KR101939569B1 - Rogowski coil current sensor with screened shield - Google Patents

Abstract

The present invention relates to a current sensor. More specifically, the present invention relates to a Rogowski coil current sensor with a shielding structure for measuring a low current and minimizing an effect of electromagnetic noise. According to an embodiment of the present invention, the Rogowski coil current sensor with a shielding structure is capable of forming a relatively large number of coils compared to PCB coils at an air core by using a Rogowski coil section of a bar type, measuring the low current of a low figure at the same time and increasing an effect of electromagnetic shielding at low costs by selecting a shield of a Faraday cage structure. The Rogowski coil current sensor comprises: a first substrate on which the Rogowski coil section of the bar type and circuit elements are mounted; and a second substrate formed in a structure to cover the Rogowski coil section of the bar type and circuit elements.

Description

ROGOWSKI COIL CURRENT SENSOR WITH SCREENED SHIELD < RTI ID = 0.0 >

The present invention relates to a current sensor, and more particularly, to a Rogowski coil current sensor having a shielding structure capable of measuring a low current and minimizing the influence of electromagnetic noise.

As power consumption has surged and power consumption has increased in recent years, accurate current measurement has become an indispensable element in terms of protecting power systems and maximizing power use efficiency. From the aspect of the customer, it is possible to predict and analyze power demand through accurate current measurement. In the aspect of power system, in addition to the rated current, it is possible to detect fault current through accurate measurement of fault and fault current, By separating, the power system can be protected.

Current sensors that are currently used include current transformers, shunts, hall sensors, Rogowski sensors, and the like. Currents in the form of current transformers (CT) Sensor is the most used.

However, because of the error caused by the magnetic saturation of the iron core, the current range that can be measured within a certain error range by a single current transformer is extremely limited, and fault currents ranging from several tens to several hundred times of the rated current It is almost impossible to detect it accurately. In addition, current power equipment often uses a power source having a frequency range of several tens of KHz due to development of power electronics and pulse power technology, but the current transformer has a limitation in measuring frequency currents other than the commercial frequency current.

Due to these problems, current sensors using Rogowski coils are being studied in foreign countries, and most of the products are connected to communication devices for systemization of current display devices and power systems.

1 is a schematic diagram illustrating the principle of measuring current in a conventional Rogowski current sensor. Referring to FIG. 1, a conventional Rogowski current sensor has a structure in which a power medium 1 for measuring a current passes through a Rogowski coil 3 wound uniformly along a circular core 2 made of a non-magnetic material And integrates the output voltage E induced by the current passing through the power medium 1 through an integrating circuit and amplifies it to calculate a current value flowing through the power medium 1. [ The main goal of the Rogowski current sensor is to minimize the error range of the current measurement. For this purpose, blocking the influence of the noise caused by the external electromagnetic field during the operation of the Rogowski current sensor is a very important performance evaluation factor.

In order to achieve this object, a structure in which the structure of the Rogowski coil or the current sensor is variously changed has been conventionally proposed. For example, in Japanese Patent Application No. 10-1466453 (current sensing device and method), a plurality of segmented winding elements are provided, and the leading one of the segmented winding elements is connected to the back of the segmented winding element To the substrate. In addition, Japanese Patent Application Laid-Open No. 10-2016-0107192 (high-bandwidth Rogowski transducer with shielding coil) has an external screen for by-passing the disturbance current to the ground plane, and a return conductor Lt; RTI ID = 0.0 > inner < / RTI > However, such a segmented structure or a double screen structure may improve the effect of blocking electromagnetic noise, but the structure for noise blocking is complicated and the manufacturing cost is increased.

In addition, Japanese Patent Application Laid-Open No. 10-1169301 (current sensor using Rogowski coil) discloses a structure in which a PCB is divided into an inner and an outer region to double-wrap the Rogowski coil, and Patent Document 10-1565014 There has been disclosed a Rogowski coil current sensor in which a shielding property of noise applied on the side of a PCB using a copper foil plating is greatly improved through the use of copper foil plating (a Rogowski coil current sensor having excellent noise shielding property and a manufacturing method thereof). However, when the Rogowski coil is patterned on a PCB (Printed Circuit Board), the number of windings of the Rogowski coil is limited by the PCB structure, so that it is difficult to measure the low current.

