CN105572551A - Insulation state on-line integrated monitoring system for switchgear - Google Patents
Insulation state on-line integrated monitoring system for switchgear Download PDFInfo
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- CN105572551A CN105572551A CN201610036591.7A CN201610036591A CN105572551A CN 105572551 A CN105572551 A CN 105572551A CN 201610036591 A CN201610036591 A CN 201610036591A CN 105572551 A CN105572551 A CN 105572551A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
Abstract
The invention relates to an insulation state on-line integrated monitoring system for a switchgear. The insulation state on-line integrated monitoring system comprises a plurality of monitoring units which are connected with an operation management server through the Ethernet, wherein each monitoring unit includes a monitor, a star coupler, a light wave multiplexer and a plurality of optical temperature magnetic field composite sensors; an input optical port of the star coupler is connected with a broadband light source through fiber; each output optical port of the star coupler is connected with one input optical port of the light wave multiplexer through one optical temperature magnetic field composite sensor; and an output optical port of the light wave multiplexer is connected with an input optical port of the monitor through the fiber. By means of combination of the optical magnetic field sensing technology with the distributed fiber grating temperature sensing technology, the insulation state on-line integrated monitoring system for a switchgear realizes measurement of the temperature and the local signal at the same time. The insulation state on-line integrated monitoring system for a switchgear can timely discover the fault of the switchgear, can realize early warning and positioning of the fault, and is conductive to making a repair schedule reasonably and improving the operation reliability of an electric power system.
Description
Technical field
The present invention relates to a kind of device for on-line monitoring power switch cabinet state of insulation, belong to detection technique field.
Background technology
Switch cubicle is the key equipment in electric system, the loose contact that the defect of inside switch cabinet insulation or deterioration, conductive connection part divide all can make circuit and equipment impaired, also can cause large area blackout time serious.According to a electric system 6 ~ 10kV switch cubicle accident statistics, the fault that insulation and current-carrying cause accounts for 40.2% of sum, and the accident wherein caused due to the flashover of insulated part accounts for 79.0% of insulation fault sum.And the accident caused due to stab contact loose contact accounts for 71.1% of current-carrying total number of accident.All overheated and electric discharge phenomena can be produced in the latent period of these accidents.
For guaranteeing power supply reliability, power department takes the way of routine test and maintenance to ensure that switch cubicle normally runs.Prophylactic repair adds the operating cost of power equipment and power off time but cannot Timeliness coverage insulation fault, and in the interval period of adjacent twice maintenance, such fault still happens occasionally.Therefore, only have and carry out real time on-line monitoring to equipment operation condition, determine time and the measure of maintenance according to the running status of equipment and the degradation of insulation, the generation of the effective Accident prevention of ability, reduces power off time, improves the operational reliability of electric system.
Understand the phenomenons such as generation current pulse, electromagnetic radiation, ultrasound wave, optical radiation in shelf depreciation process, and cause local overheating.Existing partial discharge monitoring equipment is generally obtain partial discharge pulse's signal by sensor, then by analyzing the characteristic fingerprint of shelf depreciation: there is phase place and judge insulation fault type and position occurs in discharge capacity q, discharge energy E, discharge pulse repetition rate n or electric discharge.From the feature of shelf depreciation, Partial discharge signal is the pulse sequence signal that rise time and duration are all very short, effective bandwidth can reach hundreds of MHz, broadband, highly sensitive sensor should be adopted, to obtain abundant shelf depreciation information, improve the validity of on-line monitoring.But owing to there is the undesired signal of large amount of complex in the running environment of electrical equipment, and local discharge signal is very faint, and therefore this monitoring equipment cannot obtain desirable monitoring effect, be necessary to develop new monitoring system.
Summary of the invention
The object of the invention is to the drawback for prior art, provide a kind of switch cubicle state of insulation online comprehensive monitor system, to realize early warning and the location of switch cubicle fault, effective Accident prevention spreads, and improves the operational reliability of electric system.
