CN203310540U - Temperature and strain on-line monitoring device integrating optical phase conductors - Google Patents

Abstract

The utility model provides an on-line monitoring device for temperature and strain fused with optical fiber composite phase lines. The device includes a data measurement and management platform, a monitoring computer, an OPPC optical cable and a joint box thereof, and the OPPC optical cable passes through the joint Two OPPC optical cables connected to the middle joint box of the box, the other end of one of the OPPC optical cables is connected to the terminal joint box of the joint box; the other end of the terminal joint box is connected to the data measurement and management platform through the ADSS cable , the other end of the data measurement and management platform is connected to the monitoring computer. The device realizes the temperature measurement, stress and strain, power transmission, and communication functions of one wire, and provides early warning of faults such as line overtemperature, fatigue broken strands, and fiber core stress, and improves the performance of the sensor of the transmission line status monitoring system.

Description

A temperature and strain on-line monitoring device with fusion of optical fiber composite phase line

technical field

The utility model relates to a monitoring device in the field of power transmission and transformation monitoring, in particular to an on-line temperature and strain monitoring device fused with an optical fiber composite phase line (OPPC). the

Background technique

With the continuous optimization of the power grid structure, the area covered by the transmission line is getting wider and wider, and the safe operation of the line is also facing more problems. External force damage is the most important aspect of power line operation accidents. The main factors are line wind dance, line icing, tree branches and foreign objects hanging on wires, etc. External force damage accidents are likely to cause broken strands of transmission line conductors, damage to hardware, and tower tilting and collapse, resulting in permanent faults and long-term interruption of line power supply, endangering the safe operation of the power grid, and its harmfulness and economic losses are huge. Moreover, the vast majority of transmission lines currently in operation still use the traditional maintenance methods of strong line inspection and emergency repair after accidents, without adopting advanced online monitoring methods. This line maintenance method is no longer suitable for modern society. Requirements for power supply quality, It is necessary to study automatic monitoring technology to replace human maintenance lines. the

The high-voltage cable has a large load and a high calorific value, and its surface temperature can truly reflect the actual operation of the cable, such as overload operation, cable insulation failure, etc. On-line real-time monitoring of line operation based on temperature information is an important means to achieve daily cable repair and maintenance, cable fault early warning and diagnosis, line accident investigation and emergency response. At the same time, through the cable temperature, combined with the sensor data of sunshine, ambient temperature and wind force, the maximum allowable current carrying capacity of the cable can be accurately analyzed and calculated, providing scientific data basis for reasonable load allocation. the

At present, the online strain monitoring of transmission lines usually adopts the point strain measurement method, mainly laying strain monitoring sheets on the pole tower, tension tower and joint tower fittings to monitor the stress and strain of the metal body, so as to calculate the force change of the transmission line and the degree of external damage. However, the survey found that although the existing strain monitoring devices for transmission lines have been applied, they have not been widely used, and there are problems in measurement technology, theoretical calculation and engineering cost. Moreover, in practical applications, there are some differences between the on-site meteorological conditions and the simulation conditions of laboratory tests, and there are consistency problems in practical applications. On-line monitoring of the temperature of high-voltage cables, including cables and overhead conductors, is usually distributed with various contact and non-contact sensors, and wireless communication technology is used to transmit signals. It is not easy to implement on site due to problems such as power supply, insulation, and communication transmission. the

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the utility model proposes a temperature and strain on-line monitoring device that fuses the optical fiber composite phase line, the device includes a data measurement and management platform, a monitoring computer, an OPPC optical cable and a splice box thereof, Its improvement is that: the OPPC optical cable is two OPPC optical cables connected by the intermediate splice box of the splice box, wherein the other end of one of the OPPC optical cables is connected with the terminal splice box of the splice box;

The other end of the terminal splice box is connected to the stress-strain tester and the distributed temperature tester of the data measurement and management platform respectively through an ADSS cable, and the other end of the stress-strain tester and the distributed temperature tester are respectively connected to the The data measurement is connected with the local data server of the management platform; the other end of the local data server is connected with the monitoring computer. the

Further, the OPPC optical cable is an OPPC optical cable with simultaneous sensing of temperature and stress strain including an optical unit, a steel core and an aluminum wire;

