CN111238573A - Optical fiber type multi-parameter cable terminal detection system - Google Patents
Optical fiber type multi-parameter cable terminal detection system Download PDFInfo
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- CN111238573A CN111238573A CN202010183096.5A CN202010183096A CN111238573A CN 111238573 A CN111238573 A CN 111238573A CN 202010183096 A CN202010183096 A CN 202010183096A CN 111238573 A CN111238573 A CN 111238573A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 53
- 238000001514 detection method Methods 0.000 title claims abstract description 30
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- 238000012545 processing Methods 0.000 claims abstract description 23
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- 238000007689 inspection Methods 0.000 claims description 2
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- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/268—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light using optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/36—Forming the light into pulses
- G01D5/38—Forming the light into pulses by diffraction gratings
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Abstract
An optical fiber type multi-parameter cable terminal detection system provides a synchronous signal to a data acquisition unit while a sawtooth wave driver drives an adjustable laser, the output optical signal of the adjustable laser passes through the optical isolator, the optical circulator and the optical splitter to reach the fiber grating sensor laid at the cable terminal, the wavelength signal reflected by the fiber grating sensor returns to pass through the optical splitter and the optical circulator respectively, then the photoelectric detector converts the optical signal into an electric signal, and then the electric signal is sent to the data acquisition unit, the data acquisition unit transmits the acquired digital signal to the central processing unit, the central processing unit compares and analyzes the voltage signal generated by the current group of sawtooth wave signals with the voltage signal generated by the next group of sawtooth wave signals, and then sends the detection data to the terminal equipment through the communication module. The invention effectively solves the problems of power supply on the installation site and remote sensing and transmission, and has higher detection sensitivity.
Description
Technical Field
The invention relates to the field of safety monitoring, in particular to an optical fiber type multi-parameter cable terminal detection system.
Background
Along with the deep development of urban network transformation engineering, YJLV 22-8.7/15 KV rubber insulated power cables are designed and selected for power supply at a 10KV line outgoing section of a transformer substation, a 10KV power supply line incoming section of an industrial park client, a town 10KV power distribution line, a box type variable 10KV power supply incoming line and the like for convenience in construction, reduction in occupied area of a line corridor and improvement of power supply reliability. The cable terminal is matched with the thermal shrinkage terminal in the early stage and the cold shrinkage terminal in the later stage, but after the cable line is put into operation for 3-5 years, the cable terminal breaks down for many times every year, so that a transformer substation or a line section switch trips, and the reliability of 10KV urban network power supply is directly influenced.
The cable terminal installed outdoors is affected by factors such as wind, rain, snow and thunder and lightning and temperature, and is damaged due to insulation aging after running for many years. And outdoor cable terminal on pole is in the first section of cable run, receives the invasion and attack of thunder and lightning overvoltage easily, and when the lightning rod discharged, the lightning current flowed into the ground through ground wire earthing device, can produce the pressure drop on earthing device's resistance, if cable earthing device's resistance is greater than 10 omega, the pressure drop of production was great, and the residual voltage of arrester can add on the insulator of cable core to terminal, can make the insulating discharge of phase line puncture. Once the faults occur, most faults are in a small range, and the whole system cannot be influenced; however, there are few avalanche cascading failures, i.e., starting from a very simple failure, a series of cascading reactions is triggered, resulting in the breakdown of most or even the entire system of the network. Therefore, various health parameters of the cable terminal can be accurately evaluated in real time, and the method has important significance for engineering construction and medium-long term planning.
At present, the detection of the cable terminal can only depend on the traditional manual detection mode, and no mode which can carry out on-line detection, particularly the mode of measuring the cable terminal through an optical fiber sensor exists.
Disclosure of Invention
The invention mainly solves the problem of online detection of the cable terminal, avoids the cable terminal from being damaged to cause power failure accidents, causes loss to production and brings influence to life, and provides an optical fiber type multi-parameter cable terminal detection system.
