CN102840928A - Online temperature monitoring system and monitoring method for optical fiber composition phase conductor (OPPC) - Google Patents

Abstract

The invention relates to an online temperature monitoring system and monitoring method for optical fiber composite phase lines. The monitoring system includes an OPPC optical cable (1), an optical unit (2), an optical cable splice box (3), an incoming optical cable (4), a measuring The temperature host (5) and the monitoring computer (6); the OPPC optical cable (1), the optical unit (2), the optical cable splice box (3), the incoming optical cable (4) and the temperature measurement host (5) are connected in sequence; the The monitoring computer (6) is connected with the temperature measuring host (5). The technical scheme provided by the invention is used for real-time partition monitoring of the temperature of the OPPC optical cable in operation, and provides accurate temperature data for applications such as transmission line failure early warning and dynamic capacity increase.

Description

An online temperature monitoring system and monitoring method for optical fiber composite phase line

technical field

The invention relates to a monitoring system and a monitoring method thereof, in particular to an online temperature monitoring system and a monitoring method thereof for optical fiber composite phase lines.

Background technique

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.

Optical Fiber Composite Phase Line (OPPC) is a new type of special optical cable embedded with optical fiber units in the traditional phase line structure. It makes full use of the line resources of the power system itself and has dual functions of power transmission and communication services. In my country's current power grid, the transmission line current is generally transmitted by a three-phase power system, and OPPC is used to replace one of the three phases to form a three-phase power system composed of two wires and one OPPC, without additional erection Communication lines can solve the automation, scheduling, protection and other problems of the power grid. Therefore, OPPC technology provides another power communication solution. OPPC optical cable makes full use of the unique resources of the power system (transmission lines, pole towers, etc.), and is closely integrated with the power grid structure for construction. The construction speed is fast and the construction period is short. The use of OPPC optical cable can optimize the design of transmission lines and make full use of transmission line resources. It avoids conflicts with the outside world in terms of frequency resources, routing coordination, electromagnetic compatibility, short circuits, lightning strikes, etc.; the construction of OPPC optical cables will not add additional burdens to transmission lines, reducing the possibility of man-made damage. In addition, because OPPC is made of a good conductor material with a large cross-section, the short-circuit current it can withstand is larger than that of OPGW optical cable; at the same time, OPPC is not necessarily installed at the top of the tower, so it is not easy to be struck by lightning, and it avoids broken cores caused by lightning strikes like OPGW. Broken stock accident. There is no overhead ground wire for urban and rural power grids with a voltage level of 110kV and below, and the conventional distance from the overhead wire to the ground has been selected according to the design. In the past, it was impossible to consider the requirements of optical fiber communication during construction. Now when ADSS is erected, the safety distance to the ground is not enough, and the distance to the hanging point is too high. Only OPPC is the most suitable choice. For high-voltage transmission lines, OPPC still has the space and possibility of application, and there are already application examples abroad.

At present, the temperature online monitoring of high-voltage cables, including cables and overhead wires, is usually scattered 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. According to the requirements of online monitoring of transmission line status and OPPC application, combined with the principle of Raman scattering distributed optical fiber sensing technology, the patent of the present invention designs a method and system for online temperature monitoring of optical fiber composite phase line (OPPC). The invention combines OPPC and transmission line state monitoring application requirements to realize three functions of power transmission, temperature measurement and communication. Improve the intelligence of the power transmission system.

Related Chinese patent ZL200920289025.2 is a stress and strain measurement device applied to optical fiber composite phase line OPPC, which is composed of distributed optical fiber system BOTDR based on Brillouin scattering, monitoring computer, conductive optical fiber and its splice box, and optical fiber composite phase line OPPC , can complete the monitoring of OPPC stress and strain abnormal points; the related Chinese patent ZL200910175452 distributed optical fiber temperature measurement system, the invention includes a single-chip microcomputer control board, an optical fiber temperature field information acquisition module, a photoelectric detector and a circuit signal post-processing module, which can complete temperature measurement Optical cable temperature monitoring cannot realize OPPC temperature monitoring. Chinese patent ZL201110007053.2 is based on the distributed optical fiber temperature measurement method and system for cable ampacity monitoring. The temperature measurement optical fiber directly contacts the surface of the cable, and the measurement method used cannot be used for OPPC temperature monitoring. US patent US7412117 (PCT/GB2004/004383) Apparatus and method for distributed temperature sensing does not consider the complex heat conduction characteristics of OPPC lines, and does not consider the special performance of multi-point connection of overhead optical cables.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides an online temperature monitoring system and its monitoring method for optical fiber composite phase lines. Applications such as scaling up provide accurate temperature data.

