CN109765415A - A kind of current transformer with optical path - Google Patents
A kind of current transformer with optical path Download PDFInfo
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- CN109765415A CN109765415A CN201711098574.7A CN201711098574A CN109765415A CN 109765415 A CN109765415 A CN 109765415A CN 201711098574 A CN201711098574 A CN 201711098574A CN 109765415 A CN109765415 A CN 109765415A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 80
- 239000013307 optical fiber Substances 0.000 claims abstract description 48
- 239000000835 fiber Substances 0.000 claims abstract description 26
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 230000010287 polarization Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000004927 fusion Effects 0.000 description 3
- 208000037408 Device failure Diseases 0.000 description 2
- 208000025174 PANDAS Diseases 0.000 description 2
- 208000021155 Paediatric autoimmune neuropsychiatric disorders associated with streptococcal infection Diseases 0.000 description 2
- 240000004718 Panda Species 0.000 description 2
- 235000016496 Panda oleosa Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The present invention relates to technical field of optical fiber sensing, especially a kind of current transformer with optical path.The current transformer includes light source, first coupler, second coupler and photodetector, the first output end is provided on first coupler, the optical signal input and the input/output terminal, first input end is provided on second coupler, reflect light output end and reflected light test lead, first output end optical fiber connects first input end, reflected light test lead is for connecting reflection optical test set to test the reflected light optical signal, reflected light signal is divided into part of detecting and measurement part by the second coupler, when photodetector occurred without the phenomenon that output, it can directly be tested by reflecting optical test set, to judge photodetector whether failure, it solves in all-fiber electronic current transformer and is dismantled in the process fault detection of active device, disconnected fibre causes to detect not convenient and influence on mutual inductor light channel structure Larger problem.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, especially a kind of current transformer with optical path.
Background technique
It is the key that entire grid power transmission link institute that the electric current transmitted in power grid to it, which carries out accurately and rapidly measurement,
Wherein being referred to as current transformer to the equipment that electric current measures in electrical grid transmission.As the high speed of economic society is sent out
Exhibition, the demand to electric power are also increasingly increasing, and in particular with the continuous improvement of voltage class, conventional current mutual inductor is gradually shown
The limitation that it is applied is revealed, volume weight is big, there are magnetic saturation phenomenon, installation complexity etc..With full optical-fiber current
The generation of mutual inductor, is worldwide increasingly becoming the application of current transformer at the shortcomings that changing conventional current mutual inductor
Developing direction.But all-fiber current transformator obtains current information, and light channel structure since it uses pure light channel structure
In optical device between be all the single branch's closed loop configuration being welded together with optical fiber, once break down be difficult from outside identify
The source of trouble unless the disconnection of each optical device is carried out checking respectively for measuring, therefore carries out all-fiber current transformator quickly quasi-
The positioning of true failure is very necessary.And all-fiber current transformator is once made, and generally requires to carry out its light channel structure
Fixing process needs successively to dismantle optical path, this process wherein once breaking down and promptly and accurately cannot orient the source of trouble
The not only laborious new source of trouble time-consuming but also easy to breed.
All-fiber electronic current transformer light channel structure includes light source, coupler, the polarizer, phase-modulator, optical fiber
Ring, reflecting mirror, photodetector, signal processing unit etc. are sensed, wherein only light source and photodetector are active device, and
Remaining is passive device.The probability highest of the two device failures in practical applications, and once break down very
Difficult Judging fault source, traditional method are respectively by light source SLED is disconnected or photoelectric detector PD is connect with coupler optical fiber
The test for carrying out practical optical power is disconnected, such test method is extremely not convenient and easy in practical application so that entire mutual
The light channel structure of sensor is affected.
Summary of the invention
The object of the present invention is to provide a kind of current transformers with optical path, to solve all-fiber electronic current
It is dismantled in the process fault detection of active device in mutual inductor, disconnected fibre causes to detect not convenient and influence on mutual inductor light channel structure
Larger problem.
