CN105223399A - A kind of hybrid optical fiber current mutual inductor - Google Patents
A kind of hybrid optical fiber current mutual inductor Download PDFInfo
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- CN105223399A CN105223399A CN201510650082.9A CN201510650082A CN105223399A CN 105223399 A CN105223399 A CN 105223399A CN 201510650082 A CN201510650082 A CN 201510650082A CN 105223399 A CN105223399 A CN 105223399A
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Abstract
The invention belongs to electronic device field, provide a kind of hybrid optical fiber current mutual inductor, comprise precision current sensing head, high pressure conversion system, high-pressure side electric power system, signal transmission system, analog signal conditioner system, low-voltage simulation output system and low pressure end electric power system, described precision current sensing head is connected with high pressure conversion system, described high-pressure side electric power system is to high pressure conversion system power supply, described high pressure conversion system is connected with low-voltage simulation output system by signal transmission system, described low-voltage simulation output system is by analog signal conditioner system output signal, described low-voltage simulation system is powered by low pressure end electric power system, described precision current sensing head is provided with two contact jaws, described analog signal conditioner system is connected with meter specially display system, integrate modern electronic technology and optical technology, reliable operation, circuit and light path simple, dynamic responding speed, the performances such as bandwidth are all obviously better than traditional electromagnetic current transducer.
Description
Technical field
The present invention relates to a kind of current transformer, particularly the hybrid optical fiber current mutual inductor of one, belongs to electronic device field.
Background technology
Current transformer, as the visual plant in electric system, has very important effect to the normal operation of electric system and the accurate measurement of electric power.Along with the development of national economy; new power supply voltage level improves constantly; the measurement of system and protection precision require to improve constantly; electronic type novel current transformer substitutes traditional electromagnetic current transducer and to be inevitable trend, but still there is very large defect in the features such as high precision, high reliability, wide responsive bandwidth.
Passive structure is more prevailing in recent years, its advantage is that structure is simple, and completely eliminate traditional electromagnetic induction element, without magnetic saturation problem, give full play to the feature of photo-electricity mutual-inductor, especially do not need power supply apparatus in high-pressure side, make high-pressure side simplicity of design, mutual inductor operation life is guaranteed.Its shortcoming is that optical device manufacture difficulty is large, and the high precision of measurement is not easy to reach.Especially this kind of current transformer affects serious by Fil moral (Verdet) constant and linear birefrigence.And the nonlinearities change still not having better method can solve the change of Verdet constant with temperature at present and occur and system linearity birefringence problem, so be difficult to obtain practical application in the industry, the research of current this kind of mutual inductor is all only limitted under lab realize.
The advantage of full fiber type photoelectric current inductor is that transducing head structure is the simplest, than passive easy manufacture, precision and the life-span higher than passive with reliability.Shortcoming is that the optical fiber of this mutual inductor needs polarization maintaining optical fibre, and the ordinary optic fibre adopted than active type and passive is special, and the polarization maintaining optical fibre making high stability is very difficult, and cost is higher.
Theoretically, full fiber type and passive current transformer have that measurement range is large, electrical insulating property is excellent, structure is simple, sensitivity high.But the sensor of reality also exists many problems, the treatment technology of their light source, optical fiber and signal etc. require higher.The most important thing is, the birefringence effect of system optical fiber used itself and Verdet constant change along with the change of environmental factor (as temperature, pressure, vibrations etc.), the precision that impact is measured.This gives the adjustment of whole light path, calibration and shockproof etc. brings very large difficulty.
Summary of the invention
The technical problem to be solved in the present invention overcomes existing defect, provides the present invention a kind of hybrid optical fiber current mutual inductor, effectively can solve the problem in background technology.
