CN104965122B - Temperature self-compensation type optical voltage measuring device based on ring electric field coupled structure - Google Patents
Temperature self-compensation type optical voltage measuring device based on ring electric field coupled structure Download PDFInfo
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- CN104965122B CN104965122B CN201510422114.XA CN201510422114A CN104965122B CN 104965122 B CN104965122 B CN 104965122B CN 201510422114 A CN201510422114 A CN 201510422114A CN 104965122 B CN104965122 B CN 104965122B
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Abstract
Temperature self-compensation type optical voltage measuring device based on ring electric field coupled structure, the wire of high-pressure side one time are placed in metallic shield with semimetal ring group into high pressure lateral capacitance, semimetal ring, filling SF in the metallic shield6Insulating gas, the high pressure lateral capacitance are connected with low-pressure side derided capacitors, low-pressure side derided capacitors end connecting earthing device, low-pressure side derided capacitors both ends parallel connection optical voltage sensing head.ASE light sources connect former optical voltage sensing light path, reference path respectively by two optical fiber.Present invention high sensitivity, linearity when measuring high voltage is preferable；Simultaneously can be in voltage measure in real time, the automatic influence for eliminating the factors such as temperature change so that measurement result is more accurate.
Description
Technical field
A kind of temperature self-compensation type optical voltage measuring device based on ring electric field coupled structure of the present invention, is related to electricity
Force system fields of measurement.
Background technology
With being continuously increased for the development of power network, the adjustment of energy resource structure and new energy power generation technology, traditional power network is
It is difficult to the demand for development for meeting following power network.For this there has been proposed the concept of intelligent grid, to make up many of traditional power network
Deficiency.The primary feature of one of intelligent grid is exactly to realize real-time accurate measurements and the transmission of electrical network parameter, to carry out flexibly
Control, ensure the operation of power grid security economy.
For parameters such as the voltage of accurate, reliable measurement power system, electric currents, the measuring apparatus of power system is proposed
Higher requirement, therefore, conventional electromagnetic transformer have been difficult to meet power system on-line monitoring, intelligent, digitized
Growth requirement.And compared to traditional electromagnetic potential transformer, optical voltage transformer, which has, adapts to modernization digital measurement
It is required that the characteristics of.At present using it is more be using the optical voltage transformer of the wave plate of λ/4, but in the feelings of many high voltage measurings
In condition, grid voltage change is simultaneously little, and tested voltage signal remains at particular voltage level and nearby fluctuates (load voltage value
Between 85%-115%), a kind of optical voltage transformer without using the wave plate of λ/4 is designed for this feature, is allowed to structure
It is simpler, and there is higher reliability, sensitivity and practicality.
The optical voltage transformer to put into operation at present, high-pressure side use series capacitance partial pressure mostly, and this requires series capacitance
Good pressure-resistant performance is, it is necessary to which many electric capacity connection in series-parallel, series capacitance partial-pressure structure are vulnerable to parasitic capacitance in normal work
Influence, at the same electric capacity also can the aging with usage time, cause precision not high.Therefore, using SF6Gas isolated ring electric field
Coupled structure, insulating properties are more preferable, and partial pressure unit is also more simple.
Research shows in actual applications, temperature be influence Stability of OPT and accuracy it is main because
Element, for the temperature drift problems of optical voltage transformer, some researchers propose the side measured using comparison expression at present
Formula, i.e., it is corrected using correcting output of the sensor to measurement sensor, improves accuracy of measurement.But correction sensor is same
Be present temperature drift in sample, can also be influenceed by variation of ambient temperature, can not effectively solve the problems, such as temperature drift.
The content of the invention
For current optical voltage measuring device, existing optical crystal is easily affected by temperature in actual applications, high-pressure side
Series capacitance partial pressure is vulnerable to the problems such as influence of parasitic capacitance, and the present invention provides a kind of temperature based on ring electric field coupled structure
Degree automatic compensating optical voltage measuring device, the high sensitivity when measuring high voltage, the linearity are preferable；Simultaneously can be real in voltage
When measurement in, the automatic influence for eliminating the factors such as temperature change so that measurement result is more accurate.
