CN102928649A - Current sensor for static synchronous compensator - Google Patents
Current sensor for static synchronous compensator Download PDFInfo
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- CN102928649A CN102928649A CN2012104482254A CN201210448225A CN102928649A CN 102928649 A CN102928649 A CN 102928649A CN 2012104482254 A CN2012104482254 A CN 2012104482254A CN 201210448225 A CN201210448225 A CN 201210448225A CN 102928649 A CN102928649 A CN 102928649A
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Abstract
The invention discloses a current sensor for a static synchronous compensator. The current sensor comprises a ring-shaped magnetic core, a primary coil, a secondary compensating coil, a Hall element, a signal amplifying circuit, a switching circuit and a measuring resistor, wherein one side of the ring-shaped magnetic core is provided with a notch, the primary coil is wound on the other side of the ring-shaped magnetic core, the secondary compensating coil is wound on the ring-shaped magnetic core on two sides of the notch, the Hall element is disposed in the notch, the signal amplifying circuit is connected with the Hall element, one end of the switching circuit is connected with the signal amplifying circuit, the other end of the switching circuit is connected with the input end of the secondary compensating coil, the junction point of one end of the measuring resistor and the output end of the secondary compensating coil is connected with a single chip of the static synchronous compensator, and the other end of the measuring resistor is earthed. The current sensor is high in detecting accuracy, response speed and overload capacity, and energy of a measured circuit does not lose.
Description
Technical field
The present invention relates to a kind of current sensor, relate in particular to a kind of current sensor for STATCOM.
Background technology
STATCOM (Static Synchronous Compensator, STATCOM) is the representative of current reactive-load compensation field state-of-the-art technology, belongs to the important component part of flexible flexible AC transmitting system.STATCOM is parallel in the electrical network, be equivalent to a controlled reactive current source, its reactive current can be followed rapidly the variation of reactive load electric current and be changed, and the required reactive power of auto-compensation network system realizes dynamic stepless compensation to power system reactive power.The STATCOM core is exactly the fast and accurately variation of follow load electric current, traditional STATCOM is to finish detection to the variation of load current by current transformer, but the accuracy of detection of current transformer is low, response speed is slow, and overload capacity is poor, can't guarantee the reliability service of STATCOM.
Summary of the invention
For above-mentioned technical matters, the object of the present invention is to provide a kind of current sensor for STATCOM, it is isolated main circuit loop and electronic control circuit when the testing circuit curent change, accuracy of detection is high, fast response time, and overload capacity is strong, does not lose the circuit-under-test energy.
For reaching this purpose, the present invention by the following technical solutions:
A kind of current sensor for STATCOM, it comprises: toroidal core, primary coil, secondary compensating coil, Hall element, signal amplification circuit, on-off circuit and measuring resistance;
One side of described toroidal core offers breach, described primary coil is wound on the opposite side of toroidal core, described secondary compensating coil is wound on the toroidal core of described breach both sides, described Hall element is arranged in the described breach, described signal amplification circuit connects Hall element, described on-off circuit one end connects signal amplification circuit, the other end connects the input end of secondary compensating coil, one end of described measuring resistance is connected the single-chip microcomputer of STATCOM, the other end ground connection of described measuring resistance with the node of the output terminal of secondary compensating coil.
Especially, described signal amplification circuit comprises resistance R 1, resistance R 2 and operational amplifier U1; One end of described resistance R 1 connects Hall element, the in the same way input end of other end concatenation operation amplifier U1, and an end of resistance R 2 connects Hall element, the reverse input end of other end concatenation operation amplifier U1, the output terminal connecting valve circuit of operational amplifier U1.
Especially, described on-off circuit comprises triode Q1 and triode Q2; The base stage of described triode Q1 is connected with the output terminal of operational amplifier U1 with the node of the base stage of triode Q2, the collector of triode Q1 connects power end+Vc, the collector of triode Q2 connects power end-Vc, and the emitter of triode Q1 is connected with the input end of secondary compensating coil with the node of the emitter of triode Q2.
The present invention inputs the magnetic field that the primary current of primary coil produces with circuit and compensates by the offset current in the secondary compensating coil in toroidal core, make Hall element be in the duty that detects zero magnetic flux, reflect accurately the variation of primary current by offset current.The present invention can measure current parameter such as direct current, interchange and the pulse waveform etc. of random waveform, also can measure the transient peak parameter, its secondary compensating coil can reflect the waveform of primary current truly, not only accuracy of detection is high, fast response time, and overload capacity is strong, does not lose the circuit-under-test energy, satisfies the fast and accurately needs of the variation of tracking circuit electric current of STATCOM.