In order to solve the problems of the technologies described above, the invention provides following technical scheme:
A kind of hybrid optical fiber current mutual inductor of the present invention, comprise precision current sensing head, high pressure conversion system, high-pressure side electric power system, signal transmission system, analog signal conditioner system, low-voltage simulation output system and low pressure end electric power system, described precision current sensing head is connected with high pressure conversion system, described high-pressure side electric power system is to high pressure conversion system power supply, described high pressure conversion system is connected with low-voltage simulation output system by signal transmission system, described low-voltage simulation output system is by analog signal conditioner system output signal, described low-voltage simulation system is powered by low pressure end electric power system, described precision current sensing head is provided with two contact jaws, described analog signal conditioner system is connected with meter specially display system.
As a preferred technical solution of the present invention, described precision current sensing head adopts rogowski coil as sensing element.
As a preferred technical solution of the present invention, described high-pressure side electric power system adopts optical drive method to power, and comprises laser instrument, energy-transmission optic fibre, photoelectric cell and high-pressure side, by laser instrument Emission Lasers, luminous energy is transferred to high-pressure side through energy-transmission optic fibre.
As a preferred technical solution of the present invention, described signal transmission system comprises high-pressure section and low-pressure section, described high-pressure section comprises integrator, A/D converter and timing adjusting circuit, described integrator and A/D converter, high pressure conversion system is connected, described low-pressure section comprises D/A converter, microprocessor and timing generator circuit, described A/D converter is connected with D/A converter by optical-fibre channel, described D/A converter passes through timing generator circuit, and be connected with timing adjusting circuit by optical-fibre channel, described timing adjusting circuit is connected with A/D converter, described A/D converter, D/A converter, timing generator circuit and timing adjusting circuit form a circulation, described microprocessor is connected with low-voltage simulation output system.
As a preferred technical solution of the present invention, described low pressure end electric power system is made up of AC/DC transformation system, electromagnetic compensation system, power bus-bar and iron-core coil, and described AC/DC transformation system is all connected with iron-core coil with electromagnetic compensation system.
As a preferred technical solution of the present invention, described meter specially display system comprises A input channel and B input channel, described A input channel and B input channel are all connected with filtering circuit by AC signal full-wave rectifying circuit, described filtering circuit is connected with MCU system by A/D converter, and described MCU system is connected with charactron.
As a preferred technical solution of the present invention, described analog signal conditioner system is made up of difference preamplifier, low-pass filter, main amplifier, 50Hz trapper, A/D converter and dsp system, connects low-pass filter, main amplifier, 50Hz trapper, A/D converter, dsp system successively by difference preamplifier.
The beneficial effect that the present invention reaches is:
1, hybrid optical fiber current mutual inductor integrates modern electronic technology and optical technology, reliable operation, circuit and light path are simple, the requirement that ratio and difference can both meet well to 0.2 grade of current transformer in GB, the performance such as dynamic responding speed, bandwidth is all obviously better than traditional electromagnetic current transducer;
2, analog signal conditioner system exports can provide with the form of analog quantity or digital quantity at secondary side, by the present computer technology, realizes networking and the intellectuality of mutual inductor easily, realizes the unmanned of transformer station, the accurate measurement of electric energy.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.
In the accompanying drawings:
Fig. 1 is the one-piece construction schematic diagram of a kind of hybrid optical fiber current mutual inductor described in the embodiment of the present invention;
Fig. 2 is the high-pressure side electric power system structural representation of a kind of hybrid optical fiber current mutual inductor described in the embodiment of the present invention;
Fig. 3 is the signal transmission system of a kind of hybrid optical fiber current mutual inductor described in the embodiment of the present invention;
Fig. 4 is the analog signal conditioner system of a kind of hybrid optical fiber current mutual inductor described in the embodiment of the present invention;
Fig. 5 is the low pressure end electric power system of a kind of hybrid optical fiber current mutual inductor described in the embodiment of the present invention;
Fig. 6 is the meter specially display system of a kind of hybrid optical fiber current mutual inductor described in the embodiment of the present invention.
