CN211125231U - Open-close type Rogowski coil and current transformer - Google Patents
Open-close type Rogowski coil and current transformer Download PDFInfo
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- CN211125231U CN211125231U CN202020049598.4U CN202020049598U CN211125231U CN 211125231 U CN211125231 U CN 211125231U CN 202020049598 U CN202020049598 U CN 202020049598U CN 211125231 U CN211125231 U CN 211125231U
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Abstract
The utility model provides an open-close type luo shi coil and current transformer, wherein, open-close type luo shi coil includes coil skeleton, coil skeleton is the annular and includes at least one air gap opening, and the coil, the spiral shell coil that the coil set up for encircleing coil skeleton, it is greater than the coil density of keeping away from air gap opening to close on air gap opening's coil density, adjust through the structure according to open-close type luo shi coil to correspond the number of turns, add the circle to the coil that closes on air gap opening position and set up, so that the coil density that closes on the air gap is greater than the coil density of keeping away from the air gap, and then compensate the magnetic flux of loss, thereby improve the precision of open-close type luo shi coil.
Description
Technical Field
The utility model belongs to the technical field of current transformer, especially, relate to an open-close type luo shi coil and current transformer.
Background
At present, the current measuring mode on a power frequency circuit mainly comprises a CT mode and a Rogowski coil mode, wherein the CT coil usually uses silicon steel as a magnetic conductive material. The CT using silicon steel materials often has the problems of complicated structure, heavy weight, low self-resonant frequency, and easy saturation under large current. The Rogowski coil has the advantages of simple structure, light weight and low possibility of saturation under high current. For the installation of convenient equipment, the rogowski coil of some equipment uses open-close type structure, can be more convenient install in the application scene of difference like this, but the rogowski coil that uses open-close type structure inevitably appears the clearance after the installation is accomplished, and the introduction in clearance can influence the precision of rogowski coil measuring current.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides an open-close type rogowski coil, which aims to improve the accuracy of the open-close type rogowski coil for measuring current.
The utility model discloses the first aspect of the embodiment provides an open-close type rogowski coil, and this open-close type rogowski coil includes:
a bobbin that is annular and includes at least one air gap opening;
the coil is a spiral coil arranged around the coil framework, and the density of the coil close to the air gap opening is greater than that of the coil far away from the air gap opening.
In one embodiment, the coil is stacked and looped adjacent to the air gap opening and looped in a single turn away from the air gap opening.
In one embodiment, the coil framework comprises an air gap opening, the coil comprises a first sub-coil, a second sub-coil and a third sub-coil which are sequentially connected in series, the first sub-coil and the third sub-coil are close to the air gap opening, the second sub-coil is far away from the air gap opening, and both the coil density of the first sub-coil and the coil density of the third sub-coil are greater than the coil density of the second sub-coil.
In one embodiment, the winding angle of the laminated winding ranges from-40 degrees to 0 degrees and from 0 degrees to +40 degrees with any boundary position of the air gap opening as a 0-degree position.
In one embodiment, the coil bobbin comprises a first PCB substrate and a second PCB substrate, wherein the first PCB substrate and the second PCB substrate are semi-annular and are symmetrically arranged to form a first air gap opening and a second air gap opening which are two air gap openings;
the coil comprises a first sub-coil, a second sub-coil and a third sub-coil which are sequentially connected in series, and a fourth sub-coil, a fifth sub-coil and a sixth sub-coil which are sequentially connected in series;
the first sub-coil surrounds the first PCB substrate and is close to the first air gap opening, the third sub-coil surrounds the first PCB substrate and is close to the second air gap opening, the second sub-coil surrounds the first PCB substrate and is far away from the first air gap opening and the second air gap opening, and both the coil density of the first sub-coil and the coil density of the third sub-coil are greater than the coil density of the second sub-coil;
the fourth sub-coil surrounds the second PCB substrate and is close to the second air gap opening, the sixth sub-coil surrounds the second PCB substrate and is close to the first air gap opening, the fifth sub-coil surrounds the second PCB substrate and is far away from the first air gap opening and the second air gap opening, and the coil density of the fourth sub-coil and the coil density of the sixth sub-coil are both greater than the coil density of the fifth sub-coil.
In one embodiment, with any boundary position of the first air gap opening as a 0-degree position, winding included angles of the laminated winding range from-15 degrees to 0 degrees, from 0 degrees to 15 degrees, from 165 degrees to 180 degrees and from 180 degrees to 195 degrees.
