CN2911909Y - Active opticalfiber voltage/current metual-inductor - Google Patents
Active opticalfiber voltage/current metual-inductor Download PDFInfo
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- CN2911909Y CN2911909Y CN 200620032259 CN200620032259U CN2911909Y CN 2911909 Y CN2911909 Y CN 2911909Y CN 200620032259 CN200620032259 CN 200620032259 CN 200620032259 U CN200620032259 U CN 200620032259U CN 2911909 Y CN2911909 Y CN 2911909Y
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Abstract
The utility model provides an active optical fiber voltage current transformer, comprising a capacitive voltage divider (I), a Rogowski coil (II), an electromagnetic current transformer of a secondary parallel voltage dependent resistor (III), a power supply circuit (IV), a signal processing circuit (V), an electro optical converter (VI), an optical fiber (VII), and an optoelectronic converter (VIII). The output signal of the capacitive voltage divider (I) and the output signal of the Rogowski coil (II) are switched in the signal processing circuit (V), the output of the signal processing circuit (V) is transmitted to the optoelectronic converter (VIII) through the electro optical converter (VI) and through the optical fiber (VII), and is output from the optoelectronic converter (VIII) for protecting and power measuring required signal, the output of the electromagnetic current transformer of a secondary parallel voltage dependent resistor (III) is connected to the power supply circuit (IV), and the signal processing circuit (V) and the electro optical converter (VI) are supplied by the power supply circuit (IV).
Description
Technical field
The utility model belongs to the power measurement field, relates to a kind of active formula optical-fibre voltage current transformer.
Background technology
In traditional power measurement field, usually adopt the electromagnetic potential current transformer to carry out voltage and current measurement, the output line voltage of voltage transformer (PT) is 100 volts, the output current of current transformer is 5A/1A, usually use the capacitive divided voltage instrument transformer for the voltage measurement more than the 220KV, this instrument transformer also disposes electromagnetic potential transformer behind capacitance partial pressure, along with the raising of grid power transmission electric pressure and the increase of transmission of electricity energy, the cost of traditional instrument transformer is also more and more higher.Traditional voltage current transformer in use also exists many defectives, as may with electrical network generation ferro resonance, since the uncertainty of load make its precision can not very high (common 0.2 grade), needs, the voltage transformer secondary side that can not satisfy digital electric power metering and digital protective relay exist bigger pressure drop error etc.Adopt the photoelectric voltage current transformer can overcome above defective, at present active formula photo-electricity mutual-inductor of photo-electricity mutual-inductor and passive type photo-electricity mutual-inductor (comprising based on the optical voltage transformer of Pockels electro optic effect and based on the optical current mutual inductor of Faraday magneto optical effect) are two kinds, the passive type photo-electricity mutual-inductor is not because its stability problem also obtains popularization at present, and active formula photo-electricity mutual-inductor also exists some technical problems (as precision problem and power supply problem), because the existence of electric capacity manufacture craft error, make that the voltage signal that obtains by the capacitance partial pressure circuit can not be very accurate, produce precision and be 0.1 grade active formula photo-electricity mutual-inductor difficulty relatively also, the on high-tension side power supply of present active formula photo-electricity mutual-inductor mainly is to realize by the laser energy supply, this need lay additional optical fibre channel and realize, and the power output very little (usually less than 200MW) of present laser tube, adopt many laser tubes that cost will be improved greatly, and adopt battery (solar cell or electric power storage battery) power supply that many defectives are also arranged.
Therefore, up to the present, active formula optical-fibre voltage current transformer is also existing some technological deficiencies aspect high-pressure side energy supply and the raising measuring accuracy, and the utility model can address this problem.
The utility model content
The purpose of this utility model provides a kind of novel active formula optical-fibre voltage current transformer.
The utility model adopts following technical scheme: a kind of active formula optical-fibre voltage current transformer, it comprises voltage transformer, current transformer, power circuit, signal processing circuit, electrical to optical converter, optical-electrical converter, optical fiber composition, voltage transformer is realized that by capacitor voltage divider current transformer is realized by the Rogowski coil.Power circuit comprises the electromagnetic current transducer of secondary side piezo-resistance in parallel, bridge rectifier filter circuit, voltage stabilizing circuit, the charging circuit of rechargeable battery and battery is formed, piezo-resistance is used for suppressing electromagnetic current transducer secondary side overvoltage when short circuit malfunction, also be used for when power network current surpasses the rated current of electromagnetic current transducer, keeping the secondary side output voltage of this current transformer bigger increase can not occur, the secondary side output voltage great fluctuation process can not occur under the situation of electrical network overcurrent or failed shorted like this, the secondary voltage of electromagnetic current transducer is through bridge rectifier filter circuit, be used for after the voltage stabilizing circuit voltage stabilizing to signal processing circuit and electrical to optical converter power supply, because the current fluctuation scope of electrical network is very big, under the very low situation of power network current, when the supply voltage that is lower than signal processing circuit and electrical to optical converter when the current rectifying and wave filtering circuit output voltage requires, change by rechargeable battery and power, rechargeable battery is charged by the charging circuit of battery, the input termination current rectifying and wave filtering circuit output of battery charger.Signal processing circuit comprises the error correction unit of capacitor voltage divider measuring voltage; the integral unit of Rogowski coil output signal; A/D (analog to digital converter) conversion unit; CPU element is formed; the operational amplification circuit that error correction unit adopts high precision operating amplifier and precision resistance to form is formed; integral unit adopts the active integrating circuit of high accuracy to realize; the output of error correction unit and integral unit connects the A/D converting unit; CPU element is handled the output digital signal of A/D converting unit; export the respective pulses of the voltage and current signal that collects simultaneously to electrical to optical converter through serial ports according to the communication protocol of photo-electricity mutual-inductor; electrical to optical converter carries out carrier modulation to these pulses; and be converted into optical signals optical fiber and be sent to optical-electrical converter; in optical-electrical converter these carrier signals are carried out demodulation, output is used for the signal of relaying protection and digital measurement.
The active formula optical-fibre voltage of the utility model current transformer is by capacitor voltage divider (I); Rogowski coil (II); the electromagnetic current transducer (III) of secondary side piezo-resistance in parallel; power circuit (IV); signal processing circuit (V); electrical to optical converter (VI); optical fiber (VII); optical-electrical converter (VIII) is formed; the output signal of capacitor voltage divider (I) connects signal processing circuit (V); the output of signal processing circuit (V) constitutes Fiber-Optic Voltage through electrical to optical converter (VI) after optical fiber (VII) reaches optical-electrical converter (VIII); the output signal of Rogowski coil (II) connects signal processing circuit (V); the output of signal processing circuit (V) constitutes optical fiber current mutual inductor through electrical to optical converter (VI) after optical fiber (VII) reaches optical-electrical converter (VIII); be used for digital protecting and power measurement desired signal by optical-electrical converter output; the output of the electromagnetic current transducer (III) of secondary side piezo-resistance in parallel connects power circuit (IV); signal processing circuit (V) is powered by power circuit (IV) with electrical to optical converter (VI); electromagnetic current transducer (III) secondary side is made up of a plurality of windings; the output of each winding connects power circuit (IV) separately; power circuit (IV) is by bridge rectifier filter circuit (1); voltage stabilizing circuit (2); rechargeable battery (3); the charging circuit of battery (4) is formed; the output of electromagnetic current transducer (III) secondary side connects bridge rectifier filter circuit (1); the output of bridge rectifier filter circuit (1) connects voltage stabilizing circuit (2); the charging circuit of battery (4) connects rechargeable battery (3); signal processing circuit (V) is by error correction unit (5); integral unit (6); A/D converting unit (7); CPU element (8) is formed; the serial output signal of CPU element (8) connects electrical to optical converter (VI), carries out carrier modulation in electrical to optical converter.
Compared with prior art, advantage of the present utility model is:
1, the utility model does not adopt the mode of laser energy supply to the high-pressure side circuit supply, but by adopting traditional electromagnetic current transducer, come on high-tension side signal processing circuit (V), electrical to optical converter (VI) power supply through current rectifying and wave filtering circuit, voltage stabilizing circuit, big fluctuation does not appear in secondary side voltage under overcurrent and the short trouble situation by remaining in secondary side piezo-resistance in parallel, switches to by rechargeable battery under the very little situation of power network current and powers.
2, add the error correction unit (5) that the operational amplification circuit be made up of high precision operating amplifier and precision resistance is formed in the signal processing unit (V) of the utility model behind capacitor voltage divider (I), can reduce by electric capacity foozle and measure error that distributed capacitance causes, thereby improve measuring accuracy.
Description of drawings
Fig. 1 is the each several part annexation schematic diagram of active formula Fiber-Optic Voltage of the present utility model;
Fig. 2 is the each several part annexation schematic diagram of active formula optical fiber current mutual inductor of the present utility model;
Fig. 3 is the formation of the power supply circuit (IV) of active formula optical-fibre voltage current transformer of the present utility model;
Fig. 4 is the formation of the signal processing circuit (V) of active formula optical-fibre voltage current transformer of the present utility model;
Embodiment
The each several part annexation of active formula Fiber-Optic Voltage of the present utility model as shown in Figure 1; (I) carries out dividing potential drop to line voltage by capacitor voltage divider; obtain the alternating voltage of the amplitude of direct ratio and line voltage less than signal processing circuit (V) supply power voltage; because the foozle and the distributed capacitance of electric capacity; the influence of stray capacitance; can make its output voltage depart from ideal value and error occur; this error can be proofreaied and correct by the error correction unit (5) of signal processing circuit (V); the output of error correction unit (5) is handled by CPU element (8) after A/D converting unit (7); serial port by CPU is exported corresponding pulse according to the communication protocol of photo-electricity mutual-inductor; these pulses carry out carrier modulation by electrical to optical converter (VI) after optical fiber is sent to the optical-electrical converter (VIII) in control room; carry out after the demodulation output by optical-electrical converter (VIII) and satisfy relaying protection and power measurement desired signal, on high-tension side signal processing circuit (V); the power supply of electrical to optical converter (VI) is realized by the electromagnetic current transducer (III) and the power circuit (IV) of secondary side piezo-resistance in parallel.
As shown in Figure 2; what Rogowski coil (II) secondary side was exported is the voltage signal that is directly proportional with the differential of primary current; this signal becomes the voltage signal that is directly proportional with primary current behind the integral unit (6) of signal processing circuit (V); the output of integral unit (6) is handled by CPU element (8) after A/D converting unit (7); serial port by CPU is exported corresponding pulse according to the communication protocol of photo-electricity mutual-inductor; these pulses carry out carrier modulation by electrical to optical converter (VI) after optical fiber is sent to the optical-electrical converter (VIII) in control room; carry out after the demodulation output by optical-electrical converter (VIII) and satisfy relaying protection and power measurement desired signal, on high-tension side signal processing circuit (V); the power supply of electrical to optical converter (VI) is realized by the electromagnetic current transducer (III) and the power circuit (IV) of secondary side piezo-resistance in parallel.
As shown in Figure 3, electromagnetic current transducer (III) the secondary side joint bridge rectifier filter circuit (1) of secondary side piezo-resistance in parallel, because the pressure limiting effect of piezo-resistance, direct voltage by bridge rectifier filter circuit (1) output under primary side short circuit and overcurrent condition big fluctuation can not occur, the output of bridge rectifier filter circuit (1) connects voltage stabilizing circuit (2), this voltage stabilizing circuit (2) adopts three terminal regulator, consider that a power network current has big fluctuation, can adopt multistage three-terminal voltage-stabilizing, to guarantee that voltage stabilizing circuit (2) can both provide normal supply power voltage in a big fluctuation range, the direct voltage of bridge rectifier filter circuit when power network current is very little (1) output may be lower than signal processing circuit (V), the supply voltage requirement of electrical to optical converter (VI), at this moment automatically switch to the pattern by rechargeable battery (3) power supply, the charging of rechargeable battery (3) is finished through the charging circuit (4) of battery by the direct voltage of current rectifying and wave filtering circuit (1) output.
As shown in Figure 4, signal processing circuit (V) is by error correction unit (5), integral unit (6), A/D converting unit (7), CPU element (8) is formed, error correction unit (5) is made up of the operational amplification circuit that adopts high precision operating amplifier and precision resistance to form, its output is the accurate desired voltage signal that is directly proportional with capacitor voltage divider (I) input voltage through overcorrect, integral unit adopts the active integrating circuit of high accuracy to realize, its output is the voltage signal that is directly proportional with primary current, these signals are handled by CPU element (8) after A/D converting unit (7), are exported with the form of pulse by the serial port of CPU.
Claims (4)
1; a kind of active formula optical-fibre voltage current transformer; it is characterized in that this instrument transformer is by capacitor voltage divider (I); Rogowski coil (II); the electromagnetic current transducer (III) of secondary side piezo-resistance in parallel; power circuit (IV); signal processing circuit (V); electrical to optical converter (VI); optical fiber (VII); optical-electrical converter (VIII) is formed; the output signal of capacitor voltage divider (I) connects signal processing circuit (V); the output of signal processing circuit (V) constitutes Fiber-Optic Voltage through electrical to optical converter (VI) after optical fiber (VII) reaches optical-electrical converter (VIII); the output signal of Rogowski coil (II) connects signal processing circuit (V); the output of signal processing circuit (V) constitutes optical fiber current mutual inductor through electrical to optical converter (VI) after optical fiber (VII) reaches optical-electrical converter (VIII); optical-electrical converter output is used for protection and power measurement desired signal; the output of the electromagnetic current transducer (III) of secondary side piezo-resistance in parallel connects power circuit (IV), and signal processing circuit (V) is powered by power circuit (IV) with electrical to optical converter (VI).
2, active formula optical-fibre voltage current transformer as claimed in claim 1, electromagnetic current transducer (III) secondary side that it is characterized in that its secondary side piezo-resistance in parallel has centre tap or is made up of a plurality of windings, and the output of winding connects power circuit (IV).
3, active formula optical-fibre voltage current transformer as claimed in claim 1, it is characterized in that its power circuit (IV) is made up of the charging circuit (4) of bridge rectifier filter circuit (1), voltage stabilizing circuit (2), rechargeable battery (3), battery, electromagnetic current transducer (III) the secondary output of secondary side piezo-resistance in parallel connects bridge rectifier filter circuit (1), the output of bridge rectifier filter circuit (1) connects voltage stabilizing circuit (2), and the charging circuit of battery (4) connects rechargeable battery (3).
4, active formula optical-fibre voltage current transformer as claimed in claim 1, it is characterized in that its signal processing circuit (V) is by error correction unit (5), integral unit (6), A/D converting unit (7), CPU element (8) are formed, and the output of CPU element (8) connects electrical to optical converter (VI).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620032259 CN2911909Y (en) | 2006-06-09 | 2006-06-09 | Active opticalfiber voltage/current metual-inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620032259 CN2911909Y (en) | 2006-06-09 | 2006-06-09 | Active opticalfiber voltage/current metual-inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2911909Y true CN2911909Y (en) | 2007-06-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620032259 Expired - Fee Related CN2911909Y (en) | 2006-06-09 | 2006-06-09 | Active opticalfiber voltage/current metual-inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2911909Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521104B (en) * | 2008-11-19 | 2011-06-29 | 南瑞航天（北京）电气控制技术有限公司 | Full optical fiber current transformer adopting double closed loop control |
| CN112034229A (en) * | 2020-09-08 | 2020-12-04 | 东南大学 | All-fiber voltage transformer |
-
2006
- 2006-06-09 CN CN 200620032259 patent/CN2911909Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521104B (en) * | 2008-11-19 | 2011-06-29 | 南瑞航天（北京）电气控制技术有限公司 | Full optical fiber current transformer adopting double closed loop control |
| CN112034229A (en) * | 2020-09-08 | 2020-12-04 | 东南大学 | All-fiber voltage transformer |
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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 |