The object of the present invention is to adopt following technical scheme to realize:

An online temperature monitoring system for optical fiber composite phase line, the improvement is that the monitoring system includes OPPC optical cable 1, optical unit 2, optical cable splice box 3, incoming optical cable 4, temperature measurement host 5 and monitoring computer 6 The OPPC optical cable 1, the optical unit 2, the optical cable splice box 3, the lead-in optical cable 4 and the temperature measurement host 5 are sequentially connected; the monitoring computer 6 is connected with the temperature measurement host 5;

The monitoring system is respectively connected with the carrying capacity evaluation system and the transmission line state monitoring system.

Wherein, the OPPC optical cable 1 includes at least one layer of steel core 11, at least one optical unit 12 and at least one layer of aluminum wire 13; the at least one layer of steel core 11 and at least one optical unit 12 form the central strengthening core of the OPPC optical cable; The at least one layer of aluminum wires 13 is uniformly arranged on the outer layer of the central reinforcing core.

Wherein, the steel core 11 is made of aluminum-clad steel wire or galvanized steel wire; the light unit 12 is a stainless steel tube light unit; and the aluminum wire 13 is aluminum alloy.

Wherein, the optical unit 2 and the optical unit 12 include optical fibers and protective materials; the optical fibers include temperature-measuring optical fibers and communication optical fibers; the temperature-measuring optical fibers and communication optical fibers are filled and fixed in steel pipes with water-blocking material ointment; the temperature-measuring optical fibers The optical fiber adopts multi-mode 62.5/125 or 50/125 micron optical fiber; the protective material adopts metal or non-metal.

Among them, the OPPC optical cable 1 with integrated temperature measuring optical fiber is applied at different voltage levels from 10kV to 500kV.

Wherein, the temperature measuring optical fiber of the OPPC optical cable 1 is connected with the temperature measuring optical fiber of the optical unit 2; the temperature measuring optical fiber of the optical unit 2 is connected with the optical cable splice box 3.

Wherein, the optical cable splice box 3 is used to complete the optoelectronic separation of the OPPC optical cable, and connect the temperature measuring optical fiber of the OPPC optical cable 1 and the temperature measuring optical fiber of the optical unit 2 with the incoming optical cable 4 .

Wherein, the introduction optical cable 4 adopts an optical fiber with an attenuation of 3db/km, and the transmission of the introduction optical cable 4 matches the laser source emitted by the laser in the temperature measurement host 5 .

Wherein, the temperature measuring host 5 includes a laser 51, a light source amplifier 52, a wavelength division multiplexer 53, a logic trigger circuit 54, a control chip 55, a photoelectric converter 56, an analog-to-digital conversion circuit 57, an analog signal processor 58 and a communication interface 59;

The light source signal of the laser 51 is transmitted to the analog signal processor 58 through the light source amplifier 52, the wavelength division multiplexer 53 and the photoelectric converter 56;

The analog signal processor 58 passes the signal processing to the analog-to-digital conversion circuit 57;

The control chip 55 communicates with the light source amplifier 52, the logic trigger circuit 54 and the analog signal processor 58 respectively;

The logic trigger circuit 54 communicates with the laser 51 and the analog-to-digital converter 57 respectively;

The communication interface 59 communicates with the control chip 55 .

Wherein, the laser 51 emits a laser source, and the laser source adopts a long-wave design; the laser 51 includes a driving circuit; the driving circuit is used to reduce noise and increase driving power.

Wherein, the light source amplifier 52 is an erbium-doped fiber amplifier; the wavelength division multiplexer 53 completes incident light emission and reflected light reception.

Wherein, the logic trigger circuit 54 provides a modulation signal to the laser, and the modulation signal adopts an electric pulse sequence with a width of more than 10 ns; the control chip 55 includes a memory.

Wherein, the photoelectric converter 56 adopts an avalanche diode to realize the conversion of reflected light into a current signal; the reflected light includes Stokes light and square Stokes light;

The analog signal processor 58 completes the conversion from the current signal to the voltage signal, and amplifies the voltage signal; the analog-to-digital conversion circuit 57 adopts an analog-to-digital conversion chip, and the analog-to-digital conversion chip and the control chip are connected by a parallel interface.