Number in the figure: 1-precision current sensing head; 2-high pressure conversion system; 3-high-pressure side electric power system; 4-signal transmission system; 5-analog signal conditioner system; 6-low-voltage simulation output system; 7-low pressure end electric power system; 8-contact jaw; 9-meter specially display system;
300-laser instrument; 301-energy-transmission optic fibre; 302-photoelectric cell; 303-high-pressure side;
400-high-pressure section; 401-low-pressure section; 402-integrator; 403-A/D converter; 404-timing adjusting circuit; 405-D/A converter; 406-microprocessor; 407-timing generator circuit; 408-optical-fibre channel;
500-difference preamplifier; 501-low-pass filter; 502-main amplifier; 503-50Hz trapper; 504-A/D converter; 505-DSP system;
700-AC/DC transformation system; 701-electromagnetic compensation system; 702-power bus-bar; 703-iron-core coil;
900-A input channel; 901-B input channel; The full bag rectification circuit of 902-AC signal; 903-filtering circuit; 904-A/D converter; 905-MCU system; 906-charactron.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Embodiment: as shown in figures 1 to 6, a kind of hybrid optical fiber current mutual inductor of the present invention, comprise precision current sensing head 1, high pressure conversion system 2, high-pressure side electric power system 3, signal transmission system 4, analog signal conditioner system 5, low-voltage simulation output system 6 and low pressure end electric power system 7, described precision current sensing head 1 is connected with high pressure conversion system 2, described high-pressure side electric power system 3 pairs of high pressure conversion systems 2 are powered, described high pressure conversion system 2 is connected with low-voltage simulation output system 6 by signal transmission system 4, described low-voltage simulation output system 6 is outputed signal by analog signal conditioner system 5, described low-voltage simulation output system 6 is powered by low pressure end electric power system 7, described precision current sensing head 1 is provided with two contact jaws 8, described analog signal conditioner system 5 is connected with meter specially display system 9,
Described precision current sensing head 1 adopts rogowski coil as sensing element;
Described high-pressure side electric power system 3 adopts optical drive method to power, and comprises laser instrument 300, energy-transmission optic fibre 301, photoelectric cell 302 and high-pressure side 303, by laser instrument 300 Emission Lasers, luminous energy is transferred to high-pressure side 303 through energy-transmission optic fibre 301;
Described signal transmission system 4 comprises high-pressure section 400 and low-pressure section 401, described high-pressure section 400 comprises integrator 402, A/D converter 403 and timing adjusting circuit 404, described integrator 402 and A/D converter 403, high pressure conversion system 2 is connected, described low-pressure section 401 comprises D/A converter 405, microprocessor 406 and timing generator circuit 407, described A/D converter 403 is connected with D/A converter 405 by optical-fibre channel 408, described D/A converter 405 is by timing generator circuit 407, and be connected with timing adjusting circuit 404 by optical-fibre channel 408, described timing adjusting circuit 404 is connected with A/D converter 403, described A/D converter 403, D/A converter 405, timing generator circuit 407 and timing adjusting circuit 404 form a circulation, described microprocessor 406 is connected with low-voltage simulation output system 6,
Described low pressure end electric power system 7 is made up of AC/DC transformation system 700, electromagnetic compensation system 701, power bus-bar 702 and iron-core coil 703, and described AC/DC transformation system 700 is all connected with iron-core coil 703 with electromagnetic compensation system 701;
Described meter specially display system 9 comprises A input channel 900 and B input channel 901, described A input channel 900 and B input channel 901 are all connected with filtering circuit 903 by AC signal full-wave rectifying circuit 902, described filtering circuit 903 is connected with MCU system 905 by A/D converter 904, and described MCU system 905 is connected with charactron 906;
Described analog signal conditioner system 5 is made up of difference preamplifier 500, low-pass filter 501, main amplifier 502,50Hz trapper 503, A/D converter 504 and dsp system 505, connects low-pass filter 501, main amplifier 502,50Hz trapper 503, A/D converter 504, dsp system 505 successively by difference preamplifier 500.