In addition, European Patent Publication No. EP 02560013 (Rogowski coil assemblies and methods for providing the same), European Patent Publication No. EP 01302773 (Screening device for Rogowski current measuring apparatus), US Published Patent Application No. 20080048646 PRECISION, TEMPERATURE-COMPENSATED, SHIELDED CURRENT MEASUREMENT DEVICE). However, in case of adopting PCB structure, it is difficult to measure the low current due to limitation of the rollers, and adopting circular Rogowski coil , The structure for shielding electromagnetic waves is complicated, which results in a problem that the manufacturing cost sharply increases.

Patent Registration No. 10-1169301 (Jul. 30, 2012) Patent Registration No. 10-1466453 (Nov. 21, 2014) Registration No. 10-1565014 (2015.11.06) Japanese Patent Application Laid-Open No. 10-2016-0107192 (2016.09.13) European Patent Publication No. EP 02560013 (Feb. 20, 2013) European Patent Registration No. EP 01302773 (Apr. 25, 2007) U.S. Published Patent Application No. 20080048646 (Feb. 28, 2008)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a current sensor that can be implemented at a low cost by adopting a shield structure capable of effectively shielding electromagnetic waves while using a rod- have.

In order to achieve the above object, a Rogowski coil current sensor according to the present invention comprises a first substrate on which a rod-shaped Rogowski coil segment and circuit elements are mounted, a rod- And a second substrate formed of a structure covering the circuit elements, wherein the first substrate includes a first shield and a first shield that are spaced apart from the first PCB area and the first PCB area by a certain distance to surround side and back surfaces, And the second substrate is spaced apart from the second PCB area and the second PCB area by a predetermined distance, and the side surface of the second PCB is separated from the second PCB area by a predetermined distance, And a second hole having a structure corresponding to the first through-hole.

The first PCB region may include a circuit element portion to which the circuit elements are coupled, a ground impedance matching portion connected to the circuit element portion, and the rod-type Rogowski coil segment.

The circuit element portion may be disposed adjacent to an outer side of the first shield.

The rod-type Rogowski coil segment may be a wound-type inductor in which a coil is wound around the core.

The eccentric core may further include a core having a high magnetic permeability therein.

The first through-hole may be formed in a rectangular, polygonal, or circular structure through which a current-carrying conductor can pass.

Wherein the second substrate has a size corresponding to a length and a length of the first substrate such that when the inner surface of the second substrate and the inner surface of the first substrate overlap to each other, Mechanical or electrical coupling.

The second PCB region may include a circuit element portion in the first PCB region, a ground impedance matching portion, and a housing region having a stepped portion having a predetermined thickness to cover the rod-shaped Rogowski coil segment.

The first through-hole and the second through-hole may have a structure in which the lower end is opened.

The first through-hole and the second through-hole may have a structure in which a lower end portion can be opened and closed.

The first through-hole and the second through-hole may have a terminal-type conductor through which a current can flow in one side of the first through-hole and the second through-hole.

A plurality of the rod-shaped Rogowski coil segments may be disposed.

The first shield and the second shield are formed of a conductive material and may have a Faraday cage structure in which a plurality of grooves are formed in a lattice pattern on the back surface.

The surfaces of the first shield and the second shield may include copper or tin plating.

A spaced space may be formed between the first PCB area and the first shield and a spaced distance may be formed between the second PCB area and the second shield.

The Rogowski coil current sensor may further include a display unit for displaying the measured current value so that the measured current value can be recognized from outside.

The Rogowsky coil current sensor may further include a cutoff unit that cuts off a current flowing in the conductors located in the first through holes and the second through holes when the measured current value exceeds a reference value.

The Rogowski coil current sensor may further include an internal power supply for supplying power.

The Rogowski coil current sensor may further include a power calculation unit connected to the built-in voltage sensor or an external voltage sensor to calculate power.

The Rogowsky coil current sensor may further include a communication unit capable of transmitting the measured current value to another electronic device using wired or wireless communication.

The Rogowski coil current sensor is configured to detect the shape and position of the rod-shaped Rogowski coil segment 116, the shape of the conductor located in the first and second apertures, the value of the current flowing through the conductor, And may further include a passive filter or an active filter for adjusting an element due to the frequency.

