CN217213097U

CN217213097U - Transformer multi-parameter monitoring system based on distributed optical fiber sensing

Info

Publication number: CN217213097U
Application number: CN202220294775.4U
Authority: CN
Inventors: 周航; 康利军; 殷俊; 刘帆; 郑皓文; 单娟; 陈九歌
Original assignee: XI'AN HEQI OPTO-ELECTRONIC TECHNOLOGY CO LTD
Current assignee: XI'AN HEQI OPTO-ELECTRONIC TECHNOLOGY CO LTD
Priority date: 2022-02-14
Filing date: 2022-02-14
Publication date: 2022-08-16
Anticipated expiration: 2032-02-14

Abstract

The utility model relates to a transformer monitoring system, concretely relates to transformer multi-parameter monitoring system based on distributed optical fiber sensing for there is system architecture complicacy, poor stability, sensitivity not high and can not quantitative measurement's weak point in solving current transformer monitoring system based on distributed optical fiber temperature measurement vibration measurement. This transformer multi-parameter monitoring system based on distributed optical fiber sensing includes temperature measurement subassembly, vibration measurement subassembly, data acquisition module, single mode fiber, photoswitch and host computer, and it adopts single mode fiber to carry out real-time supervision to the temperature anomaly and the vibration anomaly of transformer, has anti-electromagnetic interference, and sensitivity is high, stable strong advantage.

Description

Transformer multi-parameter monitoring system based on distributed optical fiber sensing

Technical Field

The utility model relates to a transformer monitoring system, concretely relates to transformer multi-parameter monitoring system based on distributed optical fiber sensing.

Background

Transformers occupy a significant position in the whole power grid, and in the event of transformer damage, the most reasons are that the transformer core is loose, the winding temperature is too high, and the transformer winding is deformed. In the operation process of the transformer, the iron core and the winding are always in a slight vibration state, the iron core and the winding of the transformer are likely to be loose in structure due to long-time vibration, the winding is likely to be deformed by serious people, and particularly, the deformation process of the winding is accelerated by heat and kinetic energy generated by huge current during short circuit, so that the temperature and vibration of the transformer need to be monitored in real time.

The traditional transformer monitoring means is manual inspection, too depends on the experience of inspection personnel, and cannot quickly locate the position of a fault point in the transformer. With the rapid development of the optical fiber sensing technology, a transformer monitoring system based on distributed optical fiber temperature and vibration measurement appears, but the transformer monitoring system has the defects of complex system structure, poor stability, low sensitivity and incapability of quantitative measurement.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the current transformer monitoring system based on distributed optical fiber temperature measurement vibration measurement and has the weak point that the system architecture is complicated, poor stability, sensitivity are not high and can not quantitative measurement, and provide a transformer multi-parameter monitoring system based on distributed optical fiber sensing.

In order to solve the disadvantages existing in the prior art, the utility model provides the following technical solution:

a transformer multi-parameter monitoring system based on distributed optical fiber sensing is characterized in that: the device comprises a temperature measurement component, a vibration measurement component, a data acquisition module, a single mode fiber, an optical switch and an upper computer;

the temperature measurement assembly comprises a first laser, a first circulator, a Raman filter and an APD module which are sequentially connected in output and input, and the output end of the APD module is connected with the first input end of the data acquisition module; the first laser is used for generating first pulsed light;

the vibration measurement unit comprises a second laser, an acousto-optic modulation module, a Raman amplification module, a second circulator, a 2 x 2 coupler and a balance detector, wherein the output and the input of the second laser are sequentially connected, and a second output end of the second laser is connected with a second input end of the 2 x 2 coupler; the output end of the balance detector is connected with the second input end of the data acquisition module; the second laser is used for generating continuous light, part of the continuous light is modulated into second pulse light through the acousto-optic modulation module, and the rest continuous light enters the 2 x 2 coupler;

the single-mode optical fiber is wound on a winding and an iron core in the transformer to be monitored, and is respectively interconnected with the first circulator and the second circulator through the optical switch;

the first output end of the data acquisition module is connected with the input end of the first laser, and the second output end of the data acquisition module is connected with the second input end of the acousto-optic modulation module;

the upper computer is interconnected with the data acquisition module.

Further, 80% -95% of continuous light generated by the second laser is input into the acousto-optic modulation module, and the rest continuous light is input into the 2 x 2 coupler.

Further, 90% of the continuous light generated by the second laser is input into the acousto-optic modulation module, and the rest of the continuous light is input into the 2 x 2 coupler.