To achieve the above object, the present invention the following technical schemes are provided:
Scheme one: a kind of current transformer with optical path, including light source, photodetector and the first coupler, institute
It states and is provided with the first output end, optical signal input and input/output terminal on the first coupler；The light source passes through optical fiber output
The optical signal input is connected, the input/output terminal is for output optical signal and receives corresponding reflected light optical signal, institute
Stating current transformer further includes the second coupler, be provided on second coupler first input end, reflection light output end and
Reflected light test lead, the first output end optical fiber connect the first input end, and the reflection light output end optical fiber connects institute
Photodetector is stated, the reflected light test lead is for connecting reflection optical test set, to test the reflected light optical signal.
Beneficial effect, which is that reflected light signal is divided by this programme one by the second coupler of setting, is used to reflect optical tests
Part and for measurement part, photodetector occur without output the phenomenon that when, under the premise of not changing existing structure,
Directly the reflected light signal by reflected light test output terminal can be tested using reflection optical test set, to judge light
Electric explorer whether failure, solve in active device failure diagnostic process dismantle, disconnected fibre etc. is affected to light channel structure
Problem.
Scheme two: on the basis of scheme one, second output terminal is additionally provided on first coupler；Described second is defeated
Outlet optical fiber is for connecting test of light source device, to test the optical signal of the light source output.
Beneficial effect is that this programme two increases a second output terminal by the first coupler of setting, and the light of light source is believed
Number it is divided into the part for test of light source and the part for measurement, when photodetector occurred without the phenomenon that output, not
Under the premise of changing existing structure, it can be surveyed using test of light source device to by the light source optical signal of second output terminal
Examination, in conjunction with reflection optical test set as a result, to judge photodetector and light source whether failure.
Scheme three: on the basis of scheme one or scheme two, the current transformer further includes the polarizer, straight wave guide phase
Modulator, optical-fibre wave plate, Fibre Optical Sensor ring, reflecting mirror and signal processing apparatus；Believed by the light source light of the input/output terminal
The polarizer, the straight waveguide phase modulator, the optical-fibre wave plate and the optical fiber for number passing sequentially through optical fiber connection pass
It is returned after feeling ring through reflecting mirror reflection, the Fibre Optical Sensor ring is by the optical fiber between the optical-fibre wave plate and the reflecting mirror
It constitutes；The output end signal of the photodetector connects the input terminal of the signal processing apparatus, the signal processing apparatus
Output end signal connect the straight waveguide phase modulator.
Scheme four: on the basis of scheme three, the current transformer further includes host computer display processing unit, the letter
The output end signal of number processing unit connects the host computer display processing unit.
Scheme five: on the basis of scheme two or scheme four, the input/output terminal and the second output terminal are set
Splitting ratio is the first setting value.
Scheme six: on the basis of scheme one or scheme four, the reflection light output end and the reflection optical tests are set
The splitting ratio at end is the second setting value.
Scheme seven: on the basis of scheme six, second setting value is not less than 0.95.
Scheme eight: on the basis of scheme seven, the input/output structure that first coupler is 2 × 2, second coupling
The input/output structure that clutch is 1 × 2.
Scheme nine: on the basis of scheme two, the reflected light test lead passes through the connection reflection of the first optical fiber jumper terminal
Optical test set, the second output terminal connect test of light source device by the second optical fiber jumper terminal.
Scheme ten: on the basis of scheme nine, first optical fiber jumper terminal and second optical fiber jumper terminal are equal
For polarization maintaining optical fibre jumper terminal.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of current transformer with optical path of embodiment 1；
Fig. 2 is the schematic diagram of the first coupler of embodiment 1；
Fig. 3 is the schematic diagram of the second coupler of embodiment 1；
Fig. 4 is a kind of schematic diagram of current transformer with optical path of embodiment 2；
Fig. 5 is the schematic diagram of the first coupler of embodiment 2；
Fig. 6 is Coupler Module schematic diagram.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
Embodiment 1
The present embodiment 1 provides a kind of current transformer with optical path, as shown in Figure 1, including light source SLED1, first
Coupler 2, the polarizer 3,45 degree of fusion points 4, straight waveguide phase modulator 5, fibre delay line 6, optical-fibre wave plates 7, Fibre Optical Sensor
Ring 8, reflecting mirror 9, the second coupler 10, photodetector 11, signal processing apparatus 12 and host computer 13；Wherein, the first coupling
Device 2, as shown in Fig. 2, including optical signal input, input/output terminal and the first output end；Second coupler 10, as shown in figure 3,
Including first input end, reflection light output end and reflected light test lead.Preferred fiber wave plate 7 is optical fiber quarter-wave plate.