A second aspect of the embodiments of the present invention provides an open-close type rogowski coil, which includes:
the coil framework is annular and comprises m air gap openings;
the coil is a spiral coil uniformly wound around the coil framework, the density of the coil at n positions of the coil framework is 0, and n corresponding air gaps are formed; and m + n is a multiple of 4, and the m air gap openings and the n air gaps are uniformly distributed on the circumference of the coil framework.
In one embodiment, the bobbin includes one air gap opening, the density of the coil at three positions of the bobbin is 0, three corresponding air gaps are formed, and the one air gap opening and the three air gaps are uniformly distributed on the circumference of the bobbin.
In one embodiment, the coil framework of the open-close type rogowski coil comprises a first PCB substrate and a second PCB substrate, wherein the first PCB substrate and the second PCB substrate are both semi-annular and are symmetrically arranged to form a first air gap opening and a second air gap opening which are two air gap openings;
the density of coil in a position department of first PCB base plate is 0, the density of coil in a position department of second PCB base plate is 0, forms two corresponding air gaps, two air gap openings with two air gaps evenly distributed in the circumference of coil skeleton.
The utility model discloses the third aspect of embodiment provides a current transformer, this current transformer include leading-out terminal and as above open-close type luo shi coil, leading-out terminal with coil electric connection.
The utility model discloses a structure according to open-close type luo shi coil carries out the adjustment that corresponds number of turns or air gap, wherein, when the air gap opening that the original structure of coil skeleton that adopts leads to because of the installation, coil that closes on air gap opening position adds the circle and sets up, so that the coil density that closes on the air gap is greater than the coil density of keeping away from the air gap, and then compensate the magnetic flux of loss, thereby improve open-close type luo shi coil measuring current's precision, perhaps increase a plurality of air gaps in addition through another kind of wire winding mode, make a plurality of air gaps evenly distributed set up in annular skeleton, the air gap of increase can be repaiied because luo shi coil installation air gap leads to changing discontinuous problem through luo shi coil's inside magnetic flux, reach the purpose that improves open-close type luo shi coil.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a first schematic structural diagram of an open-close type rogowski coil provided by an embodiment of the present invention;
fig. 2 is a schematic view of a second structure of an opening-closing rogowski coil according to an embodiment of the present invention;
fig. 3 is a schematic view of a third structure of an opening-closing rogowski coil according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a fourth structure of an opening-closing rogowski coil according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution in the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention and the above-described drawings are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
A first aspect of the embodiments of the present invention provides an open-close type rogowski coil.
As shown in fig. 1 and 2, the open-close type rogowski coil includes:
a bobbin (not shown) that is annular and includes at least one air gap opening;
the coil, the coil is the spiral coil that encircles the coil skeleton setting, and the coil density that is close to the air gap opening is greater than the coil density who keeps away from the air gap opening.
In the embodiment, the coil framework is made of non-ferromagnetic materials and has the characteristics of light weight, strong anti-interference capability and the like, the Rogowski coil works on the principle that the coil framework surrounds a conductor to be detected, a magnetic field around the conductor can be changed along with the change of current in the conductor, and a coil on the framework can induce electromotive force accordingly. According to mathematical derivation, the electromotive force is in direct proportion to the derivative of the current in the conductor, and the proportionality coefficient is related to the number of turns of the coil, the cross section of the bobbin, the magnetic conductivity and the like, for the convenience of installation, the rogowski coil is generally provided with an air gap opening for the convenience of installation, the opening does not surround the coil, so that an air gap is formed, as shown in fig. 1, the coil bobbin is provided with an air gap 11, the coil sequentially surrounds the coil bobbin, or as shown in fig. 2, the coil bobbin is provided with a first PCB substrate and a second PCB substrate which are symmetrically arranged, two air gap openings 11 and 12 are formed between the two substrates, the increase of the air gap opening causes the loss of magnetic flux and the current unevenness in the measuring process, so that the current detection accuracy is reduced, therefore, in the embodiment, the number of turns of the coil is.
As shown in fig. 1 and fig. 2, the coil skeleton is provided with the air gap opening because of the mounting means difference, increases the coil number of turns on the coil skeleton that closes on the air gap opening part this moment simultaneously, and then improves coil density, and the number of turns that increase, the mode of coiling and the arc length of coiling correspond the setting according to the measurement accuracy demand, and after increasing coil density, the magnetic flux of air gap department increases, and then compensaties the magnetic flux by original air gap loss to improve the precision of open-close type luo shi coil measuring current.