Problem of the present invention solves with following technical proposals:
The online comprehensive monitor system of a kind of switch cubicle state of insulation, formation comprises the multiple monitoring means be connected with operational management server by Ethernet, each monitoring means comprises monitor, star coupler, light wave multiplexer, with multiple optical temperature magnetic fields compound sensor, the defeated light inlet of described star coupler connects wideband light source by optical fiber, the each defeated light-emitting window of star coupler is connected with a defeated light inlet of light wave multiplexer by an optical temperature magnetic field compound sensor, the defeated light-emitting window of described light wave multiplexer is connected with the defeated light inlet of monitor by optical fiber.
The online comprehensive monitor system of above-mentioned switch cubicle state of insulation, described optical temperature magnetic field compound sensor comprises optical circulator, fiber grating, input collimating apparatus, the polarizer, magneto-optic element, analyzer and output collimator, first light mouth of described optical circulator connects a defeated light-emitting window of star coupler, second light mouth connects fiber grating, 3rd light mouth is successively through input collimating apparatus, the polarizer, magneto-optic element, analyzer is connected with a defeated light inlet of light wave multiplexer with output collimator, the centre wavelength of multiple optical temperature magnetic field compound sensor fiber grating used is different, described monitor judges that the method for switch cubicle state of insulation is:
A. the light signal from multiplexed optical wave device is divided into two-way by monitor, the method of frequency sweep is adopted to be separated to a road light signal wherein, obtain and the light signal corresponding to the centre wavelength of fiber grating in each optical temperature magnetic field compound sensor, and try to achieve the changes delta λ of each fiber grating reflection wave centre wavelength
b, then according to the wavelength variations Δ λ demarcated in advance
band the funtcional relationship Δ λ between temperature variation Δ T
b=f (Δ T) extrapolates temperature variation Δ T, thus demodulates the temperature signal of corresponding sensing point; After another road light signal is separated according to the wavelength coverage corresponding to the fiber grating in each optical temperature magnetic field compound sensor, converts every road light signal to voltage signal u, and try to achieve the DC component u of voltage signal u
aCwith AC compounent u
dC, then the magnetic induction density of sensing point is
wherein:
the Verdet constant that V (T) is magneto-optic element;
B. the sensing point temperature of trying to achieve and magnetic induction density and respective threshold value are compared, if temperature and/or magnetic induction density exceed its threshold value, then send corresponding warning message to operational management server.
The online comprehensive monitor system of above-mentioned switch cubicle state of insulation, described monitor comprises light splitting coupler, field signal process subelement, processes temperature signal subelement and controls subelement, and the defeated light inlet of described light splitting coupler connects the defeated light-emitting window of light wave multiplexer by optical fiber; Described field signal process subelement comprises demodulation multiplexer, field signal processor and multiple photoelectric commutator; The defeated light inlet of described demodulation multiplexer connects the first defeated light-emitting window of light splitting coupler, the input end of multiple photoelectric commutator connects the defeated light-emitting window of difference of demodulation multiplexer respectively, the electric signal that each photoelectric commutator exports sends into the input port of field signal processor after amplifying circuit amplifies, and described field signal processor is connected with control subelement by SPI interface; Described processes temperature signal subelement comprises tunable optic filter, photoelectric detector and temperature signal processor, second defeated light-emitting window of the input termination light splitting coupler of described tunable optic filter, the control signal through DA conversion of the control end jointing temp signal processor output of tunable optic filter; The output terminal of the input termination tunable optic filter of described photoelectric detector, the electric signal that photoelectric detector exports first is amplified by amplifying circuit, then after A/D conversion the input port of cut-in temperature signal processor; Described temperature signal processor is connected with control subelement by SPI interface.
The online comprehensive monitor system of above-mentioned switch cubicle state of insulation, described control subelement comprise control processor and be connected with control processor LCD interface, mouse and keyboard interface, Ethernet interface, alarm control interface and gsm communication interface.
The online comprehensive monitor system of above-mentioned switch cubicle state of insulation, the angle between the light transmission shaft of described analyzer and the light transmission shaft of the polarizer is 45 degree.