Wherein, the communication interface 59 adopts Ethernet or serial port communication; the sensing data signal is input in real time through the communication interface and stored in the memory of the control chip; the sensing data signal includes ambient temperature, sunlight intensity and wind speed signal.

Wherein, the monitoring computer 6 is used to complete data storage and statistical analysis, and provide data to the ampacity evaluation system and the transmission line status monitoring system.

The present invention provides an online temperature monitoring method for optical fiber composite phase line based on another purpose. The improvement is that the method includes the following steps:

A. Collect the temperature of the temperature-measuring optical fiber at each distance point of the optical unit 12 or the optical unit 2;

B, the temperature measurement optical fiber temperature of the step A and the current value data mapping of the monitoring computer 6;

C. Judging the logical relationship between the current value and the temperature of the temperature-measuring optical fiber;

D, import described OPPC optical cable heat transfer model;

E. Correct the temperature of OPPC optical cable;

F. Store data and generate OPPC optical cable temperature monitoring basic database.

Wherein, in the step A, the range of each distance point is between 0.5m-1m; the measurement time of the temperature measurement host 5 temperature measurement channel is 40s; the coordinate value of the temperature measurement optical fiber temperature corresponding to each distance point is Real-time data that is constantly refreshed in 40 seconds:

(X ₁ ,T ₁ ), (X ₂ ,T ₂ ), (X ₃ ,T ₃ )...(X _n ,T _n );

Among them: X represents the distance; T represents the temperature; X ₁ is the distance of the first distance point; T ₁ gets the corresponding temperature measurement fiber temperature of the first distance point; X ₂ is the distance of the second distance point; T ₂ Get the corresponding temperature measuring fiber temperature of the second distance point; X ₃ is the distance of the third distance point; T ₃ gets the corresponding temperature measuring fiber temperature of the third distance point; X _n is the temperature of the nth distance point distance; T _n gets the temperature of the temperature measuring fiber corresponding to the nth distance point; n is the total measurement distance and is rounded to the multiple of the distance resolution.

Wherein, in the step B, input the current value data of the monitoring computer 6 to obtain the temperature measuring optical fiber temperature, the actual current value and the coordinate value of the distance point:

(X ₁ , T ₁ , I ₁ ), (X ₂ , T ₂ , I ₂ ), (X ₃ , T ₃ , I ₃ )...(X _n , T _n , I _n );

Among them: I ₁ represents the current value of the first distance point; I ₂ represents the current value of the second distance point; I ₃ represents the current value of the third distance point; I _n represents the current value of the nth distance point; The current value corresponds to the effective value of the actual current within 40 seconds in step A output by the monitoring computer 6 .

Wherein, in the step C, the logical relationship between the current value and the temperature of the temperature-measuring fiber is that the temperature of the temperature-measuring fiber increases or does not change when the current value increases; the heat conduction time is greater than the channel response time of 40s;

If it is not satisfied that the heat conduction time is greater than the channel reaction time of 40s, then judge the influence of ambient temperature t1, sunlight intensity q and wind speed v on the temperature of the temperature measuring optical fiber.

Wherein, in the step D, when the ambient temperature t1, the sunlight intensity q and the wind speed v are certain, the OPPC optical cable heat transfer model is: y=f(T);

Where: y represents the temperature of the OPPC optical cable; T represents the temperature of the temperature-measuring optical fiber in step A.

Wherein, in the step E, the temperature of the OPPC optical cable is corrected in combination with the actual current value, ambient temperature t1, sunshine intensity q and wind speed v.

Wherein, in the step F, the corrected OPPC cable temperature and distance points are stored in the database to form the OPPC cable temperature monitoring basic database: (X ₁ , y ₁ ), (X ₂ , y ₂ ), (X ₃ , y ₃ )...(X _n , y _n );

Stored together with the actual current value to form the basic database of OPPC optical cable dynamic capacity increase: (X ₁ , y ₁ , I ₁ ), (X ₂ , y ₂ , I ₂ ), (X ₃ , y ₃ , I ₃ )...( X _n , y _n , I _n );

The OPPC optical cable temperature monitoring basic database and the OPPC optical cable dynamic capacity increasing basic database are stored in the memory of the control chip 55 .

