to the other component, but another component may be present in between. It should be understood that it may. On the other hand, when a component is said to be 'directly connected' or 'directly connected' to another component, it should be understood that there is no other component in between.

In the present specification, when a component is described as being 'on' or 'facing' another component, the component may be directly in contact with or connected to another component, but another component may be present in between. It should be understood that it can. On the other hand, if a component is said to be 'directly' or 'directly' to another component, it may be understood that there is no other component in between. Other expressions describing the relationship between the components, such as 'between' and 'directly between', may be interpreted as well.

In this specification, terms such as 'first' and 'second' may be used to describe various components, but the components should not be limited by the above terms. In addition, the above terms should not be construed as limiting the order of each component, but may be used for the purpose of distinguishing one component from another. For example, a 'first component' may be referred to as a 'second component', and similarly, the 'second component' may also be referred to as a 'first component'.

Unless otherwise defined, all terms used in the present specification may be used in a sense that can be commonly understood by those skilled in the art. In addition, terms that are defined in a commonly used dictionary are not ideally or excessively interpreted unless they are specifically defined clearly.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 shows an equivalent circuit model when the current transformer 10 is installed on the power line PL.

A current transformer 10 generates an induced voltage (V _induce) to the coil (2) by using jagijangreul generated by the current (I _p) flowing through the power line (PL) in accordance with Faraday's Law (Faraday's law), the induced current (I _C ) and equivalent circuit model is analyzed as follows.

First, the power line equivalent impedance Zp by I _p is as follows.

In addition, the impedance Zc of the current transformer 10 by I _c is as follows.

In addition, the mutual inductance by I _p and I _c is as follows.

On the other hand, each element in the equivalent circuit model can be expressed as follows.

From here,

According to the above equations, the impedance change of the power line PL by the current transformer 10 is as follows.

Finally, the voltage drop of the power line PL due to the impedance change is as follows.

That is, if a current transformer (10) provided on the power line (PL), the current transformer 10 may affect the reaction in the induced voltage (V _induce) a power line (PL) as well as to generate a coil (2), whereby As a result, a voltage drop occurs in the power line PL.

4 shows various wiring schemes for the three current transformers 10.

Conventional magnetic field energy harvesting devices are designed for a limited amount of line current. However, in the actual transmission / distribution environment, a large current flows and changes instantaneously, and thus the output performance of the magnetic energy harvesting device changes significantly. In particular, as the magnitude of the current flowing in the line increases, the magnitude of the induced voltage becomes large, and the output of the current is relatively low, and thus the output is low.

Accordingly, the conventional magnetic field energy harvesting apparatus increases the output by installing a plurality of current transformers 10 on one power line PL. That is, the conventional magnetic field energy harvesting apparatus, as shown in Figure 4, a series connection method (see Fig. 4 (a)), a parallel connection method (see Fig. 4 (b)), a parallel / parallel mixed connection method ( 4 (c)), each current transformer 10 was connected to adjust the final output voltage range.

However, in the conventional magnetic field energy harvesting device, since a plurality of current transformers 10 are installed on one power line PL, the voltage drop in the corresponding power line PL is further increased, and the final output is also reduced. Done. In addition, the weight of the device portion installed in one power line PL is also increased.

On the other hand, the power line PL installed outdoors is mostly a three-phase power line (PL) having a three-phase line. Accordingly, the present invention provides a magnetic field energy harvesting connection method and apparatus reflecting the fact that the power line PL installed outdoors is mainly a three-phase power line PL. That is, in the connection method and apparatus according to the present invention, since the current transformers 10 are installed on each of the three phase lines, they are connected, thereby reducing the voltage drop in the power line PL and improving the final power. There is an advantage that the weight of the device to be installed can be distributed to the track of each phase.

5 shows a block diagram of an apparatus 100 for magnetic field energy harvesting in accordance with one embodiment of the present invention.

