CN201465698U - High-precision open type Rogowski coil - Google Patents
High-precision open type Rogowski coil Download PDFInfo
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- CN201465698U CN201465698U CN2009200923923U CN200920092392U CN201465698U CN 201465698 U CN201465698 U CN 201465698U CN 2009200923923 U CN2009200923923 U CN 2009200923923U CN 200920092392 U CN200920092392 U CN 200920092392U CN 201465698 U CN201465698 U CN 201465698U
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- rogowski coil
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Abstract
The utility model relates the field of current sensors for measuring high voltage heavy currents, in particular to a Rogowski coil of a printed circuit board. The utility model discloses a high-precision open type Rogowski coil, which comprises at least one layer of PCB consisting of two oppositely arranged boards at an interval; one end of each board is a normally-open opening; the PCB is provided with a coil formed by wires etched on the upper and lower sides of the PCB and wire posts connecting the wires on the upper and lower sides; a signal output end is arranged at the position of the normally-open opening; and the coils of the two boards are connected in series by connecting wires. Compared with the traditional open type Rogowski coil, the high-precision open type Rogowski coil has the characteristics of small volume, light weight, portability and the like. And measures such as uniform wire laying and return wire laying are adopted to eliminate mutual interference, and the precision of the high-precision open type Rogowski coil can reach a 0.05 grade.
Description
Technical field
The utility model relates to the current sensor field that high-voltage great-current is measured, and especially relates to a kind of printed circuit board (PCB) Luo-coil.
Background technology
Traditional Luo-coil that is used to measure electric current generally has opening, the two kinds of structures of remaining silent.Open type Rogowski coil is used for the occasion of conductor dismounting inconvenience more, as the live line measurement of conductor.Its installation and maintenance is comparatively convenient, but the precision of open type Rogowski coil is lower slightly, and owing to reasons such as mechanical structure and processing and manufacturings, open type Rogowski coil tends to the precise decreasing with the increase of service time or number of times.The open type Rogowski coil that is used for live line measurement at present mostly is the rigidity coil, is formed by the air core coil coiling, and it is unshakable in one's determination to adopt nonferromagnetic material to substitute tradition.When being used to measure, add shielding construction.Opening part links to each other by screw or other connectors.
Traditional Luo-coil often adopts enamelled wire is wound on the ring skeleton uniformly and makes, skeleton adopts nonferromagnetic materials such as plastics or pottery, the relative permeability of skeleton is identical with airborne relative permeability, and this is a notable feature of the hollow coil AC current transformer that is different from ribbon core.The typical structure of hollow coil as shown in Figure 6, the enamelled wire winding on the hollow coil evenly distributes, and the central shaft of coil is passed on the plane at every circle coil place; Columniform Primary Conductor is passed the hollow coil center during use, and both central shafts overlap.When open type Rogowski coil designs,, can select the internal diameter of open ended coil identical or approaching with the external diameter of Primary Conductor for the consistency and the accuracy of installing.
Among Fig. 6, Luo-coil comprises the skeleton 21 that two openings are oppositely arranged, spacing between two skeletons 21 is an opening 24, skeleton 21 is made by nonmagnetic substance, along the circumferential direction uniform winding has enamelled wire 22 on skeleton 21, and connecting line 23 is flexible coupling being wrapped in two enamelled wires 22 on the skeleton 21 respectively.
But in order to ensure the precision of measuring, the volume of open type Rogowski coil is generally bigger, and weight is given to carry and install and all caused certain difficulty about tens kilogram.
The accuracy of measurement of Luo-coil depends on a stable mutual inductance constant M.In order to ensure stablizing of coil coefficient of mutual inductance, must follow following principle when design: 1, loop density is constant; 2, skeleton constant cross section; 3, coil section is vertical with center line.
In addition, consider the environment for use of hollow coil, hollow coil adds the line that unrolls when coiling, promptly at the leading-out terminal place of coil, along the opposite direction of the coiling trend line that unrolls.The coiling of loop line make the vertical coil plane magnetic field on the coil windings with loop line on induced potential offset, can effectively resist the influence of external interference electromagnetic field, effectively improve the interference free performance of coil.
The utility model content
The purpose of this utility model is to provide a kind of volume less portative open type printed circuit board (PCB) Luo-coil, and can effectively improve certainty of measurement.
