CN101122619A - Flexible rogowski coil for impulse current measurement - Google Patents
Flexible rogowski coil for impulse current measurement Download PDFInfo
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- CN101122619A CN101122619A CNA2007101217966A CN200710121796A CN101122619A CN 101122619 A CN101122619 A CN 101122619A CN A2007101217966 A CNA2007101217966 A CN A2007101217966A CN 200710121796 A CN200710121796 A CN 200710121796A CN 101122619 A CN101122619 A CN 101122619A
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Abstract
The invention relates to a flexible Roe coil for pulse current measurement, pertaining to the high-pressure measurement technology in the art of electricians. The invention includes a casing, a metal shielding layer, a flexible frame, a coil, a conductive core wire and an integrator. The casing, metal shielding and flexible frame are relatively fixed as concentric rings from outside to inside and one side of the ring is provided with an opening. The coil is wound on the flexible frame, the conductive core wire is buried in the flexible frame and the coil is connected with the integrator. The the flexible Roe coil of the invention improves the prior rigid casing and coil frame into a flexible structure and the flexible coil is designed to have an opening with the head end connected with the tail end through a connector, so that Roe coil has the advantages of good flexibility, easy installation and dismantling, compact and portable, simple and convenient installation, which is applicable to field use. Compared with the prior rigid Roe coil, the invention greatly expands the application range of Roe coil.
Description
Technical field
The present invention relates to a kind of flexible Luo-coil that is used for impulse current measurement, relate in particular to the measurement of lightning current, belong to the electrical field High-Voltage Measurement Technology.
Background technology
The measurement of dash current always is a relatively thing of difficulty, and is just very complicated to the measurement of lightning current in producing as reality, mainly adopts shunt and Luo-coil as current sensor to lightning current measuring at present.Although shunt has precision height, the wide advantage of response band, because it is connected in the tested loop, there is not electrical isolation with follow-up measuring equipment, when tested electric current is big, can threaten the safety of precision equipment and testing crew.Another kind method generally adopts Luo-coil that lightning current is sensed as voltage signal on the coil, again signal is carried out the signal that passive integration obtains lightning current, then further follow-up work such as sampling processing.Luo-coil utilizes the law of electromagnetic induction, and the mode by magnetic field coupling becomes voltage signal with tested induction by current, and becomes differential relationship with the source electric current, again this voltage signal is carried out just can obtaining after the Integral Processing waveform of tested electric current.Owing to by the magnetic field coupling, realized the isolation of pair side, source between Luo-coil and the measured conductor, can not work the mischief to low-pressure side equipment and personnel's safety.Simultaneously, do not contain ferromagnetic material in the framework material of Luo-coil, saturated phenomenon can not occur when measuring big electric current, in its measurement range, have good linearty.Based on These characteristics as can be known Luo-coil be fit to be used as the sensor of measuring lightning current.
Figure 1 shows that traditional rigid Luo-coil synoptic diagram.Among Fig. 1, the 1st, current passes Luo-coil, the 2nd, the metal shell of rigid Luo-coil, be a closed shape, the 3rd, the metal screen layer that is provided with in order to shield external interference, the 4th, be embedded in the coil hard skeleton in the shell 2, be generally epoxide resin material, 5 is the coil on the skeleton, and 6 is the coil loop line, generally is to engrave a ring groove on skeleton, lead is imbedded wherein, 7 is integrator again.This Luo-coil utilizes the law of electromagnetic induction, the Pulse Electric that the flows through current induced voltage signal on Luo-coil that fails to be convened for lack of a quorum, and after this signal carried out integration through integrator 7, the voltage signal that obtains was directly proportional with electric current in the current.
The shortcoming of above-mentioned existing rigid Luo-coil is an enclosure closed, and current must pass coil, therefore makes troubles and is restricted in some use occasion meeting.
Summary of the invention
The objective of the invention is to propose a kind of flexible Luo-coil that is used for impulse current measurement, change the structure and the material therefor of existing Luo-coil, so that it is abominable in condition of work, the convenient down use of the working environment that range of temperature is bigger.
The flexible Luo-coil that is used for impulse current measurement that the present invention proposes comprises: sleeve pipe, metal screen layer, flexible back bone, coil, conductive core line and integrator.Sleeve pipe, metal screen layer and the flexible back bone concentric relative fixed of ecto-entad successively become annulus, are an opening in a side of annulus.Coil is on flexible back bone, and conductive core line is embedded in the flexible back bone, and an end of coil is connected with an end of integrator, and the other end of coil is connected with the other end of integrator by the conductive core line in the flexible back bone.
Sleeve pipe in the above-mentioned flexible Luo-coil can be made by material contracting with heat.