Light source SLED 1, to optical signal input, is coupled by the light source optical signal of optical fiber output by the first coupler 2
It is exported afterwards from input/output terminal, meanwhile, the first coupling is entered by input/output terminal through the reflected reflected light signal of optical path
It is exported after device 2 from the first output end.First output end connects first input end by optical fiber, and reflection light output end is connected by optical fiber
Photodetector 11 is connect, reflected light test lead is filled by adding the polarization maintaining optical fibre jumper terminal of molten panda type to connect reflection optical tests
It sets.
The output end of the polarizer 3 connects the input terminal of straight waveguide phase modulator 5, straight wave by 45 degree of 4 optical fiber of fusion point
The output end for leading phase-modulator 5 connects reflecting mirror 9 by one section of fibre delay line 6 and optical-fibre wave plate 7, wherein Fibre Optical Sensor ring
8 are made of the optical fiber between optical-fibre wave plate 7 and reflecting mirror 9, have the Primary Conductor of current-carrying to pass through among Fibre Optical Sensor ring 8；Photoelectricity
The input terminal of the output end signal connection signal processing unit 12 of detector 11, the output end signal connection of signal processing apparatus 12
Straight waveguide phase modulator 5 and host computer 13.
A kind of operative scenario for current transformer with optical path that the present embodiment 1 provides is as follows: light source SLED 1 is defeated
The light signal for setting component is transported to 3 turns of the polarizer by the input/output terminal of the first coupler 2 by low inclined scattering light out
It is changed to linearly polarized light, linearly polarized light is then divided into two mutually orthogonal X-component line polarisations and Y point by 45 degree of fusion points 4
Measure line polarisation；After the modulation that X-component line polarisation and Y-component line polarisation pass through straight waveguide phase modulator 5, pass through fibre delay line
X-component line polarisation and Y-component line polarisation further widened in phase by 6, through optical fiber quarter-wave plate by X points
The linearly polarized light of amount and the linearly polarized light of Y-component are converted to left-handed and right-circularly polarized light, by Fibre Optical Sensor ring 8 when
It waits, due to faraday's magnetic rotation effect, obtains the optical signal for being loaded with current-carrying Primary Conductor current information, it is anti-by reflecting mirror 9
After penetrating, transmitted along reverse optical path front end.
Reflected light is converted to two bunch polarised lights after passing through optical fiber quarter-wave plate, and the linearly polarized light of transmitting at this time is logical
It is interfered at the polarizer 3 after crossing fibre delay line 6, straight waveguide phase modulator 5, interference light signal at this time is to obtain
The optical signal of current information, the reflected light signal are sent into the of the second coupler 10 by the first output end of the first coupler 2
One input terminal respectively enters photodetector 11 and reflection through overcoupling light splitting from reflection light output end and reflected light test lead
Optical test set, to tested accordingly when the output of 11 no signal of photodetector reflected light signal, in turn
It may determine that whether photodetector 11 works normally.
Wherein, the second coupler 11 is the input/output structure of one kind 1 × 2, is reflected due to entering photodetector 11
Optical power signals it is general in several hundred microwatts, be directly used in follow-up signal processing analysis, it is therefore necessary to guarantee the second coupler 10
The light component for entering photodetector 11 by reflecting light output end is to enter reflection optical test set by reflected light test lead
Light component 95% or more.
Therefore, select one of output light element ports mutual to all-fiber electronic current in the second coupler 10
Reflected optical power in sensor optical path is measured in real time, the process that the disconnected fibre saved measures, and is visited once photoelectricity occurs
By being directly connected to quickly check failure when surveying device 11 without the phenomenon that output.
