CN103543320A - High-potential current real-time detection device - Google Patents
High-potential current real-time detection device Download PDFInfo
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- CN103543320A CN103543320A CN201310438043.3A CN201310438043A CN103543320A CN 103543320 A CN103543320 A CN 103543320A CN 201310438043 A CN201310438043 A CN 201310438043A CN 103543320 A CN103543320 A CN 103543320A
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Abstract
A high-potential current real-time detection device comprises a high-potential power gaining circuit, a power module, a current sensor, a signal conditioning circuit, a coding and decoding digital circuit and a photoelectric signal converter. The high-potential energy gaining circuit acquires power from high potential near detecting points directly and transmits to the power module after the power in converted into low-voltage alternating current. The power module rectifies the alternating current, filters, and outputs direct current to the current sensor. The current sensor transmits signals to the signal conditioning circuit, and the signal conditioning circuit outputs shaped current signals. The coding and decoding digital circuit converts analog signals into digital signals and codes the signals, and the coded signals are transmitted to a remote control system through the photoelectric signal converter. The device has the advantages of simple and compact structure and low cost, detected current information is high in interference resistance, instantaneity and accuracy, high voltage and low voltage are isolated actually, and using security of a high voltage device is improved.
Description
Technical field
The present invention is mainly concerned with the state-detection field of current transformer in high-pressure system, refers in particular to a kind of high-potential current real-time detection apparatus.
Background technology
At present, the current sensing means that is applied to current transformer in high-pressure system mainly adopts following two kinds of modes:
The one, after utilizing current transformer to measure, by secondary cable, directly send simulating signal to converter control system.The shortcoming of which be simulating signal through longer secondary cable transmission easily by external electromagnetic environmental interference, the Electro Magnetic Compatibility of whole control system is declined; Meanwhile, because secondary cable is owing to considering that insulation is in current transformer Interior layout design difficulty, only by stream isolation mutually, in high voltage applications occasion, can not realize effective high-low pressure isolation, have certain potential safety hazard.
Current transformer has good insulating property, can directly high-tension current signal be transferred to control system by low-voltage cable.Yet for needing control accuracy to require higher application scenario, current transformer cannot be competent at.
The 2nd, after utilizing current transformer to measure, by radio signal, transfer data to long-range receiving trap, get and can adopt a high position to get energy.But which exists transmission, data speed is slow, and wireless system is easily subject to the impact of periphery electromagnetic environment, for accuracy and the security of data, can not be guaranteed.
For high-voltage power electronic device (as 35kV SVG and APF etc.), need Real-time Collection current signal, current transformer cannot meet the requirement of control accuracy, and current sensor is because insulation cannot directly be used not.
Summary of the invention
The technical problem to be solved in the present invention is just: the technical matters existing for prior art, the invention provides a kind of simple and compact for structure, with low cost, can make that the current information strong interference immunity, the real-time that detect are good and precision is high, guarantee that high-low pressure realizes real isolation, improves the high-potential current real-time detection apparatus of high-tension apparatus safety in utilization simultaneously, and efficiently solve current sensor in the high-pressure system application inadequate difficult problem that insulate.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of high-potential current real-time detection apparatus, comprise high potential energy collecting circuit, power module, current sensor, signal conditioning circuit, encoding and decoding digital circuit and photoelectric signal converter, described high potential energy collecting circuit directly obtains AC energy near noble potential check point, be converted to after low-voltage AC, by electrical energy transfer to power module; Described power module is by AC energy rectification filtering, and the direct current energy of outputting high quality is supplied with current sensor; Described current sensor passes to signal conditioning circuit by the signal detecting, the current signal after described signal conditioning circuit output Shaping; Described encoding and decoding digital circuit is converted to simulating signal digital signal and encodes, and through the signal of coding, transmits tele-control system after by photoelectric signal converter again.
As a further improvement on the present invention:
Described tele-control system transmits control signal and encoding and decoding digital circuit is carried out to the switching of mode of operation.
Described high potential energy collecting circuit, current sensor and signal conditioning circuit be all in same noble potential, and with tele-control system between by optical fiber, be connected.