Flexible back bone in the above-mentioned flexible Luo-coil can be made by soft insulating material, is for example made by silicon rubber.
Integrator in the above-mentioned flexible Luo-coil can be made up of the resistance and the electric capacity that become T shape to connect.
The flexible Luo-coil that is used for impulse current measurement that the present invention proposes, its advantage is that in the past rigid sleeve pipe and coil rack improvement are become soft structure, flexible coil is designed to open type, and the first and last end connects by connector, thereby makes Luo-coil have good pliability, be easy to installation and removal, exquisite light, install very convenient simply, be applicable to open-air use, compare with existing rigid Luo-coil, expanded the range of application of Luo-coil greatly.
Description of drawings
Fig. 1 is the structural representation of existing rigid Luo-coil.
Fig. 2 is the structural representation of the flexible coil that proposes of the present invention.
Fig. 3 is the circuit theory diagrams of integrator in the flexible coil of the present invention.
Among Fig. 1 and Fig. 2, the 1st, current, the 2nd, metal shell, the 3rd, metal screen layer, the 4th, hard skeleton, the 5th, the coil on the skeleton, the 6th, the coil loop line, the 7th, integrator, the 8th, heat-shrinkable T bush, the 9th, flexible back bone, the 10th, conductive core line uses as the coil loop line.
Specific implementation method
The flexible Luo-coil that is used for impulse current measurement that the present invention proposes, its structure comprises as shown in Figure 2: sleeve pipe 8, metal screen layer 3, flexible back bone 9, coil 5, conductive core line 10 and integrator 7.Sleeve pipe 8, metal screen layer 3 and the flexible back bone 9 concentric relative fixed of ecto-entad successively become annulus, are an opening in a side of annulus.Coil 5 is on flexible back bone 9, and conductive core line 10 is embedded in the flexible back bone 9, and an end of coil 5 is connected with an end of integrator 7, and the other end of coil 5 is connected by the other end of the conductive core line in the flexible back bone 9 10 with integrator 7.
Sleeve pipe in the above-mentioned flexible Luo-coil can be made by material contracting with heat.
Flexible back bone in the above-mentioned flexible Luo-coil can be made by soft insulating material.
Integrator in the above-mentioned flexible Luo-coil is a passive integrator, is made up of the resistance and the electric capacity that become T shape to connect, and its circuit diagram as shown in Figure 3.
The present invention has designed the flexible Luo-coil of a kind of broadband, wide dynamic range according to the measured pulse characteristics of current, is convenient to installation and removal, and subsequent process circuit is simple and reliable.In the flexible Luo-coil shown in Figure 2; 8 for being used for protecting the heat-shrinkable T bush of a coil and an insulating effect; can buy in general chemical shop from the market; the 9th, the skeleton of flexible Luo-coil; in one embodiment of the present of invention; adopt the skeleton of silicone rubber for cable as coil, the 10th, the conductive core line of silicone rubber for cable, this moment is as the loop line of flexible Luo-coil.Flexible coil is designed to open type, and the first and last end connects by connector, uses with convenient.The connector that Luo Shi flexible coil first and last end is linked to each other can use the BNC type interface of being produced by general company of method Guoan.
The flexible Luo-coil that is used for impulse current measurement that the present invention proposes has been selected the proper supporting framework material.The lightning current measuring device is installed in the open air usually, and condition of work is more abominable, and range of temperature is bigger, so framework material should be chosen temperature characterisitic material preferably, adopts the framework material of silicon rubber as Luo-coil among the present invention.That silicon rubber has is high temperature resistant, high pressure resistant, waterproof, performance such as anticorrosion, can be operated in-60 ℃～+ 180 ℃.In one embodiment of the present of invention, adopt silicone rubber for cable, not only have good pliability, be easy to installation and removal, can also utilize the loop line of the heart yearn of cable as Luo-coil as flexible back bone.
Luo-coil of the present invention must be selected suitable coil parameter.According to the amplitude and the frequency of tested electric current, need calculate the parameter of Luo-coil, as the external diameter and the length of skeleton, the line of the coiling footpath and the number of turn etc.In one embodiment of the present of invention, be on the silicone rubber for cable of 0.1-1.0mm around external diameter directly, the heart yearn of enameled wire and cable welded together at the end of coil for the enamel covered wire of 0.1-0.5mm is evenly close with line.Heart yearn at the head end cable of coil then is connected with shielded cable as the output terminal of coil with enameled wire.In order to protect the enameled wire that is wrapped on the skeleton, can overlap the last layer heat-shrinkable T bush at the skin of coil, and suitable elastomer connector is installed to form loop at the first and last end of coil.Utilize the loop line of the heart yearn of silicone rubber for cable, can also offset of the influence of vertical coil direction magnetic field measurement result as coil; Extraneous quick variation voltage can be by mode overlapped high-frequency vibration in the output of Luo-coil of stray capacitance coupling, skin at coil can effectively reduce oscillation amplitude around the last layer Copper Foil, but should leave enough gaps between the adjacent Copper Foil, otherwise the circulation in the screen layer can weaken useful magnetic field, and Copper Foil should link to each other as signal ground with a certain output terminal of coil in addition; In order to reduce the interference of external magnetic field to signal transmission loop, transmission cable should adopt the multiple twin shielding line.