First, the apparatus 100 for magnetic field energy harvesting according to an embodiment of the present invention is a device for supplying power, and as shown in FIG. 5, includes a current transformer 10 and a connection portion 20.

The apparatus 100 for magnetic field energy harvesting according to an embodiment of the present invention may generate power in a contactless form without external power supply. That is, the apparatus 100 for magnetic field energy harvesting according to an embodiment of the present invention may generate a current by utilizing induced electromotive force generated from a current flowing in the power line PL. In addition, the device 100 of the magnetic field energy harvesting according to an embodiment of the present invention is designed to be detachable from the power line PL when necessary, so that the device 100 may be detachable regardless of the state of the power line PL.

Current transformer 10 is a configuration for energy harvesting using a magnetic field according to the magnetic induction method. In this case, the current transformer 10 may include a magnetic core 1 shown in FIG. 1 and a coil 2 wound around the core. In particular, a plurality of current transformers 10 may be installed, and at least one current transformer 10 may be installed on a line of each phase in the three-phase power line PL. Hereinafter, the current transformer 10 installed on the n-th line of the three-phase power line PL (where n is a natural number of 3 or less) is referred to as an “n-th current transformer”, and the core 1 and the coil 2 of the n-th current transformer are referred to as “n-th current transformers”. ) Are referred to as "n-th core" and "n-th coil", respectively. That is, at least one n-th current transformer may be provided in the n-th line.

Specifically, when a large current flows in each line, a magnetic field is generated around each line by the right hand law of the ampere's law, and each current transformer 10 is induced in accordance with the magnetic field generated by the Faraday's law. By generating electromotive force, a power source is generated. That is, each current transformer 10 generates a current proportional to the current of the corresponding line.

The current transformer 10 may convert a line voltage of a high voltage and a high current into a low voltage and a low current according to the number of turns of the coil 2. At this time, the current transformer 10 is a ring (ring) type to be detachable / attached to each line, it can be manufactured in a clamp (clamp) structure.

For example, the current transformer 10 includes a tower assembly having a core and a coil installed therein, a bottom assembly corresponding to the tower assembly, a hinge to which the top assembly and the bottom assembly are pivotally coupled to each other, and a top assembly and a bottom assembly. Each of the lock clips to selectively open and close may be included. At this time, the core 1 and the coil 2 are included in each assembly to generate an electromotive force.

According to such a structure, since the current transformer 10 is manufactured as a detachable detachable type, it may be convenient when the current transformer 10 needs to be additionally added to each line or vice versa. In addition, by using such a removable current transformer 10 by controlling the magnetization of the core (1) when the line current flows in order to prevent from the risk of theft, by separately managing the removable portion of the core (1), It is not possible to detach the system arbitrarily. That is, the separation device for separating the current transformer 10 is provided separately can be controlled to prevent the detachable.

That is, the current transformer 10 is basically a structure of an electromagnet when current flows in the line, so once it is attached to the line, it is almost impossible to detach or detach by physical force. If the current transformer is not electrically controlled for magnetization control, In the event of a power outage or emergency, the core cannot be removed except in the event of a power outage on the line.

In addition, the current transformer 10 may include a power converter. At this time, the power converter converts the AC power generated by the current transformer 10 to a DC power. That is, the power converter may receive the secondary current which is induced by the electromagnetic induction of the current transformer and output the converted current to a DC voltage having a desired magnitude.

The connection part 20 is a structure which connects the coil 2 of each current transformer 10 by one connection method. In this case, the connection unit 20 may include a plurality of wires and a rectifying element (for example, a diode). That is, the wire may form two output terminals by connecting the coil 2 and the rectifier element according to the connection method of the current transformer 10, and each output terminal may be connected to one end and the other end of the load (Z _L ).

