CN101000363A - Electronic veltage transformer of capacitor or resistance series hollow coil - Google Patents
Electronic veltage transformer of capacitor or resistance series hollow coil Download PDFInfo
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- CN101000363A CN101000363A CN 200610136824 CN200610136824A CN101000363A CN 101000363 A CN101000363 A CN 101000363A CN 200610136824 CN200610136824 CN 200610136824 CN 200610136824 A CN200610136824 A CN 200610136824A CN 101000363 A CN101000363 A CN 101000363A
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Abstract
An electronic voltage transformer with capacity or resistance being series-connected to hollow coil is prepared as forming primary coil by hollow coil, series-connecting capacity or resistance in primary coil and connecting output end of secondary coil to induction voltage signal processing circuit.
Description
Technical field
The present invention relates to a kind of voltage transformer (VT), especially relate to a kind of electric capacity of the various electric pressure voltage measurements of electric system or electronic type voltage transformer of resistance serial connection air core coil of being used for.
Background technology
Existing voltage transformer (VT) mainly is electromagnetic potential transformer and capacitance type potential transformer.Comparatively advanced optical voltage transformer (OVT) has also appearred both at home and abroad in recent years and based on the electric capacity of electric capacity or electric resistance partial pressure or the electronic type voltage transformer of resistance serial connection air core coil.
The electromagnetic potential transformer insulation system is increasingly sophisticated, large body and heavy mass, and ferroresonance may take place in the cost height, and is low to the small-signal measuring accuracy.And capacitance type potential transformer is owing to have intermediate transformer and compensation reactor, and its transient response is poor, and ferroresonance easily takes place, and threatens the safe operation of equipment.
The ultimate principle of optical voltage transformer is to utilize the physical influence of optical material, carries out voltage measurement as bubble Ke Ersi (Pockels) effect, electric light Ke Er (Kerr) effect and inverse piezoelectric effect etc.But because optical material is subjected to the influence of factors such as temperature, mechanical vibration bigger, though the trial run of domestic existing procucts linked network, stability, reliability are not high, and cost an arm and a leg, also have many key issues such as phase angle measurement not to be resolved, therefore fail to form product and use in electric system.
Sensing principle based on the electronic type voltage transformer of the electric capacity of electric capacity or electric resistance partial pressure or resistance serial connection air core coil is based on electric capacity or electric resistance partial pressure principle, tested high pressure directly is added on high-voltage arm electric capacity or the resistance, tells the small voltage that is directly proportional with a sub-high pressure on low-voltage arm.The defective of the electronic type voltage transformer of this electric capacity or resistance serial connection air core coil is to be subject to Temperature Influence, especially secondary side voltage and primary side high voltage directly are coupled, and do not have electrical isolation, are subject to disturb, and there is potential safety hazard, may causes device damage and personal safety accident.
Summary of the invention
For solving the existing technical matters of above-mentioned voltage transformer (VT), the invention provides the electronic type voltage transformer of a kind of volume is little, in light weight, cost is low, antijamming capability is strong, measuring accuracy is high electric capacity or resistance serial connection air core coil.
The technical scheme that the present invention solves the problems of the technologies described above is: comprise primary winding, secondary coil, resistance is connected with the primary winding of air core coil and is constituted the primary side of voltage sensor, and the secondary coil of air core coil is as the output terminal of voltage sensor.
In the electronic type voltage transformer of above-mentioned electric capacity or resistance serial connection air core coil, also comprise the induced voltage signal treatment circuit, the induced voltage signal treatment circuit comprises differential amplifier circuit, feedback amplifier, differential amplifier circuit is connected with feedback amplifier, the output terminal of the input termination secondary coil of differential amplifier circuit, feedback amplifier adopt with the resistance of primary circuit resistance identical characteristics and do feedback resistance.
In the electronic type voltage transformer of above-mentioned electric capacity or resistance serial connection air core coil, described feedback amplifier is the proportional amplifier that operational amplifier constitutes.
The electronic type voltage transformer of a kind of electric capacity or resistance serial connection air core coil, comprise primary winding, secondary coil, electric capacity is connected with a lead of air core coil and is constituted the primary side of voltage sensor, and the secondary coil of air core coil is as the output terminal of voltage sensor.
In the electronic type voltage transformer of above-mentioned electric capacity or resistance serial connection air core coil, also comprise the induced voltage signal treatment circuit, the induced voltage signal treatment circuit comprises differential amplifier circuit, integrating circuit, differential amplifier circuit is connected with integrating circuit, the output terminal of the input termination secondary coil of differential amplifier circuit, integrating circuit adopts the electric capacity with primary circuit electric capacity identical characteristics.