In order to obtain and the proportional waveform of tested electric current, also need the output voltage signal of Luo-coil is carried out Integral Processing.Luo-coil is operated in outer integration state among the present invention, so adopted the passive integrator that is made of resistance and electric capacity, wherein resistance must guarantee noninductively, and it is little that electric capacity then should leakage current, the temperature stability height.In order to realize integrating function, the product of resistance value R and capacitance C should be much larger than the cycle of being amassed signal.The passive integrator schematic diagram as shown in Figure 3.
Claims (5)
1. a flexible Luo-coil that is used for impulse current measurement is characterized in that this Luo-coil comprises: sleeve pipe, metal screen layer, flexible back bone, coil, conductive core line and integrator; Described sleeve pipe, metal screen layer and the flexible back bone concentric relative fixed of ecto-entad successively become annulus, are an opening in a side of annulus; Described coil is on flexible back bone, and described conductive core line is embedded in the flexible back bone, and an end of coil is connected with an end of integrator, and the other end of coil is connected with the other end of integrator by the conductive core line in the flexible back bone.
2. flexible Luo-coil as claimed in claim 1 is characterized in that wherein said sleeve pipe made by material contracting with heat.
3. flexible Luo-coil as claimed in claim 1 is characterized in that wherein said flexible back bone made by soft insulating material.
4. flexible Luo-coil as claimed in claim 1 is characterized in that wherein said flexible back bone made by silicon rubber.
5. flexible Luo-coil as claimed in claim 1 is characterized in that wherein said integrator is made up of the resistance and the electric capacity that become T shape to connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101217966A CN101122619A (en) | 2007-09-14 | 2007-09-14 | Flexible rogowski coil for impulse current measurement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101217966A CN101122619A (en) | 2007-09-14 | 2007-09-14 | Flexible rogowski coil for impulse current measurement |
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| CN101122619A true CN101122619A (en) | 2008-02-13 |
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| CNA2007101217966A Pending CN101122619A (en) | 2007-09-14 | 2007-09-14 | Flexible rogowski coil for impulse current measurement |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916674A (en) * | 2010-08-12 | 2010-12-15 | 温县供电有限责任公司 | Super insulation operating rod |
| CN102436897A (en) * | 2011-09-15 | 2012-05-02 | 西安交通大学 | Flexible Rogowski coil used for detecting direct-current system short-circuit current and method for designing same |
| CN102751081A (en) * | 2012-07-03 | 2012-10-24 | 深圳市创银科技股份有限公司 | Flexible coil current transformer and production method thereof |
| CN103116061A (en) * | 2013-01-29 | 2013-05-22 | 郑州精科电力自动化有限公司 | Novel open nonmagnetic core current sensor with compensating structure |
| CN103235169A (en) * | 2013-04-25 | 2013-08-07 | 国家电网公司 | Measuring device for pre-discharging current before insulation breakthrough at VFTO (very fast transient overvoltage) |
| CN103454597A (en) * | 2012-05-29 | 2013-12-18 | 北京嘉岳同乐极电子有限公司 | Current-induction measuring device and method and sensitivity adjusting method |
| GB2509965A (en) * | 2013-01-21 | 2014-07-23 | Cox Smith Consultants Ltd | Electrical current sensor incorporating a Rogowski coil with a narrow gap |
| CN104285152A (en) * | 2012-03-28 | 2015-01-14 | 美国亚德诺半导体公司 | Low-cost rogowski coil sensors |
| CN104459276A (en) * | 2014-11-28 | 2015-03-25 | 西安电子工程研究所 | Rogowski coil for measuring nanosecond pulse current |
| CN104569761A (en) * | 2014-12-31 | 2015-04-29 | 国家电网公司 | Live detection sensor for partial discharge of overhead cable |