The technical scheme of the invention is as follows:
the invention discloses an optical fiber type multi-parameter cable terminal detection system which comprises an optical fiber sensing module and a processing module, wherein the optical fiber sensing module comprises a sawtooth wave driver, a tunable laser, an optical isolator, an optical circulator, an optical fiber branching unit and an optical fiber grating sensor, the sawtooth wave driver provides sawtooth wave signals to enable the tunable laser to scan from short wavelength to long wavelength, the output wavelength of the tunable laser is 1525-1605 nm, and each sawtooth wave emitted by the sawtooth wave driver can generate a set of spectrogram from 1525-1605 nm. The output end of the adjustable laser is connected with the input end of the optical isolator, the output end of the optical isolator is connected with the optical circulator, the optical circulator is connected with the optical fiber branching unit, and the optical circulator controls light to be input only from the optical isolator and not to return to avoid damaging the adjustable laser. And the rear part of the optical fiber branching unit is connected with a plurality of optical fiber grating sensors, and the optical fiber grating sensors are laid at each cable terminal.
The processing module comprises a photoelectric detector, a data acquisition unit and a central processing unit, the photoelectric detector is connected with the optical circulator, the reflected wavelength spectrum of the fiber grating sensor is reflected and then sequentially passes through the fiber branching unit and the optical circulator, then the optical signals enter a photoelectric detector, the photoelectric detector demodulates the optical signals into electric signals, the electric signals are sent to a data acquisition unit, the data acquisition unit acquires the electric signals transmitted by the photoelectric detector, meanwhile, the sawtooth wave driver can also provide a synchronous signal to the data acquisition unit when providing the sawtooth wave signal to the tunable laser, the data acquisition unit transmits the acquired digital signals to the central processing unit, and the central processing unit compares and analyzes the voltage signals generated by the current group of sawtooth wave signals with the voltage signals generated by the next group of sawtooth wave signals.
The optical fiber type multi-parameter cable termination detection system comprises a plurality of output ports.
According to the optical fiber type multi-parameter cable terminal detection system, the optical fiber grating sensor comprises an optical fiber grating temperature sensor, an optical fiber grating vibration sensor, an optical fiber grating strain sensor and an optical fiber grating displacement sensor, and can be used for simultaneously measuring a plurality of parameters of the cable terminal.
The fiber bragg grating vibration sensor can detect whether the joint of the cable terminal is vibrated or not.
The fiber grating temperature sensor can detect the temperature of the cable terminal, and can play a role in early warning if the temperature is high, which indicates that the operation is abnormal.
The fiber bragg grating strain sensor can detect whether the cable terminal is subjected to thermal expansion deformation or not.
The fiber bragg grating displacement sensor can detect the relative displacement between the cable terminal and the mounting base body, and early warning can be carried out in advance to avoid the falling of a cable of the cable terminal.
Furthermore, the wavelength range of the fiber grating sensors is 1525-1605 nm, and the wavelengths of the fiber grating sensors are not overlapped with each other.
According to the optical fiber type multi-parameter cable terminal detection system, the communication module is connected to the back of the central processing unit, and detection data are sent to terminal equipment, such as a computer in a monitoring room, through the communication module.
The invention has the beneficial effects that:
1. the optical fiber type multi-parameter cable terminal detection system is different from the traditional detection mode aiming at the whole cable, only the optical fiber grating sensor is arranged at the cable terminal, the grating reflection principle is utilized to effectively detect and analyze the state of the cable terminal in real time, the optical cable is used as a transmission and sensing element, signal induction is carried out by the optical fiber, power supply is not needed, electromagnetic influence is avoided, corrosion resistance is realized, the optical fiber type multi-parameter cable terminal detection system is suitable for various complex installation environments, and the problems of power supply at the installation site and remote sensing and transmission are effectively solved.