The online comprehensive monitor system of above-mentioned switch cubicle state of insulation, described magneto-optic element adopts BiGd:YIG diaphragm.
Optical magnetic field sensing technology and distributed fiber grating temperature sensor technology organically combine by the present invention, measure while achieving temperature and Partial discharge signal.This system can Timeliness coverage switch cubicle fault, realizes early warning and the location of fault, contributes to rational turnaround plan, improves the operational reliability of electric system.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention, wherein, and the structural representation that (a) is monitoring means; B connection diagram that () is operational management server and monitoring means and client;
Fig. 2 is optical temperature magnetic field compound sensor structural representation;
Fig. 3 is the structural representation of monitor;
Fig. 4 is monitoring and the operational management process flow diagram of present system.
In figure, each label is: SC, star coupler, TM1 ~ TMn, first compound sensor ~ the n-th optical temperature magnetic field, optical temperature magnetic field compound sensor, OM, light wave multiplexer, FUT1, forward direction optical fiber, FUT2, backward optical fiber, OC, light splitting coupler, UM, field signal process subelement, UT, processes temperature signal subelement, UC, control subelement, LS, wideband light source, C, optical circulator, G, fiber grating, L1, input collimating apparatus, L2, output collimator, P, the polarizer, M, magneto-optic element, A, analyzer, CPU1, temperature signal processor, CPU2, control processor, CPU3, field signal processor.
In literary composition, each symbol is: the sensing no-load voltage ratio of K (T), magnetic field sensing head, P
0, input light intensity, P, sensing head output intensity, the voltage signal that u, P export after opto-electronic conversion and amplification, the Verdet constant of V (T), magneto-optic element M, the logical light length of l, magneto-optic element M, the Faraday rotation angle of θ, magneto-optic element M, T, temperature, B, magnetic induction density, the conversion coefficient of R, magnetic field sensing head.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Optical magnetic field sensing technology and distributed fiber grating temperature sensor technology organically combine by the present invention.Magnetic field sensing element and grating are encapsulated as one, form optical temperature magnetic field compound sensor, measure while realizing temperature and Partial discharge signal; Two parameter joint-detection, adopts same LASER Light Source, adopts unified wavelength-division multiplex technique; System adopts stelliform connection topology configuration, compares, improves stability, avoid the roundabout wiring of optical fiber at inside switch cabinet with series system.
Fiber grating and magneto-optic sensing head are packaged together and form optical temperature magnetic field compound sensor by the present invention, and each optical temperature magnetic field compound sensor of same switch cubicle shares same light source and same optical fiber by wavelength-division multiplex technique and forms star topology optical-fiber network.General each 10kV switch cubicle arranges 12 monitoring points.Traditional optical fiber grating sensing network and magneto-optical sensor are combined by the present invention simply, but the two to be organically blended be an optical-fiber network.
Referring to Fig. 1, the power switch cabinet state of insulation on-line monitoring system that the present invention proposes comprises: monitor, forward direction optical fiber, star coupler, optical temperature magnetic field compound sensor (the composite sensing head namely in Fig. 1), light wave multiplexer, backward optical fiber, operational management server.Monitor is connected with operational management server by Ethernet.
Described monitor passes through temperature and the changes of magnetic field situation of compound sensor Real-Time Monitoring measured point, optical temperature magnetic field, once occur overheated or find out Partial discharge signal, can automatically control audible-visual annunciator action, and corresponding warning message is sent on the mobile phone of managerial personnel automatically.Operational management server is connected the .NET framework based on Microsoft with the network of remote monitoring client, adopting B/S structure, without the need to installing client, facilitating the use of all types of user in LAN (Local Area Network); Arbitrary client of networking all by the browser access monitoring system that operating system carries, checks the running status of switch cubicle, running log and management maintenance information after certification.
