CN212748027U

CN212748027U - GIL post insulator burst positioning device

Info

Publication number: CN212748027U
Application number: CN202021495807.4U
Authority: CN
Inventors: 丛浩熹; 韩冬; 李庆民
Original assignee: North China Electric Power University
Current assignee: North China Electric Power University
Priority date: 2020-07-27
Filing date: 2020-07-27
Publication date: 2021-03-19
Anticipated expiration: 2030-07-27

Abstract

A GIL post insulator burst positioning device belongs to the technical field of GIL state monitoring and fault diagnosis. The device comprises a broadband light source, an optical isolator, an optical coupler, a fiber grating vibration sensor, an optical fiber vibration sensor demodulator, data acquisition and processing equipment and control equipment; each grating vibration sensor is adhered to the outer side of the GIL aluminum alloy shell by epoxy resin quick-drying glue and is just below each supporting insulator; the broadband light source and other equipment are connected through optical fibers. The utility model has convenient installation, simple structure, and good economical efficiency while meeting the requirement; the adoption of the grating vibration sensor can accurately position the burst post insulator, and has important significance for ensuring the safe and reliable operation of the GIL equipment.

Description

GIL post insulator burst positioning device

Technical Field

The utility model relates to a be applied to device that GIL equipment post insulator explodes and splits location belongs to GIL equipment fault location technical field.

Background

The gas insulated transmission line (GIL) has strict processing technology and advanced technology. It uses a metal shell to enclose a conductive rod, through SF₆Or SF₆The mixed gas and the post insulator are insulated, the shell and the conducting rod are coaxially arranged to transmit electric energy, and the gas-solid mixed gas transmission device has the advantages of large transmission capacity, small environmental influence and unit lossThe device has the advantages of low operation reliability, high operation reliability, land occupation saving and the like, and is widely applied to electric energy output occasions such as hydropower stations and nuclear power stations. When the air bubble or air gap defect which is not detected in the existing standard occurs in the insulator, the insulator is gradually degraded under the action of an electric field, and finally the insulator is broken through and cracked, so that the reliability of power supply is seriously influenced. The method realizes the positioning of the explosion position of the insulator, eliminates the fault in time and has important significance on the safe and reliable operation of the GIL.

At present, the method for positioning the cracking position of the GIL post insulator applied in the field is mainly to manually check the appearance of equipment at a fault interval, and if no abnormity occurs, the appearance of the equipment at the fault interval is checked₆And (4) testing the gas micro-water and the components, and indicating that the part has a fault when the gas components are abnormal. This method has certain disadvantages: the workload of manually checking the appearance of primary equipment is large, and the visible influence on the GIL shell can not be caused when the insulator is cracked; in addition, the method for testing the components of the air chamber has low accuracy, and the cracked insulator cannot be accurately positioned. In summary, few researches are conducted on the method for positioning the cracking of the GIL post insulator, and the cracking position of the GIL post insulator cannot be determined effectively. Therefore, if a device which is generally applied to positioning of GIL burst insulators can be provided, the device has great significance for improving the safety and reliability of GIL equipment.

Disclosure of Invention

The utility model aims at overcoming above-mentioned prior art not enough, providing a device that can generally be applied to GIL and explode and split post insulator location, the vibration that produces when utilizing grating vibration sensor perception insulator to explode and split through grating vibration sensor demodulation equipment, realizes accurate positioning.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a GIL post insulator burst positioning device comprises a broadband light source 1, an optical isolator 2, an optical coupler 3, a fiber grating vibration sensor 5, an optical fiber 6, a fiber vibration sensor demodulator 7, data acquisition and processing equipment 8 and control equipment 9.

The installation position of the grating vibration sensor needs to install the sensor on a GIL aluminum alloy shell right below each insulator, when the post insulator is cracked, the sensor can accurately sense the vibration generated by the cracking, the vibration condition is reflected on the central wavelength of the reflected light of the post insulator, the sensor is adhered to the aluminum alloy shell through epoxy resin quick-drying glue, and the grating vibration sensors on the same line are connected in series through optical fibers;

the broadband light source, the optical coupler and each grating vibration sensor are required to be connected in sequence, and then the optical coupler is connected with the optical fiber vibration sensor demodulator, the data acquisition and processing equipment and the control equipment; send broadband light through the broadband light source, through optical isolator and optical coupler, the light that possesses certain condition when light reachs grating vibration sensor can reflect, remaining light can continue to propagate, when vibration sensor produces the change because GIL post insulator explodes the vibration of splitting, the central wavelength of its reverberation can change, the light of reverberation gets into the photodemodulator through optical coupler, through the demodulation to the reverberation, can analyze and calculate the change volume of light central wavelength, thereby carry out the location of exploding the position.