The technical solution adopted in the present invention is：
Temperature self-compensation type optical voltage measuring device based on ring electric field coupled structure, the wire of high-pressure side one time with
Semimetal ring group is placed in metallic shield into high pressure lateral capacitance, semimetal ring, filling SF in the metallic shield6Insulate gas
Body, the high pressure lateral capacitance are connected with low-pressure side derided capacitors, low-pressure side derided capacitors end connecting earthing device, low-pressure side point
Voltage capacitance both ends parallel connection optical voltage sensing head.
ASE light sources connect former optical voltage sensing light path, reference path respectively by two optical fiber；Former optical voltage sensing light
Road includes what is be sequentially connected：First collimation lens, first polarizer, optical voltage sensing head, the first analyzer.
Reference path includes what is be sequentially connected：Second collimation lens, second polarizer, BGO crystal, the second analyzer.
BGO crystal connects reference voltage source, reference voltage source connection high frequency voltage harvester, high frequency voltage harvester
Connect terminal data processing device.First analyzer, the second analyzer connect terminal by photoelectric signal conversion device
Data processing equipment.
Voltage on the BGO crystal is provided by reference voltage source, meanwhile, high frequency voltage harvester constantly will be each
The magnitude of voltage of reference voltage source in individual acquisition time section is sent to data/address bus, data/address bus connection terminal data processing dress
Put.
The terminal data processing device is industrial computer or notebook computer.
The voltage measurement method of temperature self-compensation type optical voltage measuring device based on ring electric field coupled structure, institute
The linearly polarized light in former optical voltage sensing light path is stated under sub-high pressure effect, is produced in optical voltage sensing head two-fold
Penetrate；Birefringence equally occurs in the presence of reference voltage source for the linearly polarized light of reference path；Two bunch polarised lights pass through respectively
Two identical optical fiber are transferred in photoelectric signal conversion device, and photoelectric signal conversion device converts optical signal into telecommunications
Number, it is sent in data/address bus, the data most collected at last are transported in terminal data processing device by USB line and counted
Calculate, final realize is compensated the dynamic that temperature influences.
A kind of temperature self-compensation type optical voltage measuring device based on ring electric field coupled structure of the present invention, technology effect
Fruit is as follows：
1), in sensor-based system, due to not using the wave plate of λ/4, light channel structure is simple, and device is reduced, installation and make it is difficult
Degree reduces, and reduces the destabilizing factor that all parts may introduce, therefore improves reliability and stability, and when input
Voltage (measured high voltage) is(VΩFor the half-wave voltage of BGO crystal), measurement apparatus has peak response.
2), by being gathered to the high frequency voltage of reference voltage source, terminal data processing device quick sensing external world ring is utilized
The change of the conditions such as border temperature, and automatic calibration parameter makes whole measurement apparatus realize to temperature to measure virtual voltage size
The dynamic compensation of influence.
3), the wire of the high-pressure side of high-tension measurement part one time and semimetal ring group instead of biography into high-pressure side derided capacitors
The situation of multiple series capacitance partial pressures of system, solves the problems, such as parasitic capacitance, insulating properties are more preferable, and partial pressure unit is also more simple
It is single.Metallic shield shielding outside voltage circuit makes measurement result more accurate for the electromagnetic interference of measurement circuitry, and in it
Portion is filled with SF6Gas realizes insulation.The influence of parasitic capacitance can effectively be overcome, series capacitance is overcome and make difficult, insulation difficulty etc.
Problem, ring electric field coupled structure insulating properties are more preferable, 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 the ripple of λ/4
Piece, the reliability of voltage transformer is improved, enhance the ability of environment resistant factor interference, and when operating voltage is(VΩ
For the half-wave voltage of BGO crystal) when, measurement apparatus has optimum sensitivity.For conventional light path, wave plate, structure are not contained
It is simpler, and there is higher reliability, sensitivity and practicality.Actually measurement it is specific it is high-tension during, profit
Calculated with the Jones matrix of crystal Jones matrix and Pockels effects, will by designing suitable BGO crystal parameters
Operating point corresponding to rated voltage is chosen at (for the half-wave voltage of BGO crystal) place, and now measurement apparatus has highest sensitive
Degree and the degree of accuracy.
