CN109443562A - Switchgear optical fiber grating temperature-measuring method for early warning - Google Patents
Switchgear optical fiber grating temperature-measuring method for early warning Download PDFInfo
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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Abstract
A kind of switchgear optical fiber grating temperature-measuring method for early warning of the present invention, the method for early warning are as follows: the temperature of each node is transferred in the conduction oil in base of ceramic (1) by corresponding base of ceramic (1) in switchgear, the optical fiber (3) for constituting fiber grating temperature sensor will obtain in real time optical signal through optical splitter because of temperature change and communicate female optical cable and summarize to fiber Bragg grating (FBG) demodulator, and fiber Bragg grating (FBG) demodulator is by optical signal demodulation at being transmitted through the network to server after digital signal;Server will be drawn the curve graph of temperature and time according to the digital signal of acquisition and be saved to the memory of server, when temperature is more than preset value, alarm signal is sent on the mobile phone of responsible person by network module and triggers the alarm module being connected on server and alarms by server.A kind of switchgear optical fiber grating temperature-measuring method for early warning of the present invention, structure is simple, use cost is cheap and is able to carry out real-time online accurately monitors.
Description
Technical field
The present invention relates to a kind of thermometric method for early warning, more particularly, to it is a kind of in the way of optical fiber grating temperature-measuring to switchgear
The method that interior temperature carries out real-time dynamic monitoring and carries out early warning.
Background technique
An electrical equipment in electric system is generally electrically set by breaker, transformer, cable, bus, switchgear etc.
Standby composition;It is connected by bus, lead, cable etc. between each other, necessarily leads to heat since electric current flows through tie point, and simultaneously
Almost all of electric fault can all lead to the variation of fault point temperature;Therefore the equipment in the electric system such as switchgear is carried out
Monitoring temperature is a kind of Normal practice of timely discovery failure.For many years since the limitation of technical level makes power system security
Operation level is subject to certain restrictions, although once utilizing infrared radiation thermometer, infrared thermoviewer, temperature sensing cable, traditional point type thermometric
System wishes to solve the above problems, but cannot achieve real-time monitoring, can only be inspected periodically, and the safety failed to report there are under-enumeration is hidden
Suffer from.In addition the mode of wireless temperature measurement is gradually adopted to measure device contact in recent years, this mode solves to a certain extent
The periodic monitoring bring blindness for having determined previous, but since such sensor needs therefore needs to develop a set of suitable for height
Compress switch the temperature monitoring equipments such as cabinet, disconnecting link.
For switchgear, to improve switchgear operation conditions, protection staff safety, nowadays conventional switchgear is whole
For shape metallic leak-proof structure, traditional switchgear temp measuring method has been not applied for setting in new switchgear, especially KYN type
Withdraw-type switch cabinet, conducting position are all blocked by insulating materials at runtime, and conventional infrared measurement of temperature means can not be to it
Internal unit measures, it is necessary to the method measured using inside switch cabinet, real-time monitoring high-current switch internal element fortune
Market condition finds failure source early, prevents the generation of accident.
Currently, for switchgear, common temperature measurement method has contact measurement method and non-contact both at home and abroad
Two kinds of formula measurement method: one, directly contacting sensor with testee, so that sensor and testee keep same temperature
Measurement method be contacting temperature measurement method;Two, sensor is not direct contacts with testee, but is surveyed by heat radiation principle
The method for measuring equipment under test temperature is contactless measurement.
