CN204612672U - A kind of on-line monitoring system of electric power tower tower body structure stress deformation - Google Patents
A kind of on-line monitoring system of electric power tower tower body structure stress deformation Download PDFInfo
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- CN204612672U CN204612672U CN201420849595.3U CN201420849595U CN204612672U CN 204612672 U CN204612672 U CN 204612672U CN 201420849595 U CN201420849595 U CN 201420849595U CN 204612672 U CN204612672 U CN 204612672U
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Abstract
A kind of on-line monitoring system of electric power tower tower body structure stress deformation, comprise fiber Bragg Grating Strain Sensor device, fiber Bragg Grating Strain Sensor device is drawn optical fiber by terminal box and is connected with fiber grating Decoder, fiber grating Decoder is connected with host computer, and host computer is connected with display; Wherein fiber grating Decoder, host computer, display are arranged in transformer station's master-control room.The utility model patent monitoring system is accurate, reliable, more can reflect the complex situations of tower body stress deformation, can realize real time on-line monitoring.
Description
Technical field
The utility model is specifically related to electric power tower tower body structure stress deformation on-line monitoring system, belongs to technical field of electronic measurement.
Background technology
As the important component part of electric power tower, the main equipment structure of tower body specifically refers to four main rod members of tower body space truss, is the stressed main support component of electric power tower, bears the horizontal and vertical load of steel tower entirety.Due to the impact of the disasteies such as earthquake, high wind load, line ice coating, the main material stress and deformation of tower body can obviously increase, and may damage by pressure, draw the phenomenons such as bad, and also can the line-outage contingency of falling tower occur time serious.Under Xie Qiang in 2010 etc. artificially study wind load, ice coating wire dynamic tension is to the dynamic action of Transmission Tower, utilize fiber Bragg Grating Strain Sensor device, recorded the dynamic strain of wire by the wind tunnel test of icing UHV transmission tower split conductor lotus root conjuncted system, unbalanced tensile force is the major reason easily becoming Transmission Tower destruction.Within 2013, Huangping equality people tests the strain of steel tower three billot drag-line by fiber Bragg Grating Strain Sensor device, calculate the amplitude of oscillation of steel tower tower top, incline and surmise error about 1/24000, the requirement of steel tower security alarm can be met, the method that human at periodic intervals tests can be replaced.Therefore, in the operation use procedure of electric power tower, carry out Real-Time Monitoring in the urgent need to a set of real-time, the reliable stress deformation situation of monitoring system to electric power tower tower body.
Summary of the invention
The purpose of this utility model is to provide the optical fiber Bragg raster on-line monitoring system of electric power tower tower body structure stress deformation, and it is measured accurately, more can reflect the complex situations of tower body structure stress deformation, can realize real time on-line monitoring.This system can point out staff to carry out preventative adjustment to the stressed ruuning situation of electric power tower tower body structure, and electric power tower tower body can be avoided to occur because stress deformation increases impact damaging by pressure, drawing the phenomenons such as bad.
Realizing the technical scheme that the utility model object takes is:
A kind of on-line monitoring system of electric power tower tower body structure stress deformation, the utility model feature is: comprise fiber Bragg Grating Strain Sensor device, fiber Bragg Grating Strain Sensor device is drawn optical fiber by terminal box and is connected with fiber grating Decoder, fiber grating Decoder is connected with host computer, and host computer is connected with display; Wherein fiber grating Decoder, host computer, display are arranged in transformer station's master-control room.
The utility model by fiber Bragg Grating Strain Sensor device welded and installed on the surface of the main material of electric power tower tower body, the stress transmission of tower body structure stress deformation is become the wavelength-shift of optical fiber Bragg raster, optical fiber Bragg raster is connected with fiber grating Decoder by drawing optical fiber, utilizes fiber grating Decoder to obtain the shift value of optical fiber Bragg raster centre wavelength.
The best measuring point of fiber Bragg Grating Strain Sensor device described in the utility model is positioned at 1/2 place on the surface of 4 main materials of electric power tower tower body, effectively can obtain the wavelength-shift value of optical fiber Bragg raster more accurately like this.
The utility model on-line monitoring system is particularly applicable in the middle of Dongzhou Period in Chuxiong Yao Zhan 220KV transformer station.
The mathematical model of the fiber Bragg Grating Strain Sensor device that the utility model uses is as follows:
When extraneous axial strain ε acts on sensor both sides ring flange, ring flange spacing variation delta L is ring flange spacing L
1and product between axial strain, that is:
ΔL＝L
1×ε (1)
Ring flange is fixed on stainless-steel tube two ends by screw thread, and ring flange spacing variable quantity is identical with inner stainless-steel tube elongation, and namely inner stainless-steel tube elongation is also Δ L.
Because inner stainless-steel tube middle part caliber is less, cross-sectional area is little; Both sides caliber is comparatively large, and cross-sectional area is large, and deformation mainly occurs in inner stainless-steel tube middle part, and (length is L
2).Ignore the deformation of both sides compared with position, extra heavy pipe footpath stainless-steel tube, in the middle of stainless-steel tube, tubule position elongation is Δ L, that is:
ΔL＝L
2×ε' (2)
Wherein, ε ' is stainless-steel tube middle part dependent variable.