Compared with prior art, the invention has the advantages that:
1, antijamming capability of the present invention is strong, and optical-fibre communications ensures the accurate and steady operation of detection signal under high-strength magnetic environment.
2, the present invention realizes detection signal electrical isolation between high-low pressure by optical-fibre communications, can avoid control system and noble potential to have electrical link.
What 3, the present invention realized pick-up unit by high potential energy collecting is independent of low-pressure secondary system power supply, has guaranteed that the present invention can be independently and low-pressure system work, realizes real high-low pressure potential isolation.
4, the present invention adopts current sensor, and accuracy of detection is higher.
5, the present invention adopts programming logic gate array FPGA or CPLD to carry out signal processing, numerical coding and decoding to detection signal, and computing velocity is fast, stable, makes detection signal corresponding with receiving trap, safe.
6, optical fiber of the present invention is not subject to the impact of insulation distance, easy for installation, and wiring constraint is few.
Accompanying drawing explanation
Fig. 1 is the control principle schematic diagram of the inventive method.
Fig. 2 is the electrical schematic diagram of the present invention when chain type current transformer apparatus system is applied.
Marginal data:
1, high potential energy collecting circuit; 2, power module; 3, current sensor; 4, signal conditioning circuit; 5, encoding and decoding digital circuit; 6, photoelectric signal converter.
Embodiment
Below with reference to Figure of description and specific embodiment, the present invention is described in further details.
As shown in Figure 1, high-potential current real-time detection apparatus of the present invention, comprise high potential energy collecting circuit 1, power module 2, current sensor 3, signal conditioning circuit 4, encoding and decoding digital circuit 5 and photoelectric signal converter 6, this high potential energy collecting circuit 1 directly obtains AC energy near noble potential check point, be converted to after low-voltage AC, by electrical energy transfer to power module 2; Power module 2 is by AC energy rectification filtering, and the direct current energy of outputting high quality is supplied with data processing centre's (not shown) and current sensor 3; Current sensor 3 passes to signal conditioning circuit 4 by the signal detecting, the current signal after signal conditioning circuit 4 output Shapings; Encoding and decoding digital circuit 5 is converted to simulating signal digital signal and encodes, signal through coding transmits tele-control system after by photoelectric signal converter 6 again, and tele-control system also can transmit control signal encoding and decoding digital circuit 5 is carried out to the switching of mode of operation.
The real-time current detection device of high potential energy collecting of the present invention, by a high position get can and the optical-fibre communications harm of having avoided noble potential electric energy intrusion secondary low-voltage side to produce, equipment is used safer, adopt optical-fibre communications can effectively avoid the badly interference to current delivery signal of electromagnetic environment simultaneously, by programming logic gate array FPGA or complex programmable logic device (CPLD), carry out data processing, and carry out coding and decoding, improve processing speed and data security and be also guaranteed, be specially adapted to the current sample of high-vol.
In the present embodiment, high potential energy collecting circuit 1, current sensor 3 and signal conditioning circuit 4 be all in same noble potential, and with tele-control system between by optical fiber, be connected.Signal conditioning circuit 4 adopts high potential energy collecting, does not need outside that secondary power supply is provided.
In the present embodiment, the current signal collecting from current sensor 3 is carried out to digitized processing, tele-control system is directly accepted digital signal, without tele-control system itself, carries out signal processing.The instruction of the control monitoring device in the present invention, controller being sent adopts the working method of FPGA or CPLD.
As shown in Figure 2, for the electrical schematic diagram of the present invention in the application of chain type current transformer apparatus system, in figure, I is current transformer, and in figure, II place is pick-up unit of the present invention, it is installed on the same mutually with common stream, and difference is the current signal that the present invention passes through optical fiber output detections.