In addition to the one of the connection methods (serial connection method, parallel connection method, serial / parallel mixed connection method) shown in FIG. 4 (hereinafter, referred to as a “normal connection method”), the connection method of the connection part 20 is delta ( (Triangle | delta)) connection system, or W (Y) connection system can be included. In this case, the connection unit 20 may include a switching unit to select or change any one of the connection methods. That is, the switching unit may select any one of a general connection method, a delta connection method, and a wire connection method, and may change to another connection method even after selecting one connection method. However, the selection or modification may be mechanical or electronic, but is not limited thereto.

6 is a flowchart illustrating a method of connecting magnetic field energy harvesting according to an embodiment of the present invention, and FIG. 7 is a conceptual diagram of a method of connecting magnetic field energy harvesting according to an embodiment of the present invention.

On the other hand, the connection method of the magnetic field energy harvesting according to an embodiment of the present invention, as shown in Figure 6, includes S10 and S20, may be employed in the magnetic field energy harvesting device 100.

S10 is an installation step, as shown in FIG. 7, to install the magnetic field energy harvesting device 100. Specifically, in S10, at least one current transformer 10 is installed on the line of each phase in the three-phase power line PL.

S20 is a connection step, in which the coils 2 of the current transformers 10 are connected in any one connection method, that is, the connection method of the connection unit 20 is selected.

In detail, as illustrated in FIG. 7, in S20, an optimal connection method may be selected while analyzing two regions of the three-phase power line PL with power analyzers PA1 and PA2. That is, the power of the first region corresponding to the current of the current transformer 10 installed in the three-phase power line PL and the second region corresponding to the current of the current transformer 10 installed after the analysis may be analyzed. At this time, there are two output stages according to the wiring method of each current transformer 10, and each output stage is connected to a load Z _{L that} receives power from the magnetic field energy harvesting apparatus 100. Accordingly, while the load Z _L is connected to each output terminal, the power supply of each region can be analyzed while changing the wiring method of each current transformer 10. In this case, the voltage of the second region is lower than that of the first region. Accordingly, in S20, a wiring method in which the voltage drop in the second region is minimal compared to the first region can be selected.

In addition, in order to select an optimal connection method, a power analyzer (not shown, PA3) is installed in a third region between the load Z _L and the output terminal of the magnetic field energy harvesting device 100 so that the magnetic field energy harvesting device 100 may be installed. You can analyze the output of. That is, while the load Z _L is connected to each output terminal, the output power of the magnetic field energy harvesting device 100 may be analyzed while changing the connection method of each current transformer 10. Accordingly, in S20, a connection method may be selected when the power in the third region corresponds to the power corresponding to the required power of the load Z _L.

That is, in S20, the power quality change and the output characteristics of the magnetic field energy harvesting device 10 on the line side according to the load Z _L may be simultaneously checked while changing the wiring method. Accordingly, in S20, the connection method in which the voltage drop on the line side is minimized or the connection method in which the output characteristic of the magnetic field energy harvesting device 10 is maximum according to the load Z _L may be selected.

That is, in S20, one of the general connection method, the delta connection method, and the wire connection method may be selected according to the characteristics of the load connected to the output terminal. Each wiring method forms two output stages for output, so each output stage can be connected to the load Z _L. In this case, the voltage drop may vary in each connection method according to the characteristics of the load Z _L. That is, the optimum wiring method may vary depending on the characteristics of the load Z _L.

8 shows a schematic configuration of a series connection system for three current transformers 10, and FIG. 9 shows a detailed configuration of a series connection system for three current transformers 10. As shown in FIG.

Since the first to third current transformers generate induction power from the lines of different phases, each power generated in the first to third current transformers may have a different phase, that is, a phase difference of 120 °. Accordingly, when these power supplies are added in alternating current form, the sum of the power supplies becomes zero. To solve this problem, the connection unit 20 converts the induction power supply by the current transformers of each phase into a direct current form through a rectifier circuit to further add power. It is configured to. This can also be applied to other wiring methods.