Above two measurement method has extensive research in switch cabinet temperature detection technique, according to the master of detection means
Want feature that can be divided into following several:
1) IR thermometry:
IR thermometry is typical non-direct contact measurement method.The basic foundation of IR thermometry is one Bo Erzi of this special fence
The blackbody radiation law of graceful, Planck et al., black matrix are a kind of ideal objects, they all issue same at that same temperature
Electromagnetic spectrum, and, the size and its wave of object itself infrared energy unrelated with the characteristics such as the specific ingredient of black matrix and shape
Long distribution and its surface temperature have very close relationship, by the measurement to object itself radiated IR energy, from
And its surface temperature is measured, here it is basic principles based on infrared radiation temperature.Present infrared radiation thermometer is generally all
It is made of the part such as optical system, infrared detector, signal amplifier and signal processing, display output, core is infrared spy
Device is surveyed, its basic principle is the electric signal for incident infrared energy being transformed into measurable other forms, signal warp
The temperature value for being changed into measured target after amplifier and signal processing circuit are calculated and corrected according to the algorithm of instrument internal is crossed, so
Testee temperature is shown in optical system afterwards.
Before and after IR thermometry starts from World War II, infrared temperature-test technology is initially applied to military field, by U.S. De Kesalan
Instrument company develops infreared imaging device of the first generation for military field, referred to as infrared to seek viewing system (FLIR).
Middle nineteen sixties, AGA company, Sweden develop the industrial Real Time Image System of first set (THV), but there are it is at high cost,
The feature that volume is big, weight is heavy, not readily portable is improved by the several generations to instrument, the global function thermal imagery released in 1988
Instrument, by the measurement of temperature, modification, analysis, Image Acquisition, storage together in one, function, precision and the operability of instrument are all obtained
Significant raising is arrived.Middle nineteen nineties, FSI company, the U.S. succeed in developing first by military technology (FPA) turn it is civilian simultaneously
The thermal infrared imager (CCD) of commercialization, technical functionality is more advanced, and when live thermometric only needs alignment target to absorb image, and will
Above- mentioned information storage on the PC card in machine, that is, completing all operationss, the setting of various parameters can return to indoor software into
Row modification and analysis data, finally immediately arrive at examining report.Due to the improvement of technology and the change of structure, instead of complexity
Mechanical scanning, instruments weight is less than two kilograms, and in use as hand-held camera, one hand can be easily operated.With
Infrared temperature-test technology has obtained relatively broad application in power industry afterwards, and various infrared radiation thermometers are succeeded in developing simultaneously a large amount of one after another
It puts goods on the market, operation is more convenient, and volume is more compact, and infrared radiation thermometer need to only set parameter at present, is directed at testee
The surface temperature of object can be measured immediately, and possess the function of taking pictures with Automatic-searching highest temperature measuring point, scene is using very
It is convenient, to obtain universal application, and become the technical way of power industry equipment thermometric, the disadvantage is that can only be right
The aerial equipment of exposure measures, right although Some Universities also have developed infrared temperature measurement of high-voltage switch cabinet system
The shadow blocked by inside switch cabinet element to infra-red radiation optical path is easy in the mode of 1 high-tension switch cabinet, infrared probe thermometric
It rings, cannot accurately measure contact temperature, although certain correction can be taken, there are many influence factor of infra-red radiation and have
Time variation can not correct one by one it, thus this mode versatility is poor, can not promote the use of, which is only applicable to early stage
Switch cabinet structure, be not applied for insulating wrapping high-tension switch cabinet measurement.
2) wireless temperature measurement method
Wireless temperature measurement method is the improvement to contact temp measuring method, primarily to solving temperature measuring equipment and electric system high-low pressure
A kind of Novel temperature measuring method of isolation and generation, general wireless temperature measurement system usually consist of three parts: distributed temperature measuring node,
Data sink, back-end data processing system.Distributed temperature measuring node is directly installed on the position for needing thermometric, belongs to contact
Temp measuring method, data sink are placed on the place of range switch cabinet body certain distance, distributed temperature measuring node and data receiver
The transmission of data is carried out between device using wireless communication mode, to realize the acquisition of high_voltage isolation and temperature measurement data, is solved high
Pressure closes contact running temperature in cabinet and is not easy the problem monitored by IR thermometry.