5) voltage, is measured relative to traditional optical voltage transformer, the present invention in sensor-based system by adding closed loop
Control, realize and the dynamic that temperature influences is compensated, eliminate the influence of whole measurement apparatus temperature drift.In measurement process, it is desirable to
Collimation lens in former optical voltage sensing light path and reference path, the polarizer, BGO crystal, material is complete used in analyzer
Exactly the same, size is identical.In the presence of reference voltage source and high frequency voltage harvester, at terminal data
Manage device, the automatic correcting variable parameter of change that can be for temperature, to cause measurement more accurate.
6), the line of high-tension measurement part and automatic correction portion conveying light source uses optical fiber, and optical fiber transmits anti-interference
Ability is strong, and the degree of accuracy of signal transmission is ensure that in substation field, reduce due to the bit error rate caused by electromagnetic interference and
Frame losing phenomenon.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the optical voltage sensing and data handling system structural representation of the present invention.
Embodiment
As shown in Figure 1 and Figure 2, the temperature self-compensation type optical voltage measuring device based on ring electric field coupled structure, bag
Include high-tension measurement part, sensing and data processing section.
As shown in figure 1, high-tension measurement part：
The wire 1 of high-pressure side one time constitutes high-tension electricity side ring shape field coupling structure with semimetal ring 2, as high-pressure side electricity
Hold, semimetal ring 2 is placed in metallic shield 3, filling SF in the metallic shield 36Insulating gas is insulated.The height
Pressure lateral capacitance is connected partial pressure with low-pressure side derided capacitors 4, the end connecting earthing device 6 of low-pressure side derided capacitors 4, low-pressure side partial pressure
The both ends parallel connection optical voltage sensing head 5 of electric capacity 4, the optical voltage sensing head 5 are the BGO in former optical voltage sensing light path
Crystal.
As shown in Fig. 2 sensing and data processing section：
ASE light sources 7 connect former optical voltage sensing light path, reference path respectively by two optical fiber.Former optical voltage sensing
Light path includes what is be sequentially connected：First collimation lens 8, first polarizer 9, optical voltage sensing head 5, the first analyzer 11.
Reference path includes what is be sequentially connected：Second collimation lens 8 ', second polarizer 9 ', BGO crystal 10, the second analyzing
Device 11 '.BGO crystal 10 connects reference voltage source 12, and reference voltage source 12 connects high frequency voltage harvester 13, and high frequency voltage is adopted
Acquisition means 13 connect terminal data processing device 15.First analyzer 11, the second analyzer 11 ' are turned by photosignal
Changing device 14 connects terminal data processing device 15.
Voltage on the BGO crystal 10 is provided by reference voltage source 12, and reference voltage source 12 uses 220V power-frequency voltages
Source.Meanwhile high frequency voltage harvester 13 constantly passes the magnitude of voltage of the reference voltage source 12 in each acquisition time section
It is sent to data/address bus, data/address bus connection terminal data processing device 15.
Linearly polarized light in the former optical voltage sensing light path is under sub-high pressure effect, in optical voltage sensing head 5
Middle generation birefringence；Birefringence equally occurs in the presence of reference voltage source 12 for the linearly polarized light of reference path.Two bunch are inclined
The light that shakes is transferred in photoelectric signal conversion device 14 by two identical optical fiber respectively, and photoelectric signal conversion device 14 is adopted
The photoelectric signal converters of model JetCon 1301.Photoelectric signal conversion device 14 converts optical signal into electric signal, send
To in data/address bus, the data that are most collected at last are transported in terminal data processing device 15 by USB line to be calculated,
Final realize is compensated the dynamic that temperature influences.
The terminal data processing device 15 is industrial computer or notebook computer.
, it is necessary to ensure former optical voltage sensing light path, reference path in measurement process：
Material used in first collimation lens 8, the second collimation lens 8 ' is identical, and size is identical.
Material used in first polarizer 9, second polarizer 9 ' is identical with size；First analyzer 11, second
Material is identical used in analyzer 11 ', and size is identical.The model ZLM- that the polarizer and analyzer use
PZP-24Y types, while there is the function being polarized with analyzing.
Material used in optical voltage sensing head 5, BGO crystal 10 is identical with size, using Bi4Ge3O12Make
Form.
