CN2612042Y - Active photoelectric current transformer - Google Patents
Active photoelectric current transformer Download PDFInfo
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- CN2612042Y CN2612042Y CN 03224156 CN03224156U CN2612042Y CN 2612042 Y CN2612042 Y CN 2612042Y CN 03224156 CN03224156 CN 03224156 CN 03224156 U CN03224156 U CN 03224156U CN 2612042 Y CN2612042 Y CN 2612042Y
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Abstract
The utility model discloses an active photoelectric current transformer, comprising a current sensitive hollow coil, a sensitive signal preprocessing circuit, an A/D convert circuit, an electro-optical convert circuit, a power circuit, a transmission optical fiber, an optical-electro convert circuit, a serial-parallel convert circuit, and a computer interface circuit. A sensitive signal output from the current sensitive hollow coil via integrated, phase shifted, and amplified by the sensitive signal preprocessing circuit is fed into the A/D convert circuit to process analogue-digit conversation, the converted digit signal is fed into the electro-optical convert circuit to be converted into optical signal to be output, and the optical signal via the transmission optical fiber is coupled and input into the optical-electro convert circuit to be converted into an electric signal, via the serial-parallel convert circuit to be accessed into the computer interface circuit to be output. The utility model has high measuring accuracy and the application in intelligent and network management of electric system.
Description
Technical field
The utility model relates to a kind of instrument transformer, especially relates to a kind of active photoelectric current inductor that is used for the big current detecting of electric power system mesohigh.
Background technology
Electric power mutual-inductor is the eyes of electric power system, is one of the most basic measuring equipment of Automation of Electric Systems, and it has in electric power system widely uses.At present, electromagnetic transformer has obtained more fully development, yet along with the continuous growth of electric power transfer capacity, the line voltage grade improve constantly and protect the constantly perfect of requirement, conventional current instrument transformer structure exposes incompatible with it weakness gradually, and traditional current transformer is the iron core formula, is made by ferromagnetic material, its insulation system complexity, intrinsic volume is bigger, and ferro resonance and ferromagnetic saturated takes place easily, and dynamic range is little, service band is narrow, influences its certainty of measurement; Induction is output as the heavy current signal of 5A/1A, is difficult to satisfy power system development and Automation of Electric Systems, digitized requirement; Also exist second open circuit to produce high voltage in addition, have explosion hazard, jeopardize operating personnel's personal safety.
The utility model content
The purpose of this utility model is to provide a kind of certainty of measurement height, and can satisfy the active photoelectric current inductor of the needs of Power System Intelligentization and network management.
The purpose of this utility model can realize by following technical measures: comprise the current sense air core coil, the induced signal pre-process circuit, the A/D change-over circuit, electro-optical conversion circuit, power supply circuits, Transmission Fibers, photoelectric switching circuit, serial-parallel conversion circuit and computer interface circuit, current sense air core coil peripheral hardware is useful on and makes things convenient for it to be fixed in shell on the power line, on shell, be provided with shielded box, the induced signal pre-process circuit, the A/D change-over circuit, electro-optical conversion circuit and power supply circuits place in the shielded box, power supply circuits provide the working power of each circuit in the shielded box, the induced signal of current sense air core coil output is through induced signal pre-process circuit integration, phase shift, amplify back input A/D change-over circuit and carry out analog-to-digital conversion, digital signal input electro-optical conversion circuit after the conversion is converted to light signal output again, light signal is input to photoelectric switching circuit through the Transmission Fibers coupling and converts the signal of telecommunication again to, inserts the output of computer interface circuit through serial-parallel conversion circuit.
Current sense air core coil described in the utility model comprises the non magnetic support frame of annular and the induction of signal coil of electromagnetic wire coiled, the induction of signal coil is set around on the non magnetic support frame, induction of signal coil and support frame constitute inductor, are provided with inner insulating layer, electro-magnetic screen layer and insulating outer layer on the described inductor successively; The two ends of described induction of signal coil is stretched out insulating outer layer as the Interface Terminal that connects described current sensing signal pre-process circuit; Be arranged with the verification coil between described inner insulating layer and the electro-magnetic screen layer, the two ends of verification coil is stretched out the Interface Terminal of insulating outer layer as external checking circuit.
