阅读说明：本技术 一种高压输电线路无线测温系统分布式光纤通信方法 (Distributed optical fiber communication method for wireless temperature measurement system of high-voltage transmission line ) 是由 时峰 毛家旺 袁齐坤 湛留洋 陈宣林 张海东 刘林 张宇雄 刘有胜 邓中原 李文 于 2021-07-29 设计创作，主要内容包括：本发明公开了一种高压输电线路无线测温系统分布式光纤通信方法,属于电力领域,该高压输电线路无线测温系统分布式光纤通信方法基于高压输电线路无线测温系统,具体包括以下步骤：步骤1、半导体激光器产生窄脉宽光脉冲信号进入光纤,经过光波分复用装置,将产生的拉曼散射光耦合至发射模块；步骤2、温度传感器采集到的电压值经DSP高速处理芯片进行数据采集以及解调；步骤3、数据通过发射模块送入光纤在到接收模块进行接收后,在后台数据库中进行存储。通过本发明能够实现长距离,偏远地区的高压铁塔的高压线转接位置的温度测量,实现测量数据的远距离传输。(The invention discloses a distributed optical fiber communication method of a wireless temperature measurement system of a high-voltage transmission line, belonging to the field of electric power, and the distributed optical fiber communication method of the wireless temperature measurement system of the high-voltage transmission line is based on the wireless temperature measurement system of the high-voltage transmission line, and specifically comprises the following steps: step 1, a semiconductor laser generates a narrow pulse width optical pulse signal, the narrow pulse width optical pulse signal enters an optical fiber, and generated Raman scattering light is coupled to an emission module through an optical wavelength division multiplexing device; step 2, the voltage value acquired by the temperature sensor is subjected to data acquisition and demodulation through a DSP high-speed processing chip; and 3, sending the data into the optical fiber through the transmitting module, receiving the data in the receiving module, and storing the data in a background database. The invention can realize the temperature measurement of the high-voltage line switching position of the high-voltage iron tower in long distance and remote areas and realize the long-distance transmission of measurement data.)

1. A distributed optical fiber communication method of a wireless temperature measurement system of a high-voltage transmission line is characterized by comprising the following steps: the distributed optical fiber communication method of the high-voltage transmission line wireless temperature measurement system is based on the high-voltage transmission line wireless temperature measurement system and specifically comprises the following steps:

step 1, a semiconductor laser generates a narrow pulse width optical pulse signal, the narrow pulse width optical pulse signal enters an optical fiber, and generated Raman scattering light is coupled to an emission module through an optical wavelength division multiplexing device;

step 2, the voltage value acquired by the temperature sensor is subjected to data acquisition and demodulation through a DSP high-speed processing chip;

and 3, sending the data into the optical fiber through the transmitting module, receiving the data in the receiving module, and storing the data in a background database.

2. The distributed optical fiber communication method of the wireless temperature measurement system of the high-voltage transmission line according to claim 1, characterized in that: step 2, the voltage value acquired by the temperature sensor is subjected to data acquisition and demodulation through a DSP high-speed processing chip;

the specific demodulation algorithm is as follows:

firstly, analyzing temperature information T by using a formula 1 and a formula 2;

equation 1 is:

in formula 1, k is boltzmann constant, and h is planck constant; c is the speed of light in vacuum; v0 is incident light frequency; t is the absolute temperature; r is a sensor resistance; t is₀The temperature collected by the sensor;

introducing a section of calibration optical fiber, wherein the formula 2 is shown for the temperature data;

equation 2 is:

in formula 2, k is boltzmann's constant, and h is planck's constant; c is the speed of light in vacuum; v0 is incident light frequency; t is the absolute temperature; r is a sensor resistance; t is₀The temperature collected by the sensor; λ a is the anti-stokes photon intensity and λ s is the stokes photon intensity; as can be seen from equations 1 and 2, the temperature information T is only a quantity related to the fiber fixing parameter and the calibration temperature; when the laser pulse is transmitted in the optical fiber, backscattering is generated; the time required for the incident light to return to the incident end of the optical fiber through the scattering point in the optical fiber is t, and the distance L between the scattering point in the optical fiber and the incident end of the optical fiber is as follows:

wherein V is the transmission speed of light in the optical fiber; c is the speed of light in vacuum; n is the refractive index of the optical fiber;

the optical time domain reflection can be used for determining the position of each temperature acquisition point in the optical fiber temperature field and the distance positioning information of an abnormal temperature point, an optical fiber fault point and a breakpoint.