Although wireless temperature measurement preferably resolves the safety issue of temperature measuring equipment, but there is also some in practical applications
Problem, wherein the job stability problem for being placed in temperature measuring equipment at switch contact position be one the most core the problem of, in reality
In the application of border, the electric current inductive power supply that the power supply Chang Weicong power line of the module obtains energy (is powered, not only according to battery
Periodic replacement battery is needed, and under battery supply feed state false alarm easily occurs for battery under high temperature environment, largely effects on
Monitoring accuracy), and the size that the power supply obtains energy changes with the variation of electric power specific electric load, amplitude of variation is very big, thus
Module will appear the phenomenon that electricity shortage often, for this problem, it is thus proposed that using sides such as battery, reduction temperature measuring equipment power consumptions
Method, such method is finished there are battery consumption needs the problems such as regularly replacing, at the same can also bring radio transmitted power too small and
By electromagnetic interference around, temperature measurement data transmission is caused mistake occur, and replaces device battery and high-tension switch cabinet is needed to stop supplying
Electricity is not able to satisfy the job requirement of high-tension switch cabinet continuous service.
3) passive and wireless thermometric
Some researchs are made into temperature sensor with surface acoustic wave device, go out temperature information by antenna feedback and are not necessarily to biography
Inductor component power supply, solves relevant issues caused by wired thermometric battery, but this device is immature, the crystalline material used
Thermal stability is poor, expensive and the signal quality for not improving wireless transmission method.
For this purpose, needing a kind of switchgear optical fiber grating temperature-measuring method for early warning for being able to solve the above problem, can facilitate
To the temperature in switchgear carry out low cost and in real time, accurate detection.
Summary of the invention
The purpose of the present invention is to overcome the above shortcomings and to provide a kind of switchgear optical fiber grating temperature-measuring method for early warning, knots
Structure is simple, use cost is cheap and is able to carry out real-time online accurately monitors.
The object of the present invention is achieved like this:
A kind of switchgear optical fiber grating temperature-measuring method for early warning, the method are based on a kind of switchgear optical fiber grating temperature-measuring early warning system
System, the system includes fiber grating temperature sensor, optical splitter, fiber Bragg grating (FBG) demodulator and server;The early warning
Method are as follows: the temperature of each node is transferred in the conduction oil in base of ceramic by corresponding base of ceramic in switchgear,
The optical fiber for constituting fiber grating temperature sensor will obtain in real time optical signal through optical splitter because of temperature change and communicate female light
Cable summarizes to fiber Bragg grating (FBG) demodulator, and fiber Bragg grating (FBG) demodulator is by optical signal demodulation at being transmitted through the network to clothes after digital signal
Business device;Server will be drawn the curve graph of temperature and time according to the digital signal of acquisition and be saved to the memory of server
Interior, when temperature is more than preset value, alarm signal is sent on the mobile phone of responsible person and is triggered by network module by server
The alarm module being connected on server is alarmed.
A kind of switchgear optical fiber grating temperature-measuring method for early warning of the present invention, the fiber grating temperature sensor includes ceramics
Pedestal, the base of ceramic top is recessed to be formed with a pit, conduction oil is filled in the pit, and be arranged in the crater wall of pit
There is a gap, one end of optical fiber passes through gap and is inserted in the pit of base of ceramic, and a pottery is covered at the top of base of ceramic
Filling with sealant is by the thermally conductive oil seal in pit between the seam of porcelain cover board, base of ceramic and ceramic cover plate and in gap
In base of ceramic, and one end of optical fiber is planted and is suspended in conduction oil.
A kind of switchgear optical fiber grating temperature-measuring method for early warning of the present invention, the back side of the base of ceramic is provided with structure glue
Layer, multiple fiber grating temperature sensors are adhered on the contact or busbar in switchgear by structural adhesive layer;Optical splitter peace
On outer wall loaded on switchgear, and the optical fiber of fiber grating temperature sensor is pierced by the inlet wire of access optical splitter after switchgear
End, the leading-out terminal of optical splitter are communicated female optical cable and are connected to fiber Bragg grating (FBG) demodulator, and the fiber Bragg grating (FBG) demodulator will demodulate
Signal afterwards passes through network connection to server.