However, in the case of such a series connection method, as shown in FIG. 9, since four rectifier elements are to be connected to one current transformer 10, at least 12 rectifier elements are required. In addition, the series connection method requires at least one capacitor to be connected to one current transformer 10, and therefore requires at least three capacitors. Although not shown, the same applies to the parallel connection method and the parallel / parallel mixed connection method. That is, in the case of the general connection method, the power output is deteriorated due to the large number of rectifiers, so that the final output may be reduced, and the volume may be increased due to the large number of capacitors.

10 and 12 show a schematic configuration of the delta connection method and the wire connection method for the three current transformers 10, and FIGS. 11 and 13 show the details of the delta connection method and the wire connection method for the three current transformers 10. The configuration is shown.

The delta connection method or the wire connection method includes three output nodes (hereinafter, referred to as “A node”, “B node”, and “C node”) as shown in FIGS. 10 to 13. In this case, the delta connection method or the wire connection method is connected so that the current of each output node is rectified and then summed and output to the output terminal.

10 and 11, in the delta connection method, one end of each of the first coil and the second coil may be connected to the A node, and the other end of the first coil and one end of the third coil may be connected to the B node. Each other end of the second coil and the third coil may be connected to the C node.

In this case, the delta connection method may be configured such that the currents of the node A to the node C are rectified and then summed and output to the output terminal. That is, referring to FIG. 11, rectifying elements D1 to D3 are respectively provided between the first output terminal O1 and nodes A to C, and one end of each of the rectifying elements D1 to D3 is connected to the first output terminal ( O1), and the other end of each of the rectifying elements D1 to D3 may be connected to each node (A node to C node). In addition, different rectifying elements D4 to D6 may be provided between the second output terminal O2 and the A node to the C node, and the other end of each of the rectifying elements D4 to D6 may be connected to the second output terminal O2. In addition, one end of each rectifying element D4 to D6 may be connected to each node (A node to C node). In addition, a capacitor may be connected between the first output terminal and the second output terminal, and a final output voltage may be applied to the capacitor.

12 and 13, in the wire connection method, one end of each of the first coil to the third coil may be connected to each other and connected to an N node, and the other end of the first coil may be connected to an A node, and the second coil may be connected to each other. The other end of may be connected to a B node, and the other end of the third coil may be connected to a C node. In addition, a capacitor may be connected between the first output terminal and the second output terminal.

In this case, the wire connection method may be configured such that the respective currents of the node A to the node C are rectified and summed and output to the output terminal. That is, referring to FIG. 13, rectifying elements D1 to D3 are respectively provided between the first output terminal O1 and nodes A to C, and one end of each of the rectifying elements D1 to D3 is connected to the first output terminal ( O1), and the other end of each of the rectifying elements D1 to D3 may be connected to each node (A node to C node). In addition, different rectifying elements D4 to D6 may be provided between the second output terminal O2 and the A node to the C node, and the other end of each of the rectifying elements D4 to D6 may be connected to the second output terminal O2. In addition, one end of each rectifying element D4 to D6 may be connected to each node (A node to C node). Also, the N node can be connected to ground. In addition, a capacitor may be connected between the first output terminal and the second output terminal, and a final output voltage may be applied to the capacitor.

In the connection method of the present invention, since the current transformer 10 is installed in each of three-phase lines, the voltage drop in the power line PL can be reduced compared to the conventional installation of a plurality of current transformers 10 in one line. In particular, the delta connection method or the wire connection method requires at least six rectifier elements because two rectifier elements must be connected to nodes A to C, respectively.

Accordingly, the delta connection method or the wire connection method has fewer rectifier elements (1/2 of the general connection method) than the general connection method, thereby increasing power efficiency. That is, the delta connection method or the wire connection method can induce a current 1.7 times higher than using one line. In addition, the delta connection method or the wire connection method may be used by transforming an AC power source into a DC source through a three-phase rectifier circuit and bringing a wide range of loads. In addition, the delta connection method or the wire connection method has a smaller number of capacitors (1/3 of the general connection method) than the general connection method, thereby greatly reducing the volume of the device.