The optical unit includes an optical fiber, a protective tube for the optical fiber and ointment filled in the protective tube;

The optical unit has a built-in multimode optical fiber and a series of stress and strain monitoring optical fiber excess lengths with a fixed value for the excess length of the typical optical fiber;

The steel core is aluminum clad steel or galvanized steel; the aluminum wire is aluminum alloy. the

Further, the local data server includes a database for storing data and a stress-strain calculation module for calculating strain data of optical fibers. the

Further, the stress and strain tester is a BOTDR optical fiber sensing device for testing temperature and strain information; the distributed temperature tester is a DTS optical fiber sensing device for testing temperature information. the

Further, the local data server is a server that records the stress-strain data and temperature data collected from the stress-strain tester and the distributed temperature tester. the

Further, the ADSS optical cable is hanged in the air or buried in the cable trench. the

Further, the OPPC optical cable can be used for voltages of different levels from 10kv to 500kv. the

Compared with existing devices, the beneficial effects achieved by the utility model are:

(1) Realize one wire to complete temperature measurement, stress and strain, power transmission, and communication functions, and provide early warning of faults such as line overtemperature, fatigue strand breakage, and fiber core stress, which improves the overall performance of OPPC applications; The influence of various factors such as intensity and wind speed on OPPC temperature measurement can improve the performance of the sensor of the transmission line status monitoring system. the

(2) Use ROTDR technology to realize distributed temperature monitoring of OPPC lines, subtract temperature data from BOTDR measurement matrix data, thereby removing temperature influencing factors in BOTDR stress and strain measurement data of OPPC lines, and improve the accuracy of stress and strain measurement of OPPC lines . the

(3) A new type of OPPC optical cable with simultaneous sensing of temperature and stress and strain is proposed. The designed optical cable is pre-twisted with multi-mode optical fiber and single-mode optical fiber to realize simultaneous detection of temperature and strain. In full consideration of the cable line during production and transportation On the basis of the line deformation in various links such as installation, operation, and maintenance, a set of optical fiber excess length series is formulated to evaluate the health status of the transmission line. the

(4) Proposed a variety of state monitoring schemes for transmission lines based entirely on optical fiber sensing, trying to solve the problems of icing on transmission lines, fatigue strand breaks, lightning strike strand breaks, and deterioration of the mechanical performance of the fiber core in optical fiber joint boxes, as well as the realization of transmission line OPGW , On-line monitoring of OPPC optical cable line galloping, wind pressure stretching, temperature rise stretching, etc. the

(5) OPPC-based cables have good corrosion resistance and can increase the service life of the system; at the same time, they have good thermal stability to ensure reliable and accurate temperature measurement results. the

Description of drawings

Figure 1 is a diagram of the on-line monitoring device for temperature and strain of the fusion fiber composite phase line;

Figure 2 is an OPPC optical cable with integrated temperature and strain sensing functions;

Fig. 3 is the OPPC schematic diagram of temperature measurement strain sensor;

Fig. 4 is the temperature elimination algorithm diagram of Brillouin measurement data;

Reference signs:

1-OPPC optical cable I; 2-OPPC optical cable II, 3-intermediate connector box; 4-terminal connector box; 5-ADSS cable; 6-stress and strain tester; 7-distributed temperature tester; 8-local data Server; 9-monitoring computer; 10-aluminum-clad steel wire; 11-optical unit (OP) with excess fiber length; 12-aluminum wire; 13-multimode optical fiber for temperature measurement; 14-specific fiber length; 15-specific fiber length ; 16-Specific fiber excess length; 17-Stress and strain calculation module. the

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail;

As shown in Figure 1, Figure 1 is a diagram of an on-line monitoring device for fusion fiber composite phase line temperature and strain. The new OPPC optical cable structure 1. BOTDR (Brillouin Scattered Light Time Domain Reflectometry Technology) Stress and Strain Tester 6. DTS (Optical Distributed Temperature Monitoring) Distributed Temperature Tester 7. OPPC Intermediate Joint Box 3. OPPC Terminal Splice box 4, ADSS optical cable 5, local data server 8 and its stress and strain calculation module 17, and user monitoring terminal 9. the