2. The optical fiber type multi-parameter cable terminal detection system has higher optical signal detection sensitivity and improves the accuracy of alarm signals.
3. The optical fiber type multi-parameter cable terminal detection system can be conveniently expanded by increasing the number of the optical fiber branching units, realizes real-time online safety monitoring and alarming of a plurality of cable terminals, can accurately distinguish the positions of the alarming cable terminals, and improves the effectiveness and accuracy of the alarming positions.
Drawings
The aspects and advantages of the present application will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
In the drawings:
fig. 1 is a frame diagram of the optical fiber type multi-parameter cable termination inspection system of the present embodiment 1;
fig. 2 is a spectrum distribution diagram of the fiber grating sensor of the present embodiment 1;
fig. 3 is a layout structure diagram of the fiber grating sensor in the cable terminal of the embodiment 1;
the components represented by the reference numerals in the figures are:
61. the fiber grating strain sensor comprises a fiber grating temperature sensor 62, a fiber grating vibration sensor 63, a fiber grating strain sensor 64 and a fiber grating displacement sensor.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that these embodiments are provided so that this disclosure can be more completely understood and fully conveyed to those skilled in the art, and the present disclosure may be implemented in various forms without being limited to the embodiments set forth herein.
Example 1
Referring to fig. 1, fig. 1 is a frame diagram of an optical fiber type multi-parameter cable terminal detection system of this embodiment, which includes an optical fiber sensing module and a processing module, where the optical fiber sensing module includes a sawtooth wave driver, a tunable laser, an optical isolator, an optical circulator, an optical fiber splitter and an optical fiber grating sensor, the sawtooth wave driver provides a sawtooth wave signal to scan the tunable laser from a short wavelength to a long wavelength, an output wavelength of the tunable laser is 1525-1605 nm, and each sawtooth wave emitted by the sawtooth wave driver generates a set of spectrograms from 1525-1605 nm. The output end of the tunable laser is connected with the input end of the optical isolator, and the optical isolator is added, so that the signal reflected by a rear light path can be effectively prevented from returning to the tunable laser, and the laser is damaged.
Furthermore, the output end of the optical isolator is connected with an optical circulator, the optical circulator is connected with an optical fiber branching unit, and the optical circulator controls light to be input from the optical isolator only and not to return so as to avoid damaging the adjustable laser. The fiber grating optical fiber cable is characterized in that a plurality of fiber grating sensors are connected behind the fiber splitter, the fiber grating sensors can be connected in series through signals for wavelength division multiplexing, and the fiber grating sensors are laid at each cable terminal. Preferably, the optical fiber splitter comprises a plurality of output ports, and each output port is connected with a plurality of fiber grating sensors, so that monitoring of the multi-channel fiber grating sensors can be realized. The fiber grating sensor state diagram laid at the cable terminal by the single channel is only drawn in fig. 1, only one cable terminal can be installed to be used as the single channel, the monitoring of the multi-channel fiber grating sensor can be realized according to the number of the used scene expansion cable terminals, the expansibility is strong, and the limitation is not made at the position.
Further, the fiber grating sensor in the present embodiment includes a fiber grating temperature sensor 61, a fiber grating vibration sensor 62, a fiber grating strain sensor 63, and a fiber grating displacement sensor 64, and the laying state of the fiber grating sensor at the cable terminal is shown in fig. 3. Through the arrangement of each fiber grating sensor, a plurality of parameters of the cable terminal can be measured simultaneously.
The fiber grating vibration sensor 62 can detect whether the cable terminal connection is subjected to vibration.
The fiber grating temperature sensor 61 can detect the temperature of the cable terminal, and if the temperature is high, the operation abnormality can be early-warning.
The fiber grating strain sensor 63 can detect whether the cable terminal is thermally expanded and deformed.
The fiber grating displacement sensor 64 can detect the relative displacement between the cable terminal and the mounting substrate, and can pre-warn in advance to avoid the falling of the cable terminal.
