CN108375345B - A Distributed Optical Fiber Sensor Layout Structure - Google Patents

Abstract

The invention discloses an distributed optical fiber sensor arrangement structure which comprises a winding, wherein the outer side of the winding is provided with a optical fiber and a second optical fiber, the optical fiber is fixed on the winding through an installation frame, the second optical fiber is attached to the winding through an insulating tape, the outer side of the second optical fiber is wrapped with a heat insulation layer, the installation frame comprises a shell fixed on the winding, a supporting plate is connected in the shell, the end of the supporting plate is in contact with the winding, the other end of the supporting plate is in contact with a optical fiber, the optical fiber is fixed on the shell through two buckles, the second optical fiber is provided with a plurality of fixed points, and two insulating tapes are fixed on each fixed point in a crossed mode.

Description

A Distributed Optical Fiber Sensor Layout Structure

technical field

The invention relates to the technical field of transformers, in particular to a distributed optical fiber sensor arrangement structure.

Background technique

In the research practice and engineering application of transformer winding deformation detection at home and abroad, the evaluation of the winding deformation state is mainly based on the relative changes of the electrical parameters, physical size, geometric shape and temperature of the transformer winding when the deformation occurs. After a large number of theoretical analysis and experimental research by researchers at home and abroad, the main detection methods of winding deformation are mainly divided into two categories: offline detection and online detection. The mainstream methods of offline detection include short-circuit impedance method, frequency response method and low-voltage pulse method. The mainstream method of online detection is the vibration method.

At present, the detection of winding deformation of power transformers is only carried out during the fault maintenance after the transformer is out of service. It is a passive defense mode after the fault occurs. The planned maintenance of transformers developed later adopts the regular maintenance mode to carry out preventive maintenance on the transformer. Although there is a certain progress in the relative fault maintenance, due to the unknown status information of the transformer in advance, it is inevitable that there will be "insufficient maintenance" and "overhaul" defects, resulting in A lot of human, material and financial resources are wasted. Due to the complex electromagnetic interference on site during live detection, the current live detection transformer winding deformation method still has weak anti-interference ability and poor repeatability, which is greatly affected by factors such as the distribution of the measurement wire, the position of the through-core current transformer, and the length of the ground wire. Deformation fault location and quantitative judgment of deformation degree cannot be performed.

Therefore, it is necessary to seek a safer and more stable detection method to realize live and online monitoring of transformer winding deformation. Distributed optical fiber sensing technology has been successfully applied in many fields. It has been widely used in cables, bridges, coal mines, traffic and disaster warning due to the advantages of small size, light weight, good insulation performance and high sensitivity. However, due to many interference factors in the transformer winding, the measurement accuracy of the optical fiber sensor is not good.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a distributed optical fiber sensor arrangement structure, which can solve the deficiencies of the prior art and improve the detection accuracy of the optical fiber sensor for transformer windings.

In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

A distributed optical fiber sensor arrangement structure includes a winding, a first optical fiber and a second optical fiber are arranged on the outside of the winding, the first optical fiber is fixed on the winding through a mounting frame, the second optical fiber is attached to the winding through an insulating tape, and the first optical fiber is fixed on the winding through a mounting frame. The outer side of the two optical fibers is wrapped with a thermal insulation layer; the mounting frame includes a casing fixed on the winding, a support plate is axially connected to the casing, one end of the support plate is in contact with the winding, the other end of the support plate is in contact with the first optical fiber, and the first optical fiber It is fixed on the casing by two snaps; a plurality of fixing points are arranged on the second optical fiber, and two insulating tapes are cross-fixed on each fixing point.

Preferably, the casing is movably clamped on the winding through a sliding sleeve, and the ratio of the distance between the end of the support plate in contact with the winding and the shaft joint to the distance between the end of the support plate in contact with the first optical fiber and the shaft joint is 1:3.

Preferably, the buckle includes a universal joint fixed on the outer casing, a fixing sleeve is fixed on the universal joint, a rubber inner lining is fixed in the fixing sleeve, the length of the rubber inner lining is greater than the length of the fixing sleeve, and the rubber inner lining is inside The airbag is provided, the edge of the rubber lining is provided with an inclined surface, and the inclined surface is provided with a chute, a support rod is slidably arranged in the chute, the top of the support rod is axially connected with a rubber pad, and the rubber pad is in contact with the first optical fiber.

Preferably, the distance between two adjacent fixing points on the second optical fiber is equal to the distance between two snaps on the same housing.

Preferably, a silicone pad is filled between the insulating tape and the second optical fiber.

The beneficial effects brought by the above technical solutions are: the present invention corrects the temperature of the first optical fiber by arranging the first optical fiber and the second optical fiber, and disposing a heat insulation layer on the second optical fiber. The first optical fiber is fixed on the winding through the mounting frame, and the deformation of the winding is transmitted to the first optical fiber through the support plate, and the leverage of the support plate is used to amplify the deformation of the winding, thereby improving the detection accuracy. The snap-fit structure can reduce the extrusion interference on the first optical fiber, thereby effectively improving the detection accuracy.

Description of drawings

FIG. 1 is a structural diagram of a specific embodiment of the present invention.

FIG. 2 is a structural diagram of a mounting frame in a specific embodiment of the present invention.

FIG. 3 is a structural diagram of one end of the support plate in contact with the first optical fiber in an embodiment of the present invention.