Description of drawings
The current sensor structure figure that is used for STATCOM that Fig. 1 provides for the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the invention will be further described below in conjunction with drawings and Examples.
Please refer to shown in Figure 1, the current sensor structure figure that is used for STATCOM that Fig. 1 provides for the embodiment of the invention.
The current sensor that is used for STATCOM in the present embodiment comprises: toroidal core T, primary coil LZ, secondary compensating coil LB, Hall element HB, signal amplification circuit, on-off circuit and measuring resistance RC.
The side of described toroidal core T offers breach, described primary coil LZ is wound on the opposite side of toroidal core T, described secondary compensating coil LB is wound on the toroidal core T of described breach both sides, described Hall element HB is arranged in the described breach, described signal amplification circuit connects Hall element HB, described on-off circuit one end connects signal amplification circuit, the other end connects the input end of secondary compensating coil LB, the end of described measuring resistance RC is connected the single-chip microcomputer of STATCOM, the other end ground connection of described measuring resistance RC with the node of the output terminal of secondary compensating coil LB.
Described signal amplification circuit comprises resistance R 1, resistance R 2 and operational amplifier U1; One end of described resistance R 1 connects Hall element HB, the in the same way input end of other end concatenation operation amplifier U1, one end of resistance R 2 connects Hall element HB, the reverse input end of other end concatenation operation amplifier U1, the output terminal connecting valve circuit of operational amplifier U1.Described on-off circuit comprises triode Q1 and triode Q2; The base stage of described triode Q1 is connected with the output terminal of operational amplifier U1 with the node of the base stage of triode Q2, the collector of triode Q1 connects power end+Vc, the collector of triode Q2 connects power end-Vc, and the emitter of triode Q1 is connected with the input end of secondary compensating coil LB with the node of the emitter of triode Q2.
The course of work of the present invention is as follows: when STATCOM place major loop has a primary current to pass through, primary coil LZ produces magnetic field, be gathered in the toroidal core T ring and sense on the Hall element HB, Hall element HB generation control signal is exported to operational amplifier U1 and is amplified, thereby the triode Q1 in the driving switch circuit and triode Q2 conducting, thereby acquisition offset current, offset current produces magnetic field by secondary compensating coil LB, because this magnetic field is just in time opposite with the magnetic field that primary current produces, therefore compensated original magnetic field, thereby the output of Hall element HB is reduced gradually.When primary current equates with the product of the secondary compensating coil LB number of turn with the sum of products offset current of the primary coil LZ number of turn, the large young pathbreaker of offset current no longer increases, at this moment Hall element HB plays the effect of indication zero magnetic flux, current sensor reaches the magnetic balance state, and the single-chip microcomputer of STATCOM can detect primary current by offset current.When primary current changed, the magnetic balance state was damaged, and Hall element HB has signal output, namely repeats said process and again reaches new magnetic balance.Any variation of tested primary current all can destroy above-mentioned magnetic balance, in case magnetic field out of trim, Hall element HB just has signal output, after operational amplifier U1 amplifies, just has immediately corresponding offset current to flow through secondary compensating coil LB to compensate unbalance magnetic field.Unbalance to balance again from magnetic field, less than 1 microsecond, this is the process of a mobile equilibrium on the required time theory.
Technical scheme of the present invention can be measured current parameter such as direct current, interchange and the pulse waveform etc. of random waveform, also can measure the transient peak parameter, its secondary compensating coil can reflect the waveform of primary current truly, not only accuracy of detection is high, fast response time, and overload capacity is strong, does not lose the circuit-under-test energy, satisfies the fast and accurately needs of the variation of tracking circuit electric current of STATCOM.
Above-mentioned only is preferred embodiment of the present invention and institute's application technology principle, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses, and the variation that can expect easily or replacement all should be encompassed in protection scope of the present invention.
Claims (3)
1. a current sensor that is used for STATCOM is characterized in that, comprising: toroidal core, primary coil, secondary compensating coil, Hall element, signal amplification circuit, on-off circuit and measuring resistance;
One side of described toroidal core offers breach, described primary coil is wound on the opposite side of toroidal core, described secondary compensating coil is wound on the toroidal core of described breach both sides, described Hall element is arranged in the described breach, described signal amplification circuit connects Hall element, described on-off circuit one end connects signal amplification circuit, the other end connects the input end of secondary compensating coil, one end of described measuring resistance is connected the single-chip microcomputer of STATCOM, the other end ground connection of described measuring resistance with the node of the output terminal of secondary compensating coil.