A kind of switchgear optical fiber grating temperature-measuring method for early warning of the present invention, when server detects the temperature and time of drafting
When temperature ascension curve is larger in curve graph, carries out prompt alarm and send, server will be prompted to signal by network module at this time
It is sent on the mobile phone of responsible person and triggers the alarm module being connected on server and alarm;Prompt related personnel's temperature
Rise abnormity, it is most likely that break down, remind related personnel that fault point is discharged as early as possible.
Compared with prior art, the beneficial effects of the present invention are:
The present invention carries out real-time monitoring, fiber grating temperature sensor to the temperature in switchgear using fiber grating temperature sensor
The structure of device is simple, easy to use, greatly reduces use cost;And using being not easily susceptible to after fiber grating temperature sensor
It interferes and is not necessarily to power supply, therefore simplify structure, improve detection accuracy;Because of switchgear application fiber grating temperature sensor
After the early warning system of composition realizes method for early warning, the real-time online detection of running equipment of electric system is realized, by right
The analysis and prediction of equipment real time data, prevent the generation of accident, veritably accomplish to prevent trouble before it happens.It secondly is also to realize from now on
Repair based on condition of component improves overhaul efficiency, substantially reduces the cost of overhaul and management cost plays crucial effect.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of switchgear optical fiber grating temperature-measuring early warning system of the present invention.
Fig. 2 is that a kind of structure of the fiber grating temperature sensor of switchgear optical fiber grating temperature-measuring early warning system of the present invention is shown
It is intended to.
Wherein:
Base of ceramic 1, ceramic cover plate 2, optical fiber 3, structural adhesive layer 4;
Gap 1.1.
Specific embodiment
Referring to Fig. 1 and Fig. 2, a kind of switchgear optical fiber grating temperature-measuring method for early warning of the present invention, the method are based on
A kind of switchgear optical fiber grating temperature-measuring early warning system, the system include fiber grating temperature sensor, optical splitter, optical fiber
Grating demodulation instrument and server;
The fiber grating temperature sensor includes base of ceramic 1, and 1 top of base of ceramic is recessed to be formed with a pit,
It is filled with conduction oil in the pit, and is provided with a gap 1.1 in the crater wall of pit, one end of optical fiber 3 is planted across gap 1.1
In in the pit of base of ceramic 1, and the top of base of ceramic 1 is covered with a ceramic cover plate 2, base of ceramic 1 and ceramic cover plate 2
The conduction oil in pit is sealed in base of ceramic 1 by filling with sealant between seam and in gap 1.1, and the one of optical fiber 3
It plants and is suspended in conduction oil in end;
The back side of the base of ceramic 1 is provided with structural adhesive layer 4, and multiple fiber grating temperature sensors are viscous by structural adhesive layer 4
It invests on the contact or busbar in switchgear;Optical splitter is installed on the outer wall of switchgear, and fiber grating temperature sensor
Optical fiber 3 be pierced by the end of incoming cables that optical splitter is accessed after switchgear, the leading-out terminal of optical splitter is communicated female optical cable and is connected to light
Signal after demodulation is passed through network connection to server by fine grating demodulation instrument, the fiber Bragg grating (FBG) demodulator;
The method for early warning are as follows: the temperature of each node is transferred to base of ceramic 1 by corresponding base of ceramic 1 in switchgear
In interior conduction oil, the optical fiber 3 for constituting fiber grating temperature sensor will obtain in real time optical signal through light point because of temperature change
Road device and the female optical cable of communication summarize to fiber Bragg grating (FBG) demodulator, and fiber Bragg grating (FBG) demodulator leads to optical signal demodulation at after digital signal
Network transmission is crossed to server;Server will draw the curve graph of temperature and time according to the digital signal of acquisition and save to clothes
It is engaged in the memory of device, when temperature is more than preset value, alarm signal is sent to responsible person's by network module by server
On mobile phone and triggers the alarm module that is connected on server and alarm;
Further, it when temperature ascension curve is larger in the curve graph that server detects the temperature and time of drafting, carries out
Prompt alarm is sent, and server will be prompted to signal by network module and be sent on the mobile phone of responsible person and trigger connection at this time
It alarms in the alarm module on server;Prompt related personnel's temperature rise abnormity, it is most likely that break down, remind phase
Fault point is discharged in pass personnel as early as possible.