Rogowski coil of the present invention and the key distinction of traditional iron core current transformer are that the two material used is different with impedance operator, Rogowski coil is in fact by one group of conductor coils around in a non-magnetic core, and its secondary side load is generally large resistance; And iron core current transformer is by one group of conductor coils around in a magnetic core, its secondary side load is a very little sampling resistor.Compared with conventional current mutual inductor, Rogowski coil has following advantage: (1) measuring accuracy is high: precision can be designed into higher than 0.1%, is generally 0.1% ~ 0.3%; (2) measurement range is wide: owing to not having the problem of core sataration, and the range of current that same winding can be used to measure can from several amperes to a few kiloampere; (3) wide frequency range: generally can be designed into 0.1Hz to 1MHz, the bandwidth of special be designed into 200MHz; (4) small area analysis in the non-serviceable restricted field of other technology can be measured; (5) manufacturing cost is low.The method that high voltage supply system of the present invention adopts light to promote, by high power laser Emission Lasers, laser energy being sent to high-pressure side through energy-transmission optic fibre, becoming electric energy at high-pressure side through opto-electronic conversion, is system power supply.
The output signal of Rogowski coil of the present invention will be sent to low pressure end to carry out Graphics Processing or to provide actuating signal for protective device through conversion; this just requires that the simulating signal high-pressure side obtains is sent to low pressure end without distortion, ensures the insulation completely of high-pressure section and low-pressure section simultaneously.At present, electronic current mutual inductor is all adopt optical fiber as transmission channel.Optical fiber, because of its good insulativity, electromagnetism interference, permanent mission life, very low transmission attenuation, has become the first-selected transmission medium of the various communications field.The simulating signal that Rogowski coil exports is carried out A/D conversion; then light signal is become by electrical to optical converter; after Optical Fiber Transmission; at low pressure end through opto-electronic conversion, D/A conversion; recover original simulating signal, through process further, data can be provided for Displaying Meter; for protective device provides control signal, realize the effect of current transformer in electric system.The structured flowchart of whole system is as Fig. 2-5.In whole system, the work schedule of low pressure end D/A and high-pressure side A/D is produced by digital circuit, in order to the asynchronous problem of the work that upper and lower circuit can not occur, the clock generator of low pressure end is except giving local D/A and providing work schedule, and the A/D being also high-pressure side by an optical-fibre channel provides work schedule.Like this, A/D and D/A can continuous working under clock coordination when unified.We do not adopt microprocessor to work to drive A/D and D/A, because any processor always inevitably generating program run and to fly and crash phenomenon, this all can cause the of short duration work of A/D and D/A abnormal, and this is unallowed in the current transformer needing continuous working.
The hybrid optical fiber current mutual inductor of the present invention integrates modern electronic technology and optical technology, reliable operation, circuit and light path are simple, the requirement that ratio and difference can both meet well to 0.2 grade of current transformer in GB, the performance such as dynamic responding speed, bandwidth is all obviously better than traditional electromagnetic current transducer; Analog signal conditioner system exports can provide with the form of analog quantity or digital quantity at secondary side, by the present computer technology, realizes networking and the intellectuality of mutual inductor easily, realizes the unmanned of transformer station, the accurate measurement of electric energy.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a hybrid optical fiber current mutual inductor, it is characterized in that, comprise precision current sensing head (1), high pressure conversion system (2), high-pressure side electric power system (3), signal transmission system (4), analog signal conditioner system (5), low-voltage simulation output system (6) and low pressure end electric power system (7), described precision current sensing head (1) is connected with high pressure conversion system (2), described high-pressure side electric power system (3) is powered to high pressure conversion system (2), described high pressure conversion system (2) is connected with low-voltage simulation output system (6) by signal transmission system (4), described low-voltage simulation output system (6) is outputed signal by analog signal conditioner system (5), described low-voltage simulation output system (6) is powered by low pressure end electric power system (7), described precision current sensing head (1) is provided with two contact jaws (8), described analog signal conditioner system (5) is connected with meter specially display system (9).
2. the hybrid optical fiber current mutual inductor of one according to claim 1, is characterized in that, described precision current sensing head (1) adopts rogowski coil as sensing element.
