CN106370908B - A kind of reliability monitoring system of optical current mutual inductor - Google Patents
A kind of reliability monitoring system of optical current mutual inductor Download PDFInfo
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- CN106370908B CN106370908B CN201610675600.7A CN201610675600A CN106370908B CN 106370908 B CN106370908 B CN 106370908B CN 201610675600 A CN201610675600 A CN 201610675600A CN 106370908 B CN106370908 B CN 106370908B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 100
- 238000012544 monitoring process Methods 0.000 title claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 46
- 239000013307 optical fiber Substances 0.000 claims abstract description 17
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
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- 238000006243 chemical reaction Methods 0.000 claims description 2
- 229940085805 fiberall Drugs 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims 1
- 238000012795 verification Methods 0.000 abstract description 2
- 230000003862 health status Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Abstract
A kind of reliability monitoring system of optical current mutual inductor, belongs to optical current mutual inductor field, and the present invention is to solve the problems, such as that the reliability of existing optical current mutual inductor is unable to get verification.The light that LED light source of the present invention is sent out is divided into two-beam through fiber optic splitter, and light inputs optical current sensor incidence end, another way optical transport to collector all the way；Collector is accessed by the optical signal of optical current sensor, by intelligent acess temperature modulation demodulator, the temperature information that temperature modulation demodulator obtains inputs collector by optical fiber for a fibre optic temperature sensor and secondary fibre optic temperature sensor；Collector is connect with combining unit, reliability data recording unit is parsed to merging cell data information, it obtains optical current sensor work state information, the temperature information that LED light source status information, a fibre optic temperature sensor and secondary fibre optic temperature sensor measure, and data is recorded with Fixed Time Interval.The present invention is used for electric system.
Description
Technical field
The invention belongs to optical current mutual inductor fields, and in particular to a kind of reliability monitoring system of optical current mutual inductor
System.
Background technology
Optical current mutual inductor with it without magnetic saturation, good insulation preformance and strong antijamming capability the advantages that in the power system
Extensive concern has been obtained, has used optical current mutual inductor more and more in intelligent substation, it is operational reliability, steady
The qualitative safe operation for directly or indirectly affecting intelligent substation.
Research both at home and abroad about optical current sensor reliability is also fewer, and there are no the examinations of targetedly reliability
Standard inspection standard and program, more without establishing the belief system for optical current mutual inductor.Optical current based on optical principle
Mutual inductor is the product of optical, mechanical and electronic integration, and reliability involves a wide range of knowledge, influence factor is complicated, fault mode is numerous, including light
Many optical elements such as source, optical fiber, the polarizer, analyzer, magneto-optic glass, complex, reliability is not verified, can
It can need often repair or replace.
Invention content
The invention aims to solve the problems, such as that the reliability of existing optical current mutual inductor is unable to get verification, provide
A kind of reliability monitoring system of optical current mutual inductor.
A kind of reliability monitoring system of optical current mutual inductor of the present invention, including a sensing unit, secondary place
Unit and reliability data recording unit are managed, between a sensing unit, after-treatment unit and reliability data recording unit
Connected with optical fiber；
Sensing unit includes optical current sensor and a fibre optic temperature sensor, and after-treatment unit includes
LED light source, fiber optic splitter, collector, secondary fibre optic temperature sensor, temperature modulation demodulator and combining unit；
The light that LED light source is sent out is divided into two-beam by fiber optic splitter, and light inputs optical current by optical fiber and passes all the way
The incidence end of sensor, another way optical transport to collector；It is acquired by intelligent acess by the optical signal of optical current sensor
Device, a fibre optic temperature sensor and secondary fibre optic temperature sensor pass through intelligent acess temperature modulation demodulator, temperature tune
The temperature information of a sensing unit and after-treatment unit that modulator-demodulator obtains inputs collector by optical fiber；Collector with
The mode of serial communication is connect by optical fiber with combining unit, reliability data recording unit to the data information of combining unit into
Row parsing, obtains the work state information of optical current sensor, the status information of LED light source, a fibre optic temperature sensor
The temperature information measured with secondary fibre optic temperature sensor, and data are recorded at regular intervals.
Advantages of the present invention：The performance of optical device inside optical current mutual inductor is largely one slowly varying
Process, after realizing that optical current mutual inductor internal state monitors and record characterizes the sample values of operating status in real time, no
It only may be implemented to give alarm, reasonable arrangement maintenance before it breaks down, and the data of record can be utilized to light
The health status and service life for learning current transformer are assessed.The operational reliability of substation can be thus greatly improved,
Avoid economic loss caused by fault outage.Therefore, the reliability monitoring system for establishing optical current mutual inductor is very necessary,
To realize that status real time monitor and reliable life to optical current mutual inductor are assessed, promote the practicality of optical current mutual inductor
Change and the popularization and application in intelligent grid.