3. The distributed optical fiber communication method of the wireless temperature measurement system of the high-voltage transmission line according to claim 1, characterized in that: the wireless temperature measurement system for the high-voltage transmission line comprises a temperature measurement module, a communication module, a background database, a background server and a mobile terminal, wherein the temperature measurement module and the monitoring module are connected with the background database through the communication module, the background server is connected with the background database, and the mobile terminal is connected with the background database through a mobile network.

4. The distributed optical fiber communication method of the wireless temperature measurement system of the high-voltage transmission line according to claim 3, characterized in that: the temperature measurement module comprises a heat conduction copper sheet, a power supply module, a temperature difference power generation device, a temperature sensor and a temperature measurement processor; wherein, the heat conducting copper sheet is fixed at the cable joint by a bolt; the hot end of the thermoelectric power generation device is arranged above the heat-conducting copper sheet; the temperature sensor is arranged on the heat conduction copper sheet, the signal output end of the temperature sensor is connected with the signal input end of the temperature measurement processor, and the signal output end of the temperature measurement processor is connected with the signal input end of the communication module; the output end of the temperature difference power generation device is connected with the input end of the lithium battery pack, the temperature difference power generation device further comprises a temperature difference power generation sheet, a cold end cooling sheet and a hot end heat transfer medium, the hot end heat transfer medium is tightly installed below the temperature difference power generation sheet through liquid metal, and the cold end cooling sheet is installed above the temperature difference power generation sheet.

5. The distributed optical fiber communication method of the wireless temperature measurement system of the high-voltage transmission line according to claim 4, characterized in that: the power supply module is composed of a temperature difference power generation device and a lithium battery pack, and the power supply module can provide power for the temperature sensor and the temperature measurement processor.

6. The distributed optical fiber communication method of the wireless temperature measurement system of the high-voltage transmission line according to claim 3, characterized in that: the communication module adopts a distributed optical fiber communication module, the communication module comprises an optical signal transmitting module, an optical signal receiving module, an optical wavelength division multiplexing module and a DSP data processing module, the output end of the temperature measuring module is connected with the DSP data processing module, the DSP data processing module is connected with the optical wavelength division multiplexing module, the output end of the optical wavelength division multiplexing module is connected with the input end of the transmitting module, and the output end of the transmitting module is connected with the rear-end optical signal receiving module through an optical fiber.

7. The distributed optical fiber communication method of the wireless temperature measurement system of the high-voltage transmission line according to claim 3, characterized in that: the background database adopts a Mysql database, and the background server is used for the operation and analysis processing of the whole system, and the result display and alarm; the mobile terminal adopts a smart phone or a pad, and can remotely manage the background database.

Technical Field

The invention belongs to the field of electric power, and particularly relates to a distributed optical fiber communication method of a wireless temperature measurement system of a high-voltage transmission line.

Background

The temperature of the joint caused by factors such as resistance, overload and the like is too high, so that the insulation at the joint is poor or burnt, and fire is caused by sudden failure, thereby bringing serious potential safety hazard to an industrial production field and even causing forced shutdown. In addition, the broken line at the jumper of the power transmission line generally has no grounding point, so that certain difficulty is brought to fault location, the power failure time is further prolonged, a serious accident that the production cannot be recovered in a short time is caused, and great economic loss and social influence are caused. Therefore, the jumper joint of the power transmission line is a weak link in the power transmission line, and once the jumper joint fails, the electric energy transmitted by the line is directly interrupted, so that the safe and stable operation of a power grid is endangered.

At present, a regular overhaul system is implemented for the electric power system in China, which is a regular overhaul system for equipment based on a time period. The inspection of a plurality of line lap joints of a power transmission line is a key work of daily operation and maintenance work. At present, the temperature of relevant parts is monitored by means of visual inspection whether an overheating trace exists or an infrared thermometer and an infrared thermal imager. The equipment is expensive to purchase for manual on-site investigation and measurement.