The Rogowski coil current sensor may be configured such that a plurality of the first and second substrates are coupled to each other in a horizontal or vertical direction so that a current can be simultaneously measured for the conductors when there are a plurality of conductors to measure a current .

According to the Rogowski coil current sensor according to the embodiment of the present invention, by using a rod-type Rogowski coil segment, it is possible to form a relatively large number of windings on an air core as compared with a PCB coil, At the same time, by adopting the shield of the Faraday cage structure, the effect of shielding the electromagnetic wave can be improved at low cost.

In particular, it is possible to obtain excellent shielding performance in comparison with a conventional Rogowski coil sensor using a circular coil, and it is possible to obtain a relatively large number of windings in comparison with a conventional Rogowski coil sensor using a PCB pattern, There is an advantage that it is possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically illustrates the principle of measuring current in a conventional Rogowski current sensor,
FIG. 2 is a block diagram illustrating component parts of a Rogowski coil current sensor according to an embodiment of the present invention. FIG.
3 is a diagram illustrating the placement of a rod-type Rogowski coil segment in a Rogowski coil current sensor according to an embodiment of the present invention;
4 is a fragmentary perspective view of a Rogowski coil current sensor according to an embodiment of the present invention,
5 is a rear exploded perspective view of a Rogowski coil current sensor according to an embodiment of the present invention,
FIG. 6 is a view showing a state in which parts of the Rogowski coil current sensor according to the embodiment of the present invention are spaced apart from the outer shield and the circuit surface,
7 is a circuit diagram of a ground impedance matching unit in a Rogowski coil current sensor according to an embodiment of the present invention,
FIG. 8 is a perspective view of a Rogowski coil current sensor according to an embodiment of the present invention, in which a first substrate and a second substrate are combined. FIG.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

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

FIG. 2 is a block diagram showing parts of a Rogowski coil current sensor according to an embodiment of the present invention. FIG.

Referring to FIG. 2, the Rogowski coil current sensor of the present invention includes a first substrate 100 on which a rod-type Rogowski coil segment and circuit elements are mounted, a rod-type Rogowski coil segment and a circuit element And the second substrate 200 formed thereon.

The first PCB 100 includes a first PCB 120 and a first PCB 120. The first PCB 120 is spaced apart from the first PCB 110 by a predetermined distance.

The first PCB region 110 includes a circuit element portion 112 to which circuit elements are coupled, a ground impedance matching portion 114, a rod-type Rogowski coil segment 116, and a conductor The first through hole 118 can be made of a material that can be formed.

Although the circuit element portion 112, the ground impedance matching portion 114 and the rod-type Rogowski coil segment 116 are described above, the ground impedance matching portion 114 and the rod- Since the slice 116 may correspond to a circuit element, the slice 116 may be represented by the circuit element portion 112 including all of them.

The circuit element portion 112 is a portion to which various circuit elements used for current measurement are coupled in the first PCB region 110. A variety of circuit elements such as integrated chips (ICs), capacitors, inductors, or resistors can be combined. The rod-type Rogowski coil segment 116 corresponds to a component for directly sensing a magnetic field caused by a current flowing in a conductor. However, the circuit element portion 112 excluding the Rogowski coil segment 116 uses a sensed magnetic field, It may be arranged so as to be positioned outside the first substrate 100.

The ground impedance matching unit 114 is provided to prevent signal attenuation of the first PCB area 110. Since the shielding structure of the first shield 120 can attenuate the signal, It serves to prevent signal attenuation.

The rod-type Rogowski coil segment 116 is used as a wound-in-line inductor in which a coil is wound around an air core. In the current sensor of the present invention, since the inductor coil is not constituted by a PCB structure but a wire-type structure in which a coil is wound around a rod-type core is adopted, a relatively large number of windings are formed in the core core And as a result, low current measurements of low values are possible. At this time, the eccentric core may improve the sensitivity of the current measurement by inserting a core having high permeability into the eccentric core.