In the electronic type voltage transformer of above-mentioned electric capacity or resistance serial connection air core coil, described integrating circuit is made of operational amplifier.
Technique effect of the present invention: 1) primary winding, the secondary coil iron core that is not coupled, saturated phenomenon can not appear, and its linearity height, transient characterisitics are good, have improved measuring accuracy; 2) secondary side of voltage transformer (VT) and primary side have been realized electrical isolation, and adopt perfect anti-electromagnetic interference capability measure, have improved reliability and antijamming capability; 3) provide the temperature-compensation circuit of primary side electric capacity, resistance; 4) dynamic range is big, and the voltage signal of output can link to each other with microsystem easily, is easy to realize the needs of Power System Intelligentization and network management; 5) volume is little, in light weight, cost is low, safe, the secondary output short-circuit can not damage mutual inductor.
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Description of drawings
The structure principle chart of the voltage transformer (VT) of the capacitance series air core coil that Fig. 1 uses for mesohigh of the present invention.
The resistance that Fig. 2 uses for mesohigh of the present invention is connected in series the structure principle chart of the voltage transformer (VT) of air core coil.
The schematic diagram of the voltage transformer (VT) of the capacitance series air core coil that Fig. 3 uses for low pressure of the present invention.
Fig. 4 is example structure Fig. 1 of induced voltage signal treatment circuit among the present invention.
Fig. 5 is example structure Fig. 2 of induced voltage signal treatment circuit among the present invention.
Fig. 6 is an example structure figure of hollow core coil of the present invention.
Fig. 7 is the sectional view of another embodiment of hollow core coil of the present invention.
Fig. 8 is the structural drawing of secondary coil in Fig. 7 hollow core coil.
Embodiment
Referring to Fig. 1, be used for the mesohigh voltage transformer (VT), 1 is high-voltage connection, directly is connected to high voltage bus end; The primary winding of hollow coil current-sensing device 2 and accurate electric capacity 3 polyphones, the primary side of formation voltage sensor, the secondary coil of hollow coil current-sensing device 2 is as the output terminal of voltage sensor; Voltage sensor also is provided with inner insulating layer, screen layer, external insulation layer successively.Produce a primary current that is directly proportional and changes with tested primary voltage in the primary circuit, primary side by air core coil 2, the secondary induction voltage signal of one of its secondary coil induction and the proportional variation of primary current promptly reflects the variation of primary measured voltage proportionally.Same principle, the voltage transformer (VT) of resistance serial connection air core coil, referring to Fig. 2, wherein 4 is precision resistance.
In the foregoing description, voltage sensor and induced voltage signal treatment circuit can be concentrated and be produced in the device, also can separately make.
The principle of above-mentioned voltage sensor can also be used for the voltage sensor with the various Microcomputer Protections, measure and control device and the electronic electric energy meter meter that have conventional electromagnetic type and capacitance type potential transformer interface now.Referring to Fig. 3, be used for the voltage transformer (VT) of the capacitance series air core coil of rated voltage 100V, 220V and 380V, U
1Be the tested voltage of input, constitute the primary circuit of voltage transformer (VT) through the Primary Conductor of accurate electric capacity 9 and hollow coil current-sensing device 10, secondary coil 10 is as the secondary side of voltage transformer (VT), induction output secondary voltage U
2, as the input signal of treatment circuit.Electric capacity 9 among Fig. 3 can be substituted by precision resistance, constitutes the voltage transformer (VT) of resistance serial connection air core coil.The voltage transformer (VT) that these two kinds of low pressure are used is convenient to various Microcomputer Protections, measure and control device and electronic electric energy meter meter integrated; has very high measuring accuracy; and realized the electrical isolation of secondary induction voltage signal and primary voltage, improved the antijamming capability and the reliability of system.
Fig. 4 is the induced signal treatment circuit of the voltage transformer (VT) of capacitance series air core coil, and the induced signal of voltage sensor secondary side is earlier through differential amplifier; Pass through integrating circuit again, wherein R
0Be precision resister, capacitor C has identical temperature coefficient with the accurate electric capacity of voltage sensor primary side, and primary side electric capacity is carried out temperature compensation.
Equally, induced signal treatment circuit in the voltage transformer (VT) of resistance serial connection air core coil, referring to Fig. 5, comprise differential amplifier circuit, feedback amplifier, differential amplifier circuit is connected with feedback amplifier, the output terminal of the input termination voltage sensor of differential amplifier circuit, feedback amplifier adopt with the resistance R _ f of primary circuit resistance identical characteristics and do feedback resistance, and primary side resistance is carried out temperature compensation.