Further, the continuous light is ultra-narrow linewidth continuous light with the wavelength of 1550 nm.

Further, the wavelength of the first pulse light is 1550 nm.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model discloses a many parameters of transformer monitoring system based on distributed optical fiber sensing, this system adopt single mode fiber to carry out real-time supervision to the temperature anomaly and the vibration anomaly of transformer, have anti-electromagnetic interference, sensitivity is high, the strong advantage of stability.

(2) The utility model discloses not only can the qualitative measurement, can also acquire vibration amplitude and vibration frequency to realize the quantitative measurement.

(3) The utility model discloses well temperature measurement subassembly and the same root single mode fiber of subassembly sharing that shakes of surveying has simplified system architecture.

Drawings

Fig. 1 is the utility model relates to a transformer multi-parameter monitoring system embodiment's based on distributed optical fiber sensing structural schematic.

The reference numerals are explained below: 1-a temperature measuring component, 11-a first laser, 12-a first circulator, 13-a Raman filter and 14-an APD module; 2-vibration measuring component, 21-second laser, 22-acousto-optic modulation module, 23-Raman amplification module, 24-second circulator, 25-2 x 2 coupler and 26-balance detector; 3-a data acquisition module; 4-single mode fiber; 5-an optical switch; 6-an upper computer.

Detailed Description

The invention will be further described with reference to the drawings and exemplary embodiments.

Referring to fig. 1, a distributed optical fiber sensing-based transformer multi-parameter monitoring system comprises a temperature measurement component 1, a vibration measurement component 2, a data acquisition module 3, a single mode optical fiber 4, an optical switch 5 and an upper computer 6.

The temperature measurement component 1 comprises a first laser 11, a first circulator 12, a Raman filter 13 and an APD module 14 which are connected in sequence in output and input, wherein the output end of the APD module 14 is connected with the first input end of the data acquisition module 3; the first laser 11 is used to generate first pulsed light with a wavelength of 1550 nm.

The vibration measurement unit comprises a second laser 21, an acousto-optic modulation module 22, a Raman amplification module 23, a second circulator 24, a 2 x 2 coupler 25 and a balance detector 26, wherein the output and the input of the second laser 21 are sequentially connected, and a second output end of the second laser 21 is connected with a second input end of the 2 x 2 coupler 25; the output end of the balance detector 26 is connected with the second input end of the data acquisition module 3; the second laser 21 is used for generating ultra-narrow line width continuous light with the wavelength of 1550nm, 90% of the continuous light is modulated into second pulse light through the acousto-optic modulation module 22, and the rest continuous light enters the 2 × 2 coupler 25.

The single-mode optical fiber 4 is wound on a winding and an iron core in the transformer to be monitored, and the single-mode optical fiber 4 is respectively interconnected with the first circulator 12 and the second circulator 24 through the optical switch 5; the corresponding relation between the specific positions of the winding and the iron core of the transformer to be monitored and the length of the single-mode optical fiber 4 can be obtained through position calibration.

A first output end of the data acquisition module 3 is connected with an input end of the first laser 11 and is used for providing a first trigger signal for the first laser 11; a second output end of the data acquisition module 3 is connected to a second input end of the acousto-optic modulation module 22, and is configured to provide a second trigger signal for the acousto-optic modulation module 22.

The upper computer 6 is interconnected with the data acquisition module 3.

The utility model discloses the working process is as follows:

step (1), realizing a temperature measuring function;

(1.1) communicating the single-mode fiber 4 with a first circulator 12 through an optical switch 5;

(1.2) the upper computer 6 sends a first trigger signal to the first laser 11 through the data acquisition module 3, so that the first laser 11 generates first pulse light with the wavelength of 1550nm, and the first pulse light is input into the single-mode optical fiber 4 through the first circulator 12 and the optical switch 5 in sequence;

(1.3) the first pulse light and the single-mode fiber 4 act to generate first backward scattering light, and the first backward scattering light sequentially passes through the optical switch 5 and the first circulator 12 and is input into the Raman filter 13;

(1.4) the raman filter 13 filters out most of the rayleigh scattered light and brillouin scattered light in the first backscattered light, leaving only raman stokes light and raman anti-stokes light to be input to the APD module 14;

(1.5) the APD module 14 converts the Raman Stokes light and the Raman anti-Stokes light into a first electric analog signal and then inputs the first electric analog signal into the data acquisition module 3;

(1.6) converting the first electric analog signal into a first electric digital signal by the data acquisition module 3 and inputting the first electric digital signal into the upper computer 6;

