阅读说明：本技术 基于光纤振动传感技术的地下电力电缆的防外力破坏预警系统 (Underground power cable external damage prevention early warning system based on optical fiber vibration sensing technology ) 是由 方道奎 许建华 于 2019-09-10 设计创作，主要内容包括：本发明公开了一种基于光纤振动传感技术的地下电力电缆的防外力破坏预警系统,包括光纤振动传感器组件、温湿度传感器、噪声传感器、传感信号采集单元、信号传输单元和监测预警平台,温湿度传感器、噪声传感器分别通过传感信号采集单元连接信号传输单元,光纤振动传感器组件连接信号传输单元,信号传输单元连接微处理器,微处理器通过无线传输模块连接监测预警平台,还包括告警单元、比较单元和存储单元,告警单元、比较单元和存储单元分别连接微处理器,本发明工作原理简单,能够对地下电力电缆进行实时监测,在破坏前立即发出告警信号,此外,还能够对破坏位置进行定位。(The invention discloses an external force damage prevention early warning system of an underground power cable based on an optical fiber vibration sensing technology, which comprises an optical fiber vibration sensor assembly, a temperature and humidity sensor, a noise sensor and a sensing signal acquisition unit, the monitoring and early warning system comprises a signal transmission unit, a monitoring and early warning platform, a temperature and humidity sensor and a noise sensor, wherein the temperature and humidity sensor and the noise sensor are respectively connected with the signal transmission unit through a sensing signal acquisition unit, an optical fiber vibration sensor assembly is connected with the signal transmission unit, the signal transmission unit is connected with a microprocessor, the microprocessor is connected with the monitoring and early warning platform through a wireless transmission module, the monitoring and early warning system also comprises an alarm unit, a comparison unit and a storage unit, and the alarm unit, the comparison unit and the storage unit are respectively connected with the microprocessor.)

1. Underground power cable prevents external damage early warning system based on optic fibre vibration sensing technology, its characterized in that: comprises an optical fiber vibration sensor component (1), a temperature and humidity sensor (2), a noise sensor (3), a sensing signal acquisition unit (4), a signal transmission unit (5) and a monitoring and early warning platform (6), the temperature and humidity sensor (2) and the noise sensor (3) are respectively connected with the signal transmission unit (5) through the sensing signal acquisition unit (4), the optical fiber vibration sensor component (1) is connected with a signal transmission unit (5), the signal transmission unit (5) is connected with a microprocessor (7), the microprocessor (7) is connected with a monitoring and early warning platform (6) through a wireless transmission module (8), the system also comprises an alarm unit (9), a comparison unit (10) and a storage unit (11), the alarm unit (9), the comparison unit (10) and the storage unit (11) are respectively connected with the microprocessor (7).

2. The underground power cable external damage prevention early warning system based on the optical fiber vibration sensing technology as claimed in claim 1, wherein: optical fiber vibration sensor subassembly (1) includes fiber grating current sensor (12) and location terminal (13), location terminal (13) is connected in fiber grating current sensor (12), install on power cable fiber grating current sensor (12), location terminal (13) include light signal unit (14), electric signal unit (15), signal processing unit (16) and failure diagnosis unit (17), electric signal unit (15) are connected in light signal unit (14), failure diagnosis unit (17) are connected through signal processing unit (16) in electric signal unit (15).

3. The underground power cable external damage prevention early warning system based on the optical fiber vibration sensing technology as claimed in claim 2, wherein: the optical signal unit (14) comprises a broadband light source (18), a semiconductor optical amplifier module (19), an optical coupler (20), an optical circulator (21) and an arrayed waveguide grating module (22), wherein the broadband light source (18) is connected with the optical coupler (20) through the semiconductor optical amplifier module (19), the optical coupler (20) is connected with the optical circulator (21), and the optical circulator (21) is connected with the arrayed waveguide grating module (22).

4. The underground power cable external damage prevention early warning system based on the optical fiber vibration sensing technology as claimed in claim 1, wherein: the wireless transmission module (8) adopts a ZigBee transmission unit or a WIFI transmission unit.

5. The underground power cable external damage prevention early warning system based on the optical fiber vibration sensing technology as claimed in claim 1, wherein: the signal transmission unit (5) adopts an optical fiber signal transmission unit.

6. The underground power cable external damage prevention early warning system based on the optical fiber vibration sensing technology as claimed in claim 1, wherein: the temperature and humidity sensor adopts AM 1011.