Compared with prior art, the beneficial effect that the present invention reaches is:

1. The temperature detection method for the optical fiber composite phase line provided by the present invention is based on the constant temperature model of the optical fiber composite phase line; the temperature accuracy of the obtained OPPC optical cable is high;

2. The temperature detection method for optical fiber composite phase line provided by the present invention, according to the measured distance, the temperature of the optical fiber, the actual current obtained, judge the logical relationship between the current value and the temperature of the temperature-measuring optical fiber, and push it to the ambient temperature, The influence of sunshine intensity and wind speed provides the basis;

3. The online temperature monitoring system for optical fiber composite phase line provided by the present invention realizes three functions of power transmission, communication and temperature measurement with one wire, and improves the comprehensive performance of OPPC optical cable application;

4. The online temperature monitoring method for optical fiber composite phase line provided by the present invention takes into account the influence of various factors such as ambient temperature, sunlight intensity, and wind speed on the temperature measuring optical fiber of OPPC optical cable, and effectively improves the performance of the sensor of the transmission line status monitoring system.

Description of drawings

Fig. 1 is a block diagram of an online temperature monitoring system for an optical fiber composite phase line provided by the present invention;

Fig. 2 is the schematic diagram of the OPPC optical cable 1 of the integrated temperature measuring optical fiber provided by the present invention;

Fig. 3 is a schematic diagram of the temperature measuring host 5 provided by the present invention;

Fig. 4 is a flow chart of the online temperature monitoring method for optical fiber composite phase line provided by the present invention.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

The block diagram of the online temperature monitoring system for optical fiber composite phase line provided by the present invention is shown in Figure 1, and the monitoring system includes OPPC optical cable 1, optical unit 2, optical cable splice box 3, incoming optical cable 4, temperature measurement host 5 and monitoring computer 6 ; OPPC optical cable 1, optical unit 2, optical cable splice box 3, lead-in optical cable 4 and temperature measurement host 5 are connected in sequence; monitoring computer 6 is connected with temperature measurement host 5.

The OPPC optical cable 1 of the integrated temperature measuring optical fiber provided by the present invention is shown in Figure 2, and the OPPC optical cable 1 comprises at least one layer of steel core 11, at least one optical unit 12 and at least one layer of aluminum wire 13; the at least one layer of steel core 11 And at least one optical unit 12 constitutes the central strengthening core of the OPPC optical cable; at least one layer of aluminum wire 13 is uniformly arranged on the outer layer of the central strengthening core.

The steel core 11 is made of aluminum clad steel wire or galvanized steel wire; the light unit 12 is a stainless steel tube light unit; the aluminum wire 13 is aluminum alloy. Optical unit 2 and optical unit 12 include optical fiber and protective material; optical fiber includes temperature measuring optical fiber and communication optical fiber; temperature measuring optical fiber and communication optical fiber are filled and fixed in steel pipe with water-blocking material ointment; temperature measuring optical fiber adopts multimode 62.5/125 or 50/ 125 micron optical fiber; the protective material is metal or non-metal. The entire OPPC optical cable section contains materials with different heat transfer properties, and the skin effect is the key to affecting the temperature measurement transient performance of the OPPC optical cable. The loss coefficient and scattering coefficient of the optical fiber are optimized to increase the intensity of scattered light. High-voltage overhead (220kV and above) lines generally use multiple separate wires for each phase, which brings about the performance matching problem of OPPC and its non-OPPC. In order to maintain the same current carrying capacity and three-phase electrical balance, it is necessary to ensure the OPPC and the matching wire as much as possible. Diameter, tensile strength, weight, DC resistance, etc. are similar.

The OPPC optical cable 1 with integrated temperature measuring optical fiber is applied at different voltage levels from 10kV to 500kV. The temperature measuring optical fiber of the OPPC optical cable 1 is connected to the temperature measuring optical fiber of the optical unit 2; the temperature measuring optical fiber of the optical unit 2 is connected to the optical cable splice box 3. The protective material of the optical unit can be metal or non-metallic. Non-metal can form the load-bearing part of the OPPC optical cable, and the metal protective material can also form the part of the OPPC optical cable that transmits current. The optical unit 2 can accommodate the optical fiber, and can protect the optical fiber from damage caused by environmental changes, external force, long-term and short-term thermal effects, moisture and the like. The optical unit 2 can include metal pipes, plastic pipes, grooved skeletons or suitable water-blocking materials as protective structures, and steel pipes are used as optical fiber protection in OPPC for temperature measurement.

The optical cable splice box 3 is used to complete the optoelectronic separation of the OPPC optical cable, and connect the temperature measuring optical fiber of the OPPC optical cable 1 and the temperature measuring optical fiber of the optical unit 2 with the incoming optical cable 4 . The optical cable splice box is the starting point of the temperature measuring distance of the temperature measuring host 5 .