The data that characterization operating status is monitored and recorded in real time to optical current mutual inductor internal state, not only may be implemented
Alarm, reasonable arrangement maintenance are given before it breaks down, and the data of record can be utilized to optical current mutual inductance
The health status and service life of device are assessed.The application of achievement of the present invention can greatly improve the operational reliability of substation,
Economic loss caused by fault outage is avoided, there is important value to the functionization and popularization and application of optical sensor.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of the reliability monitoring system of optical current mutual inductor of the present invention.
Specific implementation mode
Specific implementation mode one：Illustrate present embodiment with reference to Fig. 1, a kind of optical current is mutual described in present embodiment
The reliability monitoring system of sensor, including a sensing unit 1, after-treatment unit 2 and reliability data recording unit 3, one
It is connected with optical fiber between secondary sensing unit 1, after-treatment unit 2 and reliability data recording unit 3；
Sensing unit 1 includes an optical current sensor 1-1 and fibre optic temperature sensor 1-2, after-treatment list
Member 2 includes LED light source 2-1, fiber optic splitter 2-2, collector 2-3, secondary fibre optic temperature sensor 2-4, temperature modulation demodulation
Device 2-5 and combining unit 2-6；
The light that LED light source 2-1 is sent out is divided into two-beam by fiber optic splitter 2-2, and light inputs optics by optical fiber all the way
The incidence end of current sensor 1-1, another way optical transport to collector 2-3；It is logical by the optical signal of optical current sensor 1-1
Intelligent acess collector 2-3, a fibre optic temperature sensor 1-2 and secondary fibre optic temperature sensor 2-4 is crossed to connect by optical fiber
Enter temperature modulation demodulator 2-5, the temperature for the sensing unit 1 and after-treatment unit 2 that temperature modulation demodulator 2-5 is obtained
Information inputs collector 2-3 by optical fiber；Collector 2-3 is connect by optical fiber with combining unit 2-6 in a manner of serial communication,
Reliability data recording unit 3 parses the data information of combining unit 2-6, obtains the work of optical current sensor 1-1
Make status information, the status information of LED light source 2-1, a fibre optic temperature sensor 1-2 and secondary fibre optic temperature sensor 2-4
The temperature information measured, and data are recorded at regular intervals.
In present embodiment, between a sensing unit 1, after-treatment unit 2 and reliability data recording unit 3 with
Optical fiber carries out signal connection, and all external interfaces are optical interfaces, improve system anti-electromagnetic interference capability.
Specific implementation mode two：Illustrate that present embodiment, present embodiment make into one embodiment one with reference to Fig. 1
Step explanation, No. one time fibre optic temperature sensor 1-2 is closely affixed on the side wall of optical current sensor 1-1.
In present embodiment, No. one time fibre optic temperature sensor 1-2 is close to optical current sensor 1-1, with accurate detection light
Learn the environment temperature residing for current sensor 1-1.
Specific implementation mode three：Illustrate that present embodiment, present embodiment make into one embodiment one with reference to Fig. 1
Step explanation, a sensing unit 1 include a multigroup identical optical current sensor 1-1 and fibre optic temperature sensor 1-2, point
A optical current sensor 1-1 receives the light beam that LED light source 2-1 is sent out, by the light of each optical current sensor 1-1
Signal passes through intelligent acess temperature modulation solution by intelligent acess collector 2-3, each fibre optic temperature sensor 1-2
Adjust device 2-5.
