CN202916330U - Current sensor used for static synchronous compensator - Google Patents
Current sensor used for static synchronous compensator Download PDFInfo
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- CN202916330U CN202916330U CN 201220589980 CN201220589980U CN202916330U CN 202916330 U CN202916330 U CN 202916330U CN 201220589980 CN201220589980 CN 201220589980 CN 201220589980 U CN201220589980 U CN 201220589980U CN 202916330 U CN202916330 U CN 202916330U
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- triode
- hall element
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- signal amplification
- statcom
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Abstract
The utility model discloses a current sensor used for a static synchronous compensator (STATCOM), comprising a circular magnetic core, a primary side coil, a secondary compensation coil, a Hall element, a signal amplification circuit, a switch circuit and a measuring resistor. One side of the circular magnetic core is provided with a notch; the primary side coil winds the other side of the circular magnetic core; the secondary compensation coil winds the circular magnetic core on two sides of the notch; the Hall element is arranged in the notch; the signal amplification circuit is in connection with the Hall element; one end of the switch circuit is in connection with the signal amplification circuit and the other end is in connection with an input terminal of the secondary compensation coil; a node of one end of the measuring resistor and an output terminal of the secondary compensation coil is in connection with a singlechip of a static synchronous compensator; the other end of the measuring resistor is grounding. The current sensor used for a static synchronous compensator has high detection precision, fast response speed and strong overload capability and does not lose energy of a circuit to be detected.
Description
Technical field
The utility model relates to a kind of current sensor, relates 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.
The utility model content
For above-mentioned technical matters, the purpose of this utility model 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 utility model 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 utility model is inputted the magnetic field that the primary current of primary coil produces with circuit and is compensated 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 utility model 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.
Description of drawings
The current sensor structure figure that is used for STATCOM that Fig. 1 provides for the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, the utility model is described in further detail 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 utility model embodiment.
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 utility model course of work 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.
The technical solution of the utility model 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 utility model and institute's application technology principle; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed in the protection domain of the present utility model.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220589980 CN202916330U (en) | 2012-11-09 | 2012-11-09 | Current sensor used for static synchronous compensator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220589980 CN202916330U (en) | 2012-11-09 | 2012-11-09 | Current sensor used for static synchronous compensator |
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| Publication Number | Publication Date |
|---|---|
| CN202916330U true CN202916330U (en) | 2013-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220589980 Expired - Lifetime CN202916330U (en) | 2012-11-09 | 2012-11-09 | Current sensor used for static synchronous compensator |
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| CN (1) | CN202916330U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928649A (en) * | 2012-11-09 | 2013-02-13 | 无锡市锡容电力电器有限公司 | Current sensor for static synchronous compensator |
| CN105572438A (en) * | 2016-03-21 | 2016-05-11 | 山东交通学院 | Current sensor processing technology |
| CN110542788A (en) * | 2019-09-23 | 2019-12-06 | 武汉理工大学 | composite current frequency sensor |
-
2012
- 2012-11-09 CN CN 201220589980 patent/CN202916330U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928649A (en) * | 2012-11-09 | 2013-02-13 | 无锡市锡容电力电器有限公司 | Current sensor for static synchronous compensator |
| CN105572438A (en) * | 2016-03-21 | 2016-05-11 | 山东交通学院 | Current sensor processing technology |
| CN110542788A (en) * | 2019-09-23 | 2019-12-06 | 武汉理工大学 | composite current frequency sensor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130501 |
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| CX01 | Expiry of patent term |