CN102494800A - Method of using optical fiber Bragg grating to monitor temperature of intermediate connector of medium-voltage power cable - Google Patents
Method of using optical fiber Bragg grating to monitor temperature of intermediate connector of medium-voltage power cable Download PDFInfo
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- CN102494800A CN102494800A CN2011104003467A CN201110400346A CN102494800A CN 102494800 A CN102494800 A CN 102494800A CN 2011104003467 A CN2011104003467 A CN 2011104003467A CN 201110400346 A CN201110400346 A CN 201110400346A CN 102494800 A CN102494800 A CN 102494800A
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Abstract
The invention relates to a method of using an optical fiber Bragg grating to monitor the temperature of an intermediate connector of a medium-voltage power cable, belonging to the technical field of a photoelectron measuring device. At first, three optical fiber Bragg temperature sensors are fixed on an outer surface of a cold-shrinking insulation component, and and the fixing points respectively correspond to the midpoints of stress cones at the two ends and the midpoint of an intermediate connecting pipe; then the temperature of the stress cones at the two ends and the intermediate connecting pipe in the connector can be calculated according to changes in the value of the wavelength reflected by the optical grating and the relationship between the shifting of the Bragg wavelength of the optical fiber grating temperature sensors and the temperature; and finally the intermediate connector can be judged to be in abnormal operation when one or more sensor(s) is/are in the abnormal state based on comparison of the measured temperature and the normal temperature. The method is suitable for measurement of the temperature of the intermediate connector of the medium-voltage cable, the real-time online measurement of the temperature of the intermediate connector of the power cable can be realized, and errors in measurement resulting from the external ambient temperature can be reduced. Moreover, the method is simple and has high sensitivity.
Description
Technical field
The present invention relates to a kind of method of utilizing optical fiber Bragg raster device monitoring medium-pressure power cable Joint Temperature, belong to the photoelectron field of measuring technique.
Background technology
Growing along with the expansion of electrical equipment capacity and total social demand electric weight; Power cable has become the blood artery that transmits electric power; Usually long-term operation continuously under high voltage, big electric current, the power cable intermediate head is a weakest link, breaks down easily.All surperficial according to practical operating experiences and theoretical analysis; The fault that takes place in power cable intermediate head place often is not the accident of a burst; Be because the power cable intermediate head constantly raises because of various fault generating great amount of heat make the temperature of joint, aging, the earial drainage current step of accelerating cable insulation material increase, and finally cause thermal breakdown or cable fire; In case taking place to influence, this accident supplies power normally and the stability of electrical network; Cause the paralysis and the enormous economic loss of electric system, therefore the monitoring to cable intermediate joint is very necessary, has great importance.
Thermometric to cable intermediate joint has electronic measuring method that adopts wireless transmission and the measuring method that sensor is installed in the joint outside surface at present.The electronic measuring method of employing wireless transmission receives big electric current, the high-intensity magnetic field influence of cable itself easily, and measurement result is not accurate enough, and the distance of transmission of wireless signals is limited; Adopt sensor to be installed in the measuring method of joint outside surface, the sensor ratio is easier to receive influences such as ambient temperature, cross-ventilation, finally produces measuring error.
With the immediate technology of the inventive method be Zhou Xiaowei, " the temperature measurement on-line method and the device thereof of cable joint of high-voltage plant ", application number is 200810124298.1.This measuring method is: the employing temperature sensor is installed in the surface of metallic conductor, through the wireless launcher transmission signals.This method receives big electric current, the high-intensity magnetic field influence of cable itself easily, and measurement result is not accurate enough.
Summary of the invention
The invention provides a kind of method of utilizing optical fiber Bragg raster monitoring medium-pressure power cable Joint Temperature, realize the real time on-line monitoring to medium voltage electricity cable intermediate joint temperature, accuracy is high.
The present invention realizes through following technical scheme: the outside surface that at first is fixed on three Fiber Bragg Grating Temperature sensors shrinkage insulating part 1; And the mid point of the positive opposite ends stress cone 2 of point of fixity difference and the mid point of intermediate connection tube 3; Then according to the variation of the wavelength value of optical grating reflection; Through the displacement and the variation of temperature relation of fiber-optical grating temperature sensor Bragg wavelength, calculate the temperature of inner two ends stress cone of joint and intermediate connection tube; Contrast according to measured temperature and conventional temperature at last,, can judge that intermediate head is in the non-normal working situation as wherein arbitrary and above appearance are unusual.