Disclosure of Invention

In order to solve the problems, the invention provides a distributed optical fiber communication method of a wireless temperature measurement system of a high-voltage transmission line.

The technical scheme adopted by the invention is as follows:

a distributed optical fiber communication method of a wireless temperature measurement system of a high-voltage transmission line is based on the wireless temperature measurement system of the high-voltage transmission line and specifically comprises the following steps:

step 1, a semiconductor laser generates a narrow pulse width optical pulse signal, the narrow pulse width optical pulse signal enters an optical fiber, and generated Raman scattering light is coupled to an emission module through an optical wavelength division multiplexing device;

step 2, the voltage value acquired by the temperature sensor is subjected to data acquisition and demodulation through a DSP high-speed processing chip;

and 3, sending the data into the optical fiber through the transmitting module, receiving the data in the receiving module, and storing the data in a background database.

Further, in step 2, the voltage value acquired by the temperature sensor is subjected to data acquisition and demodulation through a DSP high-speed processing chip;

the specific demodulation algorithm is as follows:

firstly, analyzing temperature information T by using a formula 1 and a formula 2;

equation 1 is:

in formula 1, k is boltzmann's constant; h is the Planck constant; c is the speed of light in vacuum; v0 is incident light frequency; t is the absolute temperature; r is a sensor resistance; t is₀The temperature collected by the sensor;

introducing a section of calibration optical fiber, wherein the formula 2 is shown for the temperature data;

equation 2 is:

in formula 2, k is boltzmann's constant; h is the Planck constant; c is the speed of light in vacuum; v0 is incident light frequency; t is the absolute temperature; r is a sensor resistance; t is₀The temperature collected by the sensor; λ a is the anti-stokes photon intensity; λ s is the stokes light photon intensity;

as can be seen from equations 1 and 2, the temperature information T is only a quantity related to the fiber fixing parameter and the calibration temperature; when the laser pulse is transmitted in the optical fiber, backscattering is generated; the time required for the incident light to return to the incident end of the optical fiber through the scattering point in the optical fiber is t, and the distance L between the scattering point in the optical fiber and the incident end of the optical fiber is as follows:

wherein V is the transmission speed of light in the optical fiber; c is the speed of light in vacuum; n is the refractive index of the optical fiber;

the optical time domain reflection can be used for determining the position of each temperature acquisition point in the optical fiber temperature field and the distance positioning information of an abnormal temperature point, an optical fiber fault point and a breakpoint.

Furthermore, the wireless temperature measurement system for the high-voltage transmission line comprises a temperature measurement module, a communication module, a background database, a background server and a mobile terminal, wherein the temperature measurement module and the monitoring module are connected with the background database through the communication module, the background server is connected with the background database, and the mobile terminal is connected with the background database through a mobile network.

Further, the temperature measurement module comprises a heat conduction copper sheet, a power supply module, a temperature difference power generation device, a temperature sensor and a temperature measurement processor; wherein, the heat conducting copper sheet is fixed at the cable joint by a bolt; the hot end of the thermoelectric power generation device is arranged above the heat-conducting copper sheet; the temperature sensor is arranged on the heat conduction copper sheet, the signal output end of the temperature sensor is connected with the signal input end of the temperature measurement processor, and the signal output end of the temperature measurement processor is connected with the signal input end of the communication module; the output end of the temperature difference power generation device is connected with the input end of the lithium battery pack, the temperature difference power generation device further comprises a temperature difference power generation sheet, a cold end cooling sheet and a hot end heat transfer medium, the hot end heat transfer medium is tightly installed below the temperature difference power generation sheet through liquid metal, and the cold end cooling sheet is installed above the temperature difference power generation sheet.

Further, the power supply module comprises thermoelectric generation device and lithium cell group, and the power supply module can provide electric power for temperature sensor, temperature measurement treater.

Furthermore, the communication module adopts a distributed optical fiber communication module, the communication module comprises an optical signal transmitting module, an optical signal receiving module, an optical wavelength division multiplexing module and a DSP data processing module, the output end of the temperature measuring module is connected with the DSP data processing module, the DSP data processing module is connected with the optical wavelength division multiplexing module, the output end of the optical wavelength division multiplexing module is connected with the input end of the transmitting module, and the output end of the transmitting module is connected with the rear-end optical signal receiving module through an optical fiber.