| CN104820128A (en) * | 2015-06-01 | 2015-08-05 | 山东辰祥电气设备有限公司 | Semi-magnetic-core current sensor |
| CN106062570A (en) * | 2014-01-07 | 2016-10-26 | 电力电子测量有限公司 | High bandwidth rogowski transducer with screened coil |
| CN106066421A (en) * | 2016-08-12 | 2016-11-02 | 国家电网公司 | A kind of lightning arrester discharge current monitoring system and method |
| CN108008264A (en) * | 2017-12-04 | 2018-05-08 | 重庆臻远电气有限公司 | Sensor for high voltage electric equipment partial discharge monitoring |
| CN109298356A (en) * | 2018-09-20 | 2019-02-01 | 中国原子能科学研究院 | High-precision magnetic-field measurement induction coil probe in a kind of superconducting cyclotron |
| CN111064454A (en) * | 2019-12-24 | 2020-04-24 | 上海联影医疗科技有限公司 | PCB Rogowski coil, protection device and protection method of pulse forming circuit |
| CN111426980A (en) * | 2020-03-24 | 2020-07-17 | 河北为信电子科技股份有限公司 | Hand-held type electric leakage check gauge |
-
2007
- 2007-09-14 CN CNA2007101217966A patent/CN101122619A/en active Pending
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916674B (en) * | 2010-08-12 | 2012-07-04 | 温县供电有限责任公司 | Super insulation operating rod |
| CN101916674A (en) * | 2010-08-12 | 2010-12-15 | 温县供电有限责任公司 | Super insulation operating rod |
| CN102436897B (en) * | 2011-09-15 | 2014-01-29 | 西安交通大学 | Flexible Rogowski coil used for detecting direct-current system short-circuit current and method for designing same |
| CN102436897A (en) * | 2011-09-15 | 2012-05-02 | 西安交通大学 | Flexible Rogowski coil used for detecting direct-current system short-circuit current and method for designing same |
| CN104285152B (en) * | 2012-03-28 | 2017-07-18 | 美国亚德诺半导体公司 | Inexpensive rogowski belt sensor |
| CN104285152A (en) * | 2012-03-28 | 2015-01-14 | 美国亚德诺半导体公司 | Low-cost rogowski coil sensors |
| CN103454597A (en) * | 2012-05-29 | 2013-12-18 | 北京嘉岳同乐极电子有限公司 | Current-induction measuring device and method and sensitivity adjusting method |
| CN102751081A (en) * | 2012-07-03 | 2012-10-24 | 深圳市创银科技股份有限公司 | Flexible coil current transformer and production method thereof |
| GB2509965B (en) * | 2013-01-21 | 2016-05-25 | Cox-Smith Consultants Ltd | Electrical 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 |
| CN103116061A (en) * | 2013-01-29 | 2013-05-22 | 郑州精科电力自动化有限公司 | Novel open nonmagnetic core current sensor with compensating structure |
| CN103235169A (en) * | 2013-04-25 | 2013-08-07 | 国家电网公司 | Measuring device for pre-discharging current before insulation breakthrough at VFTO (very fast transient overvoltage) |
| CN106062570A (en) * | 2014-01-07 | 2016-10-26 | 电力电子测量有限公司 | High bandwidth rogowski transducer with screened coil |
| CN104459276A (en) * | 2014-11-28 | 2015-03-25 | 西安电子工程研究所 | Rogowski coil for measuring nanosecond pulse current |
| CN104569761A (en) * | 2014-12-31 | 2015-04-29 | 国家电网公司 | Live detection sensor for partial discharge of overhead cable |
| CN104820128A (en) * | 2015-06-01 | 2015-08-05 | 山东辰祥电气设备有限公司 | Semi-magnetic-core current sensor |
| CN106066421A (en) * | 2016-08-12 | 2016-11-02 | 国家电网公司 | A kind of lightning arrester discharge current monitoring system and method |
| CN108008264A (en) * | 2017-12-04 | 2018-05-08 | 重庆臻远电气有限公司 | Sensor for high voltage electric equipment partial discharge monitoring |
| CN109298356A (en) * | 2018-09-20 | 2019-02-01 | 中国原子能科学研究院 | High-precision magnetic-field measurement induction coil probe in a kind of superconducting cyclotron |
| CN111064454A (en) * | 2019-12-24 | 2020-04-24 | 上海联影医疗科技有限公司 | PCB Rogowski coil, protection device and protection method of pulse forming circuit |
| CN111064454B (en) * | 2019-12-24 | 2023-10-31 | 上海联影医疗科技股份有限公司 | Protection device and protection method for PCB (printed circuit board) Rogowski coil and pulse forming circuit |
| CN111426980A (en) * | 2020-03-24 | 2020-07-17 | 河北为信电子科技股份有限公司 | Hand-held type electric leakage check gauge |
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Open date: 20080213 |