The first through hole 118 may be formed in a polygonal structure such as a quadrangle or a circular structure so that a conductor through which current flows can be passed. The conductor may be passed through the center of the first through hole 118 for accurate current measurement, but the conductor may be passed close to one side in the first through hole 118. [ That is, in the case of the conventional circular Rogowski coil, it is required to position the conductor at the center point. However, since the Rogowski coil current sensor of the present invention uses the rod-type Rogowski coil segment 116, It is possible to measure the current flowing through the conductor through the electric induction phenomenon even if the conductor is arranged at various positions in the first through hole 118. [

The second PCB 200 includes a second PCB 220 and a second PCB 220. The second PCB 200 is spaced apart from the PCB 210 by a predetermined distance. The second substrate 200 has the same size as that of the first substrate 100. When the inner surface of the second substrate 200 and the inner surface of the first substrate 100 overlap each other, The first shield 120 and the second shield 220 are mechanically or electrically coupled to the first shield 120 so that the circuit elements in the first substrate 100 can be shielded by the first shield 120 and the second shield 220. [

The second PCB area 210 is located in the second shield 220 and corresponds to the first PCB area 110. Although the circuit elements used in the current sensor of the present invention are preferably disposed in the first PCB area 110, some circuit elements may be disposed in the second PCB area 210 as needed in terms of circuit design . The second PCB region 210 is formed to have a predetermined thickness so as to cover the circuit element portion 112, the ground impedance matching portion 114, and the rod-type Rogowski coil segment 116 in the first PCB region 110. And may include a housing area 212 having a step difference. The housing region 212 is formed in the first PCB region 110 so as to contact the grounding impedance matching portion 114 and the rod type Rogowski coil segment 116 or to prevent electrical interference It is preferable to have a step.

A second through hole 218 may be formed in the second PCB area 210 to correspond to the first through hole 118 of the first PCB area 110. Accordingly, when the first substrate 100 and the second substrate 200 are coupled to each other, a conductor through which the current flows can be passed through the first through hole 118 and the second through hole 218. [

When the lower end of the first through hole 118 and the second through hole 218 are open, the current passing through the first through hole 118 and the second through hole 218 Current measurements can be made by proximity. Furthermore, the first through hole 118 and the lower end of the second through hole 218 may be configured to be openable and closable.

It is also possible to form a conductor in a terminal shape on one side of the inside of the first through hole 118 and the second through hole 218 and to measure the current flowing through the terminal.

Although not shown in the drawings, the Rogowski coil current sensor of the present invention may further include a display unit including a display device so that the measured current value can be recognized from outside. The controller may further include a cutoff unit that cuts off a current flowing through the conductors located in the first through hole 118 and the second through hole 218 when the measured current value exceeds a reference value. In addition, the Rogowski coil sensor of the present invention may include an internal power source so that current measurement and display can be performed when there is no external power source. Further, the Rogowski coil current sensor of the present invention may further include a power calculation section for calculating power such as active power or reactive power by incorporating a voltage sensor or connecting the voltage sensor to the voltage sensor. The measured current value or power value may be transmitted to another electronic device using wire communication or wireless communication.

It is also possible to use a passive filter or the like for correcting or adjusting elements due to the shape and position of the rod-type Rogowski coil segment 116, the shape of the conductor, the value of the current flowing through the conductor, And may further include an active filter.

3 is a diagram illustrating the placement of a rod-type Rogowski coil segment in a Rogowski coil current sensor according to an embodiment of the present invention.

Referring to FIG. 3, the Rogowski coil current sensor of the present invention uses a rod-type Rogowski coil segment 116 in a first substrate 100 as a wire-wound inductor. In the conventional Rogowski coil 300, a coil is wound around a flexible air core, and the conductor is bent in a circular shape so that a conductor through which current flows is disposed inside the circular shape. Since the Rogowski coil 300 is bent in a circular shape It is difficult to form a shield for electromagnetic wave shielding and the cost is increased. The present invention does not use the circular Rogowski coil 300 but uses a rod-shaped Rogowski coil segment 116 having the same structure as the Rogowski coil 300 and having a rod- ) Is used as an inductor. Thus, the winding inductor that winds the coil on the core of air core can constitute more windings than the PCB coil and low current measurement becomes possible.

At this time, only one rod-shaped Rogowski coil segment 116 may be disposed, or a plurality of Rogowski coil segments 116 may be disposed to improve the sensitivity of current measurement. In particular, when the Rogowski coil segments 116 are arranged in an even number, the signals due to electromagnetic noise may be mutually compensated to improve the current measurement sensitivity.