3. the hybrid optical fiber current mutual inductor of one according to claim 1, it is characterized in that, described high-pressure side electric power system (3) adopts optical drive method to power, comprise laser instrument (300), energy-transmission optic fibre (301), photoelectric cell (302) and high-pressure side (303), by laser instrument (300) Emission Lasers, luminous energy is transferred to high-pressure side (303) through energy-transmission optic fibre (301).
4. the hybrid optical fiber current mutual inductor of one according to claim 1 is put, it is characterized in that, described signal transmission system (4) comprises high-pressure section (400) and low-pressure section (401), described high-pressure section (400) comprises integrator (402), A/D converter (403) and timing adjusting circuit (404), described integrator (402) and A/D converter (403), high pressure conversion system (2) is connected, described low-pressure section (401) comprises D/A converter (405), microprocessor (406) and timing generator circuit (407), described A/D converter (403) is connected with D/A converter (405) by optical-fibre channel (408), described D/A converter (405) is by timing generator circuit (407), and be connected with timing adjusting circuit (404) by optical-fibre channel (408), described timing adjusting circuit (404) is connected with A/D converter (403), described A/D converter (403), D/A converter (405), timing generator circuit (407) and timing adjusting circuit (404) form a circulation, described microprocessor (406) is connected with low-voltage simulation output system (6).
5. the hybrid optical fiber current mutual inductor of one according to claim 1, it is characterized in that, described low pressure end electric power system (7) is made up of AC/DC transformation system (700), electromagnetic compensation system (701), power bus-bar (702) and iron-core coil (703), and described AC/DC transformation system (700) is all connected with iron-core coil (703) with electromagnetic compensation system (701).
6. the hybrid optical fiber current mutual inductor of one according to claim 1, it is characterized in that, described meter specially display system (9) comprises A input channel (900) and B input channel (901), described A input channel (900) and B input channel (901) are all connected with filtering circuit (903) by AC signal full-wave rectifying circuit (902), described filtering circuit (903) is connected with MCU system (905) by A/D converter (904), and described MCU system (905) is connected with charactron (906).
7. the hybrid optical fiber current mutual inductor of one according to claim 1, it is characterized in that, described analog signal conditioner system (5) is by difference preamplifier (500), low-pass filter (501), main amplifier (502), 50Hz trapper (503), A/D converter (504) and dsp system (505) composition, low-pass filter (501) is connected successively by difference preamplifier (500), main amplifier (502), 50Hz trapper (503), A/D converter (504), dsp system (505).
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| CN201510650082.9A CN105223399A (en) | 2015-10-08 | 2015-10-08 | A kind of hybrid optical fiber current mutual inductor |
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| CN201510650082.9A CN105223399A (en) | 2015-10-08 | 2015-10-08 | A kind of hybrid optical fiber current mutual inductor |
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| CN201478107U (en) * | 2009-09-08 | 2010-05-19 | 山东电力集团公司潍坊供电公司 | Optical fiber current transformer |
| CN101950659A (en) * | 2010-09-15 | 2011-01-19 | 西安交通大学 | Active photoelectric current transformer using pneumatic and inductive hybrid energy supply |
| CN201804700U (en) * | 2010-08-24 | 2011-04-20 | 河南电力试验研究院 | Laser energy supply-based electronic current transformer |
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2015
- 2015-10-08 CN CN201510650082.9A patent/CN105223399A/en active Pending
Patent Citations (4)
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| CN201478107U (en) * | 2009-09-08 | 2010-05-19 | 山东电力集团公司潍坊供电公司 | Optical fiber current transformer |
| CN201804700U (en) * | 2010-08-24 | 2011-04-20 | 河南电力试验研究院 | Laser energy supply-based electronic current transformer |
| CN101950659A (en) * | 2010-09-15 | 2011-01-19 | 西安交通大学 | Active photoelectric current transformer using pneumatic and inductive hybrid energy supply |
| CN104122428A (en) * | 2014-08-04 | 2014-10-29 | 青岛科汇电气有限公司 | Electronic current transformer adopting optical fiber transmission analog signals |
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Application publication date: 20160106 |