The incoming optical cable 4 adopts an optical fiber with an attenuation of 3db/km, and the transmission of the incoming optical cable 4 matches the laser source emitted by the laser in the temperature measuring host 5 .

The principle of the temperature measuring host provided by the present invention is shown in Figure 3. The temperature measuring host 5 includes a laser 51, a light source amplifier 52, a wavelength division multiplexer 53, a logic trigger circuit 54, a control chip 55, a photoelectric converter 56, and an analog-to-digital converter. Circuit 57, analog signal processor 58, and communication interface 59; temperature measurement host 5 considers the dispersion of the online temperature monitoring system according to the number of connection points of optical cable sections, and the optical performance transmission parameters of optical cable splice box 3, incoming optical cable 4 and OPPC optical cable 1 Evaluate the influence of two-way attenuation, optimize and adjust the parameters of the laser emission source, and improve the temperature accuracy and distance positioning accuracy of the measurement. The temperature measurement host 5 independently designs a logic trigger circuit to effectively ensure the synchronization of the analog-to-digital conversion and the pulse emission of the laser source.

The light source signal of the laser 51 is passed to the analog signal processor 58 through the light source amplifier 52, the wavelength division multiplexer 53 and the photoelectric converter 56; Communicate with light source amplifier 52, logic trigger circuit 54 and analog signal processor 58; logic trigger circuit 54 communicates with laser 51 and analog-to-digital converter 57 respectively; communication interface 59 communicates with control chip 55.

The laser 51 emits a laser source, the laser source adopts a long-wave design, and the optical amplifier can be automatically adjusted according to the scattered light parameters fed back by the control chip; the laser 51 includes a driving circuit; the driving circuit is used to reduce noise and increase driving power.

The light source amplifier 52 is an erbium-doped fiber amplifier; the wavelength division multiplexer 53 completes incident light emission and reflected light reception. The function of the wavelength division multiplexer 53 is to couple the signal light into the optical fiber, filter out the Rayleigh scattering, Brillouin scattering and end-face noise in the scattered light, and distinguish the Stokes light from the anti-Stokes light On, the backscattered light in the optical fiber is divided into two paths after wavelength division multiplexing, Stokes light and anti-Stokes light, and the wavelength division multiplexer 53 is to use a combination of filters with different properties to To achieve the purpose of filtering out the Raman spectrum, a layer of transparent dielectric film with uniform refractive index and thickness is coated on the smooth surface of the glass to achieve anti-reflection or anti-reflection effects for different wavelengths.

The logic trigger circuit 54 realizes the synchronization of laser emission and analog-to-digital conversion, and provides a modulation signal to the laser. The modulation signal adopts an electric pulse sequence with a width of more than 10 ns; the control chip 55 completes the coordinated control between several key modules. For fusion calculation of sensing information, the control chip 55 includes a memory for storing sensing data signals transmitted by the communication interface 59 in real time.

The photoelectric converter 56 adopts an avalanche diode to realize the conversion of reflected light to a current signal; the reflected light includes Stokes light and square Stokes light; the analog signal processor 58 completes the conversion of the current signal to a voltage signal, And the voltage signal is amplified; the analog-to-digital conversion circuit 57 adopts an analog-to-digital conversion chip, and the analog-to-digital conversion chip and the control chip are connected by a parallel interface. Improve the response speed of sampling.

The communication interface 59 adopts Ethernet or serial port communication; the sensing data signal is input in real time through the communication interface and stored in the memory of the control chip; and the multi-sensing information fusion processing is completed. Sensing data signals include ambient temperature, sunlight intensity and wind speed signals.

The monitoring computer 6 is used to complete data storage and statistical analysis, and provide data to the current carrying capacity evaluation system and the transmission line status monitoring system. The online temperature monitoring system is respectively connected with the current carrying capacity evaluation system and the transmission line state monitoring system.

