CN103913251A - Cable temperature measuring system of internal optical fibers - Google Patents
Cable temperature measuring system of internal optical fibers Download PDFInfo
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- CN103913251A CN103913251A CN201410077722.7A CN201410077722A CN103913251A CN 103913251 A CN103913251 A CN 103913251A CN 201410077722 A CN201410077722 A CN 201410077722A CN 103913251 A CN103913251 A CN 103913251A
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Abstract
The invention discloses a cable temperature measuring system of internal optical fibers. The cable temperature measuring system comprises a cable operation control host computer 1, wherein the cable operation control host computer 1 controls a power unit 2 to supply power to a plurality of cables 3, the cable operation control host computer 1 is further connected with a current signal collecting device measuring load current data of the cables 3, and the cable operation control host computer 1 is further connected with a cable temperature measuring device. The cable temperature measuring system has the advantages that measuring accuracy is achieved, and safety of remote power transmission is effectively guaranteed.
Description
Technical field
The present invention relates to the cable temp measuring system of technology of transmission of electricity application, particularly a kind of built-in fiber.
Background technology
Along with the great-leap-forward development of Chinese national economy, every profession and trade and the also sharp increase of residential electricity consumption demand, for bringing into play to greatest extent the power supply capacity of existing power cable, make the economic operation cost of power supply enterprise reach optimization, in the urgent need to grasping at any time power cable ruuning situation, so that under the prerequisite of guaranteeing power supply safety, farthest excavate the power supply capacity of existing power cable.In addition, cable lay environment and there is very big-difference in mode, the temperature rise along the line of whole piece cable is different, the key that affects current-carrying capacity of cable is the temperature bottleneck of cable, finds and solve temperature bottleneck and can greatly improve the current-carrying capacity of whole piece cable.The existing relevant report that distributed optical fiber temperature measurement technology is applied to cable temperature on-line monitoring both at home and abroad, but many employings are laid in cable surface by optical fiber and carry out the monitoring of cable operating temperature, not only difficulty of construction is large, and measurement data is subject to extraneous factor impact, affects measuring accuracy.
Summary of the invention
The present invention, in order to address the above problem, has designed a kind of cable temp measuring system of built-in fiber.
The object of the invention is to utilize Fiber Optic Pyrometer, at the outer field optical fiber of cable insulation, measure insulating outer layer temperature by pre-plugged.Whole system can in real time, accurately be grasped cable operating temperature, realizes according to the conveying electric current of cable operating temperature control cables, has changed traditional method of carrying electric current according to design rated current-carrying capacity control cables, gives full play to the transport capacity of cable; Can find in time the cable operational defect relevant with heat, and send early warning signal, guarantee cable running safety.
Realizing above-mentioned purpose technical scheme of the present invention is, a kind of cable temp measuring system of built-in fiber, comprise cable operation main control system 1, cable operation main control system 1 is controlled power unit 2 and is transmitted electricity to multi-cable 3, cable operation main control system 1 is also connected with the current signal harvester of measuring multi-cable 3 load current data, and cable operation main control system 1 is also connected with cable temperature measuring equipment.
Described current signal harvester is to be connected and composed with current signal inductor 5 two parts that are enclosed within on cable 3 outside surfaces by current signal sampling main frame 4.
Described cable temperature measuring equipment is to be connected and composed with the optical fiber 8 of multi-cable 3 inside that are laid in respectively by light path change-over switch 7 by optical-fiber temperature measuring main frame 6.
Described optical fiber 8 is double channel optical fiber.
Described optical fiber 8 is in cable 3 in the buffer area between insulation course 9.
Described optical fiber 8 is by snakelike being fixed in cable 3 in the buffer area between insulation course 9 of double-deck waterstop 10.
Utilize the cable temp measuring system of the built-in fiber of technical scheme making of the present invention, this system, for many cable lines of electric power system, covers 35kV, 110kV, tri-electric pressures of 220kV.System can in real time, accurately be grasped cable operating temperature, realizes according to the conveying electric current of cable operating temperature control cables, has changed traditional method of carrying electric current according to design rated current-carrying capacity control cables, more can give full play to the transport capacity of cable; Can find in time the cable operational defect relevant with heat, and send early warning signal, guarantee cable running safety.