7. The underground power cable external damage prevention early warning system based on the optical fiber vibration sensing technology as claimed in claim 1, wherein: the noise sensor adopts a GB/T3785-2 type sensor.

8. The underground power cable external damage prevention early warning system based on the optical fiber vibration sensing technology as claimed in claim 1, wherein: the microprocessor (7) adopts an AT89C51 singlechip.

9. The use method of the external damage prevention early warning system for the underground power cable based on the optical fiber vibration sensing technology is realized, and is characterized in that: the using method comprises the following steps:

A. the temperature and humidity sensor and the noise sensor respectively adopt temperature and humidity signals of a power cable and external noise signals, and collected sensing signals are transmitted to the microprocessor through the sensing signal collection unit and the signal transmission unit;

B. an optical signal unit in the optical fiber vibration sensor assembly provides an optical signal, an optical fiber grating current sensor reflects the received optical signal and transmits the optical signal to a signal processing unit to be converted into an electric signal, and a fault diagnosis unit judges whether a fault occurs and the position of the fault according to the current and the central wavelength;

C. and the signals obtained by the positioning terminal are transmitted to the monitoring and early warning platform through the wireless transmission unit for further judgment, and if the abnormity is monitored, the alarm unit immediately sends out alarm signals.

Technical Field

The invention relates to the technical field of power cable monitoring, in particular to an external force damage prevention early warning system of an underground power cable based on an optical fiber vibration sensing technology.

Background

With the development of city construction, modern cities require aboveground spaces without power cable lines, and power cables are the only choice to be introduced into the ground. However, the mutual working connection leak of the operation and maintenance of the power cable and the urban construction department causes frequent accidents of power cable damage in the processes of road reconstruction, subway construction and various municipal engineering construction, and the power grid safety and the property safety of people are seriously endangered. Through statistical analysis of recent high-voltage power cable accidents, external force damage is found to be a main cause of power cable faults. Therefore, it is an important research topic to find out in time before the power cable is damaged so as to stop the damage in time.

Disclosure of Invention

The invention aims to provide an external force damage prevention early warning system of an underground power cable based on an optical fiber vibration sensing technology, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the underground power cable external force damage prevention early warning system based on the optical fiber vibration sensing technology comprises an optical fiber vibration sensor assembly, a temperature and humidity sensor, a noise sensor, a sensing signal acquisition unit, a signal transmission unit and a monitoring early warning platform, wherein the temperature and humidity sensor and the noise sensor are connected with the signal transmission unit through the sensing signal acquisition unit respectively, the optical fiber vibration sensor assembly is connected with the signal transmission unit, the signal transmission unit is connected with a microprocessor, the microprocessor is connected with the monitoring early warning platform through a wireless transmission module and further comprises an alarming unit, a comparison unit and a storage unit, and the alarming unit, the comparison unit and the storage unit are connected with the microprocessor respectively.

Preferably, the optical fiber vibration sensor assembly comprises an optical fiber grating current sensor and a positioning terminal, the optical fiber grating current sensor is connected with the positioning terminal, the optical fiber grating current sensor is installed on the power cable, the positioning terminal comprises an optical signal unit, an electrical signal unit, a signal processing unit and a fault diagnosis unit, the optical signal unit is connected with the electrical signal unit, and the electrical signal unit is connected with the fault diagnosis unit through the signal processing unit.

Preferably, the optical signal unit comprises a broadband light source, a semiconductor optical amplifier module, an optical coupler, an optical circulator and an arrayed waveguide grating module, the broadband unit is connected with the optical coupler through the semiconductor optical amplifier module, the optical coupler is connected with the optical circulator, and the optical circulator is connected with the arrayed waveguide grating module.

Preferably, the wireless transmission module adopts a ZigBee transmission unit or a WIFI transmission unit.

Preferably, the signal transmission unit is an optical fiber signal transmission unit.

Preferably, the temperature and humidity sensor is in the type of AM 1011.

Preferably, the noise sensor adopts a GB/T3785-2 sensor.

Preferably, the microprocessor adopts an AT89C51 singlechip.