Referring to Fig. 1 and Fig. 2, optical temperature magnetic field compound sensor comprises optical circulator C, fiber grating G, input collimating apparatus L1, polarizer P, magneto-optic element M, analyzer A, output collimator L2.In the present embodiment, magneto-optic element M adopts high sensitivity BiGd:YIG diaphragm.Described optical temperature magnetic field compound sensor is arranged on the shank of the easiest fault of switch cubicle.A general switch cubicle arranges 12 monitoring points.
Referring to Fig. 1 and Fig. 3, monitor comprises light splitting coupler, field signal process subelement, processes temperature signal subelement, controls subelement, wideband light source (wideband light source also can be arranged on monitor outside).Adopt wavelength to be wideband light source near 1550nm in the present embodiment, light source driving circuit is that constant current output is to reduce the fluctuation of light intensity.
Referring to Fig. 1 and Fig. 3, described field signal process subelement comprises demodulation multiplexer, photoelectric commutator, amplifying circuit, A/D conversion chip, CPU3 chip (field signal processor), working power.Wherein corresponding 12 monitoring points have 12 passages, adopt 12 channel parallel A/D conversion chips to gather the field signal of each monitoring point in switch cubicle in the present embodiment simultaneously.
Referring to Fig. 1 and Fig. 3, described processes temperature signal subelement comprises: tunable optic filter, photoelectric detector, amplifying circuit, A/D conversion chip, D/A conversion chip, ARM-CPU1 chip (temperature signal processor), working power.The temperature signal of each monitoring point in single channel A/D conversion chip acquisition time switch cubicle is adopted in the present embodiment.ARM-CPU1 chip produces discrete sawtooth signal, tunable optic filter is outputted to through D/A conversion chip, control the Resonant Intake System cyclical variation of tunable optic filter, travel through the wavelength that in the compound sensor of each optical temperature magnetic field, grating pair is answered, realize timesharing Wavelength demodulation.The light signal that tunable optic filter exports is converted to electric signal and after amplifying circuit amplifies, is gathered, recall temperature signal corresponding to each wavelength by ARM-CPU1 chip solution by A/D conversion chip by photoelectric detector.
Referring to Fig. 1 and Fig. 3, described control subelement comprises: LCD interface, mouse and keyboard interface, Ethernet interface, ARM-CPU2 chip (control processor), alarm control interface and gsm communication interface, working power.Field signal process subelement, processes temperature signal subelement and control between subelement by SPI interface inter-link.
Wideband light source is connected with forward direction optical fiber; Star coupler is accessed between the optical circulator C of forward direction optical fiber and each sensing head; The output collimator L2 of each sensing head connects reverse transfers optical fiber through light wave multiplexer, and reverse transfers optical fiber is divided into two-way light through the light splitting coupler of monitor, and a road connects the demodulation multiplexer of field signal process subelement; The tunable optic filter of another road jointing temp signal transacting subelement.
The light that described wideband light source (BBS) sends is divided into 12 light paths through star-like fiber coupler, incident each optical temperature magnetic field compound sensor respectively, the centre wavelength of each optical temperature magnetic field compound sensor fiber grating G used is different, therefore the spectral range at compound sensor reflected light place, each optical temperature magnetic field is different, is mapped by the measurement point of measured value with compound sensor place, optical temperature magnetic field accordingly.The light signal reflected from optical temperature magnetic field compound sensor is divided into two-way through fiber coupler, wherein light signal multiplexing for multiple wavelength coverage is separated by tunable optic filter frequency sweep by a road light signal one by one, photoelectric detector carries out the data processings such as each grating peak wavelength shift detection after light signal being converted to electric signal, and then demodulates corresponding sensing point temperature signal.After 12 of different wavelength range light signals are separated by demodulation multiplexer by another road light signal, parallel transmission is converted to 12 electric signal to 12 photoelectric detector converters, respectively 12 electric signal are demodulated to the changes of magnetic field information of each measurement point according to magneto-optic effect principles, play a game with putting a little position by the Partial discharge signal of 12 measured points in data analysis and then search switch cabinet.