Below be only the preferred embodiment of the present invention, protection scope of the present invention is also not only confined to above-described embodiment, and all technical schemes belonging under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (3)
1. a high-potential current real-time detection apparatus, it is characterized in that, comprise high potential energy collecting circuit (1), power module (2), current sensor (3), signal conditioning circuit (4), encoding and decoding digital circuit (5) and photoelectric signal converter (6), described high potential energy collecting circuit (1) directly obtains AC energy near noble potential check point, be converted to after low-voltage AC, by electrical energy transfer to power module (2); Described power module (2) is by AC energy rectification filtering, and the direct current energy of outputting high quality is supplied with current sensor (3); Described current sensor (3) passes to signal conditioning circuit (4) by the signal detecting, the current signal after described signal conditioning circuit (4) output Shaping; Described encoding and decoding digital circuit (5) is converted to simulating signal digital signal and encodes, and through the signal of coding, transmits tele-control system after by photoelectric signal converter (6) again.
2. high-potential current real-time detection apparatus according to claim 1, is characterized in that, described tele-control system transmits control signal encoding and decoding digital circuit (5) is carried out to the switching of mode of operation.
3. high-potential current real-time detection apparatus according to claim 1 and 2, it is characterized in that, described high potential energy collecting circuit (1), current sensor (3) and signal conditioning circuit (4) be all in same noble potential, and with tele-control system between by optical fiber, be connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310438043.3A CN103543320A (en) | 2013-09-24 | 2013-09-24 | High-potential current real-time detection device |
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| CN201310438043.3A CN103543320A (en) | 2013-09-24 | 2013-09-24 | High-potential current real-time detection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267273A (en) * | 2014-09-05 | 2015-01-07 | 江苏银佳企业集团有限公司 | Quick detection circuit and method for mains fluctuation |
| CN110413035A (en) * | 2019-09-02 | 2019-11-05 | 武汉松野智能仪表有限公司 | A kind of intelligent signal isolator circuit |
| CN111610742A (en) * | 2020-06-08 | 2020-09-01 | 北京无线电测量研究所 | Remote control device, equipment and remote control system |
| CN112505400A (en) * | 2020-12-17 | 2021-03-16 | 南方电网数字电网研究院有限公司 | High potential current detection device and chain type current transformation system |
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| CN101937764A (en) * | 2010-09-15 | 2011-01-05 | 西安交通大学 | Active photoelectric current transformermutual inductor by mixed power supply of ultrasound and induction |
| CN101949972A (en) * | 2010-08-12 | 2011-01-19 | 浙江省电力公司 | Current measurement device for high-voltage converter |
| US20110184675A1 (en) * | 2010-01-28 | 2011-07-28 | Teridian Semiconductor Corp. | Isolated current sensor with codec |
| CN103217566A (en) * | 2013-04-07 | 2013-07-24 | 武汉格蓝若光电互感器有限公司 | Current online monitoring integrated system of on-load tap changer |
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| CN201181310Y (en) * | 2008-03-13 | 2009-01-14 | 苏州市华电电气技术有限公司 | High potential side electric current measurement apparatus |
| US20110184675A1 (en) * | 2010-01-28 | 2011-07-28 | Teridian Semiconductor Corp. | Isolated current sensor with codec |
| CN101949972A (en) * | 2010-08-12 | 2011-01-19 | 浙江省电力公司 | Current measurement device for high-voltage converter |
| CN101937764A (en) * | 2010-09-15 | 2011-01-05 | 西安交通大学 | Active photoelectric current transformermutual inductor by mixed power supply of ultrasound and induction |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267273A (en) * | 2014-09-05 | 2015-01-07 | 江苏银佳企业集团有限公司 | Quick detection circuit and method for mains fluctuation |
| CN104267273B (en) * | 2014-09-05 | 2017-02-15 | 江苏银佳企业集团有限公司 | Quick detection circuit and method for mains fluctuation |
| CN110413035A (en) * | 2019-09-02 | 2019-11-05 | 武汉松野智能仪表有限公司 | A kind of intelligent signal isolator circuit |
| CN110413035B (en) * | 2019-09-02 | 2024-05-24 | 武汉松野智能仪表有限公司 | Intelligent signal isolator circuit |
| CN111610742A (en) * | 2020-06-08 | 2020-09-01 | 北京无线电测量研究所 | Remote control device, equipment and remote control system |
| CN112505400A (en) * | 2020-12-17 | 2021-03-16 | 南方电网数字电网研究院有限公司 | High potential current detection device and chain type current transformation system |
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