The process flow of the online temperature monitoring method for optical fiber composite phase line provided by the present invention is shown in Figure 4, and the method includes the following steps:

A. Collect the temperature of the temperature measuring optical fiber at each distance point of the optical unit 12 or optical unit 2:

The range of each distance point is between 0.5m-1m; the measurement time of the temperature measurement host 5 temperature measurement channel is 40s; the real-time data of the temperature measurement optical fiber temperature corresponding to the coordinate value of each distance point is continuously refreshed in 40 seconds: (X ₁ , T ₁ ), (X ₂ , T ₂ ), (X ₃ , T ₃ )...(X _n , T _n )

Among them: X represents the distance; T represents the temperature; X ₁ is the distance of the first distance point; T ₁ gets the corresponding temperature measurement fiber temperature of the first distance point; X ₂ is the distance of the second distance point; T ₂ Get the corresponding temperature measuring fiber temperature of the second distance point; X ₃ is the distance of the third distance point; T ₃ gets the corresponding temperature measuring fiber temperature of the third distance point; X _n is the temperature of the nth distance point distance; T _n gets the temperature of the temperature measuring fiber corresponding to the nth distance point; n is the total measurement distance and is rounded to the multiple of the distance resolution.

B, the temperature measurement optical fiber temperature of described step A and the electric current value data mapping of described monitoring computer 6:

Input the actual current value I to get real-time data including distance points, temperature measurement fiber temperature, and actual current value: (X ₁ , T ₁ , I ₁ ), (X ₂ , T ₂ , I ₂ ), (X ₃ ,T ₃ , I ₃ )...(X _n , T _n , _In ), the calculation method of the current value in step B can be obtained according to the current sensor data of the existing key nodes in the power system according to Kirchhoff's current law.

I ₁ represents the current value of the first distance point; I ₂ represents the current value of the second distance point; I ₃ represents the current value of the third distance point; I _n represents the current value of the nth distance point; The current value corresponds to the effective value of the actual current within 40 seconds in step A output by the monitoring computer 6 .

C. Judging the logical relationship between the current value and the temperature of the temperature-measuring optical fiber:

The logical relationship between the current value and the temperature of the temperature-measuring optical fiber is that the temperature of the temperature-measuring optical fiber increases or remains unchanged when the current value increases; the heat conduction time is greater than the channel response time of 40s; if the heat conduction time is greater than the channel response time of 40s, the ambient temperature is judged The influence of t1, sunshine intensity q and wind speed v on the temperature of the temperature measuring optical fiber.

D, import the OPPC optical cable heat transfer model:

When the ambient temperature t1, sunlight intensity q and wind speed v are constant, the OPPC cable heat transfer model is: y=f(T);

Among them: y represents the temperature of the OPPC optical cable; T represents the temperature of the temperature-measuring optical fiber in step A.

E. Correct the OPPC cable temperature:

Correct the temperature of OPPC optical cable 1. In step D, the temperature of OPPC optical cable is deduced according to the pre-assumed external conditions. The pre-assumed external conditions include actual current, ambient temperature, customs, and sunshine intensity; logical reasoning given to step C is required Correct the actual wire temperature y. Combined with the import of additional sensing information, including data from some on-site transmission line monitoring sensors (mainly including ambient temperature, customs, and sunshine intensity), as well as weather forecast data from various sources.

F. Store data and generate OPPC optical cable temperature monitoring basic database:

The corrected OPPC cable 1 temperature and distance points are stored in the database to form the OPPC cable 1 temperature monitoring basic database: (X ₁ , y ₁ ), (X ₂ , y ₂ ), (X ₃ , y ₃ )...(X _n ,y _n );

Stored together with the actual current value to form the basic database of OPPC optical cable dynamic capacity increase: (X ₁ , y ₁ , I ₁ ), (X ₂ , y ₂ , I ₂ ), (X ₃ , y ₃ , I ₃ )...( X _n , y _n , I _n );

The OPPC optical cable 1 temperature monitoring basic database and the OPPC optical cable dynamic capacity increasing basic database are stored in the memory of the control chip 55 .

The on-line temperature monitoring system and monitoring method for optical fiber composite phase line provided by the present invention can realize three functions of power transmission, communication and temperature measurement by one wire, and improve the comprehensive performance of OPPC optical cable application; considering ambient temperature and sunlight intensity The impact of various factors such as wind speed on the temperature measurement optical fiber of OPPC optical cable can effectively improve the performance of the sensor of the transmission line status monitoring system.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims (22)