Accompanying drawing explanation
Fig. 1 is the structural representation of the cable temp measuring system of built-in fiber of the present invention;
Fig. 2 is the schematic diagram that lays of cable built-in fiber of the present invention;
Fig. 3 is the schematic diagram of cable cross-section of the present invention;
In figure, 1, cable operation main control system; 2, power unit; 3, cable; 4, current signal sampling main frame; 5, current signal inductor; 6, optical-fiber temperature measuring main frame; 7, light path change-over switch; 8, optical fiber; 9, insulation course; 10, double-deck waterstop.
Embodiment
Below in conjunction with accompanying drawing, the present invention is specifically described, as shown in Figure 1, Figure 2, Figure 3 shows, a kind of cable temp measuring system of built-in fiber, comprise cable operation main control system 1, cable operation main control system 1 is controlled power unit 2 and is transmitted electricity to multi-cable 3, cable operation main control system 1 is also connected with the current signal harvester of measuring multi-cable 3 load current data, and cable operation main control system 1 is also connected with cable temperature measuring equipment.Wherein, described current signal harvester is to be connected and composed with current signal inductor 5 two parts that are enclosed within on cable 3 outside surfaces by current signal sampling main frame 4; Described cable temperature measuring equipment is to be connected and composed with the optical fiber 8 of multi-cable 3 inside that are laid in respectively by light path change-over switch 7 by optical-fiber temperature measuring main frame 6; Described optical fiber 8 is double channel optical fiber; Described optical fiber 8 is in cable 3 in the buffer area between insulation course 9; Described optical fiber 8 is by snakelike being fixed in cable 3 in the buffer area between insulation course 9 of double-deck waterstop 10.
The cable temp measuring system of built-in fiber of the present invention, its embodiment is:
One, optical fiber lays
In cable process, optical fiber is inserted to cable cushion, for when the cable bend, optical fiber can be stretched thereupon, contract, be positioned over directly over cable core snakelike optical fiber, and cover two-layer waterstop at optical fiber surface, in crowded aluminium process, optical cable surface temperature is no more than its maximum allowable temperature, as shown in Figure 2.Optical fiber is embedded in to cable cushion, can effectively reduces the impact of various extraneous factors on temperature-measuring optical fiber and measuring accuracy in cable laying and measuring process, improve monitoring accuracy, reduce difficulty of construction.
Two, optical fiber temperature-measurement
According to Raman scattering theory, under natural Raman scattering condition, the catoptrical light intensity of two bundles is relevant with temperature.In order to eliminate the impact such as loss of unstable, fibre-optical bending joint of laser tube output, improve thermometric accuracy, in system, adopt the method for binary channels dual wavelength comparison, as shown in Figure 1, stokes light and anti-Stokes light are gathered respectively, utilize the ratio demodulation temperature signal of both intensity.Because anti-Stokes light is more sensitive to temperature, therefore, using anti-Stokes light as signalling channel, stokes light is passage as a comparison, and strength ratio is between the two:
Is and Ia are respectively Stokes and anti-Stokes light intensity;
λ s is Stokes optical wavelength;
λ a is anti-Stokes optical wavelength;
H is Planck's constant, and c is the light velocity in vacuum;
κ is to be Boltzmann constant;
V
0light frequency is penetrated in behaviour;
T is absolute temperature.
From formula, can find out, R (T) is only relevant with temperature T, and light intensity, incident condition, fiber geometries size and optical fiber composition are irrelevant.Therefore, can realize the measurement of temperature by the ratio of surveying anti-Stokes and Stokes backward Raman scattering light intensity.
Three, conductor temperature calculates
According to construction of cable feature, the axial thermal conductivity of cable can be ignored, only consider radially heat conduction, set up UNSTABLE TEMPERATURE FIELD difference equation, the cylinder interface of unit wall thickness of heat and endogenous pyrogen thermal value sum import into by to(for) the unit interval equal this unit self-energy rate over time.?
ρ represents the density of material in computing unit;
C represents the specific heat capacity of material in computing unit;
λ represents the coefficient of heat conductivity of material in computing unit;
(n+1) and (n) represent respectively (n+1) and (n) individual calculating is instantaneous;
The Δ τ representation unit time;
Q representation unit cylinder endogenous pyrogen heating power;
represent that respectively radius is the temperature in the unit cylinder of r and on surfaces externally and internally
Utilize above formula can calculate (n+1) instantaneous node temperature T (n+1).
Four, software and hardware system
Thermometric main frame adopts BW6000, communications protocol adopts IEC61850, data processing adopts in real time/historical data treatment technology, system provides good intelligent electronic device interoperability interface, can improve the integrated of data message, reduce the expenses such as quantities, onsite acceptance, operation, supervision, diagnosis and maintenance, save the plenty of time, increase the dirigibility between the system operating period.