The technical solution of the utility model is:
A kind of high-accuracy open type Rogowski coil, it comprises one deck pcb board at least, every layer of pcb board is made up of two plates that are oppositely arranged; Be provided with spacing between two plates, an end opening of two plates is normal opening; Described pcb board is provided with coil, and coil is made of the wire column that is engraved in the lead on the pcb board top and bottom and connects the top and bottom lead; Be provided with signal output part at the described opening part of often opening; The coil of two plates is connected in series by connecting line.
It comprises the pcb board that a pair of stacked on top of one another is placed, and a pair of pcb board comprises two-layer pcb board, is provided with insulating blanket between the pcb board, and two-layer pcb board is arranged with mirror-image structure, connects by connecting lead between plate between the coil on the pcb board; Described mirror-image structure is that the lower surface of the upper surface of upper strata pcb board and lower floor's pcb board is in full accord, and the upper surface of the lower surface of upper strata pcb board and lower floor's pcb board is in full accord; The coil of adjacent two pairs of pcb boards is connected in series by lead.
It comprises the pcb board more than two pairs and two pairs, and every pair of pcb board comprises two-layer pcb board, is provided with insulating material between adjacent two pairs of pcb boards, and the coil of adjacent two pairs of pcb boards is connected in series by lead.
Epoxy layer in the middle of described pcb board comprises respectively is provided with conductor layer and insulation enamelled coating in the bilateral symmetry of middle epoxy layer.
Described plate is located in the shielding box, and shielding box and plate shape are suitable; Shielding box one side is connected by bindiny mechanism.
Described plate is located in the shielding box, and shielding box and plate shape are suitable; Shielding box is connected by bindiny mechanism.
Coil on the described pcb board is a semi-round ring shape.
Coil on the described pcb board is a semi-round ring shape.
Coil on the described pcb board is a semi-round ring shape.
Connect by screw between the described two-layer pcb board.
The utility model comprises two semi-round ring shape plates, is provided with spacing between two semi-round ring shape plates, and two semi-round ring shape plate one end openings are connected by bindiny mechanism, and the other end of two semi-round ring shape plates is for often opening opening; The semi-round ring shape plate is the pcb board of a pair of semi-round ring shape, along the circumferential direction is provided with coil on the pcb board, forms open type PCB hollow coil, and paired pcb board is arranged with mirror-image structure; The utility model also can be with how stacked to pcb board in addition, and every pair of pcb board comprises two-layer pcb board, and the coil on the pcb board is connected in series by connecting line between plate; The utility model also can only have the pcb board of pair of opposing, is connected by the line that is flexible coupling between the coil of two pcb boards.The utility model is compared with traditional open type Rogowski coil, and it is little, in light weight to have a volume, is convenient to install characteristics such as carry.And eliminate mutual interference by measures such as even wiring, loop line layouts, its precision can reach 0.05 grade.Based on the high accuracy of PCB technology realization, the live line measurement occasion that open type Rogowski coil can be applied to electric current, its high-precision characteristics can make its charged comparison of satisfying current transformer demands such as (verification or calibratings); The structure of open type and portable characteristics can reduce the difficulty of operating personnel's hot line job.
Simultaneously, in order effectively to eliminate influence perpendicular to coil plane external interference magnetic field, plate hollow coil has adopted this effectively " loop line " measure of mirror-image arrangement, has farthest eliminated the potential impact of external magnetic field, and this is than the more science and the practicality of method of traditional approximate counteracting.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment one;
Fig. 2 is the vertical view of single pcb board;
Fig. 3 is the A-A cutaway view of Fig. 2;
Fig. 4 is the B-B cutaway view of Fig. 2;
Fig. 5 is the expansion schematic diagram that the two plates of the utility model connect;
Fig. 6 is the structural representation of existing opening Luo-coil;
Fig. 7 is the structural representation of embodiment two;
Fig. 8 is the C-C cutaway view of Fig. 7.
Embodiment
Embodiment one
As shown in Figure 1, 2, the utility model comprises open type aluminum shielding box 17 and two-layer up and down pcb board (printed circuit board (PCB)) 1,13, stacked placement.Every layer of pcb board comprises two semi-round ring shape plates 15,16, and semi-round ring shape plate 15,16 is oppositely arranged.Shielding box 17 is divided into two parts up and down, and semi-round ring shape plate 15,16 lays respectively in two parts up and down of shielding box 17, and shielding box 17 centres are provided with the hole that current of confession passes through.Locate to be provided with bindiny mechanism 18 at the left side of shielding box 17 opening (very opening), with shielding box about in the of 17 two parts couple together, two parts can be around bindiny mechanism's 18 rotating opening about in the of 17 for shielding box.Shielding box 17 mainly is to be used for shielding external electromagnetic signal, prevents to disturb, and plays the inner semi-round ring shape plate 15,16 of protection simultaneously.Bindiny mechanism 18 is rotating shaft, perhaps other articulated mounting.Open the opening 6 of shielding box 17, make a current pass shielding box 17, bindiny mechanism 18 is open and close fast, and guarantees the accurately firm of installation.Simultaneously, in order to ensure the consistency of certainty of measurement of the present utility model and installation, the internal diameter r of open type aluminium shielding box 17 size is identical with the external diameter of a current.