Furthermore, the wavelength range of the fiber grating sensor is also 1525-1605 nm, which is shown in fig. 2 and is consistent with the output wavelength of the tunable laser, so that the reflection wavelength of the fiber grating sensor can be conveniently presented in a spectrogram. Also, here, the wavelengths of the respective fiber grating sensors do not coincide with each other.
Furthermore, the processing module comprises a photoelectric detector, a data collector and a central processing unit, wherein the photoelectric detector is connected with an optical circulator, the reflected wavelength spectrums of the four fiber grating sensors sequentially pass through an optical fiber branching device and the optical circulator after being reflected, then enter the photoelectric detector for collecting optical signals in real time, the photoelectric detector demodulates the optical signals into electric signals and sends the electric signals to the data collector, the data collector collects the electric signals transmitted by the photoelectric detector, meanwhile, the sawtooth wave driver also provides a synchronous signal to the data collector when providing sawtooth wave signals to the tunable laser, the data collector transmits the collected digital signals to the central processing unit, and the central processing unit compares the voltage signals generated by the sawtooth wave signals of the current group with the voltage signals generated by the sawtooth wave signals of the next group for analysis, the signal variation of the optical wavelength between each time can be known.
Furthermore, a communication module is connected behind the central processing unit, and the detection data is sent to the terminal equipment through the communication module.
The specific operation process and principle of the system are as follows:
the sawtooth wave driver drives the adjustable laser and simultaneously provides a synchronous signal for the data collector, the adjustable laser outputs an optical signal to the fiber grating sensor laid on the cable terminal through the optical isolator, the optical circulator and the fiber branching unit, the fiber grating sensor comprises a fiber grating temperature sensor 61, a fiber grating vibration sensor 62, a fiber grating strain sensor 63 and a fiber grating displacement sensor 64, a wavelength signal reflected by the fiber grating sensor returns back again, the wavelength signal passes through the fiber branching unit and the optical circulator respectively, then the optical signal is converted into an electric signal through the photoelectric detector, then the electric signal is sent to the data collector, the data collector transmits the collected digital signal to the central processing unit, the central processing unit compares the voltage signal generated by the current group of sawtooth wave signals with the voltage signal generated by the next group of sawtooth wave signals for analysis, the change of the optical wavelength signal between each time can be known, and then the central processing unit sends the detection data to the terminal equipment, such as a computer in a monitoring room, through the communication module.
This optical fiber type multi-parameter cable termination detecting system, be different from the traditional detection mode to whole cable, only set up the fiber grating sensor at the cable termination, utilize grating reflection principle, carry out effectual real-time detection analysis to the state of cable termination, regard as transmission and sensing element with the cable, rely on optic fibre to carry out signal induction, need not supply power, do not receive the electromagnetic influence, it is corrosion-resistant, be applicable to various complicated installation environment, the problem of installation site power supply and remote sensing, transmission has effectively been solved, light signal detection sensitivity is higher, alarm signal's accuracy has been improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or additions or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. An optical fiber type multi-parameter cable terminal detection system is characterized by comprising an optical fiber sensing module and a processing module, wherein the optical fiber sensing module comprises a sawtooth wave driver, a tunable laser, an optical isolator, an optical circulator, an optical fiber branching unit and optical fiber grating sensors, the sawtooth wave driver provides sawtooth wave signals to enable the tunable laser to scan from short wavelength to long wavelength, the output end of the tunable laser is connected with the input end of the optical isolator, the output end of the optical isolator is connected with the optical circulator, the optical circulator is connected with the optical fiber branching unit, the optical circulator controls light to be input from the optical isolator only but not to return, a plurality of optical fiber grating sensors are connected to the rear of the optical fiber branching unit, and the optical fiber grating sensors are laid at each cable terminal;
the processing module comprises a photoelectric detector, a data acquisition unit and a central processing unit, the photoelectric detector is connected with the optical circulator, the reflected wavelength spectrum of the fiber grating sensor is reflected and then sequentially passes through the fiber branching unit and the optical circulator, then the optical signals enter a photoelectric detector, the photoelectric detector demodulates the optical signals into electric signals, the electric signals are sent to a data acquisition unit, the data acquisition unit acquires the electric signals transmitted by the photoelectric detector, meanwhile, the sawtooth wave driver can also provide a synchronous signal to the data acquisition unit when providing the sawtooth wave signal to the tunable laser, the data acquisition unit transmits the acquired digital signals to the central processing unit, and the central processing unit compares and analyzes the voltage signals generated by the current group of sawtooth wave signals with the voltage signals generated by the next group of sawtooth wave signals.