Reflected light signal is divided by the present embodiment 1 by the second coupler of setting to be used to reflect the part of optical tests and is used for
The part of measurement can directly be tested by reflected light part of detecting when photodetector occurred without the phenomenon that output, from
And judge photodetector whether failure.
Embodiment 2
There was only two active devices of light source SLED and photodetector in existing all-fiber electronic current transformer, and
Remaining is passive device, therefore the failure to light source SLED is also needed to check, on the basis of embodiment 1 the present embodiment
2 provide a kind of current transformer with optical path, as shown in figure 4, the first coupler 2 further includes a second output terminal, use
In carrying out light splitting output light source optical signal with input/output terminal, second output terminal is by adding the polarization maintaining optical fibre wire jumper of molten panda type
Connector connects test of light source device.
By test of light source device to the real-time measurement of light source SLED, the process for resolving fine measurement is saved, wherein the first coupling
Clutch 2 is the input/output structure of one kind 2 × 2, since it is directly connected to light source SLED, optical power output source to the first coupler
2 loss can be ignored, thus the light component that the first coupler 2 enters the polarizer 3 by input/output terminal can be set
It is same or similar with the light component ratio of test of light source device is entered by second output terminal.
The present embodiment 2 increases a second output terminal by the first coupler of setting, and the optical signal of light source is divided into and is used for
The part of test of light source and part for measurement can be surveyed when photodetector occurred without the phenomenon that output by light source
Examination part is tested, in conjunction with reflection optical test set as a result, to judge photodetector or light source whether failure.
A kind of specific embodiment of current transformer with optical path provided by the invention is not limited to include 2 light
Fine coupler can also carry out spectrophotometric test using more couplers, and also can use 1 M × N-type coupler is coupler
Module, as shown in fig. 6, the Coupler Module includes optical signal input, input/output terminal, second output terminal, reflection light output
End and reflected light test lead, wherein the function of each port is identical as the function of above-described embodiment 1, the port of embodiment 2.
Specific embodiment of the present invention is presented above, but the present invention is not limited to described embodiment.
Under the thinking that the present invention provides, to the skill in above-described embodiment by the way of being readily apparent that those skilled in the art
Art means are converted, are replaced, are modified, and play the role of with the present invention in relevant art means it is essentially identical, realize
Goal of the invention it is also essentially identical, the technical solution formed in this way is to be finely adjusted to be formed to above-described embodiment, this technology
Scheme is still fallen in protection scope of the present invention.
Claims (10)
1. a kind of current transformer with optical path, including light source, photodetector and the first coupler, first coupling
The first output end, optical signal input and input/output terminal are provided on device；The light source connects the light by optical fiber output
Signal input part, the input/output terminal is for output optical signal and receives corresponding reflected light optical signal, which is characterized in that institute
Stating current transformer further includes the second coupler, be provided on second coupler first input end, reflection light output end and
Reflected light test lead, the first output end optical fiber connect the first input end, and the reflection light output end optical fiber connects institute
Photodetector is stated, the reflected light test lead is for connecting reflection optical test set, to test the reflected light optical signal.
2. the current transformer according to claim 1 with optical path, which is characterized in that on first coupler also
It is provided with second output terminal；The second output terminal optical fiber is for connecting test of light source device, to test the light source output
Optical signal.
3. the current transformer according to claim 1 or 2 with optical path, which is characterized in that the current transformer
It further include the polarizer, straight waveguide phase modulator, optical-fibre wave plate, Fibre Optical Sensor ring, reflecting mirror and signal processing apparatus；Pass through institute
The light source optical signal for stating input/output terminal passes sequentially through the polarizer of optical fiber connection, the straight waveguide phase modulator, institute
It is returned after stating optical-fibre wave plate and the Fibre Optical Sensor ring through reflecting mirror reflection, the Fibre Optical Sensor ring is by the optical-fibre wave plate
Optical fiber between the reflecting mirror is constituted；The output end signal of the photodetector connects the defeated of the signal processing apparatus
Enter end, the output end signal of the signal processing apparatus connects the straight waveguide phase modulator.