1. An online temperature monitoring system for optical fiber composite phase line, characterized in that the monitoring system includes OPPC optical cable (1), optical unit (2), optical cable splice box (3), lead-in optical cable (4), The temperature measurement host (5) and the monitoring computer (6); the OPPC optical cable (1), the optical unit (2), the optical cable splice box (3), the incoming optical cable (4) and the temperature measurement host (5) are connected in sequence; The monitoring computer (6) is connected with the temperature measuring host (5); The monitoring system is respectively connected with the carrying capacity evaluation system and the transmission line state monitoring system. 2. The online temperature monitoring system according to claim 1, characterized in that, the OPPC optical cable (1) comprises at least one layer of steel core (11), at least one optical unit (12) and at least one layer of aluminum wire (13 ); the at least one layer of steel core (11) and at least one optical unit (12) constitute the central strengthening core of the OPPC optical cable; the at least one layer of aluminum wire (13) is evenly arranged on the outer layer of the central strengthening core. 3. The online temperature monitoring system according to claim 2, characterized in that, the steel core (11) is made of aluminum clad steel wire or galvanized steel wire; the light unit (12) is a stainless steel tube light unit; the Above-mentioned aluminum wire (13) or be aluminum alloy. 4. The online temperature monitoring system according to claim 1, characterized in that, the optical unit (2) and the optical unit (12) include optical fibers and protective materials; the optical fibers include temperature measuring optical fibers and communication optical fibers; the measuring The temperature optical fiber and the communication optical fiber are filled and fixed in the steel pipe with a water-blocking material ointment; the temperature measuring optical fiber is a multimode 62.5/125 or 50/125 micron optical fiber; the protective material is metal or non-metallic. 5. The online temperature monitoring system according to any one of claims 2-3, characterized in that the OPPC optical cable (1) with integrated temperature measuring optical fiber is applied at different voltage levels of 10kV-500kV. 6. The online temperature monitoring system according to claim 1, characterized in that, the temperature measuring optical fiber of the OPPC optical cable (1) is connected to the temperature measuring optical fiber of the optical unit (2); the measuring optical fiber of the optical unit (2) The warm optical fiber is connected to the optical cable splice box (3). 7. The online temperature monitoring system according to claim 1, characterized in that, the optical cable splice box (3) is used to complete the photoelectric separation of the OPPC optical cable, and connect the temperature measuring optical fiber and the optical unit of the OPPC optical cable (1) The temperature measuring optical fiber of (2) is docked with the lead-in optical cable (4). 8. The online temperature monitoring system according to claim 1, characterized in that, the incoming optical cable (4) adopts an optical fiber with an attenuation of 3db/km, and the incoming optical cable (4) is transmitted to the temperature measuring host (5) The laser source matched to the laser emitter. 9. The online temperature monitoring system according to claim 1 or 8, characterized in that, the temperature measuring host (5) includes a laser (51), a light source amplifier (52), a wavelength division multiplexer (53), a logic Trigger circuit (54), control chip (55), photoelectric converter (56), analog-to-digital conversion circuit (57), analog signal processor (58) and communication interface (59); The light source signal of the laser (51) is transmitted to an analog signal processor (58) through a light source amplifier (52), a wavelength division multiplexer (53) and a photoelectric converter (56); The analog signal processor (58) transmits the signal to the analog-to-digital conversion circuit (57) after processing; The control chip (55) communicates with the light source amplifier (52), logic trigger circuit (54) and analog signal processor (58) respectively; The logic trigger circuit (54) communicates with the laser (51) and the analog-to-digital converter (57) respectively; The communication interface (59) communicates with the control chip (55). 10. The online temperature monitoring system according to claim 9, characterized in that, the laser (51) emits a laser source, and the laser source adopts a long-wave design; the laser (51) includes a driving circuit; the driving Circuits are used to reduce noise and increase drive power. 11. The online temperature monitoring system according to claim 9, characterized in that, the light source amplifier (52) is an erbium-doped fiber amplifier; the wavelength division multiplexer (53) completes incident light emission and reflected light reception. 12. The online temperature monitoring system according to claim 9, characterized in that, the logic trigger circuit (54) provides a modulation signal to the laser, and the modulation signal adopts an electric pulse sequence with a width of more than 10 ns; the control chip (55) including memory. 13. The online temperature monitoring system according to claim 9, characterized in that, the photoelectric converter (56) uses an avalanche diode to realize the conversion of reflected light into a current signal; the reflected light includes Stokes Light and Fang Stokes Light; The analog signal processor (58) completes the conversion from the current signal to the voltage signal, and amplifies the voltage signal; the analog-to-digital conversion circuit (57) adopts an analog-to-digital conversion chip, and the analog-to-digital conversion chip and the control chip adopt Parallel interface connection. 