Optical fiber Bragg raster is fixed in inner stainless-steel tube through epoxide-resin glue, and controlling bonding location by the spacing plug of epoxide-resin glue is both sides, stainless-steel tube middle part, and therefore, optical fiber Bragg raster even axial strain occurs and is:
The wavelength-shift that the even axial strain of optical fiber Bragg raster causes is:
In formula (4), λ
bfor the centre wavelength of optical fiber Bragg raster, Δ λ
bfor wavelength-shift amount, P
e=0.22 is valid elastic-optic constants.
Visible, by adjustment ring flange distance L
1happening part size L is strained with inner stainless-steel tube
2between ratio, transducer sensitivity can be increased in right amount.
The beneficial effects of the utility model are:
Achieve the real time on-line monitoring of electric power tower tower body stress deformation, fiber Bragg Grating Strain Sensor device is directly arranged on the surface of the main material of electric power tower tower body by this measuring method, by the amount of deflection of stressed for the strain transducer generation change measurement converted to the centre wavelength of optical fiber Bragg raster is shifted is carried out real-time on-line monitoring to the state of tower body stress deformation, therefore the measurement of this method is more accurate, and every numerical value of monitoring more can reflect the structural health of electric power tower tower body.
Accompanying drawing explanation
Fig. 1 is the installation site of the utility model FBG strain transducer on electric power tower tower body and system building schematic diagram.
Embodiment
Below in conjunction with accompanying drawing 1 and specific embodiment, the utility model is illustrated further.
See Fig. 1, a kind of on-line monitoring system of electric power tower tower body structure stress deformation, the utility model feature is: comprise fiber Bragg Grating Strain Sensor device, fiber Bragg Grating Strain Sensor device is drawn optical fiber by terminal box and is connected with fiber grating Decoder, fiber grating Decoder is connected with host computer, and host computer is connected with display; Wherein fiber grating Decoder, host computer, display are arranged in transformer station's master-control room.
1. by the mode of welded and installed, 4 fiber Bragg Grating Strain Sensor devices are installed on the surface of the main material of tower body 2 left plane girders and the surface of 2 right plane girders respectively.
2. the extraction optical fiber of 4 passages is connected by the mode of welding with the fibre core of optical cable in splice tray, and splice tray is fixed on steel tower tower body.
3. wherein the technical parameter of 4 optical fiber Bragg rasters is: central wavelength lambda
1=1527.000nm, λ
2=1531.000nm, λ
3=1536.000nm, λ
4=1540.000nm.
4. optical cable is introduced transformer station's master-control room by the mode buried underground, then be connected with fiber grating Decoder, thus obtain the centre wavelength shift amount of optical fiber Bragg raster.
5. fiber grating Decoder is connected with host computer, the real-time strain value of tower body main material stress deformation can be calculated by the mathematical model set up, be presented on screen by display, reach the object of Real-Time Monitoring.
The technical solution of the utility model is not limited to the restriction of above-mentioned specific embodiment, and every technology distortion made according to the technical solution of the utility model, all falls within protection domain of the present utility model.
Claims (1)
1. the on-line monitoring system of an electric power tower tower body structure stress deformation, it is characterized in that: comprise fiber Bragg Grating Strain Sensor device, fiber Bragg Grating Strain Sensor device is drawn optical fiber by terminal box and is connected with fiber grating Decoder, fiber grating Decoder is connected with host computer, and host computer is connected with display; Wherein fiber grating Decoder, host computer, display are arranged in transformer station's master-control room.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420849595.3U CN204612672U (en) | 2014-12-29 | 2014-12-29 | A kind of on-line monitoring system of electric power tower tower body structure stress deformation |
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|---|---|---|---|
| CN201420849595.3U CN204612672U (en) | 2014-12-29 | 2014-12-29 | A kind of on-line monitoring system of electric power tower tower body structure stress deformation |
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| CN204612672U true CN204612672U (en) | 2015-09-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106066439A (en) * | 2016-08-15 | 2016-11-02 | 国网山西省电力公司大同供电公司 | A kind of high-tension electricity power transmission line life monitoring system |
| CN106404071A (en) * | 2016-10-28 | 2017-02-15 | 国网四川省电力公司电力科学研究院 | Online transmission line tower state monitoring device and detection method thereof |
-
2014
- 2014-12-29 CN CN201420849595.3U patent/CN204612672U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106066439A (en) * | 2016-08-15 | 2016-11-02 | 国网山西省电力公司大同供电公司 | A kind of high-tension electricity power transmission line life monitoring system |
| CN106404071A (en) * | 2016-10-28 | 2017-02-15 | 国网四川省电力公司电力科学研究院 | Online transmission line tower state monitoring device and detection method thereof |
| CN106404071B (en) * | 2016-10-28 | 2018-02-13 | 国网四川省电力公司电力科学研究院 | Electric power line pole tower state on_line monitoring device and its detection method |
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