The utility model has the advantages that: simple structure, simple to operate effectively avoids sealed problem on the basis that does not change the original structure of GIL, can carry out the accurate positioning to exploding the insulator, has the great meaning to improving GIL transmission of electricity reliability.

Drawings

FIG. 1 is a schematic view of the overall structure of a GIL post insulator burst locating device;

in the figure: 1-a broadband light source; 2-an optical isolator; 3-an optical coupler; 4-post insulators; 5-a grating fiber vibration sensor; 6-an optical fiber; 7-optical fiber vibration sensor demodulator, 8-data acquisition and processing equipment; 9-control equipment.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of the overall structure of a GIL post insulator burst locating device, which is a GIL post insulator burst locating device and comprises a broadband light source 1, an optical isolator 2, an optical coupler 3, a fiber grating vibration sensor 5, a fiber vibration sensor demodulator 7, data acquisition and processing equipment 8 and control equipment 9.

As shown in fig. 1, firstly, the grating vibration sensor is adhered to the GIL aluminum alloy shell right below each post insulator 4 through epoxy resin quick-drying glue, and the sensors are sequentially connected in series through optical fibers; secondly, arranging a broadband light source device which is sequentially connected with an optical isolator and an optical coupler through optical fibers; thirdly, leading out an optical fiber from the first sensor to be connected with the optical coupler; and finally, leading out an optical fiber from the optical coupler to be connected with optical demodulation equipment, and sequentially connecting the optical modulation equipment with data acquisition and processing equipment and control equipment. Thus, the connection of the device is completed.

Since the central wavelength of the reflected light is related to the grating period and the effective refractive index of the fiber core, which change with the change of the external temperature and strain, the central wavelength of the reflected light is changed by the high temperature and vibration generated when the post insulator is cracked.

A broadband light source emits a beam of broadband light, the broadband light can sequentially pass through an optical isolator and an optical coupler to irradiate on a grating of a grating sensor, the light with specific conditions can be reflected, and the rest light penetrates through the grating and continues to be transmitted to the next grating sensor until the rest light passes through a sensor below the last protected post insulator. When the post insulators are not cracked, each grating vibration sensor can reflect light with a specific wavelength back, the reflected light enters the optical coupler and finally reaches the optical demodulation equipment, the optical demodulation equipment demodulates the reflected light and then transmits information to the data acquisition and processing equipment and the control equipment, and the control equipment can judge that the post insulators are not abnormal; when the post insulator is cracked, vibration and high temperature generated by the cracking can cause the strain change of the fiber bragg grating, the strain can cause the central wavelength of reflected light to change, the reflected light with the changed central wavelength is transmitted to demodulation equipment of a grating vibration sensor through an optical coupler, the optical demodulation equipment demodulates reflected light signals, and data acquisition and processing equipment and control equipment analyze and calculate the change amount of the central wavelength of the reflected light corresponding to the sensor, so that the specific position of the post insulator is judged. Therefore, the real-time distributed monitoring of the states of the insulators is achieved. Because the equipment has high sensitivity, a certain preset value is selected during actual use, and misoperation of the equipment is prevented.

The utility model discloses simple structure, simple to operate, the volume is moderate, economical and practical effectively avoids sealed problem on the basis that does not change the original structure of GIL, can carry out the accurate positioning to exploding the split insulator, economical and practical has great meaning to improving GIL transmission of electricity reliability.

Claims

1. A GIL post insulator burst positioning device is characterized by comprising a broadband light source (1), an optical isolator (2), an optical coupler (3), a fiber grating vibration sensor (5), an optical fiber (6), a fiber vibration sensor demodulator (7), data acquisition and processing equipment (8) and control equipment (9);

the fiber bragg grating vibration sensor is arranged on the GIL aluminum alloy shell right below each post insulator (4), when the post insulators are cracked, the sensor can accurately sense vibration generated by cracking, the vibration condition is reflected to the central wavelength of reflected light of the post insulators, the sensor is adhered to the aluminum alloy shell through epoxy resin quick-drying glue, and grating vibration sensors on the same line are connected in series through optical fibers;

broadband light source, optical isolator, optical coupler, each grating vibration sensor are connected in proper order, optical fiber vibration sensor demodulator, data acquisition and processing equipment, controlgear are connected in proper order, optical coupler and optical fiber vibration sensor demodulator are connected, and the central wavelength that every fiber grating vibration sensor write in is different.