1. Device connection

The monitoring computer 9 is connected to the local data server 8 of stress strain and temperature measurement data management, and the local data server 8 serves as the database of the BOTDR stress strain tester 6 and the DTS distributed temperature tester 7, and records the stress strain data and temperature collected. Data, the local data server 8 includes a database and a stress-strain calculation module 17. The local data server 8, BOTDR stress and strain tester 6 and DTS distributed temperature tester 7 are installed in the communication room of the substation and monitoring station to complete the sending and receiving of optical fiber sensing signals, and the processing and storage of local data; as user terminals remote database, and parse out the events on the sensing fiber through complex processing. The terminal joint box 4 is connected to the stress and strain tester 6 and the distributed temperature tester 7 respectively through the ADSS optical cable 5 . There are two ways of laying the ADSS optical cable 5: hanger in the air and buried in the cable trench. The OPPC optical cable I1 and the OPPC optical cable II2 are connected through the OPPC intermediate joint box 3 , and the OPPC optical cable II2 is connected to the OPPC terminal joint box 4 and then connected to the ADSS optical cable 5 . the

2. User terminal

The user monitoring terminal completes the graphic display of the data and the display of the GPS geographic information position. The main view of the user interface is the OPPC optical cable layout or wiring diagram, which displays the distribution temperature of the cable and a visual display view, and displays the temperature distribution curve on the line and the temperature change curve of each point with time in real time. It can analyze the measured OPPC temperature data, that is, calculate the conductor surface operating temperature according to the OPPC fiber temperature and other related data. The temperature measurement part can set the alarm threshold, and the alarm data can be set in the software. Each area should be able to set at least two alarm types: the highest temperature alarm, the temperature rise rate alarm, and the alarm for fiber damage and device abnormality. Zones should be able to alarm independently. When an alarm signal occurs, it can switch to the alarm screen and the distribution map of the area where the fault signal is located, and display the highest temperature in the fault area or other related alarm indicators. In addition to the basic requirements of the main control computer (including the monitor of the cable terminal monitoring station) on the screen, sound effects and sending alarm short messages, the alarm mode also provides an alarm output that meets industrial standards. the

3. Optical cable splice box

The optical cable splice box completes the separation of the OPPC optoelectronic part and the connection of the optical fiber channel. The types of optical cable splice boxes are divided into intermediate splice boxes and terminal splice boxes. the

The intermediate splice box is placed on the tension tower in the middle of the line to complete the optical fiber connection of the two strain-resistant lines. The construction method is usually hoisted in the implementation of the project. The terminal splice box is the starting point of the optical cable at the beginning or end of the line, and a column-type insulator splice box is mostly used to connect the optical fiber cable in the OPPC to the lead ADSS cable through the built-in ADSS optical cable. the

This technology lays the foundation for the realization of business functions such as the dynamic monitoring of distributed stress and strain and line temperature of overhead transmission lines, real-time alarm of abnormal stress and stretching of transmission lines, assessment of the health status of transmission lines, and dynamic increase of transmission capacity of transmission lines. the

4. OPPC optical cable for strain and temperature measurement

As shown in Figure 2 and Figure 3, Figure 2 and Figure 3 are the OPPC optical cable diagram with integrated temperature and strain sensing functions and the OPPC schematic diagram of temperature measurement and strain sensing;

The OPPC optical cable with integrated temperature measurement and stress monitoring functions mainly includes three components: one or more optical units; one or more layers of steel core (aluminum-clad steel or galvanized steel); one or more layers of aluminum wire ( aluminum alloy). The optical unit is composed of multiple optical fibers and protective tubes; the protective tube can be made of metal and/or non-metallic materials, which can form the load-bearing part of OPPC, and the metal protective material can also form the part of OPPC that transmits current. The optical unit can accommodate the optical fiber and protect the optical fiber from damage caused by environmental changes, external force, long-term and short-term thermal effects, moisture, etc. The optical unit can contain metal pipes, plastic pipes, grooved skeletons or suitable water-blocking materials as protective structures, and steel pipes are used for optical fiber protection in OPPC for temperature measurement. The optical fiber is housed and protected in a stainless steel loose tube, and the tube is filled with special ointment to play the role of waterproof, moisture-proof or other harmful gases, and heat insulation. the