4. the current transformer according to claim 3 with optical path, which is characterized in that the current transformer also wraps
Host computer display processing unit is included, the output end signal of the signal processing apparatus connects the host computer display processing unit.
5. the current transformer according to claim 2 or 4 with optical path, which is characterized in that the setting input is defeated
The splitting ratio of outlet and the second output terminal is the first setting value.
6. the current transformer according to claim 1 or 4 with optical path, which is characterized in that set the reflected light
The splitting ratio of output end and the reflected light test lead is the second setting value.
7. the current transformer according to claim 6 with optical path, which is characterized in that second setting value is not small
In 0.95.
8. the current transformer according to claim 7 with optical path, which is characterized in that first coupler is 2
× 2 input/output structure, the input/output structure that second coupler is 1 × 2.
9. the current transformer according to claim 2 with optical path, which is characterized in that the reflected light test lead is logical
The first optical fiber jumper terminal connection reflection optical test set is crossed, the second output terminal connects light by the second optical fiber jumper terminal
Source test device.
10. the current transformer according to claim 9 with optical path, which is characterized in that first optical patchcord
Connector and second optical fiber jumper terminal are polarization maintaining optical fibre jumper terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711098574.7A CN109765415A (en) | 2017-11-09 | 2017-11-09 | A kind of current transformer with optical path |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711098574.7A CN109765415A (en) | 2017-11-09 | 2017-11-09 | A kind of current transformer with optical path |
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| CN109765415A true CN109765415A (en) | 2019-05-17 |
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| CN201711098574.7A Pending CN109765415A (en) | 2017-11-09 | 2017-11-09 | A kind of current transformer with optical path |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288888A (en) * | 2011-06-12 | 2011-12-21 | 华北电力大学（保定） | Device and method for monitoring performance of semiconductor laser device of electric pump |
| WO2014063529A1 (en) * | 2012-10-26 | 2014-05-01 | 易能（中国）电力科技有限公司 | All-fiber current transducing system |
| CN204154888U (en) * | 2014-07-28 | 2015-02-11 | 北京自动化控制设备研究所 | A kind of all-fiber current transformator sensing ring device for detecting performance |
| CN104950154A (en) * | 2014-03-31 | 2015-09-30 | 北京自动化控制设备研究所 | High-precision high-reliability and all-fiber current transformer |
| CN105301319A (en) * | 2015-10-20 | 2016-02-03 | 浙江大学 | Mode-locked laser type all-fiber current transformer |
| CN105467188A (en) * | 2014-09-05 | 2016-04-06 | 易能乾元（北京）电力科技有限公司 | All-fiber current sensor adopting segmented light path fault diagnosis |
| CN207675818U (en) * | 2017-11-09 | 2018-07-31 | 许继集团有限公司 | A kind of all-fiber electronic current transformer with optical path |
-
2017
- 2017-11-09 CN CN201711098574.7A patent/CN109765415A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288888A (en) * | 2011-06-12 | 2011-12-21 | 华北电力大学（保定） | Device and method for monitoring performance of semiconductor laser device of electric pump |
| WO2014063529A1 (en) * | 2012-10-26 | 2014-05-01 | 易能（中国）电力科技有限公司 | All-fiber current transducing system |
| CN104950154A (en) * | 2014-03-31 | 2015-09-30 | 北京自动化控制设备研究所 | High-precision high-reliability and all-fiber current transformer |
| CN204154888U (en) * | 2014-07-28 | 2015-02-11 | 北京自动化控制设备研究所 | A kind of all-fiber current transformator sensing ring device for detecting performance |
| CN105467188A (en) * | 2014-09-05 | 2016-04-06 | 易能乾元（北京）电力科技有限公司 | All-fiber current sensor adopting segmented light path fault diagnosis |
| CN105301319A (en) * | 2015-10-20 | 2016-02-03 | 浙江大学 | Mode-locked laser type all-fiber current transformer |
| CN207675818U (en) * | 2017-11-09 | 2018-07-31 | 许继集团有限公司 | A kind of all-fiber electronic current transformer with optical path |
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