Described shrinkage insulating part 1 belongs to the part of joint, and there are stress cone 2 and intermediate connection tube 3 in the inside.
The selection of said temperature measurement location: concentrate the place the most because the two ends stress cone is an electric field line; Intermediate connection tube is the contact resistance maximum; As big electric current and high-tension electricity through intermediate head; Stress cone and intermediate connection tube break down the most easily at two ends, and perhaps the operation of stress cone body manufacturing defect, cable overburden also can initiating failure, before breaking down, normally show with the form of temperaturing lifting abnormality.So, can grasp the operation conditions of intermediate head more all sidedly, avoided fault, and finally caused cable fire, partial electric grid paralysis because of the intermediate head initiation through the temperature at monitoring two ends stress cone and intermediate connection tube place.
Said Fiber Bragg Grating Temperature Selection of Sensor: can select common Fiber Bragg Grating Temperature sensing for use.
Fixing of said Fiber Bragg Grating Temperature sensor: the outside surface that can be fixed on three Fiber Bragg Grating Temperature sensors shrinkage insulating part 1 through epoxy resin; And point of fixity is distinguished the mid point of positive opposite ends stress cone 2 and the mid point of intermediate connection tube 3, can adopt other fixed form sensor.
The mathematical model of the present invention's technology is following:
The temperature transfer of intermediate head is to the Fiber Bragg Grating Temperature sensor, the variation of grating reflection peak wavelength.The peak wavelength that reflects satisfies:
(1) formula is carried out the temperature T differentiate can be got:
(2)
(2) the formula both sides can obtain divided by (1) formula
(3)
In (3) formula,
is the thermo-optical coeffecient of fiber grating;
is the thermal expansivity of fiber grating; Generally speaking concerning fused quartz optical fiber;
,
.
(3) formula is carried out conversion, can obtain
In (4) formula;
is with respect to the temperature change value of demarcating;
is wavelength change;
is timing signal centre wavelength, and this drift and variation of temperature that shows fiber-optical grating temperature sensor Bragg wavelength is linear.
Through the displacement and the variation of temperature relation of fiber-optical grating temperature sensor Bragg wavelength, calculate the temperature of each sensor.Because it is 90 ℃ that crosslinked cable allows the maximum temperature of long-term work, when the temperature of three sensors have one near or surpass 90 ℃ and should attract great attention, this shows that joint is under the non-normal working situation, should butt junction carry out emergent management.
Beneficial effect of the present invention:
1, adopt three optical fiber Bragg grating sensors of serial connection to detect the two ends stress cone of medium-pressure power cable intermediate head and the temperature of middle junction; Grasp joint temperature rise situation more all sidedly; For the health status of judging joint provides judgement; Can eliminate the thermal breakdown or the cable fire accident of medium-pressure power cable intermediate head, realize real-time online measuring, can in time understand the ruuning situation of power cable intermediate head Power Cable Joint Temperature;
2, adopt the outside surface that is installed in the Fiber Bragg Grating Temperature sensor shrinkage part, the measuring error that produces because of the ambient temperature factor can have been reduced like this in the inside of cable splice;
3, the present invention adopts the optical fiber Bragg raster means to measure, volume is little, bandwidth is wide, anti-electromagnetic interference capability is strong and corrosion-resistant outside, Wavelength-encoding has absolute measurement, accuracy is high.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is first kind of fiber Bragg arrangement of temperature sensor synoptic diagram provided by the invention;
Fig. 3 is that three identical sensor serial connections provided by the invention are the structural representation of one;
Fig. 4 is second kind of fiber Bragg arrangement of temperature sensor synoptic diagram provided by the invention.
Among the figure: 1-shrinkage insulating part, 2-stress cone, 3-intermediate connection tube, 4-optical fiber Bragg raster, 5-capillary brass pipe, 6-polyimide sleeve pipe, 7-fiber pigtail, 8-annular metal sheet.