Shown in Fig. 3,4, be provided with insulating blanket 9 (as thin insulating paper or ambroin etc.) between the pcb board 1,13, this can guarantee that the conductor on the two plate contact-making surfaces isolates mutually.Single pcb board is followed successively by insulation enamelled coating 10, conductor layer 11, middle epoxy layer 12, conductor layer 11, edge lacquer enamelled coating 10 from top to bottom.Pcb board all is carved with lead 2 on 1 top and bottom, and lead 2 is along the circumferential direction evenly distributed onboard, and each lead 2 two ends is equipped with lead via hole 3, lead via hole 3 passes pcb board 1, wire column 19 is located in the lead via hole 3, and the lead on the top and bottom 2 is coupled together, thereby constitutes coil.The pcb board 13 that is positioned at the below also has identical structure.
As shown in Figure 5, the coil of each semi-round ring shape plate all has pair of output U+ and U-, being positioned at the U-of semi-round ring shape plate 15 on upper strata and the U+ of semi-round ring shape plate 16 is connected by connecting line 4, being positioned at the U+ of semi-round ring shape plate 15 of lower floor and the U-of semi-round ring shape plate 16 is connected by connecting line 4, be positioned at the U-of semi-round ring shape plate 16 on upper strata and the U+ of the semi-round ring shape plate 16 that is positioned at lower floor at last and be connected, do not connected and remaining output U+ is connected with output line 5 respectively with U-by lead by connecting line between plate 8.Being equivalent to the coil that connection lead 8 will lay respectively on the pcb board 1,13 between plate is flexible coupling.
Open type PCB hollow coil is followed the design principle of air core coil in design, but because the substrate thickness limited (common sheet metal thickness is no more than 3mm) of printed circuit board (PCB), and increase along with thickness, the difficulty of processing that interlayer is electrically connected via hole 3 will increase and cause its reliability to reduce, so the PCB hollow coil generally is in series by the polylith pcb board.
The processing of printed circuit board (PCB) generally is to be controlled automatically by machine to carry out corrosion treatment, processing, and the control precision of printed-board technology is higher, can effectively guarantee the distribution symmetrically of multiturn coiling.Because the base material of printed circuit board (PCB) and copper-clad is combined closely and temperature stability is fabulous, even in violent variations in temperature, the shape of coil and the distribution of multiturn coil remain unanimity.Therefore only need after finishing coil design, just can carry out the making of plate coil automatically after utilizing special-purpose software to draw out pcb board figure by the print circuit plates making system.
Paired pcb board is arranged with mirror-image structure, as shown in Figure 5, the lower surface of the upper surface of pcb board 1 and pcb board 13 is in full accord, and the upper surface of the lower surface of pcb board 1 and pcb board 13 is in full accord, every pair of outlet terminal that becomes the mirror image pcb board to draw a pair of connection output line.Unroll in the similar conventional coil of effect that the pcb board mirror image the is arranged function of line, the influence that can effectively resist the external interference electromagnetic field effectively improves the interference free performance of coil.
Correspondence is provided with several (shown in the figure being 12) connecting holes 14 on pcb board 1,13 circumference, penetrates connecting hole 14 with screw 7 and then two pcb boards 1,13 is connected combination.
Manufacture method is: as shown in Figure 2, selected suitable diagonal angle on loop coil, with its subdivision is the lead via holes 3 of two semi-circular plates 15,16. in the selected opening both sides of an opening part of semi-circular plate 15,16, utilize connecting line 4 (soft fried twist lead) that its recovery is electrically connected, connecting line 4 is the line that is flexible coupling; Opposite side opening 6 keeps so that be installed on current. according to the position of air core coil output, draw output line 5.
Principle of the present utility model: in order effectively to eliminate influence perpendicular to coil plane external interference magnetic field, plate hollow coil is by this effectively " loop line " measure of mirror-image arrangement, farthest eliminated the potential impact of external magnetic field, than the more science and the practicality of method of traditional approximate counteracting.