Theoretical foundation and development of the invention are as follows:
Optical fiber temperature-measurement method;
With the Showed Very Brisk that the development of fiber optic communication and integrated optics technique, optical fiber sensing technology are showed in sensor field,
Compared with traditional sensing technology, the advantage of fibre optical sensor is the physical characteristic of optical fiber itself rather than functional characteristic.Optical fiber
The exclusive optical fiber of sensing technology is light, diameter is thin, the decaying of electromagnetism interference, anticorrosive, high temperature resistant, signal is small, collects information sensing and passes
It is defeated in integrated the features such as, can solve the measurement problem that conventional detection technology is difficult to be competent at completely.Being primarily due to optical fiber itself is
Good insulating materials realizes the high_voltage isolation of electric system and measuring device naturally, temperature measuring equipment is avoided to cause the peace of equipment
Full accident, while optical fiber is used as the carrier of transmission and transducing signal, it effectively overcomes data in power system environment and transmits
Existing strong electromagnetic, measurement result are more accurate.Secondly optical fiber has good flexibility, and diameter is small, light-weight, can be with
It is deep into the inaccessiable position of conventional sensors institute to be detected, these features determine fibre optic temperature sensor in power train
The outstanding advantage of temperature of uniting measurement aspect, is the technical way for being more suitable for temperature of high-tension switch cabinet measurement.
According to the principle and effect of optical fiber temperature-measurement, optical fiber temperature-measurement is divided into: optical fiber grating temperature-measuring technology and fiber distribution thermometric
Technology.
Light distributed temperature measuring technology is to propose that it is with optical time domain reflection (OTDR) skill in the 70's ends of last century
The appearance of art and grow up, when being a kind of Raman backscattering signal and light generated when being transmitted in a fiber using laser
Domain principle of reflection obtains the monitoring method of spatial temperature distribution information, it by sensor fibre along field distribution, and using corresponding
Detection Techniques are detected or are monitored to the spatial distribution on optical fiber transmission path and the information changed over time.
Optical fiber grating temperature-measuring technology main devices are Bragg fibre optical sensors.1978, in Canadian Communication Studies
Heart first discovery UV Photosensitivity in Optical Fiber, and self-induction grating is obtained using standing wave wrting method.The human hairs such as G.Meltz in 1989
Ultraviolet light side write-in photosensitive grating technology is opened up, Fiber Bragg Grating technology gradually tends to mature and commercialization.To 1993 time
The progress of fine sensitizing technology and the use of phase mask plate make fiber grating realize batch production.The reflection or transmission of fiber grating
The wavelength at peak is related with the refractive index modulation period of grating and fiber core refractive index, and the variation of ambient temperature or strain will affect
The refractive index modulation period of fiber grating and fiber core refractive index, so as to cause the reflection of fiber grating or the change of peak transmission wavelength
Change, here it is the basic functional principles of fiber-optic grating sensor.Optical fiber used is a kind of to joined in fibre core in Practical Project
The special fiber of light-sensitive material is written with ultraviolet laser to fiber core side using the photorefractive effect of light-sensitive optical fibre, ultraviolet
After exposure the refractive index of fibre core can increase, form the optical grating construction of refractive index cycle variation, pass through measurement reflected light wavelength
Variation, to measure the temperature of testee.