Transmission Fibers described in the utility model is provided with silicon rubber insulator, and the circuit and the post processing electric circuit that are positioned at the high-voltage power line side are thoroughly isolated.
Power supply circuits described in the utility model are made up of semiconductor laser and photoelectric transformer, and semiconductor laser is through described Transmission Fibers coupling input photoelectric transformer output direct-current working volts.
Power supply circuits described in the utility model are the power transformer on the survey power line by placing.
The utility model compared with prior art has the following advantages: 1, because sampling and pre-process circuit are installed on the high-voltage power line side, with only be connected between the back level low pressure treatment circuit by optical fiber, without any electromagnetic connection, induction coil adopts the air core coil of no iron core in addition, there are not ferro resonance and ferromagnetic saturated problem, improved certainty of measurement greatly; 2, bandwidth, big, the output light current analog signal of dynamic range can directly link to each other with microsystem, are easy to realize Power System Intelligentization and network management.
Description of drawings
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is the structural representation of shell on the current sense air core coil;
Fig. 3 is the structural representation of current sense air core coil;
Fig. 4 is that the A-A shown in Fig. 3 is to cutaway view;
Fig. 5 is the theory diagram of serial-parallel conversion circuit.
Embodiment
As Fig. 1, shown in 2, present embodiment comprises the current sense air core coil, the induced signal pre-process circuit, the A/D change-over circuit, electro-optical conversion circuit, power supply circuits, Transmission Fibers, photoelectric switching circuit, serial-parallel conversion circuit and computer interface circuit, current sense air core coil peripheral hardware is useful on and makes things convenient for it to be fixed in shell 14 on the power line, on shell, be provided with shielded box 12, the induced signal pre-process circuit, the A/D change-over circuit, electro-optical conversion circuit and power supply circuits place in the shielded box, power supply circuits provide the working power of each circuit in the shielded box, the induced signal of current sense air core coil output is through induced signal pre-process circuit integration, phase shift, amplify back input A/D change-over circuit and carry out analog-to-digital conversion, digital signal input electro-optical conversion circuit after the conversion is converted to light signal output again, light signal is input to photoelectric switching circuit through the Transmission Fibers coupling and converts the signal of telecommunication again to, inserts the output of computer interface circuit through serial-parallel conversion circuit.On Transmission Fibers, be provided with silicon rubber insulator, the circuit and the post processing electric circuit that are positioned at the high-voltage power line side are thoroughly isolated.
Shown in Fig. 3,4, the current sense air core coil comprises the non magnetic support frame 1 of annular and the induction of signal coil 2 of electromagnetic wire coiled, non magnetic support frame 1 adopts the low nonmagnetic substance of temperature coefficient to make, to guarantee the constant of its sectional area, the ring radius of the non magnetic support frame 1 of annular should be far longer than the width of skeleton; Its induction of signal coil 2 even close being around on the non magnetic support frame 1, and the plane of hold-in winding is orthogonal with the magnetic flux that is passed, induction of signal coil and support frame constitute inductor, need not iron core in the whole inductor, there are not ferro resonance and ferromagnetic saturated problem, can have improved certainty of measurement greatly; When an energising power line when being positioned at the center of ring skeleton, whole winding will obtain an induced potential, and the differential value of electric current is directly proportional on this induced potential and the power line of switching on.On inductor, pour into a mould one deck inner insulating layer 3 with insulating material, for the ease of detecting the accuracy of the utility model hollow coil current transformer, uniform winding verification ancillary coil 4 on inner insulating layer, this verification ancillary coil 4 itself does not produce any influence to the performance and the accuracy of hollow coil current transformer.For preventing electromagnetic interference, one deck electro-magnetic screen layer 5 is set outside the verification ancillary coil, on electro-magnetic screen layer 5, pour into a mould one deck insulation protection skin 6 again with insulating material.The two ends of above-mentioned induction of signal coil is stretched out insulating outer layer as the Interface Terminal 7,8 that connects the current sensing signal treatment circuit, and the two ends of verification coil is stretched out the Interface Terminal 9,10 of insulating outer layer as external checking circuit; Four Interface Terminals are installed on the boss 11 with insulating outer layer 6 one.