The main key parameter of hollow coil has: the coefficient of mutual inductance of coil, coefficient of self-inductance, internal resistance and turn-to-turn capacitance.By contrast, the coefficient of self-inductance of hollow coil and coefficient of mutual inductance outbalance in the design of hollow coil.Because therefore structure and traditional hollow coil basically identical of plate hollow coil can calculate it with reference to the analytical method of traditional hollow coil.
Consider the needs (do not disconnect under the situation of Primary Conductor and carry out live line measurement) of actual application environment, the PCB Luo-coil is selected pincers types (i.e. " open type ") structure, and the structure of " open type " makes it can realize the installation and removal of current measuring device easily under the situation of not blocking a current carrying conductor.This pincers type hollow coil is made up of two semicircle pcb boards, during use, semicircle pcb board is separately fixed on the transformer casing, in the device running, two plate closings form complete hollow coil, have small gap between plate, this gap is referred to as extended distance.This extended distance that pincers type hollow coil exists can be regarded the non-homogeneous coiling of coil as, can learn that to the influence that its precision produces concrete influence sees the following form shown in 1 by the calculating that distributes.
Experiment parameter is:
Coil dimension: inner opening diameter 76mm; Outer maximum gauge: 190mm; Coil interior diameter 104mm; Coil overall diameter 174mm; Individual plates coil turn 200; Two piece plate mirror images connect.The conductor that is fixed on diameter and is 30mm carries out Super-Current Measurement outward, and the measurement current range is 300-900A.
The error that table 1 coil aperture causes (comprise off-centre, the neighbour disturbs mutually)
Can draw to draw a conclusion from above-mentioned theory analysis and calculating pincers type hollow coil:
1) principal element to the accuracy of measurement influence has: the size of gaps of the variation of a lead location, the interference of adjacent phase current and opening, what wherein have the greatest impact is the size of opening air gap.
2) at the pincers type hollow coil under this project technical conditions, at a lead off-center ± 2mm, adjacent conductor spacing mutually is 200mm, and when the opening air gap was 0.05mm, above-mentioned pincers type hollow coil overall error was: 0.0235%; When the opening air gap was 0.1mm, above-mentioned pincers type hollow coil overall error was: 0.047%.
So by the fixed form of mechanical device, make the opening air gap less than 0.1mm, then the overall error of pincers type hollow coil can be controlled in the 0.03%-0.05% scope.
Embodiment two
Be with embodiment one difference, shown in Fig. 7,8, semi-round ring shape plate 15,16 only is one deck pcb board 1, be not further divided into two-layerly, do not need between plate to connect lead 8 and connect pcb board 1 dimidiation, be respectively semi-round ring shape plate 15,16, the U+ of the U-of semi-round ring shape plate 15 and semi-round ring shape plate 16 is connected by connecting line 4, and remaining U+ and U-are output, are connected with output line 5 respectively.
Need to prove at last: the coil that is made of lead on the pcb board 2 and wire column 19 also can be other shapes such as rectangle, ellipse, does corresponding variation according to the difference of Primary Conductor shape to be measured.The shape of semi-round ring shape plate 15,16 is not limited only to semi-round ring shape, also can be similar to as required and replace with other shape.In addition, pcb board can be two pairs or more, each pcb board to comprising that two-layer employing mirror-image structure is arranged, with lead the coil on two pairs of adjacent pcb boards is connected in series, connect a remaining U+ of back and a U-as output, adopt the insulating material insulation between adjacent two pairs of pcb boards; The inboard opening shape of open type aluminium shielding box 17 and a current suitable, such as when a current is rectangle, inboard opening shape also should be rectangle mutually; Approximate variation so all falls within the protection range of the present utility model.
Claims (9)
1. high-accuracy open type Rogowski coil, it is characterized in that: it comprises one deck pcb board at least, every layer of pcb board is made up of two plates that are oppositely arranged; Be provided with spacing between two plates, an end opening of two plates is normal opening; Described pcb board is provided with coil, and coil is made of the wire column that is engraved in the lead on the pcb board top and bottom and connects the top and bottom lead; Be provided with signal output part at the described opening part of often opening; The coil of two plates is connected in series by connecting line.