The thermometric feature of above-mentioned optical fiber grating temperature-measuring technology determines that fibre optic temperature sensor is measured in electric system temperature
The outstanding advantage of aspect is the technological means for being more suitable for the measurement of power switch cabinet temperature.
It is further elucidated above for above-mentioned specific embodiment:
1), fiber Bragg grating (FBG) demodulator:
For a plurality of types of optical fiber grating sensing data acquisitions such as optical fiber grating temperature, strain, pressure, displacement and sensor letter
Number demodulation.Fiber Bragg grating (FBG) demodulator encloses width, and high resolution, dynamic range is big, high stable.Synchronous scanning typical frequencies can 1~
It is set between 5Hz, reaches as high as 1KHz;Internal wavelength calibration;The same type optical fiber grating sensor of compatible domestic and foreign manufacturers.
Working principle:
Based on the characteristic of F-P filter, the triangular wave generated using digital signal generator is as periodic linear scan electricity
It presses to drive F-P filter to work, so that wideband light source is modulated to wavelength tunable narrow-band corresponding with linear ramp
Inquire light source.It inquires narrow band light and enters tested FBG sensor array through coupler, reflectance spectrum is through optical detector and capture card
It is converted to digital signal and enters computer, as data to be demodulated.It inquires narrow band light and enters tape label thermal stability through coupler
Etalon module, transmitted spectrum is converted to digital signal through optical detector and capture card and enters computer, as real time calibration
Data.
2), fiber grating temperature sensor
Fiber grating temperature sensor is the temperature element for being directly installed on testee surface, can quick and precisely react it is in place
The temperature information set.
Fiber grating is a kind of novel photonic device, it is ordinary optic fibre after special optical technology processing, is made
Its fiber core refractive index is along the axial grating that periodic regularity distribution is presented, a kind of special passive device of formation, effect essence
On be that narrowband (transmission or reflection) optical filter or reflecting mirror are formed in fibre core, the property with wavelength selective filters
Energy.Under the influence of extraneous pressure, temperature, pitch can be changed, changed so as to cause wavelength reflection.According to application
Difference carries out different encapsulation to fiber grating.This patent is for the application in power switch cabinet, using ceramic package, pressure every
Temperature sensor is manufactured from equal measures.
3), server:
Including each temperature sensor, the setting of temperature monitoring parameters, the long-range acquisition of temperature information, comprehensive inquiry analysis
And temperature prediction alarm etc..
According to the actual situation, the functional module that these application functions can be used as power automatic system exists (will
Temperature information accesses power automatic system by standard data interface), it can also be separately as a set of switch cabinet temperature monitor
Main station system.
Meanwhile after optimization design, pilot switch cabinet temperature of all kinds of operational management personnel by remote access promptly and accurately
Situation, and extend following function:
(1), automatic fire alarm
It focuses fine grating temperature sensor region automatically and carries out real time temperature monitoring, detect the unusual fluctuations of scene temperature,
Preceding and alarm occurs in fire.
(2), point location is monitored
The number of each power equipment of liquid crystal display real-time display in a manner of electronic map and relevant temperature monitoring point and current temperature
Angle value and actual geographic position, facilitate manager works and maintenance.
(3), telecommunication network presence is inquired
The temperature and warning message of each monitoring point are all saved in bulk storage, and system is splitted data into according to the time and gone through
History information, real time information;The real-time state monitoring time interval that management operator can dynamically adjust point being monitored meets real
Border requires;Management operator can check the historical temperature change curve of each monitoring point on a local area network, mention for decision and maintenance
It is supported for data;
(4), alarm settings
Can the overtemperature alarm trigger condition to switchgear contact temperature set, be applicable in Various Seasonal temperature condition under and not
With the difference of power switch cabinet actual motion temperature under loading condiction
(5), temperature statistics
The Position Number and geography of equipment maximum operating temperature value and its time of origin, duration and corresponding monitoring point can be provided
Information.