(1.7) the upper computer 6 carries out calculation processing analysis on the first electric digital signal to obtain the relation between the temperature and the position;

step (2), realizing the vibration measurement function;

(2.1) communicating the single-mode fiber 4 with the second circulator 24 through the optical switch 5;

(2.2) the second laser 21 generates ultra-narrow line-width continuous light with the wavelength of 1550nm, 90% of the continuous light is input into the acousto-optic modulation module 22, and 10% of the continuous light is input into the 2 x 2 coupler 25;

(2.3) the upper computer 6 sends a second trigger signal to the acousto-optic modulation module 22 through the data acquisition module 3, so that the acousto-optic modulation module 22 modulates 90% of continuous light into second pulsed light and then inputs the second pulsed light into the raman amplification module 23;

(2.4) amplifying the second pulse light by the Raman amplification module 23, wherein the amplified second pulse light sequentially passes through the second circulator 24 and the optical switch 5 and is input into the single-mode fiber 4;

(2.5) the amplified second pulse light acts on the single-mode fiber 4 to generate second backward scattering light, and the second backward scattering light sequentially passes through the optical switch 5 and the second circulator 24 to enter the 2 × 2 coupler 25 and mix with 10% continuous light in the 2 × 2 coupler 25;

(2.6) inputting the optical signal after frequency mixing into a balance detector 26, converting the optical signal after frequency mixing into a second electrical analog signal by the balance detector 26, and inputting the second electrical analog signal into the data acquisition module 3;

(2.7) converting the second electrical analog signal into a second electrical digital signal by the data acquisition module 3 and inputting the second electrical digital signal into the upper computer 6;

(2.8) the upper computer 6 carries out calculation processing analysis on the second electric digital signal to obtain the relation between the vibration frequency, the vibration amplitude and the position;

the order of step (1) and step (2) may be reversed.

The above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and it is obvious for a person skilled in the art to modify the specific technical solutions described in the foregoing embodiments or to equally replace some technical features of the embodiments, and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.

Claims

1. The utility model provides a transformer many parameter monitoring system based on distributed optical fiber sensing which characterized in that: the device comprises a temperature measurement component (1), a vibration measurement component (2), a data acquisition module (3), a single mode fiber (4), an optical switch (5) and an upper computer (6);

the temperature measurement assembly (1) comprises a first laser (11), a first circulator (12), a Raman filter (13) and an APD module (14), wherein the output end and the input end of the first laser are sequentially connected, and the output end of the APD module (14) is connected with the first input end of the data acquisition module (3); the first laser (11) is used for generating first pulsed light;

the vibration measurement unit comprises a second laser (21), an acousto-optic modulation module (22), a Raman amplification module (23), a second circulator (24), a 2 x 2 coupler (25) and a balance detector (26), wherein the output and the input of the second laser are sequentially connected, and a second output end of the second laser (21) is connected with a second input end of the 2 x 2 coupler (25); the output end of the balance detector (26) is connected with the second input end of the data acquisition module (3); the second laser (21) is used for generating continuous light, part of the continuous light is modulated into second pulse light through the acousto-optic modulation module (22), and the rest continuous light enters the 2 x 2 coupler (25);

the single-mode optical fiber (4) is wound on a winding and an iron core in the transformer to be monitored, and the single-mode optical fiber (4) is respectively interconnected with the first circulator (12) and the second circulator (24) through the optical switch (5);

a first output end of the data acquisition module (3) is connected with an input end of the first laser (11), and a second output end of the data acquisition module (3) is connected with a second input end of the acousto-optic modulation module (22);

the upper computer (6) is connected with the data acquisition module (3) in an interconnecting way.

2. The distributed optical fiber sensing-based transformer multi-parameter monitoring system according to claim 1, wherein: 80% -95% of continuous light generated by the second laser (21) is input into the acousto-optic modulation module (22), and the rest continuous light is input into the 2 x 2 coupler (25).

3. The distributed optical fiber sensing-based transformer multi-parameter monitoring system according to claim 2, wherein: 90% of the continuous light generated by the second laser (21) is input into the acousto-optic modulation module (22), and the rest of the continuous light is input into the 2 x 2 coupler (25).

4. The distributed optical fiber sensing-based transformer multi-parameter monitoring system according to any one of claims 1 to 3, characterized in that: the continuous light is ultra-narrow linewidth continuous light with the wavelength of 1550 nm.

5. The distributed optical fiber sensing-based transformer multi-parameter monitoring system according to claim 4, wherein: the wavelength of the first pulse light is 1550 nm.