2. the current sensor for STATCOM according to claim 1 is characterized in that, described signal amplification circuit comprises resistance R 1, resistance R 2 and operational amplifier U1; One end of described resistance R 1 connects Hall element, the in the same way input end of other end concatenation operation amplifier U1, and an end of resistance R 2 connects Hall element, the reverse input end of other end concatenation operation amplifier U1, the output terminal connecting valve circuit of operational amplifier U1.
3. the current sensor for STATCOM according to claim 1 is characterized in that, described on-off circuit comprises triode Q1 and triode Q2; The base stage of described triode Q1 is connected with the output terminal of operational amplifier U1 with the node of the base stage of triode Q2, the collector of triode Q1 connects power end+Vc, the collector of triode Q2 connects power end-Vc, and the emitter of triode Q1 is connected with the input end of secondary compensating coil with the node of the emitter of triode Q2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104482254A CN102928649A (en) | 2012-11-09 | 2012-11-09 | Current sensor for static synchronous compensator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104482254A CN102928649A (en) | 2012-11-09 | 2012-11-09 | Current sensor for static synchronous compensator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105431742A (en) * | 2013-07-24 | 2016-03-23 | 雅马哈株式会社 | Current detection circuit and magnetic detection device provided with same |
| CN108106641A (en) * | 2016-11-24 | 2018-06-01 | 英飞凌科技股份有限公司 | For operating the method for sensor and sensor |
| CN110244104A (en) * | 2019-05-09 | 2019-09-17 | 贵州电网有限责任公司 | A kind of ac current measurement circuit |
| CN114397500A (en) * | 2021-12-10 | 2022-04-26 | 西安理工大学 | Closed-loop Hall type plasma exciter service life monitoring system |
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| JP2004325352A (en) * | 2003-04-25 | 2004-11-18 | Asahi Kasei Electronics Co Ltd | Current sensor |
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| CN202057711U (en) * | 2011-04-13 | 2011-11-30 | 大连丰和电力科技有限公司 | Closed loop magnetic balance type Hall current type sensor |
| CN202256454U (en) * | 2011-10-12 | 2012-05-30 | 长沙南车电气设备有限公司 | Current sensor |
| CN202916330U (en) * | 2012-11-09 | 2013-05-01 | 无锡市锡容电力电器有限公司 | Current sensor used for static synchronous compensator |
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2012
- 2012-11-09 CN CN2012104482254A patent/CN102928649A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004325352A (en) * | 2003-04-25 | 2004-11-18 | Asahi Kasei Electronics Co Ltd | Current sensor |
| CN201732112U (en) * | 2010-06-23 | 2011-02-02 | 长沙南车电气设备有限公司 | Voltage sensor for locomotives |
| CN202057711U (en) * | 2011-04-13 | 2011-11-30 | 大连丰和电力科技有限公司 | Closed loop magnetic balance type Hall current type sensor |
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| CN202916330U (en) * | 2012-11-09 | 2013-05-01 | 无锡市锡容电力电器有限公司 | Current sensor used for static synchronous compensator |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105431742A (en) * | 2013-07-24 | 2016-03-23 | 雅马哈株式会社 | Current detection circuit and magnetic detection device provided with same |
| CN105431742B (en) * | 2013-07-24 | 2017-11-28 | 雅马哈株式会社 | Current detection circuit and the magnetic detection device equipped with the current detection circuit |
| US9841440B2 (en) | 2013-07-24 | 2017-12-12 | Yamaha Corporation | Current detection circuit and magnetic detection device provided with same |
| CN108106641A (en) * | 2016-11-24 | 2018-06-01 | 英飞凌科技股份有限公司 | For operating the method for sensor and sensor |
| CN108106641B (en) * | 2016-11-24 | 2021-03-19 | 英飞凌科技股份有限公司 | Method for operating a sensor and sensor |
| CN110244104A (en) * | 2019-05-09 | 2019-09-17 | 贵州电网有限责任公司 | A kind of ac current measurement circuit |
| CN114397500A (en) * | 2021-12-10 | 2022-04-26 | 西安理工大学 | Closed-loop Hall type plasma exciter service life monitoring system |
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Application publication date: 20130213 |