Specific implementation mode four：Illustrate that present embodiment, present embodiment make into one embodiment one with reference to Fig. 1
Step explanation, reliability data recording unit 3 parse the data information of combining unit 2-6, obtain optical current sensor
The detailed process of the work state information of 1-1 and the status information of LED light source 2-1 is：
If the luminous power that LED light source 2-1 is sent out is P0, the splitting ratio of coefficient of variation β, fiber optic splitter 2-2 are K1:K2,
Optical current sensor 1-1 optical path loss factor alphas；
The optical signal that collector 2-3 is received is two-way：Optical current sensor 1-1 is come from all the way exports P1, come
The output P of collector 2-3 is directly connected to from fiber optic splitter 2-22；
P is exported from optical current sensor 1-11, it is expressed as：
P1=α K1βP0[1+sin(2θ)] (1)
Wherein, θ is the Faraday rotation angle that electric current i (t) is tested corresponding to Primary Conductor 4；
Before collector 2-3 analog-to-digital conversions, optical current sensor 1-1 exports P1It is broken down into two paths of signals：All the way
It is all the way the DC bias signal of optical current sensor 1-1 to be tested the AC signal of electric current i (t) comprising Primary Conductor 4,
The DC bias signal of optical current sensor 1-1 is expressed as：
P1dc=α K1βP0 (2)
The output P of collector 2-3 is directly connected to from fiber optic splitter 2-22, it is expressed as：
P2=K2βP0 (3)
It is located at monitoring initial time, the direct current biasing output and fiber optic splitter 2-2 outputs point of optical current sensor 1-1
P is not used10And P20It indicates：
P10=α0K1β0P0 (4)
P20=K2β0P0(5)；
Wherein, α0Indicate the optical path loss coefficient in monitoring initial time, β0Indicate the fluctuation system in monitoring initial time
Number；
During monitoring, the direct current biasing output and fiber optic splitter 2-2 outputs of optical current sensor 1-1 are used respectively
P11And P21It indicates：
P11=α1K1β1P0 (6)
P21=K2β2P0(7)；
Wherein, α1Indicate optical path loss coefficient during monitoring, β1Indicate coefficient of variation during prison；
The criterion for selecting the variable quantity of insertion loss to fail as optical current sensor, then optical current sensor 1-1
Output light path insertion loss, including LED light source 2-1 fluctuation variable quantity △ A1ILIt is expressed as：
Fiber optic splitter 2-2 output light path insertion loss, i.e. the variable quantity △ A of LED light source 2-1 fluctuations2ILIt is expressed as：
By formula (8) and formula (9), optical current sensor 1-1 insertion loss is obtained, rejects the change of the fluctuation of LED light source 2-1
Change amount △ AαILIt is expressed as：
I.e.：The variable quantity and optical current sensor 1-1 insertion loss for obtaining LED light source 2-1 fluctuations reject LED light source 2-
The variable quantity of 1 fluctuation；
The work state information of variable quantity, that is, LED light source 2-1 of LED light source 2-1 fluctuations；
Optical current sensor 1-1 insertion loss rejects variable quantity, that is, optical current sensor of the fluctuation of LED light source 2-1
The work state information of 1-1.
Claims (4)
1. a kind of reliability monitoring system of optical current mutual inductor, which is characterized in that including a sensing unit (1), secondary
Processing unit (2) and reliability data recording unit (3), a sensing unit (1), after-treatment unit (2) and reliability number
It is connected with optical fiber according between recording unit (3)；
Sensing unit (1) includes optical current sensor (1-1) and a fibre optic temperature sensor (1-2), after-treatment
Unit (2) include LED light source (2-1), fiber optic splitter (2-2), collector (2-3), secondary fibre optic temperature sensor (2-4),
Temperature modulation demodulator (2-5) and combining unit (2-6)；
The light that LED light source (2-1) is sent out is divided into two-beam by fiber optic splitter (2-2), and light inputs optics by optical fiber all the way
The incidence end of current sensor (1-1), another way optical transport to collector (2-3)；By the light of optical current sensor (1-1)
Signal passes through intelligent acess collector (2-3), a fibre optic temperature sensor (1-2) and secondary fibre optic temperature sensor (2-4)
By intelligent acess temperature modulation demodulator (2-5), a sensing unit (1) that temperature modulation demodulator (2-5) obtains and
The temperature information of after-treatment unit (2) inputs collector (2-3) by optical fiber；Collector (2-3) is in a manner of serial communication
Connect with combining unit (2-6) by optical fiber, reliability data recording unit (3) to the data information of combining unit (2-6) into
Row parsing, obtains the work state information of optical current sensor (1-1), the status information of LED light source (2-1), an optical fiber
The temperature information that temperature sensor (1-2) and secondary fibre optic temperature sensor (2-4) measure, and logarithm at regular intervals
According to being recorded.
2. a kind of reliability monitoring system of optical current mutual inductor according to claim 1, which is characterized in that primary light
Fine temperature sensor (1-2) is closely affixed on the side wall of optical current sensor (1-1).
3. a kind of reliability monitoring system of optical current mutual inductor according to claim 1, which is characterized in that primary to pass
It includes multigroup identical optical current sensor (1-1) and a fibre optic temperature sensor (1-2), each optics to feel unit (1)
Current sensor (1-1) receives the light beam that LED light source (2-1) is sent out, by the light of each optical current sensor (1-1)
For signal by intelligent acess collector (2-3), each fibre optic temperature sensor (1-2) passes through intelligent acess temperature tune
Modulator-demodulator (2-5).