The utility model discloses a structure according to open-close type luo shi coil carries out the adjustment that corresponds number of turns or air gap, wherein, when the air gap opening that the original structure of coil skeleton that adopts leads to because of the installation, adds the circle to the coil that closes on air gap opening position and sets up to the coil density that makes and closes on the air gap is greater than the coil density of keeping away from the air gap, and then compensaties the magnetic flux of loss, thereby improves open-close type luo shi coil measuring current's precision.
As shown in fig. 1 and 2, in an embodiment, the coil is wound in a stacked manner at a position close to the air gap opening, and is wound in a single turn at a position far from the air gap opening, so that the density of the coil at the position close to the air gap is greater than that of the coil at the position far from the air gap, for example, two ends of the air gap are respectively wound in a stacked manner to be respectively supplemented, the number of supplemented turns at each side is 4, the total number of supplemented turns is 8, after the density of the coil is increased, the magnetic flux at the air gap is increased, and then the magnetic flux lost by the original air gap is compensated, so that the accuracy of the open-.
As shown in fig. 1, in an embodiment, the coil bobbin includes an air gap opening 11, the coil includes a first sub-coil 21, a second sub-coil 22 and a third sub-coil 23 which are connected in series in sequence, the first sub-coil 21 and the third sub-coil 23 are close to the air gap opening 11, the second sub-coil 22 is far away from the air gap opening 11, both the coil density of the first sub-coil 21 and the coil density of the third sub-coil 23 are greater than the coil density of the second sub-coil 21, in this embodiment, the coil bobbin is in a non-closed state because of the existence of the air gap opening, the coil is correspondingly wound on the coil bobbin, the magnetic flux at the air gap opening 11 is reduced, the first sub-coil 21, the second sub-coil 22 and the third sub-coil 23 are connected in series, at this time, the first sub-coil 21 and the third sub-coil 23 are compensated in a laminated manner by performing a coiling setting on the first sub-coil 21 and the second sub, the number of the compensated loops is not limited, and the compensated loops are set according to the measurement precision requirement and the volume of the open-close type Rogowski coil, for example, 4 compensated loops are formed for each coil, the number of the compensated loops is 8, after the density of the coil is increased, the magnetic flux at the position of the air gap opening 11 is increased, and then the magnetic flux lost by the original air gap is compensated, so that the precision of the open-close type Rogowski coil in current measurement is improved.
Simultaneously, the arc length scope of adding the circle can correspond the setting according to the demand, and the length of arc length can be according to the formula:
determining, wherein θ is a winding angle formed by taking a geometric center of a coil frame as a center of a circle, an air gap position and a critical position of a coil which is wound in a laminated manner and is close to the air gap, R is a radius of an open-close type rogowski coil, the winding angle can be correspondingly selected through a mapping relation of measurement accuracy and the winding angle which is designed in an early stage, and further an arc length of winding is determined, in one embodiment, any boundary position of an air gap opening 11 is taken as a 0-degree position, and the winding angle of the laminated winding ranges from-40 degrees to 0 degrees and from 0 degrees to +40 degrees.
As shown in fig. 2, in one embodiment, the coil bobbin includes a first PCB substrate (not shown) and a second PCB substrate (not shown), both of which are semi-annular and symmetrically disposed to form two air gap openings, namely a first air gap opening 11 and a second air gap opening 12;
the coil comprises a first sub-coil 21, a second sub-coil 22 and a third sub-coil 23 which are sequentially connected in series, and a fourth sub-coil 24, a fifth sub-coil 25 and a sixth sub-coil 26 which are sequentially connected in series;
the first sub-coil 21 surrounds the first PCB substrate and is close to the first air gap opening 11, the third sub-coil 23 surrounds the first PCB substrate and is close to the second air gap opening 12, the second sub-coil 23 surrounds the first PCB substrate and is far away from the first air gap opening 11 and the second air gap opening 12, and both the coil density of the first sub-coil 21 and the coil density of the third sub-coil 23 are greater than that of the second sub-coil 22;
the fourth sub-coil surrounds the second PCB substrate and is close to the second air gap opening 12, the sixth sub-coil 26 surrounds the second PCB substrate and is close to the first air gap opening 11, the fifth sub-coil 25 surrounds the second PCB substrate and is far away from the first air gap opening 11 and the second air gap opening 12, and the coil density of the fourth sub-coil 24 and the coil density of the sixth sub-coil 26 are both greater than the coil density of the fifth sub-coil 25.