4 is a fragmented perspective view of a Rogowski coil current sensor according to an embodiment of the present invention.

4, four capacitors C1, C2, C3, and C4 and one IC U1 are disposed in a first PCB region 110 of a first substrate 100, and a bar type Rogowski coil The state where the segment 116 is positioned can be seen. The ground impedance matching portion 114 is not exposed to the outside. These circuit elements are arranged to cover the housing area 212 in the second PCB area 210 when the second substrate 200 overlaps the first substrate 100. Therefore, even when the first substrate 100 and the second substrate 200 are sealed in the overlapped state, the circuit elements of the first substrate 100 are not brought into contact with the second substrate 200 or in a state of not causing electrical interference Shielding is performed.

5 is a rear exploded perspective view of a Rogowski coil current sensor according to an embodiment of the present invention.

Referring to FIG. 5, the Rogowski coil current sensor of the present invention includes a first shield 120 for shielding electromagnetic waves on a side surface and a rear surface of a first substrate 100, A second shield 220 for shielding electromagnetic waves is formed on the second shield 220. Of course, the first shield 120 and the second shield 220 are formed such that the first through hole 118 and the second through hole 218 where the conductors are disposed are opened.

It is preferable that the first shield 120 and the second shield 220 are formed of a conductive material such as metal and constitute a Faraday cage in which a plurality of grooves 122 and 222 are formed in a lattice shape on the back surface . At this time, copper or tin plating may be formed on the surface of the conductive material constituting the first shield 120 and the second shield 220 for effective electromagnetic wave shielding. By using such a Faraday cage structure, it is possible to prevent electromagnetic waves from flowing into the current sensor of the present invention from the outside. The Faraday cage structure may be formed in various shapes such as a hexagonal honeycomb, a square grid, and a circular grid.

6 is a view showing a state in which the outer shield and the circuit surface are spaced apart from each other in the component side of the Rogowski coil current sensor according to the embodiment of the present invention.

6, the Rogowski coil current sensor of the present invention includes a first PCB 100 and a second PCB 200 that are spaced apart from each other by a predetermined distance between the first PCB area 110 and the first shield 120, the first PCB 220 and the second PCB 220 may be spaced apart from each other by a predetermined distance. This spacing may occur in the first PCB area 110 or the second PCB area 210 or in the first shield 120 or the second shield 220 in the situation where the Rogowski coil current sensor of the present invention is moved. In order to reduce the influence of the eddy current. That is, the influence of the vortex generated in the first PCB area 110 or the second PCB area 210 on the first shield 120 or the second shield 220 due to the spacing space can be minimized. Even if a vortex is generated in the first shield 120 or the second shield 220, the influence on the first PCB area 110 or the second PCB area 210 can be minimized by the spacing space. The spacing space may have a spacing distance of about 0.1 mm.

7 is a circuit diagram of a ground impedance matching unit in a Rogowski coil current sensor according to an embodiment of the present invention.

7, the Rogowski coil current sensor of the present invention may additionally include a ground impedance matching portion 114, which is connected to the first impedance matching portion 114 by a shielding structure of the first shield 120, Since attenuation can occur, proper impedance is maintained to prevent signal attenuation. The ground impedance matching unit 114 may have the effect of minimizing the influence of the vortex caused by the Faraday cage of the first shield 120 and the second shield 220 while blocking attenuation of the signal.

For example, the power source VC and the neutral line NEU are respectively connected to the circuit element portion 112 through an inductor, and the ground impedance matching portion 114 is connected to the power source VC And one or two capacitors may be connected in parallel between the power supply VC and the neutral line NEU. This equivalent circuit may be adjusted to ground, open, short, or a specific impedance value depending on the operating environment, shape, frequency, etc. of the Rogowski coil current sensor of the present invention.

FIG. 8 is a perspective view of a Rogowski coil current sensor according to an embodiment of the present invention in which a first substrate and a second substrate are coupled.

Referring to FIG. 8, the Rogowski coil current sensor of the present invention combines the first substrate 100 and the second substrate 200 as shown in the drawing, thereby blocking the Rogowski coil segment and the circuit element from external electromagnetic waves And the measurement of the low current becomes possible.

