CN105842511A - Dual-coil anti-magnetic-type current transformer - Google Patents
Dual-coil anti-magnetic-type current transformer Download PDFInfo
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- CN105842511A CN105842511A CN201610188628.8A CN201610188628A CN105842511A CN 105842511 A CN105842511 A CN 105842511A CN 201610188628 A CN201610188628 A CN 201610188628A CN 105842511 A CN105842511 A CN 105842511A
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- coil
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
Abstract
The invention belongs to the technical field of electrical detection, and relates to a dual-coil anti-magnetic-type current transformer. A magnetic ring is in the form of a magnetic conductive material cylinder of a closed ring annular structure. The two ends of a primary-side coil are connected with a to-be-measured end respectively. A compensation coil and the primary-side coil are opposite in winding direction, and the winding diameter of the compensation coil is larger than the winding diameter of the primary-side coil. An amplifier drive coil and the primary-side coil are the same in winding direction. The coil diameter of the amplifier drive coil is larger than the coil diameter of the primary-side coil. The input ends of an operational amplifier are respectively connected with the two ends of the amplifier drive coil via a first resistor and a second resistor. The output ends of the operational amplifier are respectively connected with the two ends of the compensation coil via the docked collectors of a first triode and a second triode. The parameters of the first triode and the second triode are symmetrical. The dual-coil anti-magnetic-type current transformer is simple in structure, low in cost, efficient, anti-magnetic, good in linearity, high in precision, good in dynamic performance, high in accuracy, easy in production, and environment-friendly.
Description
Technical field:
The invention belongs to electrical detection technical field, relate to a kind of twin coil anti-magnetic-type Current Mutual Inductance
Device, particularly a kind of employing coil windings sensing measured signal change, utilize bucking coil to eliminate
The anti-magnetic current transducers of height of magnetic disturbance.
Background technology:
Along with urban population and the expansion of construction scale, increasing of various electrical equipments, electricity consumption
What environment became becomes increasingly complex；People in daily life, frequently suffer from power supply and power system
The invasion of failure problems, therefore, detection and the detection requirement automatically of power system are more come by society
The highest.Power system, in order to transmit electric energy, often uses alternating voltage, big current loop electricity
Power is sent in custom power system, it is impossible to directly measure by instrument, and the effect of transformer
It is exactly alternating voltage and big electric current to drop to use instrument numerical value measured directly in proportion, just
Directly measure in instrument, provide power supply for relay protection and automaton simultaneously.In prior art
In, closed loop Hall current transformer is the one in conventional transformer, and it utilizes Hall element sense
Answer the magnetic field that primary current produces at magnetism gathering rings, and the magnetic field produced by bucking coil electric current
Compensating, it compensates electric current and reflects primary current accurately, so that Hall element is in inspection
Survey the duty of Zero flux；Hall element coordinates with relay protection and automaton, can be with structure
The in pairs electic protection of the various fault of electrical network and automatically controlling；But Hall element needs to be arranged on
In magnet ring air gap, manufacturing process is relative complex, also expends substantial amounts of hall device, causes electronics
Goods, materials and equipments is wasted.Therefore, seek to design a kind of twin coil anti-magnetic-type current transformer and have very much application valency
Value, it uses coil windings to replace Hall element sensing measured signal, simple in construction, cost
Low, high antimagnetic effect can be played.
Summary of the invention:
It is an object of the invention to the shortcoming overcoming prior art to exist, design proposes a kind of two-wire
Enclose anti-magnetic-type current transformer, to solve tested power system cannot be directly accessed measuring instrument
Problem, solve the problem disturbed by magnetic signal during the signal of telecommunication detects automatically, and electronics unit device
The waste problem of the goods, materials and equipments such as part, plays the effect of high-efficiency anti-magnetic, and reduces Financial cost.