2. high-accuracy open type Rogowski coil according to claim 1, it is characterized in that: it comprises the pcb board that a pair of stacked on top of one another is placed, a pair of pcb board comprises two-layer pcb board, be provided with insulating blanket between the pcb board, two-layer pcb board is arranged with mirror-image structure, connects by connecting lead between plate between the coil on the pcb board; Described mirror-image structure is that the lower surface of the upper surface of upper strata pcb board and lower floor's pcb board is in full accord, and the upper surface of the lower surface of upper strata pcb board and lower floor's pcb board is in full accord; The coil of adjacent two pairs of pcb boards is connected in series by lead.
3. high-accuracy open type Rogowski coil according to claim 2, it is characterized in that: it comprises the pcb board more than two pairs and two pairs, every pair of pcb board comprises two-layer pcb board, is provided with insulating material between adjacent two pairs of pcb boards, and the coil of adjacent two pairs of pcb boards is connected in series by lead.
4. according to arbitrary described high-accuracy open type Rogowski coil of claim 1-3, it is characterized in that: epoxy layer in the middle of described pcb board comprises respectively is provided with conductor layer and insulation enamelled coating in the bilateral symmetry of middle epoxy layer.
5. according to arbitrary described high-accuracy open type Rogowski coil of claim 1-3, it is characterized in that: described plate is located in the shielding box, and shielding box and plate shape are suitable; Shielding box one side is connected by bindiny mechanism.
6. high-accuracy open type Rogowski coil according to claim 4 is characterized in that: described plate is located in the shielding box, and shielding box and plate shape are suitable; Shielding box is connected by bindiny mechanism.
7. according to arbitrary described high-accuracy open type Rogowski coil of claim 1-3, it is characterized in that: the coil on the described pcb board is a semi-round ring shape.
8, high-accuracy open type Rogowski coil according to claim 4 is characterized in that: the coil on the described pcb board is a semi-round ring shape.
9. high-accuracy open type Rogowski coil according to claim 5 is characterized in that: the coil on the described pcb board is a semi-round ring shape.
10. according to claim 2 or 3 described high-accuracy open type Rogowski coils, it is characterized in that: connect by screw between the described two-layer pcb board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200923923U CN201465698U (en) | 2009-08-14 | 2009-08-14 | High-precision open type Rogowski coil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200923923U CN201465698U (en) | 2009-08-14 | 2009-08-14 | High-precision open type Rogowski coil |
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| CN201465698U true CN201465698U (en) | 2010-05-12 |
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| CN2009200923923U Expired - Lifetime CN201465698U (en) | 2009-08-14 | 2009-08-14 | High-precision open type Rogowski coil |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102087903A (en) * | 2010-12-14 | 2011-06-08 | 中国人民解放军海军工程大学 | Double-face symmetric wired printed circuit board (PCB) type Rogowski coil |
| CN102998507A (en) * | 2011-09-09 | 2013-03-27 | 通用电气公司 | Sensor devices and methods for use in sensing current through a conductor |
| CN103517554A (en) * | 2013-09-12 | 2014-01-15 | 国家电网公司 | Separate Rogowski coil |
| CN103630723A (en) * | 2013-11-25 | 2014-03-12 | 北京航空航天大学 | Rogowski coil sensing head suitable for Rogowski coil current sensor |
| GB2509965A (en) * | 2013-01-21 | 2014-07-23 | Cox Smith Consultants Ltd | Electrical current sensor incorporating a Rogowski coil with a narrow gap |
| US8829888B2 (en) | 2011-09-09 | 2014-09-09 | General Electric Company | Sensor devices and methods for use in sensing current through a conductor |
| US8872611B2 (en) * | 2011-08-18 | 2014-10-28 | General Electric Company | Rogowski coil assemblies and methods for providing the same |
| US8912807B2 (en) | 2011-09-09 | 2014-12-16 | General Electric Company | Sensor devices and methods for use in sensing current through a conductor |
| CN104377011A (en) * | 2014-11-20 | 2015-02-25 | 国家电网公司 | Half-open type electronic current transformer |
| CN104407200A (en) * | 2014-12-19 | 2015-03-11 | 国家电网公司 | Open type fault transient current sensor |