Embodiment
Below in conjunction with accompanying drawing and embodiment, this method is described further:
Embodiment 1
As shown in Figure 1: the outside surface that can be fixed on three Fiber Bragg Grating Temperature sensors shrinkage insulating part 1 through epoxy resin; And the mid point of the positive opposite ends stress cone 2 of point of fixity difference and the mid point of intermediate connection tube 3; Then according to the variation of the wavelength value of optical grating reflection; Through the displacement and the variation of temperature relation of fiber-optical grating temperature sensor Bragg wavelength, calculate the temperature of inner two ends stress cone of joint and intermediate connection tube; Contrast according to measured temperature and conventional temperature at last,, can judge that intermediate head is in the non-normal working situation as wherein arbitrary and above appearance are unusual.
Said Fiber Bragg Grating Temperature Selection of Sensor: can select common Fiber Bragg Grating Temperature sensing for use.
Embodiment 2
In order better to realize said method the invention provides a kind of fiber Bragg temperature sensor.
As shown in Figure 2: as to comprise optical fiber Bragg raster 4, capillary brass pipe 5, teflon sleeve 6, fiber pigtail 7; Adopt epoxy resin closely to be fixed on optical fiber Bragg raster 4 in the capillary brass pipe 5, fiber pigtail 7 strings in teflon sleeve, and through epoxy resin teflon sleeve 6 and capillary brass pipe 5 through connecting as one.
As shown in Figure 3: is the Fiber Bragg Grating Temperature sensor of three serial connections to be one by serial connection, is fixed on the outside surface of shrinkage insulating part 1, and the point of fixity mid point of positive opposite ends stress cone 2 and the mid point of intermediate connection tube 3 respectively; According to the variation of the temperature of three monitoring points to grating wavelength; Then according to the variation of the wavelength value of optical grating reflection; Through the displacement and the variation of temperature relation of fiber-optical grating temperature sensor Bragg wavelength, calculate the temperature of inner two ends stress cone of joint and intermediate connection tube; Contrast according to measured temperature and conventional temperature at last,, can judge that intermediate head is in the non-normal working situation as wherein arbitrary and above appearance are unusual.
Embodiment 3
In order better to realize said method, the present invention improves above-mentioned fiber Bragg temperature sensor again, and is as shown in Figure 4: comprise optical fiber Bragg raster 4, capillary brass pipe 5, polyimide sleeve pipe 6, fiber pigtail 7, annular metal sheet 8 compositions; Pass through epoxy encapsulation to optical fiber Bragg raster 4 in capillary brass pipe 5, and capillary brass pipe 5 is one-body molded with annular metal sheet 8, connects as one, adopts epoxy resin to be tightly connected capillary brass pipe 5 and the polyimide sleeve pipe 6 that is enclosed within on the fiber pigtail 7.
The annular metal sheet can be selected steel for use, and copper etc. wherein are preferably the big copper product of expansion coefficient (thermal expansivity be 0.189 * 10-4m/℃).
The Fiber Bragg Grating Temperature sensor of three serial connections is fixed on the outside surface of shrinkage insulating part 1, and the ring-type copper sheet of each sensor just in time is stuck in the mid point of two ends stress cone and the mid point of intermediate connection tube.
Adopt its advantage of annular metal sheet to be: to adopt the annular metal sheet to be close to the outside surface of shrinkage insulating part; Increased the contact area of sensor and joint; The heat of having eliminated because of hot transmission loss causes measuring error; The temperature that more can accurately reflect whole joint, the health status of understanding joint.
According to the variation of the temperature of three monitoring points to grating wavelength; Then according to the variation of the wavelength value of optical grating reflection; Through the displacement and the variation of temperature relation of fiber-optical grating temperature sensor Bragg wavelength, calculate the temperature of inner two ends stress cone of joint and intermediate connection tube; Contrast according to measured temperature and conventional temperature at last,, can judge that intermediate head is in the non-normal working situation as wherein arbitrary and above appearance are unusual.
The present invention describes through the practical implementation process; Without departing from the present invention; Can also carry out various conversion and be equal to replacement patent of invention; Therefore, patent of the present invention is not limited to disclosed practical implementation process, and should comprise the whole embodiments that fall in the Patent right requirement scope of the present invention.