The entire OPPC section contains materials with different conductivity properties, which is the key to affecting the transient performance of OPPC temperature measurement. The OPPC optical cable with integrated temperature measurement optical fiber can be applied at different voltage levels from 10kV to 500kV. High-voltage overhead lines (220kV and above) generally use multiple separate wires for single-phase, which brings about the performance matching problem of OPPC and its non-OPPC. In order to maintain With the same ampacity and three-phase electrical balance, it is necessary to ensure that the diameter, tensile strength, weight, and DC resistance of the OPPC and the matching wire are similar as much as possible. the

The temperature measuring fiber in the OPPC optical unit bundle tube can choose 50/125 or 62.5/125μM multimode fiber. The loss coefficient and scattering coefficient of the multimode optical fiber are higher, which increases the intensity of scattered light, thereby increasing the received signal strength of the photodetector and enhancing the signal-to-noise ratio. The sensing fiber for stress detection uses international standard single-mode fiber. BOTDR distinguishes the magnitude of stress and strain according to the frequency shift of the test signal. The sensitivity of the algorithm is very high. Therefore, BOTDR uses single-mode fiber, and the detection distance range is also large. , up to 100KM. the

On-line stress and strain monitoring of optical fiber composite phase line (OPPC) is based on BOTDR technology to monitor the stress and strain state of overhead transmission lines based on the deformation of the optical cable, the value of the excess length of the optical fiber, and the strain effect of the optical fiber caused by the deformation of the optical cable. Direct measurement through BOTDR The optical fiber strain value and the rated value of the optical fiber excess length can evaluate the strain degree of the line under force. Based on the BOTDR measurement line strain scheme, the health status of the monitored overhead line can be evaluated, and data and decision-making basis can be provided for the wind pressure fluctuation, temperature sag, and ice coating of the transmission line, as well as the dynamic capacity increase of the transmission line. the

5. Optical fiber sensing device

The BOTDR stress-strain tester 6 is a distributed Brillouin sensor for distributed measurement of the deformation information of optical fibers by external forces, and the DTS distributed temperature tester 7 is a distributed Raman temperature sensor for distributed measurement of optical fiber temperature information. the

The tester based on optical fiber sensing mainly includes laser, optical wavelength division multiplexing, photoelectric conversion circuit, trigger circuit, control chip, analog signal processing, analog-to-digital conversion and communication interface. The temperature tester can evaluate the two-way attenuation, optimize and adjust the parameters of the laser emission source, and improve the temperature accuracy of the measurement according to the number of connection points of the optical cable section and the optical performance transmission parameters of the splice box, the incoming optical cable and the temperature measurement optical cable, considering the influence of system dispersion. and distance positioning accuracy. the

6. Separate solution and calculation of temperature and strain data

As shown in Figure 1, Figure 1 is the fusion optical fiber composite phase line temperature and strain on-line monitoring device diagram, the local data server 8 includes the stress-strain calculation module 17 of the calculation module for calculating the strain data of the optical fiber, measured by the distributed Brillouin sensor In the stress and strain information obtained, the temperature information measured by the distributed Raman sensor is eliminated, and the accurate strain on the optical fiber is calculated. the

As shown in Figure 4, Figure 4 is a diagram of the temperature elimination algorithm for Brillouin measurement data; the specific implementation is as follows, the temperature and strain are measured simultaneously by combining spontaneous Raman scattering and spontaneous Brillouin scattering, and using spontaneous Raman scattering only for temperature Sensitive and insensitive to strain, the temperature information on the optical fiber is measured by a distributed Raman temperature sensor. After obtaining the temperature information of the optical fiber, the distributed Brillouin sensor is used to measure the Brillouin temperature and strain information. frequency shift, and then remove the magnitude of the temperature from the Brillouin frequency shift to calculate the strain information on the fiber. the