In the embodiment, the two PCB substrates are symmetrically arranged, when the open-close type rogowski coil is installed, only the two PCB substrates need to be butted and fixed, the two PCB substrates can be directly sleeved on an installed conducting wire without installing the conducting wire again, the coil can be arranged before or after installation, the number of turns of the first sub-coil 21, the third sub-coil 23, the fourth sub-coil 24 and the sixth sub-coil 26 is correspondingly adjusted according to the size of an air gap opening generated when the two PCB substrates are installed, wherein the first sub-coil 21, the third sub-coil 23, the fourth sub-coil 24 and the sixth sub-coil 26 are wound in a stacking mode, the number of turns of the added coil is equal, and the winding angles of the added coil of each coil are respectively-15 degrees to 0 degrees, 0 degrees to 15 degrees, 165 degrees to 180 degrees and 180 degrees to 195 degrees.
A second aspect of the embodiments of the present invention provides an open-close type rogowski coil.
As shown in fig. 3 and 4, in the present embodiment, the adjustment of the magnetic flux is performed by adding a symmetric air gap, so as to ensure that the magnetic flux and the sampling current are uniformly changed, wherein the open-close type rogowski coil includes:
a bobbin (not shown) which is annular and comprises m air gap openings;
the coil is a spiral coil uniformly wound around the coil framework, the density of the coil at n positions of the coil framework is 0, and n corresponding air gaps are formed; wherein m + n is a multiple of 4, and the m air gap openings and the n air gaps are uniformly distributed on the circumference of the coil framework.
In this embodiment, different winding manners of the coil are correspondingly selected according to the structure of the coil frame to increase the air gap, so that the increased air gap and the coil frame are uniformly distributed on the circumference of the coil frame, and further, uniform change of magnetic flux of the open-close type rogowski coil and current generated by induction is ensured, thereby improving detection precision.
The utility model discloses an adjustment of air gap is carried out according to open-close type luo shi coil's structure, wherein, when the air gap opening that the original structure of coil skeleton that adopts leads to because of the installation, increase a plurality of air gaps in addition through the wire winding mode for a plurality of air gaps evenly distributed sets up in annular skeleton, and the air gap of increase can be repaiied because luo shi coil installation air gap leads to the discrete problem of the inside magnetic flux change of coil through luo shi coil, reaches the purpose that improves open-close type luo shi coil measuring current's precision equally.
As shown in fig. 1, in one embodiment, the bobbin includes one air gap opening 11, the density of the coil at three positions of the bobbin is 0, and three corresponding air gaps 31, 32 and 33 are formed, and the one air gap opening 11 and the three air gaps 31, 32 and 33 are uniformly distributed on the circumference of the bobbin.
In this embodiment, the original framework of the coil bobbin is an air gap opening 11, in order to reduce the wiring complexity and the winding cost, three air gaps 31, 32 and 33 are formed on the coil bobbin in a jumper manner, adjacent coils are directly connected through leads 41, 42 and 43, the formed air gaps 31, 32 and 33 are equal to the size of the air gap opening 11 of the coil bobbin, the three air gaps 31, 32 and 33 respectively form an angle difference of 90 °, 180 ° and 270 ° with the air gap opening 11 of the coil bobbin, and the coil density between each air gap and the air gap opening 11 is equal.
As shown in fig. 2, in one embodiment, the coil bobbin includes a first PCB substrate and a second PCB substrate, both of which are semi-annular and symmetrically disposed to form two air gap openings, namely a first air gap opening 11 and a second air gap opening 12;
the density of the coil at one position of the first PCB substrate is 0, the density of the coil at one position of the second PCB substrate is 0, two corresponding air gaps 31 and 32 are formed, and the two air gap openings 11 and 12 and the two air gaps 31, 32 and 33 are uniformly distributed on the circumference of the bobbin.
In this embodiment, two PCB substrates are symmetrically mounted to form two air gap openings 11 and 12, in order to reduce the wiring complexity and the winding cost, two air gaps 31 and 32 are formed on the coil bobbin in a jumper manner, that is, one air gap 31 is formed on the first PCB substrate, another air gap 32 is formed on the second PCB substrate, adjacent coils on the first PCB substrate are directly connected by a wire 41, adjacent coils on the second PCB substrate are directly connected by a wire 42, the sizes of the formed air gaps 31 and 32 are equal to the sizes of the air gap openings 11 and 12 of the coil bobbin, the two air gaps 31 and 32 respectively correspond to the two air gap openings 11 and 12 of the coil bobbin to form an angle difference of 90 °, and the coil densities between each air gap and the air gap opening are equal.
The embodiment of the utility model provides a still provide a current transformer, current transformer include leading-out terminal (not shown) and open-close type luo shi coil, and the concrete structure of open-close type luo shi coil refers to above-mentioned embodiment, because current transformer has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here. The lead-out terminal is electrically connected with the coil, and the lead terminal feeds back current induced by the open-close type Rogowski coil to the control system, so that the current value of the conductor to be detected can be obtained.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. An open-close rogowski coil, comprising:
a bobbin that is annular and includes at least one air gap opening;
the coil is a spiral coil arranged around the coil framework, and the density of the coil close to the air gap opening is greater than that of the coil far away from the air gap opening.