Claims (1)
1. method of utilizing optical fiber Bragg raster monitoring medium-pressure power cable Joint Temperature; It is characterized in that: at first be fixed on three fiber Bragg temperature sensors the outside surface of shrinkage insulating part, and the mid point of the positive opposite ends stress cone of point of fixity difference and the mid point of intermediate connection tube; According to the variation of the wavelength value of optical grating reflection,, calculate the temperature of inner two ends stress cone of joint and intermediate connection tube then through the displacement and the variation of temperature relation of fiber-optical grating temperature sensor Bragg wavelength; Contrast according to measured temperature and conventional temperature at last,, can judge that intermediate head is in the non-normal working situation as wherein arbitrary and above appearance are unusual.
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| CN2011104003467A CN102494800A (en) | 2011-12-06 | 2011-12-06 | Method of using optical fiber Bragg grating to monitor temperature of intermediate connector of medium-voltage power cable |
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| CN2011104003467A CN102494800A (en) | 2011-12-06 | 2011-12-06 | Method of using optical fiber Bragg grating to monitor temperature of intermediate connector of medium-voltage power cable |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547377A (en) * | 2016-03-10 | 2016-05-04 | 西安天力金属复合材料有限公司 | Testing method of sheet metal explosive welding dynamic parameters |
| CN105716740A (en) * | 2016-04-12 | 2016-06-29 | 深圳市深电电力设备发展有限公司 | Electric power sheath having temperature measurement function |
| CN107884080A (en) * | 2017-12-15 | 2018-04-06 | 安徽龙联智能光电有限公司 | A kind of cable optic fibre adapter assembly |
Citations (4)
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|---|---|---|---|---|
| JP2764666B2 (en) * | 1992-02-21 | 1998-06-11 | 株式会社フジクラ | Optical fiber composite cable connection |
| CN101414034A (en) * | 2008-11-13 | 2009-04-22 | 北京兴迪仪器有限责任公司 | Built-in temperature measuring optical cable |
| CN101459329A (en) * | 2007-12-13 | 2009-06-17 | 上海波汇通信科技有限公司 | Middle joint of high voltage electric cable for connecting composite optical fiber and connecting method |
| US20100139974A1 (en) * | 2008-12-09 | 2010-06-10 | Abb Research Ltd | Flexible joint with resistive field grading material for hvdc cables and method for connecting same to hvdc cables |
-
2011
- 2011-12-06 CN CN2011104003467A patent/CN102494800A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2764666B2 (en) * | 1992-02-21 | 1998-06-11 | 株式会社フジクラ | Optical fiber composite cable connection |
| CN101459329A (en) * | 2007-12-13 | 2009-06-17 | 上海波汇通信科技有限公司 | Middle joint of high voltage electric cable for connecting composite optical fiber and connecting method |
| CN101414034A (en) * | 2008-11-13 | 2009-04-22 | 北京兴迪仪器有限责任公司 | Built-in temperature measuring optical cable |
| US20100139974A1 (en) * | 2008-12-09 | 2010-06-10 | Abb Research Ltd | Flexible joint with resistive field grading material for hvdc cables and method for connecting same to hvdc cables |
Non-Patent Citations (2)
| Title |
|---|
| 吴畏等: "110kv高压电力电缆中间接头电场－温度场的仿真分析", 《传感器与微系统》, vol. 30, no. 8, 31 August 2011 (2011-08-31) * |
| 王海宝: "分布式光纤布拉格光栅电缆接头温度监测系统的研究", 《中国优秀硕士学位论文全文数据库（信息科技辑）》, no. 7, 15 July 2010 (2010-07-15) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547377A (en) * | 2016-03-10 | 2016-05-04 | 西安天力金属复合材料有限公司 | Testing method of sheet metal explosive welding dynamic parameters |
| CN105716740A (en) * | 2016-04-12 | 2016-06-29 | 深圳市深电电力设备发展有限公司 | Electric power sheath having temperature measurement function |
| CN105716740B (en) * | 2016-04-12 | 2019-03-01 | 深圳市深电电力设备发展有限公司 | A kind of electric power sheath with temp sensing function |
| CN107884080A (en) * | 2017-12-15 | 2018-04-06 | 安徽龙联智能光电有限公司 | A kind of cable optic fibre adapter assembly |
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Application publication date: 20120613 |