In order to realize foregoing invention purpose, the twin coil anti-magnetic-type Current Mutual Inductance that the present invention relates to
Device, its agent structure includes: magnet ring, primary coil, bucking coil, amplifier drive line
Circle, operational amplifier, the first audion, the second audion, the first resistor, the second resistance
Device and tested end；Magnet ring is the magnetic conduction substance cylinder of closed ring structure, and primary coil uses absolutely
Edge wire is wound around the multiturn coil of the densely covered structure that magnet ring is formed, and the two ends of primary coil are with tested
End is respectively connected with；Bucking coil is the multiturn coil that insulated conductor is wound around that magnet ring is formed, and compensates
Contrary with the direction of winding of primary coil and bucking coil the winding diameter of coil is more than primary coil
Winding diameter；Amplifier drives coil to be the multiturn coil that insulated conductor is wound around that magnet ring is formed,
Amplifier drives coil identical with the direction of winding of primary coil；Amplifier drives the coil of coil
Diameter is more than the coil diameter of primary coil；The amplification of operational amplifier is more than 50
Conventional amplifier circuit unit, it is possible to input signal is added, subtract, differential and integration mathematics
Output signal again after computing, the input of operational amplifier is respectively by the first resistor and second
Resistor is connected on amplifier and drives the two ends of coil, and the outfan of operational amplifier passes through the one or three
Colelctor electrode after pole pipe and the docking of the second audion is connected on the two ends of bucking coil respectively；Through electricity
Road processes, and the outfan of current transformer can export the compensation electricity accurately reflecting tested electric current
Stream, and access the external device measuring electric current；The first resistor and second that the present embodiment relates to
Common electric resistance structure selected by resistor, and its resistance is 0.5-3 Κ Ω；First audion and
Two audions are same model crystal triode, and the parameter of the two is symmetrical.
The operation principle of the present embodiment is: when the tested two ends terminating at primary coil, tested electricity
When stream flows through primary coil, magnetic field, generation former limit around primary coil, magnetic field, former limit big
The little size of current to primary coil is directly proportional, and magnetic field, former limit is assembled by magnet ring and senses amplification
Device drives on coil, and amplifier drives weak current or voltage output signal produced by coil to drive
Dynamic operational amplifier also turns it on, and drives operational amplifier by faint curtage output
Signal obtains after amplifying and amplifies voltage, amplifies voltage and is added in the two ends of bucking coil, then exists
Bucking coil produces one and compensates electric current, compensate electric current and compensate magnetic by bucking coil generation again
, the former limit magnetic direction that this compensation magnetic field produces with tested electric current is contrary, thus counteract by
Survey the magnetic field, former limit that electric current produces, make amplifier drive weak current or the voltage letter of coil output
Number it is gradually reduced, when compensating magnetic field and being equal with magnetic field, former limit, compensates electric current and be not further added by, benefit
Repaying magnetic field also will not increase accordingly, magnetic circuit reaches magnetic balance state；When tested curent change,
Balance is destroyed, and amplifier drives coil to have weak voltage or current signal output, i.e. repeats
Said process reaches balance again, unbalance to again balancing from magnetic field, forms a dynamic equilibrium
Process, in this process, will compensate between size of current and the number of turn of bucking coil and carry out
Proper Match, makes compensation magnetic field close with magnetic field, former limit size, and both reach zero after cancelling out each other
Magnetic field, thus realize the function of high-efficiency anti-magnetic.
The present invention compared with prior art, uses coil windings sensing measured signal, structure letter
Single, low cost；High-efficiency anti-magnetic, the linearity is good, and precision is high, has good dynamic property；Its
Scientific in principle is reliable, and accuracy is strong, manufactures simplicity, it is easy to produce, and applied environment is friendly.
Accompanying drawing illustrates:
Fig. 1 is the structural principle schematic diagram of the present invention.
Detailed description of the invention:
Below by specific embodiment and combine accompanying drawing the invention will be further described.