Preferably, the using method comprises the following steps:

A. the temperature and humidity sensor and the noise sensor respectively adopt temperature and humidity signals of a power cable and external noise signals, and collected sensing signals are transmitted to the microprocessor through the sensing signal collection unit and the signal transmission unit;

B. an optical signal unit in the optical fiber vibration sensor assembly provides an optical signal, an optical fiber grating current sensor reflects the received optical signal and transmits the optical signal to a signal processing unit to be converted into an electric signal, and a fault diagnosis unit judges whether a fault occurs and the position of the fault according to the current and the central wavelength;

C. and the signals obtained by the positioning terminal are transmitted to the monitoring and early warning platform through the wireless transmission unit for further judgment, and if the abnormity is monitored, the alarm unit immediately sends out alarm signals.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention has simple working principle, can monitor the underground power cable in real time, immediately send out an alarm signal before the damage, and can position the damage position.

(2) The optical fiber vibration sensor assembly adopted by the invention adopts the optical fiber grating current sensor, can monitor the current information of the power cable line in real time, thereby finding out the fault in time, accurately acquiring the position of the fault point according to the position of the optical fiber grating current sensor and further improving the fault monitoring efficiency.

Drawings

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

fig. 2 is a schematic diagram of a fiber optic vibration sensor assembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: the system comprises an optical fiber vibration sensor assembly 1, a temperature and humidity sensor 2, a noise sensor 3, a sensing signal acquisition unit 4, a signal transmission unit 5 and a monitoring and early warning platform 6, wherein the temperature and humidity sensor 2 and the noise sensor 3 are respectively connected with the signal transmission unit 5 through the sensing signal acquisition unit 4, the optical fiber vibration sensor assembly 1 is connected with the signal transmission unit 5, the signal transmission unit 5 is connected with a microprocessor 7, the microprocessor 7 is connected with the monitoring and early warning platform 6 through a wireless transmission module 8, the system also comprises an alarm unit 9, a comparison unit 10 and a storage unit 11, and the alarm unit 9, the comparison unit 10 and the storage unit 11 are respectively connected with the microprocessor 7; the wireless transmission module 8 adopts a ZigBee transmission unit or a WIFI transmission unit; the signal transmission unit adopts an optical fiber signal transmission unit; the temperature and humidity sensor adopts AM 1011; the noise sensor adopts a GB/T3785-2 type sensor; the microprocessor adopts an AT89C51 singlechip.

In the invention, the optical fiber vibration sensor assembly 1 comprises an optical fiber grating current sensor 12 and a positioning terminal 13, the fiber grating current sensor 12 is connected with a positioning terminal 13, the fiber grating current sensor 12 is installed on a power cable, the positioning terminal 13 includes an optical signal unit 14, an electrical signal unit 15, a signal processing unit 16 and a fault diagnosis unit 17, the optical signal unit 14 includes a broadband light source 18, a semiconductor optical amplifier module 19, an optical coupler 20, an optical circulator 21 and an arrayed waveguide grating module 22, the broadband light source 18 is connected with an optical coupler 20 through a semiconductor optical amplifier module 19, the optical coupler 20 is connected with an optical circulator 21, the optical circulator 21 is connected with the arrayed waveguide grating module 22, the optical signal unit 14 is connected with the electrical signal unit 15, the electrical signal unit 15 is connected to a fault diagnosis unit 17 via a signal processing unit 16. The optical fiber vibration sensor assembly adopted by the invention adopts the optical fiber grating current sensor, can monitor the current information of the power cable line in real time, thereby finding out the fault in time, accurately acquiring the position of the fault point according to the position of the optical fiber grating current sensor and further improving the fault monitoring efficiency.

The working principle is as follows: the using method of the invention comprises the following steps:

A. the temperature and humidity sensor and the noise sensor respectively adopt temperature and humidity signals of a power cable and external noise signals, and collected sensing signals are transmitted to the microprocessor through the sensing signal collection unit and the signal transmission unit;

B. an optical signal unit in the optical fiber vibration sensor assembly provides an optical signal, an optical fiber grating current sensor reflects the received optical signal and transmits the optical signal to a signal processing unit to be converted into an electric signal, and a fault diagnosis unit judges whether a fault occurs and the position of the fault according to the current and the central wavelength;

C. and the signals obtained by the positioning terminal are transmitted to the monitoring and early warning platform through the wireless transmission unit for further judgment, and if the abnormity is monitored, the alarm unit immediately sends out alarm signals.

In conclusion, the underground power cable monitoring system has a simple working principle, can monitor the underground power cable in real time, immediately sends out an alarm signal before damage, and can position the damage position.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.