In the figure: 1. Winding; 2. First optical fiber; 3. Second optical fiber; 4. Mounting frame; 5. Insulation layer; 6. Outer shell; 7. Support plate; 8. Buckle; , sliding sleeve; 11, universal joint; 12, fixed sleeve; 13, rubber lining; 14, air bag; 15, inclined surface; 16, chute; 17, support rod; 18, rubber pad; 19, silicone pad; 20. Skateboard; 21. Arc shrapnel; 22. Spring body.

Detailed ways

The standard parts used in the present invention can be purchased from the market, the special-shaped parts can be customized according to the description in the description and the drawings, and the specific connection methods of each part are all mature bolts, rivets, welding in the prior art. , pasting and other conventional means will not be described in detail here.

1-3, a specific embodiment of the present invention includes a winding 1, a first optical fiber 2 and a second optical fiber 3 are arranged on the outside of the winding 1, the first optical fiber 2 is fixed on the winding 1 by a mounting frame 4, and the second optical fiber is 3. It is attached to the winding 1 through insulating tape, and the outer side of the second optical fiber 3 is wrapped with a thermal insulation layer 5; One end is in contact with the winding 1, the other end of the support plate 7 is in contact with the first optical fiber 2, and the first optical fiber 2 is fixed on the casing 6 through two buckles 8; the second optical fiber 3 is provided with several fixed points, each Two insulating tapes 9 are fixed crosswise on the fixing point. The casing 6 is movably clamped on the winding 1 through the sliding sleeve 10, and the ratio between the distance between the end of the support plate 7 in contact with the winding 1 and the shaft joint and the distance between the end of the support plate 7 in contact with the first optical fiber 2 and the shaft joint is 1: 3. The buckle 8 includes a universal joint 11 fixed on the casing 6, a fixing sleeve 12 is fixed on the universal joint 11, a rubber inner lining 13 is fixed in the fixing sleeve 12, and the length of the rubber inner lining 13 is greater than the length of the fixing sleeve 12, An airbag 14 is arranged in the rubber inner lining 13, an inclined surface 15 is arranged on the edge of the rubber inner lining 13, a chute 16 is arranged on the inclined surface 15, and a support rod 17 is slidably arranged in the chute 16, and the top of the support rod 17 is axially connected with a The rubber pad 18 is in contact with the first optical fiber 2 . The distance between two adjacent fixing points on the second optical fiber 3 is equal to the distance between the two clips 8 on the same housing 6 . A silicone pad 19 is filled between the insulating tape 9 and the second optical fiber 3 .

In addition, a movable sliding plate 20 is arranged at the end of the support plate 7 in contact with the first optical fiber 2 , and two arc-shaped elastic pieces 21 are symmetrically arranged on the sliding plate 20 . The sliding plate 20 can adjust the relative position of the arc-shaped elastic piece 21 and the support plate 7 according to the contact angle between the support plate 7 and the first optical fiber 2 , so as to ensure sufficient contact between the arc-shaped elastic piece 21 and the first optical fiber 2 . The arc-shaped elastic piece 21 can expand the pressure application range on the first optical fiber 2, so as to avoid excessive deformation of the optical fiber caused by a single point of force. The sliding plate 20 and the support plate 7 are connected by a spring body 22, and the spring body 22 can provide displacement damping force, so as to avoid the support angle error caused by the excessive displacement of the sliding plate 20.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the descriptions in the above-mentioned embodiments and the description are only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and modifications fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (5)

1. A distributed optical fiber sensor arrangement structure, comprising a winding (1), characterized in that: a first optical fiber (2) and a second optical fiber (3) are arranged on the outside of the winding (1), and the first optical fiber (2) It is fixed on the winding (1) by the mounting frame (4), the second optical fiber (3) is attached to the winding (1) by insulating tape, and the outer side of the second optical fiber (3) is wrapped with a thermal insulation layer (5); The frame (4) includes an outer casing (6) fixed on the winding (1), a support plate (7) is axially connected to the inner casing (6), one end of the supporting plate (7) is in contact with the winding (1), and the supporting plate (7) ) is in contact with the first optical fiber (2), and the first optical fiber (2) is fixed on the casing (6) through two buckles (8); the second optical fiber (3) is provided with several fixing points, each Two insulating tapes (9) are cross-fixed on each fixing point. 2. The distributed optical fiber sensor arrangement structure according to claim 1, characterized in that: the casing (6) is movably clamped on the winding (1) through the sliding sleeve (10), and the support plate (7) is connected to the winding (1). 1) The ratio between the distance from the contact end to the shaft joint and the distance from the contact end of the support plate (7) to the first optical fiber (2) to the shaft joint is 1:3. 3. The distributed optical fiber sensor arrangement structure according to claim 2, characterized in that: the buckle (8) comprises a universal joint (11) fixed on the casing (6), and the universal joint (11) A fixing sleeve (12) is fixed, a rubber inner lining (13) is fixed in the fixing sleeve (12), the length of the rubber inner lining (13) is greater than the length of the fixing sleeve (12), and an airbag is arranged in the rubber inner lining (13) (14), the edge of the rubber lining (13) is provided with an inclined surface (15), the inclined surface (15) is provided with a chute (16), and a support rod (17) is slidably arranged in the chute (16) to support A rubber pad (18) is axially connected to the top of the rod (17), and the rubber pad (18) is in contact with the first optical fiber (2). 4. The distributed optical fiber sensor arrangement structure according to claim 1, wherein the distance between the two adjacent fixed points on the second optical fiber (3) is the same as the distance between the two cards on the same housing (6). The distance between the buckles (8) is equal. 5 . The distributed optical fiber sensor arrangement structure according to claim 4 , wherein a silicone pad ( 19 ) is filled between the insulating tape ( 9 ) and the second optical fiber ( 3 ). 6 .

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