Referring to Fig. 6, Fig. 6 by among the present invention the structural representation of employing coil.12 is secondary spiral pipe sensing coil, 11 for offsetting the second compensation spiral hollow coil that external magnetic field disturbs, both evenly closely turn to the identical spiral pipe of length by identical enamel-cover thin copper wire, every layer coil turn is identical, and both coils around to identical, there are one deck air core coil head end or terminal linking to each other on the spiral 11, three layers of air core coil are arranged on 12.13 is a toroidal winding, tightly turns to spiral pipe around spiral pipe sensing coil 12, makes the secondary sensing coil primary winding that can be coupled more consumingly, is convenient to the raising of coefficient of mutual inductance or reduces; 15,16 is the secondary induction voltage output terminal.The sectional area of spiral pipe 11 is three times of spiral pipe 12 sectional areas, and both totally one central shafts.Make the coil number of plies of two spiral hollow coils equate like this with the product of spiral pipe sectional area, thereby the induction electromotive force equal and opposite in direction, the direction that make external interference magnetic field produce in these two spiral hollow coils are opposite, connect by 14, cancel out each other, avoid the interference of external electromagnetic, guaranteed the precision of measuring.This air core coil is used for Fig. 1, Fig. 2, in the primary winding 13 of air core coil can by with the electric current of the proportional variation of tested voltage, its secondary side induction produces a voltage signal with the proportional variation of tested voltage, exports from 15,16 ends.
Among Fig. 7,17,18,19,20 are the identical spiral pipe sensing coil that is wound with secondary coil, and closely are evenly distributed on the circle around a center, and the space of being stayed is each other passed through for Primary Conductor 21.Primary Conductor 21 is made the spiral pipe primary winding of a circle or multiturn around the non-conterminous secondary spiral pipe of above-mentioned half sensing coil.Wherein too tight during a toroidal winding coiled multiturn, consider a spiral pipe heat radiation and with the insulation of secondary spiral pipe.In conjunction with Fig. 8, adjacent spiral pipe secondary coil is head end or terminal linking to each other successively, and 22,23 is whole secondary toroidal winding head and the tail lead end, as the output terminal of secondary induced signal.When feeding tested alternating current in the Primary Conductor, the induction electromotive force direction that 17,18,19,20 secondary coil produces is all identical, the serial connection mutual superposition, and total induction electromotive force is from 22,23 outputs.According to the needs of practical application, air core coil also can other version.
Claims (6)
1, the electronic type voltage transformer of a kind of electric capacity or resistance serial connection air core coil, it is characterized in that: comprise primary winding, secondary coil, resistance is connected with the primary winding of air core coil and is constituted the primary side of voltage sensor, and the secondary coil of air core coil is as the output terminal of voltage sensor.
2, the electronic type voltage transformer of electric capacity according to claim 1 or resistance serial connection air core coil, it is characterized in that: also comprise the induced voltage signal treatment circuit, the induced voltage signal treatment circuit comprises differential amplifier circuit, feedback amplifier, differential amplifier circuit is connected with feedback amplifier, the output terminal of the input termination secondary coil of differential amplifier circuit, feedback amplifier adopt with the resistance of primary circuit resistance identical characteristics and do feedback resistance.
3, the electronic type voltage transformer of electric capacity according to claim 2 or resistance serial connection air core coil is characterized in that: described feedback amplifier is the proportional amplifier that operational amplifier constitutes.
4, the electronic type voltage transformer of the electric capacity of a kind of electric capacity or resistance serial connection air core coil or resistance serial connection air core coil, it is characterized in that: comprise primary winding, secondary coil, electric capacity is connected with a lead of air core coil and is constituted the primary side of voltage transformer (VT), and the secondary coil of air core coil is as the output terminal of voltage sensor.
5, the electronic type voltage transformer of electric capacity according to claim 4 or resistance serial connection air core coil, it is characterized in that: also comprise the induced voltage signal treatment circuit, the induced voltage signal treatment circuit comprises differential amplifier circuit, integrating circuit, differential amplifier circuit is connected with integrating circuit, the output terminal of the input termination secondary coil of differential amplifier circuit, integrating capacitor adopts the electric capacity with primary circuit electric capacity identical characteristics.