As a result of one and the former identical reference path of optical voltage sensing light path (correction unit), measuring
During on high-tension side magnitude of voltage size, while also measuring basis voltage source 12, two groups of voltage datas of measurement are sent into terminal data
Processing unit 15, the size of any time system sensitivity and initial error can be measured, because the two parameters are with temperature
What degree changed and changed, when the system sensitivity and the size of initial error that calculate any time, pass through the electricity measured this moment
Pressure, the busbar voltage size with regard to that can calculate any time thoroughly eliminate influence of the temperature for optic probe, and the present invention is overall
Realize and the dynamic that temperature influences is compensated, solve effect of parasitic capacitance in the case of traditional multiple series capacitance partial pressures
Problem, insulating properties are more preferable, and partial pressure unit is also more simple, while this method also there are all optical voltage measuring devices to be had
The advantages of having, such as：Dynamic range is big, security performance is high, exportable data signal etc..
Claims (3)
1. the temperature self-compensation type optical voltage measuring device based on ring electric field coupled structure, it is characterised in that high-pressure side
Wire（1）With semimetal ring（2）Form high pressure lateral capacitance, semimetal ring（2）It is placed on metallic shield（3）It is interior, the gold
Belong to radome（3）Interior filling SF6 insulating gas, the high pressure lateral capacitance and low-pressure side derided capacitors（4）Series connection, low-pressure side partial pressure
Electric capacity（4）End connecting earthing device（6）, low-pressure side derided capacitors（4）Both ends parallel connection optical voltage sensing head（5）；
ASE light sources（7）Former optical voltage sensing light path, reference path are connected respectively by two optical fiber；
Former optical voltage sensing light path includes what is be sequentially connected：First collimation lens（8）, first polarizer（9）, optical voltage pass
Feel head（5）, the first analyzer（11）；
Reference path includes what is be sequentially connected：Second collimation lens（8’）, second polarizer（9’）, BGO crystal（10）, second inspection
Inclined device（11’）；
BGO crystal（10）Connect reference voltage source（12）, reference voltage source（12）Connect high frequency voltage harvester（13）, high frequency
Voltage collecting device（13）Connect terminal data processing device（15）；
First analyzer（11）, the second analyzer（11’）Pass through photoelectric signal conversion device（14）Connect terminal data
Processing unit（15）；
The device uses reference path, when measuring on high-tension side magnitude of voltage size, while also measuring basis voltage source（12）, will
Two groups of voltage datas of measurement are sent into terminal data processing device（15）, any time system sensitivity and initial error can be measured
Size, because the two parameters change with temperature change, when the system sensitivity for calculating any time and just
The size of beginning error, pass through the voltage measured this moment, you can calculate the busbar voltage size of any time.
2. the temperature self-compensation type optical voltage measuring device based on ring electric field coupled structure according to claim 1,
Characterized in that, the BGO crystal（10）On voltage by reference voltage source（12）There is provided, while high frequency voltage harvester
（13）Constantly by the reference voltage source in each acquisition time section（12）Magnitude of voltage, be sent to data/address bus, data are total
Line connects terminal data processing device（15）, terminal data processing device（15）For industrial computer or notebook computer.
3. using the temperature self-compensation type optical voltage measuring based on ring electric field coupled structure as claimed in claim 1 or 2
The voltage measurement method of device, it is characterised in that the linearly polarized light in the former optical voltage sensing light path is made in a sub-high pressure
Under, in optical voltage sensing head（5）Middle generation birefringence；The linearly polarized light of reference path is in reference voltage source（12）Effect
Lower same generation birefringence；Two bunch polarised lights are transferred to photoelectric signal conversion device by two identical optical fiber respectively
（14）In, photoelectric signal conversion device（14）Electric signal is converted optical signal into, is sent in data/address bus, is most collected at last
Data terminal data processing device is transported to by USB line（15）In calculated, it is final to realize the dynamic influenceed on temperature
Compensation.
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| CN106842098A (en) * | 2017-02-22 | 2017-06-13 | 国网甘肃省电力公司金昌供电公司 | A kind of voltage sensor of suitable substation field measurement |
| CN106970268B (en) * | 2017-02-28 | 2019-07-16 | 上海交通大学 | Single-phase overhead transmission line of electricity phase voltage method for self-calibrating based on shunt capacitance |
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