On the other hand, delta wiring and Y wiring is easily through the T-PI conversion can be expressed equivalently, and selected for the load a form suitable for loading the size of the (Z _L) with the relative conversion (Z _L) .

FIG. 14 is a graph showing magnitudes of voltage drop and induced power in the power line PL by the delta connection method and the wye connection method according to the size of the load Z _L.

Referring to FIG. 14, in the delta connection method and the wire connection method, the magnitude of the voltage drop and the induced power varies according to the magnitude of the load Z _L. In particular, in a load Z _L having a first size (for example, 75 Ohm) or less, the delta connection method has a larger voltage drop and induced power than the wire connection method. In addition, in the load Z _L having a second size (eg, 90 Ohm) or more, the wire connection method has a larger voltage drop and induced power than the delta connection method. As described above, since the magnitude of the voltage drop and the induced power vary according to the characteristics of the load Z _L , in S20, an optimal connection method according to the characteristics of the load Z _L connected to the output terminal of the magnetic field energy harvesting device 100. That is, it is possible to select a wiring method in which the voltage drop is minimum or the induced power is maximum.

In the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the following claims and their equivalents.

1: core 2: coil
10: current transformer 20: connection
100: magnetic field energy harvesting device
PA: Power Analyzer PL: Power Line
SC: Security Camera Z _L : Load

Claims (10)

A method of connecting a plurality of current transformers (CTs) including a core and coils wound around the cores, and energy harvesting using a magnetic field,
An installation step of installing a current transformer on each phase line in the three phase power line; And
The coil of each CT is connected by either connection method, and the connection method is selected according to the characteristics of the load connected to the output terminal, but the connection method is selected in which the voltage drop on the line side is minimized or the final output characteristic of the current transformer is maximized. A connection step of selecting a connection method;
The connection method is a magnetic field energy harvesting connection method characterized in that it comprises a delta (△) connection method or a Y (Y) connection method. delete delete The method of claim 1,
The delta connection method or the wire connection method includes three output nodes,
The magnetic field energy harvesting connection method, characterized in that the current of each output node is rectified and summed and output to the output stage. The method of claim 1,
The delta connection method,
Each end of the first coil and the second coil is connected to the A node, the other end of the first coil and one end of the third coil is connected to the B node, and each other end of the second coil and the third coil is connected to the C node. Magnetic field energy harvesting connection method characterized in that the. The method of claim 1,
The wire connection method,
Each end of the first coil to the third coil is connected to each other, the other end of the first coil is connected to the node A, the other end of the second coil is connected to the B node, the other end of the third coil is connected to the C node Magnetic field energy harvesting connection method, characterized in that. The method according to claim 5 or 6,
The delta connection method or the wire connection method,
Rectifiers are respectively provided between the first output terminal and the A node to the C node, one end of each rectifying device is connected to the first output terminal, and the other end of each rectifying device is connected to each node,
A rectifying device is provided between the second output terminal and the A node to the C node, respectively, wherein the other end of each rectifying device is connected to the second output terminal, and one end of each rectifying device is connected to each node. The method of claim 1,
The connection method further comprises a series connection method, a parallel connection method or a mixed connection method thereof. A plurality of current transformers (CT) including a core and coils wound around the core, the energy harvesting using a magnetic field, and installed on a line of each phase in a three-phase power line; And
The coil of each CT is connected by either connection method, and the connection method can be selected according to the characteristics of the load connected to the output terminal, but it is possible to select the connection method with the minimum voltage drop on the line side or the final output characteristics of the current transformer. It includes; connecting portion that can be selected of the maximum wiring method,
The connection method is a magnetic field energy harvesting device, characterized in that it comprises a delta (△) connection method or a Y (Y) connection method. delete

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