The principle that temperature signal detects is:
The temperature detection of switch cubicle utilizes Fiber Bragg Grating FBG (FBG) sensing principle.When the environment temperature at grating place causes fiber grating G structural parameters to change, bragg wavelengths can be caused
bchange, that is changes delta λ of fiber grating G reflection wave centre wavelength
bthe situation of change of temperature can be reflected.If the temperature variation corresponding with wavelength variations is Δ T, then Δ λ
bcan be expressed as with the relation of Δ T
Δλ
B＝f(ΔT)(1)
The funtcional relationship providing formula (1) is demarcated in room by experiment, detects the shifted by delta λ of bragg wavelength when actual measurement
b, just can calculate temperature variation Δ T by the functional relation (1) demarcated.
During measurement, monitor is arranged on Substation control room, wideband light source is by each measurement point of Fiber connection.The reflectance spectrum non-overlapping copies of the Fiber Bragg Grating FBG in the compound sensor of each measurement point optical temperature magnetic field, and in the sweep limit of demodulating unit tunable optic filter.When tunable optic filter scanning wavelength is consistent with Fiber Bragg Grating FBG reflection wavelength, the filter transmission luminous energy that photoelectric detector detects is maximum, the electric signal collecting photoelectric detector output is maximum, and filter scan wavelength is now the actual reflection wave long value of corresponding reflectance spectrum scope grating.Then formula (1) is utilized to solve measurement point temperature information by the actual reflection wavelength offset value of grating.
The principle that field signal detects is:
Magneto-optic element M is in magnetic field, by there is faraday's magneto-optical deflection during magneto-optic element M in linearly polarized light, its plane of polarization will rotate, the angle rotated is called Faraday rotation angle θ, θ and magnetic induction intensity B is proportional: θ=V (T) Bl, wherein V (T) Verdet constant that is magneto-optic element M, l is the logical light length of magneto-optic element M.Angle between the light transmission shaft of analyzer A and the light transmission shaft of polarizer P is 45 °, angle value is converted into output intensity P:
p
0for input light intensity.P is coupled into backward optical fiber through output collimator L2.
Light signal is converted to the electric signal with intensity proportional by photoelectric commutator, then through amplifying circuit output voltage signal u, has:
r is conversion coefficient, relevant with the coupling condition of photoelectric detector parameter and each optical device.U is carried out A/D conversion, by following method demodulation Magnetic Field:
When θ angle is less, formula
can be reduced to:
wherein the 2nd is AC compounent, and the 1st is DC component, is set to u respectively
aC, u
dC.Adopt and exchange item overcomes light source intensity fluctuation impact than DC terms:
wherein:
for the sensing no-load voltage ratio of magnetic field sensing head, temperature influence, just can utilize the temperature-measuring results of grating in the compound sensor of optical temperature magnetic field in the present system and need not consider that extra temperature compensation measure just can realize the Measurement accuracy of field signal.
The generation that office puts will cause the change of field signal, then can determine whether that phenomenon is put in existence office by whether monitoring field signal is abnormal.
The quantity m of monitor determines according to the quantity of switch cubicle.
Referring to Fig. 4, Real-Time Monitoring and the operational management flow process of native system are:
(1) processes temperature signal subelement is by the temperature real time data obtained, and has judged whether that temperaturing lifting abnormality point or temperature exceed threshold point, if had, sends warning message to controlling subelement;
(2) field signal process subelement is by the changes of magnetic field data obtained, and abnormity point is put in the office of having judged whether, if had, sends warning message to controlling subelement;
(3) control subelement except sending local warning and display, send the mobile phone of warning message to operation maintenance personnel, and by Ethernet in station, information and Monitoring Data are sent to operational management server.
(4) operational management server receives real time temperature data and magnetic field data, carry out data analysis and calculating, provide failure analysis report and the report of switch cubicle running status analysis of trend, system cloud gray model and maintenance management daily record, and support remote data access.