The current sensing signal pre-process circuit connects two Interface Terminals of induction of signal coil, the current sensing signal treatment circuit is general analog signal processing circuit, be mainly used in the induced potential that the current signal inductive head is obtained and carry out integration, phase shift and processing and amplifying, induced potential divides two-way to handle, as measuring-signal output, the measuring-signal effective value of output is 4V after one passing point, phase shift and the amplification; As guard signal output, the guard signal effective value of output is 225mV after another passing point, phase shift and the amplification.
Signal input A/D change-over circuit after the induced signal pre-process circuit is handled, the A/D change-over circuit adopts 14 high speeds, successive approximation serial a/d 7895 transducers, its highest sampling rate 160sps, single 5V power supply, typical power consumption is 20mW.
Electro-optical conversion circuit is that the digital signal that the A/D change-over circuit is exported is converted to digital optical signal, reaches back level low pressure treatment circuit along optical fiber again.Electro-optical conversion circuit is made up of electrical to optical converter LED and drive circuit thereof, LED is general, and required electric current is bigger, and every paths of LEDs approximately needs 50mW～70mW, because its power consumption is bigger, must reasonably handle to reduce circuit power consumption, so that power supply circuits are easy to realize it.For this reason, select the LED of low valve valve electric current, low-power consumption for use, and its response speed wants fast; Its drive circuit is wanted LED can be provided enough drive currents, and the rising of the light pulse of assurance LED output and the time of decline are less than 20ns.
Owing to place each circuit in the shielded box to be positioned at high-voltage power line one side, can't power to each circuit with the mode of common AC transformation rectification, present embodiment adopts the light power supply, its power supply circuits are made up of semiconductor laser and photoelectric transformer, and the luminous energy that semiconductor laser sends is through Transmission Fibers coupling input photoelectric transformer output direct-current working volts.Because the stable power output of semiconductor laser in order to guarantee the long-time stabilized illumination of semiconductor laser, is selected long-life semiconductor laser for use, and is moved under far below its rated current only at hundreds of mW, simultaneously it is adopted cooling measure.Also can adopt power transformer in addition, induce energy by power transformer from the survey power line, treated circuit adjust into+5V, ± the 15V direct voltage, for the high-pressure side sample circuit provides working power, wherein+and 5V is used for the digital circuit part, and ± 15V is used for the simulation circuit part.
Optical communication interface between high-pressure side circuit and post processing electric circuit adopts the synchronous serial mode, passive clock mode (with respect to the high-pressure side) is the simplest in the method for synchronization, directly at post processing electric circuit with an optical fiber transmission clock, the high-pressure side serial data transmits with another root optical fiber.But this passive clock load mode can only be used when short distance, and in the electric power system distance of the practical wiring between instrument transformer and master-control room usually more than 150m, although the light velocity is very fast, in such passage, also can postpone 1us, arrive the transmission time of 1bit, will inevitably produce the error in data that dislocation makes reception.Therefore can only use initiatively clock mode (with respect to the high-pressure side), the synchronous serial data of high-pressure side transmission need be converted to parallel data to the back level, and delivers to main control computer and carry out calculation process.The conversion of signals that above-mentioned on high-tension side electric light circuit will disperse by certain rule after with the analog quantity discretization is a serial optical signal, by Transmission Fibers serial optical signal is reached back grade photoelectric switching circuit, behind photoelectric switching circuit, obtain data DAT and clock CLK signal.Serial optical signal is converted to parallel data (seeing that Fig. 5 shows) through serial-parallel conversion circuit with synchronous serial data, DAT and CLK transfer serial signal to parallel signal through the shift register in the serial-parallel conversion circuit, unison counter is to the CLK signal-count, when 8 clock signals arrive, promptly receive a byte, counter sends and interrupts application, after the CPU response in the serial-parallel conversion circuit parallel data is read in; After receiving, the CPU in the serial-parallel conversion circuit sends into buffer to data successively, carries out data communication through the RS-232 interface circuit, parallel data is read and is delivered to main control computer by main control computer and carry out calculation process.