2. The optical fiber type multiparameter cable termination detecting system according to claim 1, wherein an output wavelength of said tunable laser is 1525 to 1605 nm.
3. The fiber optic multiparameter cable termination inspection system of claim 1, wherein the fiber optic splitter includes a plurality of output ports.
4. An optical fiber type multiparameter cable termination detecting system according to claim 2, wherein said fiber grating sensor includes a fiber grating temperature sensor (61), a fiber grating vibration sensor (62), a fiber grating strain sensor (63) and a fiber grating displacement sensor (64).
5. The optical fiber type multiparameter cable termination detection system according to claim 4, wherein the wavelength range of said fiber grating sensor is 1525 to 1605 nm.
6. The system of claim 1, wherein a communication module is connected to the rear of the central processing unit, and the detection data is transmitted to the terminal device through the communication module.
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| CN202010183096.5A CN111238573A (en) | 2020-03-16 | 2020-03-16 | Optical fiber type multi-parameter cable terminal detection system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111811553A (en) * | 2020-07-27 | 2020-10-23 | 中央民族大学 | Sensor network and method based on photon lantern optical fiber |
| CN112097811A (en) * | 2020-09-02 | 2020-12-18 | 中国计量大学 | Nonlinear interference type double-parameter sensor based on correlation injection scheme |
| CN112964301A (en) * | 2021-02-09 | 2021-06-15 | 广东电网有限责任公司 | Monitoring method, device, system, equipment and storage medium of power pipeline |
| CN113280905A (en) * | 2021-06-02 | 2021-08-20 | 中国科学院长春光学精密机械与物理研究所 | Laser testing device and method thereof |
| CN113465656A (en) * | 2021-04-30 | 2021-10-01 | 潍坊嘉腾液压技术有限公司 | Tester for detecting fluid composite parameters and data processing method |
-
2020
- 2020-03-16 CN CN202010183096.5A patent/CN111238573A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111811553A (en) * | 2020-07-27 | 2020-10-23 | 中央民族大学 | Sensor network and method based on photon lantern optical fiber |
| CN111811553B (en) * | 2020-07-27 | 2022-05-17 | 中央民族大学 | Sensor network and method based on photon lantern optical fiber |
| CN112097811A (en) * | 2020-09-02 | 2020-12-18 | 中国计量大学 | Nonlinear interference type double-parameter sensor based on correlation injection scheme |
| CN112964301A (en) * | 2021-02-09 | 2021-06-15 | 广东电网有限责任公司 | Monitoring method, device, system, equipment and storage medium of power pipeline |
| CN113465656A (en) * | 2021-04-30 | 2021-10-01 | 潍坊嘉腾液压技术有限公司 | Tester for detecting fluid composite parameters and data processing method |
| CN113465656B (en) * | 2021-04-30 | 2023-08-15 | 潍坊嘉腾液压技术有限公司 | Tester for detecting fluid composite parameters and data processing method |
| CN113280905A (en) * | 2021-06-02 | 2021-08-20 | 中国科学院长春光学精密机械与物理研究所 | Laser testing device and method thereof |
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