2. The open-close rogowski coil of claim 1, wherein the coil is stacked and looped adjacent the air gap opening and single-looped distal the air gap opening.
3. The open-close type rogowski coil of claim 2, wherein the coil bobbin comprises an air gap opening, the coil comprises a first sub-coil, a second sub-coil and a third sub-coil which are sequentially connected in series, the first sub-coil and the third sub-coil are close to the air gap opening, the second sub-coil is far away from the air gap opening, and both the coil density of the first sub-coil and the coil density of the third sub-coil are greater than the coil density of the second sub-coil.
4. The open-close type rogowski coil of claim 3, wherein with any boundary position of the air gap opening as a 0 ° position, winding angles of the laminated winding range from-40 ° to 0 ° and from 0 ° to +40 °.
5. The open-close type rogowski coil of claim 2, wherein the coil bobbin comprises a first PCB substrate and a second PCB substrate, and the first PCB substrate and the second PCB substrate are semi-annular and are symmetrically arranged to form two air gap openings, namely a first air gap opening and a second air gap opening;
the coil comprises a first sub-coil, a second sub-coil and a third sub-coil which are sequentially connected in series, and a fourth sub-coil, a fifth sub-coil and a sixth sub-coil which are sequentially connected in series;
the first sub-coil surrounds the first PCB substrate and is close to the first air gap opening, the third sub-coil surrounds the first PCB substrate and is close to the second air gap opening, the second sub-coil surrounds the first PCB substrate and is far away from the first air gap opening and the second air gap opening, and both the coil density of the first sub-coil and the coil density of the third sub-coil are greater than the coil density of the second sub-coil;
the fourth sub-coil surrounds the second PCB substrate and is close to the second air gap opening, the sixth sub-coil surrounds the second PCB substrate and is close to the first air gap opening, the fifth sub-coil surrounds the second PCB substrate and is far away from the first air gap opening and the second air gap opening, and the coil density of the fourth sub-coil and the coil density of the sixth sub-coil are both greater than the coil density of the fifth sub-coil.
6. The open-close type rogowski coil of claim 5, wherein with any boundary position of the first air gap opening as a 0 ° position, winding included angles of the laminated winding range from-15 ° to 0 °, from 0 ° to 15 °, from 165 ° to 180 °, and from 180 ° to 195 °, respectively.
7. An open-close rogowski coil, comprising:
the coil framework is annular and comprises m air gap openings;
the coil is a spiral coil uniformly wound around the coil framework, the density of the coil at n positions of the coil framework is 0, and n corresponding air gaps are formed; and m + n is a multiple of 4, and the m air gap openings and the n air gaps are uniformly distributed on the circumference of the coil framework.
8. The open-close rogowski coil of claim 7, wherein the bobbin comprises one air gap opening, the density of the coil at three locations of the bobbin is 0, forming three corresponding air gaps, and the one air gap opening and the three air gaps are evenly distributed around the circumference of the bobbin.
9. The open-close type rogowski coil of claim 7, wherein the coil bobbin comprises a first PCB substrate and a second PCB substrate, wherein the first PCB substrate and the second PCB substrate are semi-annular and are symmetrically arranged to form two air gap openings, namely a first air gap opening and a second air gap opening;
the density of coil in a position department of first PCB base plate is 0, the density of coil in a position department of second PCB base plate is 0, forms two corresponding air gaps, two air gap openings with two air gaps evenly distributed in the circumference of coil skeleton.
10. A current transformer comprising an outgoing terminal and an open-close type rogowski coil as claimed in any one of claims 1 to 9, wherein the outgoing terminal is electrically connected to the coil.
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| CN202020049598.4U CN211125231U (en) | 2020-01-09 | 2020-01-09 | Open-close type Rogowski coil and current transformer |
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| CN202020049598.4U CN211125231U (en) | 2020-01-09 | 2020-01-09 | Open-close type Rogowski coil and current transformer |
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| CN113436856A (en) * | 2021-06-11 | 2021-09-24 | 优利德科技(中国)股份有限公司 | Hollow coil sensing complementary device, pincerlike multimeter and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113436856A (en) * | 2021-06-11 | 2021-09-24 | 优利德科技(中国)股份有限公司 | Hollow coil sensing complementary device, pincerlike multimeter and preparation method thereof |
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