Embodiment:
The agent structure of the twin coil anti-magnetic-type current transformer that the present embodiment relates to includes: magnet ring
1, primary coil 2, bucking coil 3, amplifier drive coil 4, operational amplifier 5, the
One audion the 6, second audion the 7, first resistor the 8, second resistor 9 and tested end
10；Magnet ring 1 is the magnetic conduction substance cylinder of closed ring structure, and primary coil 2 uses insulation to lead
Line is wound around the multiturn coil of the densely covered structure that magnet ring 1 is formed, and the two ends of primary coil 2 are with tested
End 10 is respectively connected with；Bucking coil 3 is wound around, for insulated conductor, the multiturn line that magnet ring 1 is formed
Circle, contrary with the direction of winding of primary coil 2 and bucking coil 3 the coiling of bucking coil 3 is straight
Footpath is more than the winding diameter of primary coil 2；Amplifier drives coil 4 to be wound around magnetic for insulated conductor
The multiturn coil that ring 1 is formed, amplifier drives the direction of winding phase of coil 4 and primary coil 2
With；Amplifier drives the coil diameter coil diameter more than primary coil 2 of coil 4；Computing
The amplification of amplifier 5 is the conventional amplifier circuit unit more than 50, it is possible to input
Signal carries out adding, subtracts, output signal, operational amplifier 5 again after differential and integration mathematical operation
Input be connected on amplifier by the first resistor 8 and the second resistor 9 respectively and drive coil
The two ends of 4, the outfan of operational amplifier 5 passes through the first audion 6 and the second audion 7
Colelctor electrode after docking is connected on the two ends of bucking coil 3 respectively；Through processing of circuit, electric current is mutual
The outfan of sensor can export the compensation electric current accurately reflecting tested electric current, and accesses measurement electricity
The external device of stream；The first resistor 8 and the second resistor 9 that the present embodiment relates to are selected general
Logical electric resistance structure, its resistance is 0.5-3 Κ Ω；First audion 6 and the second audion 7
For same model crystal triode, the parameter of the two is symmetrical.
The operation principle of the present embodiment is: when tested end 10 is connected on the two ends of primary coil 2,
When tested electric current flows through primary coil 2, around primary coil 2, magnetic field, generation former limit, former
The size in magnetic field, limit is directly proportional to the size of current of primary coil 2, and magnetic field, former limit is gathered by magnet ring 1
Collecting and sense that amplifier drives on coil 4, amplifier drives faint electricity produced by coil 4
Stream or voltage output signal drive operational amplifier 5 and turn it on, and drive operational amplifier 5
Obtain after faint curtage output signal is amplified and amplify voltage, amplify voltage and be added in
The two ends of bucking coil 3, then produce one in bucking coil 3 and compensate electric current, compensate electricity
Stream is produced by bucking coil 3 and compensates magnetic field, and this compensation magnetic field is former with what tested electric current produced
Limit magnetic direction is contrary, thus counteracts the magnetic field, former limit that tested electric current produces, and makes amplifier drive
Weak current or the voltage signal of moving winding 4 output are gradually reduced, when compensating magnetic field and former limit magnetic
When field is equal, compensating electric current and be not further added by, compensating magnetic field also will not increase accordingly, and magnetic circuit reaches
Magnetic balance state；When tested curent change, balance is destroyed, and amplifier drives coil 4
There are weak voltage or current signal output, i.e. repeat said process and again reach balance, from magnetic field
Unbalance to again balancing, form the process of a dynamic equilibrium, in this process, will compensate
Carry out Proper Match between the number of turn of size of current and bucking coil 3, make compensation magnetic field and former limit
Magnetic field size is close, and both reach zero magnetic field after cancelling out each other, thus realize the merit of high-efficiency anti-magnetic
Energy.
Claims (1)
1. a twin coil anti-magnetic-type current transformer, it is characterised in that agent structure includes magnetic
Ring, primary coil, bucking coil, amplifier drive coil, operational amplifier, the one or three
Pole pipe, the second audion, the first resistor, the second resistor and tested end；Magnet ring is envelope
The magnetic conduction substance cylinder of closed-loop shaped structure, primary coil uses insulated conductor to be wound around magnet ring and is formed
The multiturn coil of densely covered structure, the two ends of primary coil are respectively connected with tested end；Mend
Repaying coil is the multiturn coil that insulated conductor is wound around that magnet ring is formed, bucking coil and primary coil