Further, the background database adopts a Mysql database, and the background server is used for operation and analysis processing of the whole system, result display and alarm; the mobile terminal adopts a smart phone or a pad, and can remotely manage the background database.

The invention has the beneficial effects that:

the temperature sensor has a self-generating function, the problem that the battery of the temperature sensor is replaced after the temperature sensor is used in the field for a long time can be solved by automatic power generation, the battery does not need to be replaced in the service life cycle, the generated power can be supplied to other related electronic components for use, distributed optical fiber communication is adopted, compared with a remote wireless communication method, the communication efficiency can be improved, the high fidelity of signals can be ensured, and the problem that the non-wireless network coverage area cannot transmit data can be solved.

Drawings

FIG. 1 is a block diagram of the system of the present invention;

fig. 2 is a block diagram of a distributed fiber optic communications system according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 1-2, a distributed optical fiber communication method of a wireless temperature measurement system of a high-voltage transmission line is based on the wireless temperature measurement system of the high-voltage transmission line.

The wireless temperature measurement system for the high-voltage transmission line comprises a temperature measurement module, a communication module, a background database, a background server and a mobile terminal, wherein the temperature measurement module and the monitoring module are connected with the background database through the communication module and transmit data to the background database, the background server is connected with the background database, and the mobile terminal is connected with the background database through a mobile network.

The wireless temperature measurement module device comprises a heat conduction copper sheet, a power supply module, a temperature difference power generation device, a temperature sensor, a temperature measurement processor, wherein the heat conduction copper sheet is fixed at a cable joint through a bolt; the hot end of the thermoelectric power generation device is arranged above the heat-conducting copper sheet; the temperature sensor is arranged on the heat conduction copper sheet; the signal output end of the temperature sensor is connected with the signal input end of the temperature measurement processor; the signal output end of the temperature measurement processor is connected with the signal input end of the communication module; the output end of the temperature difference power generation device is connected with the input end of the lithium battery pack; the thermoelectric power generation device further comprises a thermoelectric power generation sheet, a cold end cooling fin and a hot end heat transfer medium, wherein the hot end heat transfer medium is tightly installed below the thermoelectric power generation sheet by adopting liquid metal, and the cold end cooling fin is installed above the thermoelectric power generation sheet. The power supply module comprises a temperature difference power generation device and a lithium battery pack, and provides power for the temperature sensor and the temperature measurement processor.

The heat-conducting copper sheet is fixed at the cable joint by a bolt; when the cable joint generates heat, the heat conducting copper sheet transfers the heat to the hot end of the thermoelectric power generation device; the working environment temperature of the temperature sensor arranged on the heat-conducting copper sheet is as follows: -40 ℃ to +90 ℃, measurement range: -55 ℃ to +120 ℃, duty cycle: overtemperature for 1min, alarm for 15min, and normal for 30 min; the signal output end of the temperature sensor is connected with the signal input end of the temperature measurement processor, and the measured temperature data is input into the temperature measurement processor for processing; the signal output end of the temperature measurement processor is connected with the signal input end of the communication module 2; can work normally in the environment of a high-voltage electric field of 110kV to 500 kV.

The output end of the temperature difference power generation device is connected with the input end of the lithium battery pack, wherein the temperature difference power generation device consists of a temperature difference power generation sheet, a cold end radiating sheet and a hot end heat transfer medium; the hot end heat transfer medium adopts liquid metal to be tightly installed below the thermoelectric generation sheet to serve as the hot end, the cold end radiating fin is installed above the thermoelectric generation sheet to serve as the cold end, the thermoelectric generation sheet and the cold end have temperature difference, a potential is generated through the thermoelectric generation sheet, so that current is generated, and then the current is input into the lithium battery pack through the connecting port to be stored; the product model of the lithium battery pack is ER26500, the nominal capacity is 9000mAh, the standard voltage is 3.6V, the working temperature range is-45 ℃ to +80 ℃, the maximum pulse current is 400mA, and the maximum continuous discharge current is 200 mA; the power supply module provides electric power for temperature sensor, temperature measurement treater, and the power supply adopts battery + thermoelectric generation to mix the mode of moving, and the thermoelectric generation difference in temperature requires for the difference between the surface that awaits measuring and ambient temperature: not lower than 3 ℃.