In the present embodiment, comprehensive office is adopted to put analytical approach, mainly comprise: first, horizontal analysis method, namely lateral comparison is made to a testing result for switch gear room's breaker in middle cabinet, if the testing result of one of them switch cubicle is greater than the test result of background scene value and other switch cubicle, then can determine this equipment possibility existing defects; The second, trend analysis method, analyzes the testing result of same switch cubicle at different time, carries out the operation trend that longitudinal comparison judges switch cubicle.According to the switch cubicle in specific cycle detection switch gear room, retain each testing result, follow-uply just can to analyze the trend that apparatus local discharge state changes according to testing result; 3rd, threshold value compares, and namely provides judgment threshold, and it made with the testing result of switch cubicle and comparing, analysis result judges the running status of switch cubicle.Can judge according to following basis: in switch gear room, background value and test value are all when below 20dB, switchgear is normal, and next month patrols and examines again; In switch gear room, background value is at below 20dB, and the test value of some switch cubicle is at 20 ~ 30dB, strengthen paying close attention to this switch cubicle, shorten sense cycle, observe the variation tendency of detected amplitude, if background value is at below 20dB in switch gear room, and the test value of some switch cubicle is greater than 30dB, this switch cubicle has partial discharge phenomenon, and location technology should be used to position point of discharge.The present embodiment adopts three to get two principles and determines whether that phenomenon is put in generation office.That is: adopt three kinds of method of discrimination, if two kinds of method judged results are consistent, then this result is verified and adopts.
Claims (7)
1. the online comprehensive monitor system of switch cubicle state of insulation, it is characterized in that, described system comprises the multiple monitoring means be connected with operational management server by Ethernet, each monitoring means comprises monitor, star coupler (SC), light wave multiplexer (OM), with multiple optical temperature magnetic fields compound sensor, the defeated light inlet of described star coupler (SC) connects wideband light source (LS) by optical fiber, the each defeated light-emitting window of star coupler (SC) is connected with a defeated light inlet of light wave multiplexer (OM) by an optical temperature magnetic field compound sensor, the defeated light-emitting window of described light wave multiplexer (OM) is connected with the defeated light inlet of monitor by optical fiber.
2. the online comprehensive monitor system of a kind of switch cubicle state of insulation according to claim 1, it is characterized in that, described optical temperature magnetic field compound sensor comprises optical circulator (C), fiber grating (G), input collimating apparatus (L1), the polarizer (P), magneto-optic element (M), analyzer (A) and output collimator (L2), first light mouth of described optical circulator (C) connects a defeated light-emitting window of star coupler (SC), second light mouth connects fiber grating (G), 3rd light mouth is successively through input collimating apparatus (L1), the polarizer (P), magneto-optic element (M), analyzer (A) is connected with a defeated light inlet of light wave multiplexer (OM) with output collimator (L2), the centre wavelength of multiple optical temperature magnetic field compound sensor fiber grating used (G) is different.
3. the online comprehensive monitor system of a kind of switch cubicle state of insulation according to claim 2, is characterized in that, described monitor judges that the method for switch cubicle state of insulation is:
A. the light signal from multiplexed optical wave device is divided into two-way by monitor, the method of frequency sweep is adopted to be separated to a road light signal wherein, obtain and the light signal corresponding to the centre wavelength of fiber grating in each optical temperature magnetic field compound sensor, and try to achieve the changes delta λ of each fiber grating reflection wave centre wavelength
b, then according to the wavelength variations Δ λ demarcated in advance
band the funtcional relationship Δ λ between temperature variation Δ T
b=f (Δ T)
Extrapolate temperature variation Δ T, thus demodulate the temperature signal of corresponding sensing point; After another road light signal is separated according to the wavelength coverage corresponding to the fiber grating in each optical temperature magnetic field compound sensor, converts every road light signal to voltage signal u, and try to achieve the DC component u of voltage signal u
aCwith AC compounent u
dC, then the magnetic induction density of sensing point is
wherein:
the Verdet constant that V (T) is magneto-optic element;
B. the sensing point temperature of trying to achieve and magnetic induction density and respective threshold value are compared, if temperature and/or magnetic induction density exceed its threshold value, then send corresponding warning message to operational management server.