| US9075091B2 (en) | 2011-09-09 | 2015-07-07 | General Electric Company | Sensor devices and methods for use in sensing current through a conductor |
| US9081040B2 (en) | 2011-09-09 | 2015-07-14 | General Electric Company | Sensor devices and methods for use in sensing current through a conductor |
| CN104777445A (en) * | 2015-03-10 | 2015-07-15 | 三峡大学 | Electronic voltage transformer online checking system |
| US9304149B2 (en) | 2012-05-31 | 2016-04-05 | Pulse Electronics, Inc. | Current sensing devices and methods |
| CN106370894A (en) * | 2016-11-15 | 2017-02-01 | 威胜电气有限公司 | Open type Rogowski wire coil and application thereof |
| US9664711B2 (en) | 2009-07-31 | 2017-05-30 | Pulse Electronics, Inc. | Current sensing devices and methods |
| US9671434B2 (en) | 2014-08-08 | 2017-06-06 | Aclara Meters Llc | Sensor devices and methods for use in sensing current through a conductor |
| US9823274B2 (en) | 2009-07-31 | 2017-11-21 | Pulse Electronics, Inc. | Current sensing inductive devices |
| CN109100558A (en) * | 2018-06-06 | 2018-12-28 | 中国电力科学研究院有限公司 | A kind of Rogowski coil and current measuring device |
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2009
- 2009-08-14 CN CN2009200923923U patent/CN201465698U/en not_active Expired - Lifetime
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| US9823274B2 (en) | 2009-07-31 | 2017-11-21 | Pulse Electronics, Inc. | Current sensing inductive devices |
| US9664711B2 (en) | 2009-07-31 | 2017-05-30 | Pulse Electronics, Inc. | Current sensing devices and methods |
| CN102087903A (en) * | 2010-12-14 | 2011-06-08 | 中国人民解放军海军工程大学 | Double-face symmetric wired printed circuit board (PCB) type Rogowski coil |
| US8872611B2 (en) * | 2011-08-18 | 2014-10-28 | General Electric Company | Rogowski coil assemblies and methods for providing the same |
| US9075091B2 (en) | 2011-09-09 | 2015-07-07 | General Electric Company | Sensor devices and methods for use in sensing current through a conductor |
| US8829888B2 (en) | 2011-09-09 | 2014-09-09 | General Electric Company | Sensor devices and methods for use in sensing current through a conductor |
| US8912807B2 (en) | 2011-09-09 | 2014-12-16 | General Electric Company | Sensor devices and methods for use in sensing current through a conductor |
| CN102998507A (en) * | 2011-09-09 | 2013-03-27 | 通用电气公司 | Sensor devices and methods for use in sensing current through a conductor |
| US9081040B2 (en) | 2011-09-09 | 2015-07-14 | General Electric Company | Sensor devices and methods for use in sensing current through a conductor |
| US9429595B2 (en) | 2011-09-09 | 2016-08-30 | Aclara Meters Llc | Sensor devices and methods for use in sensing current through a conductor |
| CN102998507B (en) * | 2011-09-09 | 2016-12-21 | 亚克莱拉计量有限责任公司 | For sensing sensor device and the method for the electric current by conductor |
| US10048293B2 (en) | 2012-05-31 | 2018-08-14 | Pulse Electronics, Inc. | Current sensing devices with integrated bus bars |
| US9304149B2 (en) | 2012-05-31 | 2016-04-05 | Pulse Electronics, Inc. | Current sensing devices and methods |
| GB2509965A (en) * | 2013-01-21 | 2014-07-23 | Cox Smith Consultants Ltd | Electrical current sensor incorporating a Rogowski coil with a narrow gap |
| GB2509965B (en) * | 2013-01-21 | 2016-05-25 | Cox-Smith Consultants Ltd | Electrical Current Sensor |
| CN103517554A (en) * | 2013-09-12 | 2014-01-15 | 国家电网公司 | Separate Rogowski coil |
| CN103630723A (en) * | 2013-11-25 | 2014-03-12 | 北京航空航天大学 | Rogowski coil sensing head suitable for Rogowski coil current sensor |
| US9671434B2 (en) | 2014-08-08 | 2017-06-06 | Aclara Meters Llc | Sensor devices and methods for use in sensing current through a conductor |
| CN104377011A (en) * | 2014-11-20 | 2015-02-25 | 国家电网公司 | Half-open type electronic current transformer |
| CN104407200B (en) * | 2014-12-19 | 2017-07-11 | 国家电网公司 | A kind of open-type fault transient state current sensor |
| CN104407200A (en) * | 2014-12-19 | 2015-03-11 | 国家电网公司 | Open type fault transient current sensor |
| CN104777445A (en) * | 2015-03-10 | 2015-07-15 | 三峡大学 | Electronic voltage transformer online checking system |
| CN106370894A (en) * | 2016-11-15 | 2017-02-01 | 威胜电气有限公司 | Open type Rogowski wire coil and application thereof |
| CN109100558A (en) * | 2018-06-06 | 2018-12-28 | 中国电力科学研究院有限公司 | A kind of Rogowski coil and current measuring device |
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