The communication module adopts a distributed optical fiber communication module, the communication module comprises an optical signal transmitting module, an optical signal receiving module, an optical wavelength division multiplexing module and a DSP data processing module, the output end of the temperature measuring module is connected with the DSP data processing module, the DSP data processing module is connected with the optical wavelength division multiplexing module, the output end of the optical wavelength division multiplexing module is connected with the input end of the transmitting module, and the output end of the transmitting module is connected with the rear-end optical signal receiving module through an optical fiber.

The distributed optical fiber communication method of the high-voltage transmission line wireless temperature measurement system is realized by adopting the following steps:

step 1, a semiconductor laser generates a narrow pulse width optical pulse signal, the narrow pulse width optical pulse signal enters an optical fiber, and generated Raman scattering light is coupled to an emission module through an optical wavelength division multiplexing device; due to the fact that anti-Stokes optical signals influenced by temperature are weak, a double-path micro-signal photoelectric detection and signal amplification circuit is adopted for converting the optical signals and the electric signals.

Step 2, the voltage value acquired by the temperature sensor is subjected to data acquisition and demodulation through a DSP high-speed processing chip; the demodulation algorithm is as follows:

firstly, analyzing temperature information T by using a formula 1 and a formula 2;

equation 1 is:

in formula 1, k is boltzmann's constant; h is the Planck constant; c is the speed of light in vacuum; v0 is incident light frequency; t is the absolute temperature; r is a sensor resistance; t is₀The temperature collected by the sensor.

A section of the calibration optical fiber is introduced,to (1) forThe temperature data is given by equation 2:

equation 2 is:

in formula 2, k is boltzmann's constant;h is the Planck constant; c is the speed of light in vacuum; v0 is incident light frequency; t is the absolute temperature; r is a sensor resistance; t is₀The temperature collected by the sensor; λ a is the anti-stokes photon intensity; λ s is the stokes light photon intensity.

As can be seen from equations 1 and 2, the temperature information T is only a quantity related to the fiber fixing parameter and the calibration temperature.

When a laser pulse is transmitted through an optical fiber, backscattering occurs due to microscopic inhomogeneities in the refractive index of the fiber. The time required for the incident light to return to the incident end of the optical fiber through the scattering point in the optical fiber is t, and the distance L between the scattering point in the optical fiber and the incident end of the optical fiber is as follows:

wherein V is the transmission speed of light in the optical fiber; c is the speed of light in vacuum; n is the refractive index of the fiber.

Therefore, the optical time domain reflection technology can be used for determining the position of each temperature acquisition point in the optical fiber temperature field and the distance positioning information of an abnormal temperature point, an optical fiber fault point and a breakpoint.

And 3, sending the data into the optical fiber through the transmitting module, receiving the data in the receiving module, and storing the data in a background database. The optical signal receiving module converts the received optical signals into electric signals, and stores the temperature data in the background database after the electric signals are converted into the electric signals. The mobile terminal and the background server can be conveniently called.

Background database, background server and mobile terminal:

the background database adopts a Mysql database, and the background server is used for the operation and analysis processing of the whole system, and the result display and alarm; the mobile terminal adopts a smart phone or a pad, can remotely manage the background database, and can also be connected to a background server for data sharing. The user can monitor the temperature data in the system on the mobile terminal in real time, and can check historical temperature data stored in the background database. The background server calculates the temperature data in the background database to obtain the change history of the temperature, and when the temperature data exceeds a set value, the background server sends an alarm and transmits an alarm signal to the mobile terminal.

The temperature sensor has a self-generating function, the problem that the battery of the temperature sensor is replaced after the temperature sensor is used in the field for a long time can be solved by automatic power generation, the battery does not need to be replaced in the service life cycle, the generated power can be supplied to other related electronic components for use, distributed optical fiber communication is adopted, compared with a remote wireless communication method, the communication efficiency can be improved, the high fidelity of signals can be ensured, and the problem that the non-wireless network coverage area cannot transmit data can be solved.