4. the online comprehensive monitor system of a kind of switch cubicle state of insulation according to claim 3, it is characterized in that, described monitor comprises light splitting coupler (OC), field signal process subelement (UM), processes temperature signal subelement (UT) and controls subelement (UC), and the defeated light inlet of described light splitting coupler (OC) connects the defeated light-emitting window of light wave multiplexer (OM) by optical fiber; Described field signal process subelement (UM) comprises demodulation multiplexer, field signal processor (CPU3) and multiple photoelectric commutator; The defeated light inlet of described demodulation multiplexer connects the first defeated light-emitting window of light splitting coupler (OC), the input end of multiple photoelectric commutator connects the defeated light-emitting window of difference of demodulation multiplexer respectively, the electric signal that each photoelectric commutator exports sends into the input port of field signal processor (CPU3) after amplifying circuit amplifies, and described field signal processor (CPU3) is connected with control subelement (UC) by SPI interface; Described processes temperature signal subelement (UT) comprises tunable optic filter, photoelectric detector and temperature signal processor (CPU1), second defeated light-emitting window of the input termination light splitting coupler (OC) of described tunable optic filter, the control signal through DA conversion that the control end jointing temp signal processor (CPU1) of tunable optic filter exports; The output terminal of the input termination tunable optic filter of described photoelectric detector, the electric signal that photoelectric detector exports first is amplified by amplifying circuit, then after A/D conversion the input port of cut-in temperature signal processor (CPU1); Described temperature signal processor (CPU1) is connected with control subelement (UC) by SPI interface.
5. the online comprehensive monitor system of a kind of switch cubicle state of insulation according to claim 4, it is characterized in that, described control subelement (UC) comprise control processor (CPU2) and be connected with control processor (CPU2) LCD interface, mouse and keyboard interface, Ethernet interface, alarm control interface and gsm communication interface.
6. the online comprehensive monitor system of a kind of switch cubicle state of insulation according to claim 5, is characterized in that, the angle between the light transmission shaft of described analyzer (A) and the light transmission shaft of the polarizer (P) is 45 degree.
7. the online comprehensive monitor system of a kind of switch cubicle state of insulation according to claim 6, is characterized in that, described magneto-optic element (M) adopts BiGd:YIG diaphragm.
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| CN108226819A (en) * | 2016-12-13 | 2018-06-29 | 中国移动通信集团上海有限公司 | A kind of ground magnetic field monitoring system and method based on fiber grating |
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| CN107367658B (en) * | 2017-08-31 | 2024-02-09 | 北京蓝海华业科技股份有限公司 | System for monitoring power equipment |
| CN109471013A (en) * | 2018-10-30 | 2019-03-15 | 北京航空航天大学 | For the pulse testing method of the bandwidth of HCNR200 linear optical coupling isolation circuit |
| CN109828223A (en) * | 2019-01-30 | 2019-05-31 | 兰州大学 | A kind of Fbg Sensor For Measuring Magnetic Field calibration system and method |
| CN110470959A (en) * | 2019-08-27 | 2019-11-19 | 东北电力大学 | A kind of switch cabinet comprehensive on-line monitoring analysis platform |
| CN110687388A (en) * | 2019-11-12 | 2020-01-14 | 保定天威新域科技发展有限公司 | Internal defect detection circuit of converter transformer |
| CN112255517A (en) * | 2020-11-18 | 2021-01-22 | 云南电网有限责任公司临沧供电局 | Local discharge and temperature combined online monitoring system of switch cabinet |
| CN114200272A (en) * | 2022-02-17 | 2022-03-18 | 山东汇能电气有限公司 | Switch cabinet health state operation feedback system based on partial discharge detection |
| CN114200272B (en) * | 2022-02-17 | 2022-04-26 | 山东汇能电气有限公司 | Switch cabinet health state operation feedback system based on partial discharge detection |
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