Direction of winding is contrary and the winding diameter of bucking coil is more than the winding diameter of primary coil；
Amplifier drives coil to be the multiturn coil that insulated conductor is wound around that magnet ring is formed, and amplifier drives
Coil is identical with the direction of winding of primary coil；Amplifier drives the coil diameter of coil to be more than
The coil diameter of primary coil；The amplification of operational amplifier is the conventional amplification more than 50
Device circuit unit, it is possible to input signal is added, subtract, after differential and integration mathematical operation
Output signal again, the input of operational amplifier is respectively by the first resistor and the second resistance
Device is connected on amplifier and drives the two ends of coil, and the outfan of operational amplifier passes through the one or three pole
Colelctor electrode after pipe and the docking of the second audion is connected on the two ends of bucking coil respectively；Through electricity
Road processes, and the outfan of current transformer can export the compensation electricity accurately reflecting tested electric current
Stream, and access the external device measuring electric current；First resistor and the second resistor are selected general
Logical electric resistance structure, its resistance is 0.5-3 Κ Ω；First audion and the second audion are same
Model crystal triode, the parameter of the two is symmetrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610188628.8A CN105842511A (en) | 2016-03-30 | 2016-03-30 | Dual-coil anti-magnetic-type current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610188628.8A CN105842511A (en) | 2016-03-30 | 2016-03-30 | Dual-coil anti-magnetic-type current transformer |
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| Publication Number | Publication Date |
|---|---|
| CN105842511A true CN105842511A (en) | 2016-08-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610188628.8A Pending CN105842511A (en) | 2016-03-30 | 2016-03-30 | Dual-coil anti-magnetic-type current transformer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443125A (en) * | 2016-09-05 | 2017-02-22 | 西安交通大学 | Dual-wire magnetic field cancellation-based zero-flux high-current detection method |
| CN106908635A (en) * | 2017-02-23 | 2017-06-30 | 国网天津节能服务有限公司 | A kind of current transformer based on Active Compensation external magnetic field |
| CN107356800A (en) * | 2017-07-04 | 2017-11-17 | 西安交通大学 | The high-current detector and method of a kind of magnetic field cancellation |
| CN110361785A (en) * | 2019-06-21 | 2019-10-22 | 中国科学院地质与地球物理研究所 | A kind of aviation transient electromagnetic method reception compensation device |
| CN111856192A (en) * | 2020-07-31 | 2020-10-30 | 深圳市德恒科技有限公司 | No load check out test set |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0825449A1 (en) * | 1996-08-19 | 1998-02-25 | Siemens Aktiengesellschaft | Current measuring method and device |
| CN1417814A (en) * | 2002-12-18 | 2003-05-14 | 国电南京自动化股份有限公司 | Compensation method of current sensor and zero-flux microcurrent sensor |
| CN202256454U (en) * | 2011-10-12 | 2012-05-30 | 长沙南车电气设备有限公司 | Current sensor |
| CN203259575U (en) * | 2013-04-24 | 2013-10-30 | 四川海天仪表电器开发有限公司 | Closed-loop current sensor |
| CN103616550A (en) * | 2013-11-29 | 2014-03-05 | 河北工业大学 | Giant magnetoresistance current sensor |
-
2016
- 2016-03-30 CN CN201610188628.8A patent/CN105842511A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0825449A1 (en) * | 1996-08-19 | 1998-02-25 | Siemens Aktiengesellschaft | Current measuring method and device |
| CN1417814A (en) * | 2002-12-18 | 2003-05-14 | 国电南京自动化股份有限公司 | Compensation method of current sensor and zero-flux microcurrent sensor |
| CN202256454U (en) * | 2011-10-12 | 2012-05-30 | 长沙南车电气设备有限公司 | Current sensor |
| CN203259575U (en) * | 2013-04-24 | 2013-10-30 | 四川海天仪表电器开发有限公司 | Closed-loop current sensor |
| CN103616550A (en) * | 2013-11-29 | 2014-03-05 | 河北工业大学 | Giant magnetoresistance current sensor |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443125A (en) * | 2016-09-05 | 2017-02-22 | 西安交通大学 | Dual-wire magnetic field cancellation-based zero-flux high-current detection method |
| CN106443125B (en) * | 2016-09-05 | 2019-02-05 | 西安交通大学 | A kind of Zero flux checking of great current method based on two-conductor line magnetic field cancellation |
| CN106908635A (en) * | 2017-02-23 | 2017-06-30 | 国网天津节能服务有限公司 | A kind of current transformer based on Active Compensation external magnetic field |
| CN107356800A (en) * | 2017-07-04 | 2017-11-17 | 西安交通大学 | The high-current detector and method of a kind of magnetic field cancellation |
| CN110361785A (en) * | 2019-06-21 | 2019-10-22 | 中国科学院地质与地球物理研究所 | A kind of aviation transient electromagnetic method reception compensation device |
| CN111856192A (en) * | 2020-07-31 | 2020-10-30 | 深圳市德恒科技有限公司 | No load check out test set |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160810 |
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| RJ01 | Rejection of invention patent application after publication |