6, the electronic type voltage transformer of electric capacity according to claim 5 or resistance serial connection air core coil, it is characterized in that: described integrating circuit is made of operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610136824A CN100578233C (en) | 2006-12-08 | 2006-12-08 | Electronic veltage transformer of capacitor or resistance series hollow coil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610136824A CN100578233C (en) | 2006-12-08 | 2006-12-08 | Electronic veltage transformer of capacitor or resistance series hollow coil |
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| CN101000363A true CN101000363A (en) | 2007-07-18 |
| CN100578233C CN100578233C (en) | 2010-01-06 |
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| CN200610136824A Expired - Fee Related CN100578233C (en) | 2006-12-08 | 2006-12-08 | Electronic veltage transformer of capacitor or resistance series hollow coil |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916648A (en) * | 2010-08-23 | 2010-12-15 | 山东电力研究院 | Digital type linear alternating voltage transformer of multi-frequency range measurement and measuring method thereof |
| CN102305885A (en) * | 2010-10-26 | 2012-01-04 | 江苏多维科技有限公司 | Isolation type voltage sensor |
| CN102539888A (en) * | 2012-01-18 | 2012-07-04 | 周有庆 | Direct measurement capacitance-current primary voltage sensor |
| CN104345196A (en) * | 2014-10-30 | 2015-02-11 | 南京信息工程大学 | Active weak power frequency current induction coil |
| CN106771423A (en) * | 2016-11-29 | 2017-05-31 | 国家电网公司 | A kind of temperature compensation and device of electronic type capacitance partial pressure transformer |
| CN108761164A (en) * | 2018-04-19 | 2018-11-06 | 江苏大学 | A kind of hollow difference coil and its measurement method for impulse current measurement |
| CN108896846A (en) * | 2018-06-01 | 2018-11-27 | 中国人民解放军海军工程大学 | It can measure the apparatus and method of high-voltage system Conduction Interference |
| CN117330813A (en) * | 2023-09-27 | 2024-01-02 | 苏州万龙电气集团股份有限公司 | Hollow current measurement method, hybrid current transformer and circuit breaker |
-
2006
- 2006-12-08 CN CN200610136824A patent/CN100578233C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916648A (en) * | 2010-08-23 | 2010-12-15 | 山东电力研究院 | Digital type linear alternating voltage transformer of multi-frequency range measurement and measuring method thereof |
| CN101916648B (en) * | 2010-08-23 | 2011-11-09 | 山东电力研究院 | Digital type linear alternating voltage transformer of multi-frequency range measurement and measuring method thereof |
| CN102305885A (en) * | 2010-10-26 | 2012-01-04 | 江苏多维科技有限公司 | Isolation type voltage sensor |
| WO2012055357A1 (en) * | 2010-10-26 | 2012-05-03 | 江苏多维科技有限公司 | Isolated voltage sensor and isolated voltage sensor using mtj device |
| CN102539888A (en) * | 2012-01-18 | 2012-07-04 | 周有庆 | Direct measurement capacitance-current primary voltage sensor |
| CN104345196A (en) * | 2014-10-30 | 2015-02-11 | 南京信息工程大学 | Active weak power frequency current induction coil |
| CN106771423A (en) * | 2016-11-29 | 2017-05-31 | 国家电网公司 | A kind of temperature compensation and device of electronic type capacitance partial pressure transformer |
| CN106771423B (en) * | 2016-11-29 | 2024-03-15 | 国家电网有限公司 | Temperature compensation method and device for electronic capacitive voltage-dividing transformer |
| CN108761164A (en) * | 2018-04-19 | 2018-11-06 | 江苏大学 | A kind of hollow difference coil and its measurement method for impulse current measurement |
| CN108896846A (en) * | 2018-06-01 | 2018-11-27 | 中国人民解放军海军工程大学 | It can measure the apparatus and method of high-voltage system Conduction Interference |
| CN108896846B (en) * | 2018-06-01 | 2020-11-13 | 中国人民解放军海军工程大学 | Device and method for measuring conducted interference of high-voltage system |
| CN117330813A (en) * | 2023-09-27 | 2024-01-02 | 苏州万龙电气集团股份有限公司 | Hollow current measurement method, hybrid current transformer and circuit breaker |
| CN117330813B (en) * | 2023-09-27 | 2024-05-14 | 上海磊跃自动化设备有限公司 | Hollow current measurement method, hybrid current transformer and circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100578233C (en) | 2010-01-06 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB02 | Change of applicant information |
Inventor after: Zhou Youqing Inventor after: Li Feng Inventor before: Zhou Youqing Inventor before: Gong Wei |
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| CB03 | Change of inventor or designer information | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161222 Address after: 414413 Hunan Miluo circular economy industrial park, south of dragon boat Road, No. 1 Patentee after: MILUO TONGBIAN ELECTRIC CO., LTD. Address before: 410013 Hunan province Changsha City Lugu high tech Zone Software Park 407 Patentee before: Changsha Tongqing Electric Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100106 Termination date: 20181208 |
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| CF01 | Termination of patent right due to non-payment of annual fee |