4. a kind of reliability monitoring system of optical current mutual inductor according to claim 1, which is characterized in that reliability
Data record unit (3) parses the data information of combining unit (2-6), obtains the work of optical current sensor (1-1)
The detailed process for making status information and the status information of LED light source (2-1) is：
If the luminous power that LED light source (2-1) is sent out is P0, the splitting ratio of coefficient of variation β, fiber optic splitter (2-2) are K1:K2,
Optical current sensor (1-1) optical path loss factor alpha；
The optical signal that collector (2-3) receives is two-way：Optical current sensor (1-1) is come from all the way exports P1, come from all the way
Fiber optic splitter (2-2) is directly connected to the output P of collector (2-3)2；
P is exported from optical current sensor (1-1)1, it is expressed as：
P1=α K1βP0[1+sin(2θ)] (1)
Wherein, θ is the Faraday rotation angle that electric current i (t) is tested corresponding to Primary Conductor (4)；
Before collector (2-3) analog-to-digital conversion, optical current sensor (1-1) exports P1It is broken down into two paths of signals：It is all the way
Including Primary Conductor (4) is tested the AC signal of electric current i (t), believe all the way for the direct current biasing of optical current sensor (1-1)
Number, the DC bias signal of optical current sensor (1-1) is expressed as：
P1dc=α K1βP0 (2)
The output P of collector (2-3) is directly connected to from fiber optic splitter (2-2)2, it is expressed as：
P2=K2βP0 (3)
It is located at monitoring initial time, the direct current biasing output and fiber optic splitter (2-2) output point of optical current sensor (1-1)
P is not used10And P20It indicates：
P10=α0K1β0P0 (4)
P20=K2β0P0(5)；
Wherein, α0Indicate the optical path loss coefficient in monitoring initial time, β0Indicate the coefficient of variation in monitoring initial time；
During monitoring, the direct current biasing output and fiber optic splitter (2-2) output of optical current sensor (1-1) are used respectively
P11And P21It indicates：
P11=α1K1β1P0 (6)
P21=K2β2P0(7)；
Wherein, α1Indicate optical path loss coefficient during monitoring, β1Indicate coefficient of variation during prison；
The criterion for selecting the variable quantity of insertion loss to fail as optical current sensor, then optical current sensor (1-1) is defeated
Go out light path insertion loss, including LED light source (2-1) fluctuation variation delta A1ILIt is expressed as：
The variation delta A of fiber optic splitter (2-2) output light path insertion loss, i.e. LED light source (2-1) fluctuation2ILIt is expressed as：
By formula (8) and formula (9), optical current sensor (1-1) insertion loss is obtained, rejects the change of the fluctuation of LED light source (2-1)
Change amount Δ AαILIt is expressed as：
I.e.：The variable quantity and optical current sensor (1-1) insertion loss for obtaining LED light source (2-1) fluctuation reject LED light source
The variable quantity of the fluctuation of (2-1)；
The work state information of variable quantity, that is, LED light source (2-1) of LED light source (2-1) fluctuation；
Optical current sensor (1-1) insertion loss rejects variable quantity, that is, optical current sensor of the fluctuation of LED light source (2-1)
The work state information of (1-1).
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| CN109164288A (en) * | 2018-07-10 | 2019-01-08 | 北京四方继保自动化股份有限公司 | The state monitoring method of optical fiber current mutual inductor |
| CN109581266B (en) * | 2018-11-20 | 2021-10-08 | 国网江苏省电力有限公司 | Running health condition analysis method of all-fiber current transformer |
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| CN102818919A (en) * | 2012-08-27 | 2012-12-12 | 哈尔滨工业大学 | Optical current transformer and method for resisting external magnetic field interference |
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| CN103630781A (en) * | 2013-11-27 | 2014-03-12 | 贵州电力试验研究院 | Composite energy supply non-contact on-line monitoring system for active electronic current transformer |
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2016
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|---|---|---|---|---|
| EP1245961A3 (en) * | 2001-03-19 | 2003-04-23 | Siemens Aktiengesellschaft | Stabilized magneto-optic current measuring device |
| WO2010041583A1 (en) * | 2008-10-07 | 2010-04-15 | 東光電気株式会社 | Optical fiber current sensor |
| CN102818919A (en) * | 2012-08-27 | 2012-12-12 | 哈尔滨工业大学 | Optical current transformer and method for resisting external magnetic field interference |
| CN103163352A (en) * | 2013-03-21 | 2013-06-19 | 哈尔滨工业大学 | Mixing optics current transformer and method for achieving self-correcting measurement thereof |
| CN103630781A (en) * | 2013-11-27 | 2014-03-12 | 贵州电力试验研究院 | Composite energy supply non-contact on-line monitoring system for active electronic current transformer |
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