14. The online temperature monitoring system according to claim 9, characterized in that, the communication interface (59) adopts Ethernet or serial port communication; the sensing data signal is input in real time through the communication interface and stored in the control In the memory of the chip; the sensing data signals include ambient temperature, sunlight intensity and wind speed signals. 15. The online temperature monitoring system according to claim 1, characterized in that the monitoring computer (6) is used to complete data storage and statistical analysis, and provide data to the ampacity evaluation system and the transmission line status monitoring system . 16. An online temperature monitoring method for an optical fiber composite phase line, characterized in that the method comprises the following steps: A. Collect the temperature of the optical fiber for temperature measurement at each distance point of the optical unit (12) or optical unit (2); B. The temperature of the temperature measuring optical fiber in the step A and the current value data mapping of the monitoring computer (6); C. Judging the logical relationship between the current value and the temperature of the temperature-measuring optical fiber; D, import described OPPC optical cable heat transfer model; E. Correct the temperature of OPPC optical cable; F. Store data and generate OPPC optical cable temperature monitoring basic database. 17. The online temperature monitoring method according to claim 16, characterized in that, in the step A, the range of each distance point is between 0.5m-1m; the measurement of the temperature measurement channel of the temperature measurement host (5) The time is 40s; the temperature of the temperature measuring optical fiber corresponds to the real-time data of the coordinate values of each distance point that is continuously refreshed in 40 seconds: (X ₁ ,T ₁ ), (X ₂ ,T ₂ ), (X ₃ ,T ₃ )...(X _n ,T _n ); Among them: X represents the distance; T represents the temperature; X ₁ is the distance of the first distance point; T ₁ gets the corresponding temperature measurement fiber temperature of the first distance point; X ₂ is the distance of the second distance point; T ₂ Get the corresponding temperature measuring fiber temperature of the second distance point; X ₃ is the distance of the third distance point; T ₃ gets the corresponding temperature measuring fiber temperature of the third distance point; X _n is the temperature of the nth distance point distance; T _n gets the temperature of the temperature measuring fiber corresponding to the nth distance point; n is the total measurement distance and is rounded to the multiple of the distance resolution. 18. The online temperature monitoring method according to claim 16, characterized in that, in the step B, the current value data of the monitoring computer (6) is input to obtain the temperature of the temperature measuring optical fiber, the actual current value and the distance point Coordinate value: (X ₁ , T ₁ , I ₁ ), (X ₂ , T ₂ , I ₂ ), (X ₃ , T ₃ , I ₃ )...(X _n , T _n , I _n ); Among them: I ₁ represents the current value of the first distance point; I ₂ represents the current value of the second distance point; I ₃ represents the current value of the third distance point; I _n represents the current value of the nth distance point; The current value corresponds to the effective value of the actual current within 40 seconds in step A output by the monitoring computer (6). 19. The online temperature monitoring method according to claim 16, characterized in that, in the step C, the logical relationship between the current value and the temperature of the temperature-measuring fiber is that the temperature of the temperature-measuring fiber increases or remains unchanged when the current value increases ;The heat conduction time is 40s longer than the channel reaction time; If it is not satisfied that the heat conduction time is greater than the channel reaction time of 40s, then judge the influence of ambient temperature t1, sunlight intensity q and wind speed v on the temperature of the temperature measuring optical fiber. 20. online temperature monitoring method as claimed in claim 16, is characterized in that, in described step D, described OPPC optical cable heat transfer model is: y=f( T); Where: y represents the temperature of the OPPC optical cable; T represents the temperature of the temperature-measuring optical fiber in step A. 21. The online temperature monitoring method according to claim 16, characterized in that, in the step E, the OPPC cable temperature is corrected in conjunction with actual current value, ambient temperature t1, sunlight intensity q and wind speed v. 22. online temperature monitoring method as claimed in claim 16, is characterized in that, in described step F, the OPPC optical cable temperature of correction and distance point are stored in the database, form OPPC optical cable temperature monitoring basic database: (X ₁ , y ₁ ), (X ₂ , y ₂ ), (X ₃ , y ₃ )...(X _n , y _n ); Stored together with the actual current value to form the basic database of OPPC optical cable dynamic capacity increase: (X ₁ , y ₁ , I ₁ ), (X ₂ , y ₂ , I ₂ ), (X ₃ , y ₃ , I ₃ )...( X _n , y _n , I _n ); The OPPC optical cable temperature monitoring basic database and the OPPC optical cable dynamic capacity increasing basic database are stored in the memory of the control chip (55).

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