Claims (5)
1, a kind of active photoelectric current inductor, it is characterized in that: comprise the current sense air core coil, the induced signal pre-process circuit, the A/D change-over circuit, electro-optical conversion circuit, power supply circuits, Transmission Fibers, photoelectric switching circuit, serial-parallel conversion circuit and computer interface circuit, current sense air core coil peripheral hardware is useful on and makes things convenient for it to be fixed in shell on the power line, on shell, be provided with shielded box, the induced signal pre-process circuit, the A/D change-over circuit, electro-optical conversion circuit and power supply circuits place in the shielded box, power supply circuits provide the working power of each circuit in the shielded box, the induced signal of current sense air core coil output is through induced signal pre-process circuit integration, phase shift, amplify back input A/D change-over circuit and carry out analog-to-digital conversion, digital signal input electro-optical conversion circuit after the conversion is converted to light signal output again, light signal is input to photoelectric switching circuit through the Transmission Fibers coupling and converts the signal of telecommunication again to, inserts the output of computer interface circuit through serial-parallel conversion circuit.
2, active photoelectric current inductor according to claim 1, it is characterized in that: described current sense air core coil comprises the non magnetic support frame of annular and the induction of signal coil of electromagnetic wire coiled, the induction of signal coil is set around on the non magnetic support frame, induction of signal coil and support frame constitute inductor, are provided with inner insulating layer, electro-magnetic screen layer and insulating outer layer on the described inductor successively; The two ends of described induction of signal coil is stretched out insulating outer layer as the Interface Terminal that connects described current sensing signal pre-process circuit; Be arranged with the verification coil between described inner insulating layer and the electro-magnetic screen layer, the two ends of verification coil is stretched out the Interface Terminal of insulating outer layer as external checking circuit.
3, active photoelectric current inductor according to claim 1, it is characterized in that: described Transmission Fibers is provided with silicon rubber insulator.
4, active photoelectric current inductor according to claim 1, it is characterized in that: described power supply circuits are made up of semiconductor laser and photoelectric transformer, and semiconductor laser is through described Transmission Fibers coupling input photoelectric transformer output direct-current working volts.
5, active photoelectric current inductor according to claim 1, it is characterized in that: described power supply circuits are the power transformer on the survey power line by placing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03224156 CN2612042Y (en) | 2003-03-11 | 2003-03-11 | Active photoelectric current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03224156 CN2612042Y (en) | 2003-03-11 | 2003-03-11 | Active photoelectric current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2612042Y true CN2612042Y (en) | 2004-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03224156 Expired - Fee Related CN2612042Y (en) | 2003-03-11 | 2003-03-11 | Active photoelectric current transformer |
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| CN (1) | CN2612042Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100573164C (en) * | 2007-12-07 | 2009-12-23 | 邹运心 | Photo-electric electric power measurement mechanism and method |
| 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 |
| CN101309057B (en) * | 2008-06-19 | 2011-04-06 | 西安交通大学 | Ultrasonic energy supply apparatus of photoelectric current inductor |
| WO2011085517A1 (en) * | 2010-01-13 | 2011-07-21 | 西安华伟光电技术有限公司 | Electronic current transformer based on complete self-excitation power supply |
| CN102957220A (en) * | 2012-11-29 | 2013-03-06 | 南方电网科学研究院有限责任公司 | Non-contact power supply system of active current/voltage transformer |
-
2003
- 2003-03-11 CN CN 03224156 patent/CN2612042Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100573164C (en) * | 2007-12-07 | 2009-12-23 | 邹运心 | Photo-electric electric power measurement mechanism and method |
| CN101309057B (en) * | 2008-06-19 | 2011-04-06 | 西安交通大学 | Ultrasonic energy supply apparatus of photoelectric current inductor |
| WO2011085517A1 (en) * | 2010-01-13 | 2011-07-21 | 西安华伟光电技术有限公司 | Electronic current transformer based on complete self-excitation power supply |
| 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 |
| CN101950659B (en) * | 2010-09-15 | 2012-07-04 | 西安交通大学 | Active photoelectric current transformer using pneumatic and inductive hybrid energy supply |
| CN102957220A (en) * | 2012-11-29 | 2013-03-06 | 南方电网科学研究院有限责任公司 | Non-contact power supply system of active current/voltage transformer |
| CN102957220B (en) * | 2012-11-29 | 2016-02-24 | 南方电网科学研究院有限责任公司 | Non-contact power supply system of active current/voltage transformer |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |