CN204731311U - Based on the temperature self-compensation type optical voltage measuring device of ring electric field coupled structure - Google Patents
Based on the temperature self-compensation type optical voltage measuring device of ring electric field coupled structure Download PDFInfo
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- CN204731311U CN204731311U CN201520521455.8U CN201520521455U CN204731311U CN 204731311 U CN204731311 U CN 204731311U CN 201520521455 U CN201520521455 U CN 201520521455U CN 204731311 U CN204731311 U CN 204731311U
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Abstract
Based on the temperature self-compensation type optical voltage measuring device of ring electric field coupled structure, one time, high-pressure side wire and semimetal ring form high-pressure side electric capacity, and semimetal ring is placed in metallic shield, fill SF in described metallic shield
6insulating gas, described high-pressure side electric capacity is connected with low-pressure side derided capacitors, low-pressure side derided capacitors end connecting earthing device, low-pressure side derided capacitors two ends optical voltage sensing head in parallel.ASE light source connects former optical voltage sensing light path, reference path respectively by two optical fiber.The utility model is highly sensitive when measuring high voltage, and the linearity is better; In voltage is measured in real time, automatically can eliminate the impact of the factors such as temperature variation, make measurement result more accurate simultaneously.
Description
Technical field
A kind of temperature self-compensation type optical voltage measuring device based on ring electric field coupled structure of the utility model, relates to power system measuring field.
Background technology
Along with the continuous increase of the development of electrical network, the adjustment of energy structure and generation of electricity by new energy technology, traditional electrical network has been difficult to the demand for development of satisfied following electrical network.There has been proposed the concept of intelligent grid, to make up many deficiencies of traditional electrical network for this reason.A primary feature of intelligent grid is exactly the real-time accurate measurements and the transmission that realize electrical network parameter, controls flexibly to carry out, and ensures the operation of power grid security economy.
In order to the parameter such as voltage, electric current that is accurate, that measure electric system reliably, have higher requirement to the measuring equipment of electric system, therefore, conventional electromagnetic mutual inductor has been difficult to meet electric system on-line monitoring, intellectuality, digitized growth requirement.And compared to traditional electromagnetic potential transformer, optical voltage transformer has the advantages that to adapt to the requirement of modernization digital measurement.What current application was more is the optical voltage transformer adopting λ/4 wave plate, but when a lot of high voltage measuring, grid voltage change is also little, tested voltage signal remains at fluctuation (between the 85%-115% of load voltage value) near at particular voltage level, a kind of optical voltage transformer not using λ/4 wave plate is designed for this feature, make it structure more simple, and there is higher reliability, sensitivity and practicality.
The optical voltage transformer put into operation at present, high-pressure side adopts series capacitance dividing potential drop mostly, this requires the good pressure-resistant performance of series capacitance, need a lot of electric capacity connection in series-parallel, series capacitance partial-pressure structure is vulnerable to the impact of stray capacitance when normal work, electric capacity also can be aging with service time simultaneously, causes precision not high.Therefore, SF is adopted
6gas isolated ring electric field coupled structure, insulating property are better, and partial pressure unit is also more simple.
Research shows in actual applications, temperature is the principal element affecting Stability of OPT and accuracy, for the temperature drift problems of optical voltage transformer, some researchist proposes the mode adopting comparison expression to measure at present, namely utilize the output of correcting sensor to survey sensor to correct, improve accuracy of measurement.But correcting sensor exists warm drift problem equally, also can be subject to the impact of variation of ambient temperature, warm drift problem effectively cannot be solved.
Summary of the invention
For the easy temperature influence of optical crystal that current optical voltage measuring device exists in actual applications, high-pressure side series capacitance dividing potential drop is vulnerable to the problems such as the impact of stray capacitance, the utility model provides a kind of temperature self-compensation type optical voltage measuring device based on ring electric field coupled structure, highly sensitive when measuring high voltage, the linearity is better; In voltage is measured in real time, automatically can eliminate the impact of the factors such as temperature variation, make measurement result more accurate simultaneously.
The technical scheme that the utility model adopts is:
Based on the temperature self-compensation type optical voltage measuring device of ring electric field coupled structure, one time, high-pressure side wire and semimetal ring form high-pressure side electric capacity, and semimetal ring is placed in metallic shield, fill SF in described metallic shield
6insulating gas, described high-pressure side electric capacity is connected with low-pressure side derided capacitors, low-pressure side derided capacitors end connecting earthing device, low-pressure side derided capacitors two ends optical voltage sensing head in parallel.
ASE light source connects former optical voltage sensing light path, reference path respectively by two optical fiber; Former optical voltage sensing light path comprises and connecting successively: the first collimation lens, first polarizer, optical voltage sensing head, the first analyzer.
Reference path comprises and connecting successively: the second collimation lens, second polarizer, BGO crystal, the second analyzer.
BGO crystal connects reference voltage source, and reference voltage source connects HF voltage harvester, and HF voltage harvester connects terminal data processing device.Described first analyzer, the second analyzer all connect terminal data processing device by photoelectric signal conversion device.
Voltage on described BGO crystal is provided by reference voltage source, and meanwhile, the magnitude of voltage of the reference voltage source in each acquisition time section is constantly sent to data bus by HF voltage harvester, and data bus connects terminal data processing device.
Described terminal data processing device is industrial computer or notebook computer.
Based on the voltage measurement method of the temperature self-compensation type optical voltage measuring device of ring electric field coupled structure, the linearly polarized light in described former optical voltage sensing light path, under a High Pressure, produces birefringence in optical voltage sensing head; Birefringence is there is equally in the linearly polarized light of reference path under the effect of reference voltage source; Two bunch polarized lights respectively by two identical Optical Fiber Transmission in photoelectric signal conversion device, light signal is converted into electric signal by photoelectric signal conversion device, deliver in data bus, data collected the most at last are transported in terminal data processing device by USB line and calculate, the final dynamic compensation realized temperature impact.
A kind of temperature self-compensation type optical voltage measuring device based on ring electric field coupled structure of the utility model, technique effect is as follows:
1), in sensor-based system, owing to not adopting λ/4 wave plate, light channel structure is simple, device reduces, install and manufacture difficulty reduction, decrease the labile factor that all parts may be introduced, therefore improve reliability and stability, and when input voltage (measured high voltage) is
(V
Ωhalf-wave voltage for BGO crystal), measurement mechanism has peak response.
2), by the HF voltage collection to reference voltage source, utilize the change of the conditions such as terminal data processing device quick sensing ambient temperature, and automatic calibration parameter is to measure virtual voltage size, whole measurement mechanism is made to realize the dynamic compensation affected temperature.
3), one time, the high-pressure side wire of high-tension measurement part and semimetal ring form high-pressure side derided capacitors, and instead of the situation of traditional multiple series capacitance dividing potential drops, solve the problem of stray capacitance, insulating property are better, and partial pressure unit is also more simple.Metallic shield shielding outside voltage circuit, for the electromagnetic interference (EMI) of measuring circuit, make measurement result more accurate, and its inside is filled with SF
6gas realizes insulation.Effectively can overcome the impact of stray capacitance, overcome series capacitance and make the problems such as difficult, insulation difficulty, ring electric field coupled structure insulating property are better, and partial pressure unit is also more simple.
4), sensing and data processing section, compared with traditional optical voltage transformer structure, due to not containing λ/4 wave plate, improve the reliability of voltage transformer (VT), enhance the ability of environment resistant factor interference, and when operating voltage is
(V
Ωhalf-wave voltage for BGO crystal) time, measurement mechanism has optimum sensitivity.For conventional light path, not containing wave plate, structure is more simple, and has higher reliability, sensitivity and practicality.In the specific high-tension process of actual measurement, the Jones matrix of crystal Jones matrix and Pockels effect is utilized to calculate, by designing suitable BGO crystal parameter, working point corresponding for rated voltage is chosen at (half-wave voltage for BGO crystal) place, now measurement mechanism has the highest sensitivity and accuracy.
5), relative to traditional optical voltage transformer measuring voltage, the utility model, by adding closed-loop control in sensor-based system, realizes the dynamic compensation on temperature impact, eliminates the impact of whole measurement mechanism temperature drift.In measuring process, require the collimation lens in former optical voltage sensing light path and reference path, the material that the polarizer, BGO crystal, analyzer use is identical, and size is identical.Under the effect of reference voltage source and HF voltage harvester, by terminal data processing device, can for the change automatic calibration variable parameter of temperature, more accurate to make to measure.
6), the line of high-tension measurement part and automatic calibration part conveying light source all adopts optical fiber, and the antijamming capability of Optical Fiber Transmission is strong, ensure that the accuracy of Signal transmissions, reduce the bit error rate because electromagnetic interference (EMI) causes and frame losing phenomenon in substation field.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is optical voltage sensing of the present utility model and data handling system structural representation.
Embodiment
As shown in Figure 1 and Figure 2, based on the temperature self-compensation type optical voltage measuring device of ring electric field coupled structure, high-tension measurement part, sensing and data processing section is comprised.
As shown in Figure 1, high-tension measurement part:
One time, high-pressure side wire 1 and semimetal ring 2 constitute high-tension electricity side ring shape field coupled structure, and as high-pressure side electric capacity, semimetal ring 2 is placed in metallic shield 3, fill SF in described metallic shield 3
6insulating gas insulate.Described high-pressure side electric capacity is connected with low-pressure side derided capacitors 4 dividing potential drop, low-pressure side derided capacitors 4 end connecting earthing device 6, low-pressure side derided capacitors 4 two ends optical voltage sensing head 5 in parallel, described optical voltage sensing head 5 is the BGO crystal in former optical voltage sensing light path.
As shown in Figure 2, sensing and data processing section:
ASE light source 7 connects former optical voltage sensing light path, reference path respectively by two optical fiber.Former optical voltage sensing light path comprises and connecting successively: first collimation lens 8, first polarizer 9, optical voltage sensing head 5, first analyzer 11.
Reference path comprises and connecting successively: the second collimation lens 8 ', second polarizer 9 ', BGO crystal 10, second analyzer 11 '.BGO crystal 10 connects reference voltage source 12, and reference voltage source 12 connects HF voltage harvester 13, and HF voltage harvester 13 connects terminal data processing device 15.Described first analyzer 11, second analyzer 11 ' all connects terminal data processing device 15 by photoelectric signal conversion device 14.
Voltage on described BGO crystal 10 is provided by reference voltage source 12, and reference voltage source 12 adopts 220V power frequency electric potential source.Meanwhile, the magnitude of voltage of the reference voltage source 12 in each acquisition time section is constantly sent to data bus by HF voltage harvester 13, and data bus connects terminal data processing device 15.
Linearly polarized light in described former optical voltage sensing light path, under a High Pressure, produces birefringence in optical voltage sensing head 5; Birefringence is there is equally in the linearly polarized light of reference path under the effect of reference voltage source 12.Two bunch polarized lights are respectively by two identical Optical Fiber Transmission to photoelectric signal conversion device 14 li, and the model that photoelectric signal conversion device 14 adopts is JetCon 1301 photoelectric signal converter.Light signal is converted into electric signal by photoelectric signal conversion device 14, delivers in data bus, and data collected the most at last are transported in terminal data processing device 15 by USB line and calculate, the final dynamic compensation realized temperature impact.
Described terminal data processing device 15 is industrial computer or notebook computer.
In measuring process, need to ensure former optical voltage sensing light path, reference path:
The material that first collimation lens 8, second collimation lens 8 ' uses is identical, and size is identical.
The material that first polarizer 9, second polarizer 9 ' uses is identical with size; The material that first analyzer 11, second analyzer 11 ' uses is identical, and size is identical.The model that the polarizer and analyzer adopt is ZLM-PZP-24Y type, has had partially and the function of analyzing simultaneously.
The material that optical voltage sensing head 5, BGO crystal 10 use is identical with size, adopts Bi
4ge
3o
12be made.
Owing to have employed one and the identical reference path of former optical voltage sensing light path (correcting unit), when measuring on high-tension side magnitude of voltage size, simultaneously also measuring basis voltage source 12, the two groups of voltage datas measured are sent into terminal data processing device 15, any time system sensitivity and the size of initial error can be measured, because these two parameters change along with temperature variation, when the size of the system sensitivity and initial error that calculate any time, by the voltage measured this moment, just can calculate the busbar voltage size of any time, thorough elimination temperature is for the impact of optic probe, the utility model entirety achieves the dynamic compensation on temperature impact, solve the problem of effect of parasitic capacitance when traditional multiple series capacitance dividing potential drop, insulating property are better, partial pressure unit is also more simple, the method also has the advantage that all optical voltage measuring devices have simultaneously, such as: dynamic range is large, security performance is high, exportable digital signal etc.
Claims (3)
1., based on the temperature self-compensation type optical voltage measuring device of ring electric field coupled structure, it is characterized in that,
One time, high-pressure side wire (1) and semimetal ring (2) form high-pressure side electric capacity, and semimetal ring (2) is placed in metallic shield (3), fill SF in described metallic shield (3)
6insulating gas, described high-pressure side electric capacity is connected with low-pressure side derided capacitors (4), low-pressure side derided capacitors (4) end connecting earthing device (6), low-pressure side derided capacitors (4) two ends optical voltage sensing head (5) in parallel;
ASE light source (7) connects former optical voltage sensing light path, reference path respectively by two optical fiber;
Former optical voltage sensing light path comprises and connecting successively: the first collimation lens (8), first polarizer (9), optical voltage sensing head (5), the first analyzer (11);
Reference path comprises and connecting successively: the second collimation lens (8 '), second polarizer (9 '), BGO crystal (10), the second analyzer (11 ');
BGO crystal (10) connects reference voltage source (12), reference voltage source (12) connects HF voltage harvester (13), and HF voltage harvester (13) connects terminal data processing device (15);
Described first analyzer (11), the second analyzer (11 ') all connect terminal data processing device (15) by photoelectric signal conversion device (14).
2. according to claim 1 based on the temperature self-compensation type optical voltage measuring device of ring electric field coupled structure, it is characterized in that, voltage on described BGO crystal (10) is provided by reference voltage source (12), HF voltage harvester (13) is constantly by the magnitude of voltage of the reference voltage source (12) in each acquisition time section simultaneously, be sent to data bus, data bus connects terminal data processing device (15).
3. according to claim 1 or 2 based on the temperature self-compensation type optical voltage measuring device of ring electric field coupled structure, it is characterized in that, described terminal data processing device (15) is industrial computer or notebook computer.
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| CN201520521455.8U CN204731311U (en) | 2015-07-17 | 2015-07-17 | Based on the temperature self-compensation type optical voltage measuring device of ring electric field coupled structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104965122A (en) * | 2015-07-17 | 2015-10-07 | 三峡大学 | Automatic temperature compensation-type optical voltage measuring device based on circular electric field coupling structure |
| CN108732410A (en) * | 2018-06-04 | 2018-11-02 | 清大智能（北京）科技有限公司 | A kind of voltage measuring apparatus for distribution line |
-
2015
- 2015-07-17 CN CN201520521455.8U patent/CN204731311U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104965122A (en) * | 2015-07-17 | 2015-10-07 | 三峡大学 | Automatic temperature compensation-type optical voltage measuring device based on circular electric field coupling structure |
| CN104965122B (en) * | 2015-07-17 | 2018-03-13 | 三峡大学 | Temperature self-compensation type optical voltage measuring device based on ring electric field coupled structure |
| CN108732410A (en) * | 2018-06-04 | 2018-11-02 | 清大智能（北京）科技有限公司 | A kind of voltage measuring apparatus for distribution line |
| CN108732410B (en) * | 2018-06-04 | 2024-02-20 | 清大智能（北京）科技有限公司 | Voltage measuring device for distribution line |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151028 Termination date: 20160717 |