Although a single Rogowski coil current sensor in which the first substrate 100 and the second substrate 200 are coupled is described herein, if there are a plurality of conductors to measure a current, A plurality of Rogowski coil current sensors may be formed in a structure that is coupled in a horizontal or vertical direction so that measurement can be performed simultaneously.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, . Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: first substrate 110: first PCB area
112: circuit element section 114: ground impedance matching section
116: Rogowski coil segment 118: First through hole
120: first shield 122: groove
200: second substrate 210: second PCB area
212: housing area 218: second through hole
220: second shield 222: groove
300: Rogowski coil

Claims (22)

A first substrate on which a rod-shaped Rogowski coil segment and circuit elements are mounted; And
A second substrate formed of a structure covering the Rogowski coil segment of the bar type and the circuit elements,
/ RTI >
Wherein the first substrate comprises:
A first PCB region including a circuit element portion to which the circuit elements are coupled, a ground impedance matching portion connected to the circuit element portion, and the rod-type Rogowski coil segment;
A first shield having a structure spaced apart from the first PCB area by a predetermined distance to surround the side surface and the back surface; And
A first through hole having a structure adjacent to the rod-type Rogowski coil segment so that a conductor to be subjected to current measurement can pass therethrough;
/ RTI >
The second substrate may include:
A second PCB region;
A second shield having a side and a rear surface spaced apart from the second PCB area by a predetermined distance; And
And a second through hole having a structure corresponding to the first through hole
Wherein the Rogowski coil current sensor comprises:
delete The method according to claim 1,
And the circuit element portion is disposed adjacent to the outside of the first shield.
The method according to claim 1,
The Rogowski coil current sensor is a wound type inductor in which a coil is wound around an air core.
delete The method according to claim 1,
Wherein the first through hole is formed in a rectangular, polygonal, or circular structure through which a current-carrying conductor can pass.
The method according to claim 1,
Wherein the second substrate has a size corresponding to a length and a length of the first substrate such that when the inner surface of the second substrate and the inner surface of the first substrate overlap to each other, A Rogowski coil current sensor comprising a mechanically or electrically coupled structure.
The method according to claim 1,
Wherein the second PCB region comprises the circuit element portion in the first PCB region, the ground impedance matching portion, and a housing region having a stepped thickness of a predetermined thickness to cover the rod- Coil current sensor.
The method according to claim 1,
Wherein the first through hole and the second through hole have a structure in which a lower end is opened.
The method according to claim 1,
Wherein the first through hole and the second through hole have a structure in which the lower end is openable and closable.
The method according to claim 1,
Wherein the first through-hole and the second through-hole are provided with terminal-type conductors through which current can flow in one side of the Rogowski coil current sensor.
The method according to claim 1,
Wherein a plurality of the rod-shaped Rogowski coil segments are disposed.
The method according to claim 1,
Wherein the first shield and the second shield are formed of a conductive material and have a Faraday cage structure in which a plurality of grooves are formed in a lattice shape on the back surface.
14. The method of claim 13,
Wherein the surfaces of the first shield and the second shield include copper or tin plating.
The method according to claim 1,
Wherein a spacing distance is formed between the first PCB area and the first shield, and a spacing distance is formed between the second PCB area and the second shield by a predetermined distance.
The method according to claim 1,
And a display unit for displaying the measured current value so that the measured current value can be recognized externally.
The method according to claim 1,
And a blocking portion capable of blocking a current flowing in a conductor located in the first through hole and the second through hole when the measured current value exceeds a reference value.
The method according to claim 1,
Further comprising an internal power supply to supply power to the Rogowski coil current sensor.
The method according to claim 1,
And a power calculation unit connected to the built-in voltage sensor or the external voltage sensor to calculate power.
The method according to claim 1,
And a communication unit capable of transmitting the measured current value to another electronic device using wired or wireless communication.
The method according to claim 1,
The shape and position of the rod-shaped Rogowski coil segment, the shape of the conductor located in the first through hole and the second aperture, the value of the current flowing through the conductor, and the passive A Rogowski coil current sensor further comprising a passive filter or an active filter.
The method according to claim 1,
A plurality of conductors for measuring currents are simultaneously provided so that a current can be simultaneously measured for these conductors, a plurality of conductors are disposed on the first substrate and the second substrate, .

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