The sensitivity of Raman anti-Stokes signal intensity to temperature is about 0.8%/℃, and the sensitivity of Brillouin anti-Stokes signal intensity to temperature is about 0.3%/℃, so Raman is more sensitive to temperature than Brillouin signal Changes are more sensitive. In addition to the Raman scattering signal, the Rayleigh scattering signal is also a very important scattering signal in the reflected light. Distributed Raman temperature sensors usually use a second light source to measure the light intensity of the Rayleigh signal, and compare the Rayleigh light intensity with another The light intensity of the Raman signal measured by a light source is normalized to eliminate the influence of fiber loss, microbending and joint loss on system performance. The relationship between the change of normalized Raman light intensity and the temperature change can be expressed as:

$\mathrm{<span\; class="notranslate">\; \&Delta;</span>}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; \&Delta;</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; R</span>}}^{\mathrm{<span\; class="notranslate">\; T</span>}}$

In the formula, L is the length of the sensing fiber; ΔT _R (top) is the change of temperature at position L; ΔI _R (upper) ΔIR(L) is the change of normalized Raman light intensity at position L; is the temperature coefficient of Raman intensity.

The change of Brillouin frequency shift contains temperature and strain information, and the calculated temperature influence can be deducted from the measurement results of Brillouin frequency shift, and the change of strain at the fiber position L can be obtained as:

$\mathrm{<span\; class="notranslate">\; \&Delta;\&epsiv;</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;</span>}{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; Bv</span>}}^{\mathrm{<span\; class="notranslate">\; T</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&Delta;</span>}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; Bv</span>}}^{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}}$

是布里渊频移的温度系数；

是布里渊频移的应变系数。布里渊频移的系数

为1.07MHz/℃，

为0.05MHz/μ。  In the formula, Δv _B (L) is the change of Brillouin frequency shift at L;

is the temperature coefficient of the Brillouin frequency shift;

is the gauge factor for the Brillouin frequency shift. Coefficient of Brillouin frequency shift

1.07MHz/℃,

0.05MHz/μ.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application rather than to limit its protection scope. Although the present application has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: After reading this application, those skilled in the art can still make various changes, modifications or equivalent replacements to the specific implementation methods of the application. These changes, modifications or equivalent replacements are all within the protection scope of the pending claims of the application. the

Claims (6)

1. temperature and strain on-Line Monitor Device that merges OPPC, described device comprises DATA REASONING and management platform, supervisory control comuter, OPPC optical cable and connector box thereof, it is characterized in that: two OPPC optical cables that described OPPC optical cable is connected for the intermediate joint box by described connector box, the other end of one of them described OPPC optical cable is connected with the no-go sub box of described connector box;

The described no-go sub box other end is connected with the distributed temperature tester with the stress-strain test instrument of management platform with described DATA REASONING respectively by the ADSS cable, and the other end of described stress-strain test instrument and described distributed temperature tester is connected with the local data server of management platform with described DATA REASONING respectively; The other end of described local data server is connected with described supervisory control comuter.

2. a kind of temperature and strain on-Line Monitor Device that merges OPPC as claimed in claim 1 is characterized in that: described OPPC optical cable is the OPPC optical cable with temperature and ess-strain perception simultaneously that comprises light unit, steel core and aluminum steel;

Described smooth unit comprises protection tube and the interior ointment of filling of protection tube of optical fiber, optical fiber;

Built-in multimode optical fiber and ess-strain monitoring excess fiber length series in described smooth unit;

Described steel core is aluminium Baogang or galvanized steel; Described aluminum steel is aluminium alloy.

3. a kind of temperature and strain on-Line Monitor Device that merges OPPC as claimed in claim 1, it is characterized in that: described stress-strain test instrument is the BOTDR fiber optic sensing device that distributed measurement optical fiber is subjected to external force generation deformation data; The distributed temperature tester is the DTS fiber optic sensing device of distributed measurement fiber optic temperature information.

4. a kind of temperature and strain on-Line Monitor Device that merges OPPC as claimed in claim 1 is characterized in that: described local data server is record from the stress-strain data collected described stress-strain test instrument and described distributed temperature tester and the server of temperature data.

5. a kind of temperature and strain on-Line Monitor Device that merges OPPC as claimed in claim 1 is characterized in that: the aerial hanger of described ADSS optical cable or wear and bury in cable duct.

6. a kind of temperature and strain on-Line Monitor Device that merges OPPC as claimed in claim 1, described OPPC optical cable can be used for the voltage of 10kv to 500kv different brackets.

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