Carry out in the process of circulation test at 220kV cable line A phase cable sheath, staff finds that this cable sheath circulation is bigger than normal, and the monitoring result of native system shows: cable has a few point insulating temperature drifts along the line.Check with testing crew subsequently, prove that insulation temperature drift point is corresponding circulation interval bigger than normal, reason is that cable jacket breaks, and armor ground connection causes the interior circulation of cable armor excessive, causes that cable external insulation temperature raises.Therefore temperature-distance Curve that staff can reflect according to native system main frame is further dwindled fault coverage, shortens fault handling time.
Technique scheme has only embodied the optimal technical scheme of technical solution of the present invention, and those skilled in the art have all embodied principle of the present invention to some variations that wherein some part may be made, within belonging to protection scope of the present invention.
Claims (6)
1. the cable temp measuring system of a built-in fiber, comprise cable operation main control system (1), it is characterized in that, cable operation main control system (1) is controlled power unit (2) and is transmitted electricity to multi-cable (3), cable operation main control system (1) is also connected with the current signal harvester of measuring multi-cable (3) load current data, and cable operation main control system (1) is also connected with cable temperature measuring equipment.
2. the cable temp measuring system of built-in fiber according to claim 1, it is characterized in that, described current signal harvester is to be connected and composed by current signal sampling main frame (4) and current signal inductor (5) two parts of being enclosed within on cable (3) outside surface.
3. the cable temp measuring system of built-in fiber according to claim 1, it is characterized in that, described cable temperature measuring equipment is to be connected and composed with the optical fiber (8) of the multi-cable that is laid in (3) inside respectively by light path change-over switch (7) by optical-fiber temperature measuring main frame (6).
4. the cable temp measuring system of built-in fiber according to claim 3, is characterized in that, described optical fiber (8) is double channel optical fiber.
5. the cable temp measuring system of built-in fiber according to claim 3, is characterized in that, described optical fiber (8) is arranged in the buffer area between cable (3) insulation course (9).
6. the cable temp measuring system of built-in fiber according to claim 5, it is characterized in that, described optical fiber (8) is by snakelike being fixed in the buffer area between the middle insulation course (9) of cable (3) of double-deck waterstop (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410077722.7A CN103913251A (en) | 2014-02-28 | 2014-02-28 | Cable temperature measuring system of internal optical fibers |
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| CN201410077722.7A CN103913251A (en) | 2014-02-28 | 2014-02-28 | Cable temperature measuring system of internal optical fibers |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266778A (en) * | 2014-09-11 | 2015-01-07 | 深圳供电局有限公司 | Remote dynamic monitoring system for temperature of cable group wire cores |
| CN104852169A (en) * | 2015-05-19 | 2015-08-19 | 深圳市沃尔核材股份有限公司 | Intelligent and accurate temperature measurement separable cable connector |
| CN106225950A (en) * | 2016-08-08 | 2016-12-14 | 国网江苏省电力公司徐州供电公司 | A kind of power cable distributed temperature measuring system based on photoswitch |
| CN108693445A (en) * | 2018-05-23 | 2018-10-23 | 广东电网有限责任公司 | Fault positioning method and device for power transmission cable |
| CN111964805A (en) * | 2020-08-17 | 2020-11-20 | 重庆工程职业技术学院 | Temperature measuring device for high-temperature superconducting cable |
| CN113884215A (en) * | 2021-09-29 | 2022-01-04 | 国网新疆电力有限公司阿勒泰供电公司 | Cable fire monitoring system based on grating array sensing optical cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104266778A (en) * | 2014-09-11 | 2015-01-07 | 深圳供电局有限公司 | Remote dynamic monitoring system for temperature of cable group wire cores |
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| CN106225950A (en) * | 2016-08-08 | 2016-12-14 | 国网江苏省电力公司徐州供电公司 | A kind of power cable distributed temperature measuring system based on photoswitch |
| CN108693445A (en) * | 2018-05-23 | 2018-10-23 | 广东电网有限责任公司 | Fault positioning method and device for power transmission cable |
| CN111964805A (en) * | 2020-08-17 | 2020-11-20 | 重庆工程职业技术学院 | Temperature measuring device for high-temperature superconducting cable |
| CN113884215A (en) * | 2021-09-29 | 2022-01-04 | 国网新疆电力有限公司阿勒泰供电公司 | Cable fire monitoring system based on grating array sensing optical cable |
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Application publication date: 20140709 |