(6), system interlink
Fiber Bragg grating (FBG) demodulator remote alarm interface output switching value can be directly accessed the existing fire control device in instrument operation room, realize
Fire alarm is simultaneously shown in fire watch room, and related personnel's mobile phone can also be sent information to by SMS.
(7), route self-test and fault location
With self-checking function, can loss to optical fiber transmission line and breakpoint location be accurately positioned, facilitate system debug, dimension
Shield and line maintenance.
(8), integrated with existing background system
Acquisition data are easily given into electric system backstage, realize remote access data.
In addition: it should be noted that above-mentioned specific embodiment is only a prioritization scheme of this patent, the skill of this field
Any change or improvement that art personnel are done according to above-mentioned design, within the protection domain of this patent..
Claims (4)
1. a kind of switchgear optical fiber grating temperature-measuring method for early warning, it is characterised in that: the method is based on a kind of switchgear optical fiber light
Grid temperature measurement early warning system, the system include fiber grating temperature sensor, optical splitter, fiber Bragg grating (FBG) demodulator and service
Device;
The method for early warning are as follows: the temperature of each node is transferred to ceramic base by corresponding base of ceramic (1) in switchgear
In conduction oil in seat (1), the optical fiber (3) for constituting fiber grating temperature sensor will obtain in real time optical signal because of temperature change
Summarize through optical splitter and the female optical cable of communication to fiber Bragg grating (FBG) demodulator, fiber Bragg grating (FBG) demodulator believes optical signal demodulation at number
Server is transmitted through the network to after number;Server will draw curve graph and the guarantor of temperature and time according to the digital signal of acquisition
It deposits to the memory of server, when temperature is more than preset value, alarm signal is sent to negative by server by network module
It blames on the mobile phone of people and triggers the alarm module being connected on server and alarm.
2. a kind of switchgear optical fiber grating temperature-measuring method for early warning as described in claim 1, it is characterised in that: the fiber grating temperature
Spending sensor includes base of ceramic (1), recessed at the top of the base of ceramic (1) to be formed with a pit, is filled in the pit
Conduction oil, and a gap (1.1) are provided in the crater wall of pit, one end of optical fiber (3) passes through gap (1.1) and is inserted in ceramic base
In the pit of seat (1), and a ceramic cover plate (2) are covered at the top of base of ceramic (1), base of ceramic (1) and ceramic cover plate (2)
Seam between and gap (1.1) interior filling with sealant the conduction oil in pit is sealed in base of ceramic (1), and light
It plants and is suspended in conduction oil in the one end of fine (3).
3. a kind of switchgear optical fiber grating temperature-measuring method for early warning as claimed in claim 2, it is characterised in that: the base of ceramic
(1) the back side is provided with structural adhesive layer (4), and multiple fiber grating temperature sensors are adhered to switchgear by structural adhesive layer (4)
On interior contact or busbar;Optical splitter is installed on the outer wall of switchgear, and the optical fiber (3) of fiber grating temperature sensor is worn
The end of incoming cables of optical splitter is accessed after switchgear out, the leading-out terminal of optical splitter is communicated female optical cable and is connected to fiber grating demodulation
Signal after demodulation is passed through network connection to server by instrument, the fiber Bragg grating (FBG) demodulator.
4. a kind of switchgear optical fiber grating temperature-measuring method for early warning as described in claim 1, it is characterised in that: when server detects
When temperature ascension curve is larger in the curve graph of the temperature and time of drafting, carries out prompt alarm and send, server passes through at this time
Network module will be prompted to signal and be sent on the mobile phone of responsible person and trigger the alarm module being connected on server report
It is alert;Prompt related personnel's temperature rise abnormity, it is most likely that break down, remind related personnel that fault point is discharged as early as possible.
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